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American Magnetics 430, Installation, Operation And Maintenance Instructions

The Philips 430 offers unparalleled performance and versatility, and to make the most of your device, we provide a comprehensive User Manual. Download it for free from our website and unlock the full potential of your Philips 430, ensuring a seamless user experience.

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Summary of Contents for 430

Page 1: ...ak Ridge TN 37831 2509 Tel 865 482 1056 Fax 865 482 5472 Rev 9 July 2017 MODEL 430 POWER SUPPLY PROGRAMMER INCLUDING HIGH STABILITY OPTION MULTI AXIS APPLICATIONS INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS EXCELLENCE IN MAGNETICS AND CRYOGENICS ...

Page 2: ......

Page 3: ...ii Safety Summary xiv Minimum Recommended Safety Equipment xiv Safety Legend xv Introduction 1 Model 430 Programmer Features 1 Digitally Controlled 1 Superior Resolution and Stability 1 High Stability Option 2 Intuitive Human Interface Design 2 Flexibility 2 Standard Remote Interfaces 2 Programmable Safety Features 2 Condition Based Magnet Auto Rampdown 3 Model 430 Front Panel Layout 4 Model 430 R...

Page 4: ... Systems 37 General 37 Load Cables 37 Instrumentation Cables 37 Standard non recondensing Helium based 2 Axis System Signal Interconnects 38 Standard non recondensing Helium based 3 Axis System Signal Interconnects 39 Recondensing Helium based 2 Axis System Signal Interconnects 40 Recondensing Helium based 3 Axis System Signal Interconnects 41 Cryogen Free 2 Axis System Signal Interconnects 42 Cry...

Page 5: ...nus 62 Ramp Rate Shift 1 63 Voltage Limit Shift 2 66 Reset Quench Shift 3 67 Increment Field Shift 4 67 Field Current Shift 5 67 Decrement Field Shift 6 68 Field Units Shift 7 68 Persistent Switch Heater Current Shift 8 68 Stability Shift 9 69 Vs Vm Shift 0 69 Volt Meter Shift 69 Fine Adjust Shift 69 Shift Persist Switch Control 69 LED Indicators 70 Power on Indicator 70 Magnet Status Indicators 7...

Page 6: ...cedure for Exiting Persistent Mode 117 Toggling the State of the Persistent Switch Heater 120 Ramping Functions Example 121 Quench Detection 123 Quench Detection Method 123 External Quench Detection 124 Disabling Internal Quench Detection 124 External Rampdown 125 External Rampdown while in Persistent Mode 126 External Rampdown while not in Persistent Mode 127 Summary of Limits and Default Setting...

Page 7: ... Misc Setup Configuration Commands and Queries 160 Lock Commands and Queries 161 Net Setup Configuration Commands and Queries 167 Ramp Target Rate Configuration Commands and Queries 167 Measurement Commands and Queries 169 Ramping State Commands and Queries 170 Switch Heater Command and Query 171 Quench State Commands and Queries 172 Rampdown State Commands and Queries 173 Trigger Functions 176 Er...

Page 8: ...tor 203 RS 232 Connector 204 Abbreviations and Acronyms used in this Manual 205 Remote Computer Communication with the Model 430 208 Communication via RS 232 208 Communication via Ethernet 210 Upgrading the Model 430 Firmware via FTP 213 Hardware and Software Requirements 213 Preparation 213 Upload Procedure using FileZilla 214 Alternative Upload Procedure using Windows FTP 220 Upgrading the Model...

Page 9: ...s the reader to the functions and characteristics of the Model 430 Power Supply Programmer It provides illustrations of the front and rear panel layouts as well as documenting the performance specifications Additional information is provided in the form of system circuit diagrams Installation describes how the Model 430 Power Supply Programmer is unpacked and installed in conjunction with ancillar...

Page 10: ...plies or power supply systems AMI Model 12100PS switching power supply 12 V 100 A AMI Model 12200PS switching power supply 12 V 200 A AMI Model 7 5 140PS switching power supply 7 5 V 140 A AMI Model 10100PS switching power supply 10 V 100 A AMI Model 10200PS switching power supply 10 V 200 A AMI Model 08150PS switching power supply 1200 Watt AMI Model 03300PS multiple Model 08150PS w Energy Absorb...

Page 11: ...entially extreme suffocation hazards since a small amount of liquid will vaporize and yield a very large volume of oxygen displacing gas Always ensure the location where the cryogen is used is well ventilated Breathing air with insufficient oxygen content may cause unconsciousness without warning If a space is suspect purge the space completely with air and test before entry If this is not possibl...

Page 12: ...iner should be cooled gradually to prevent damage by thermal shock The liquid should be poured slowly to avoid spattering due to rapid boil off The receiving vessel should be vented during the transfer MATERIAL SAFETY AT CRYOGENIC TEMPERATURES Introduction of a substance at or near room temperature into a cryogenic liquid should be done with great caution There may be a violent gas boil off and a ...

Page 13: ... pressure relief valves of sufficient capacity so as to limit the pressure transients within the container in order to prevent damage to the vessel Operating a superconducting magnet in a cryostat without properly sized relief mechanisms or disabled relief mechanism is unsafe for the operator as well as for the equipment If there is any doubt as to the sufficiency of the pressure relief system con...

Page 14: ...of large magnetic fields Items such as watches tape recorders and cameras may be magnetized and irreparably damaged if exposed to magnetic fields Information encoded magnetically on credit cards and magnetic tape including computer floppy discs may be irreversibly corrupted Electrical transformers may become magnetically saturated Safety characteristics of equipment may also be affected SAFETY SUM...

Page 15: ...rnating Current Refer to IEC 417 No 5032 Off Supply Refer to IEC 417 No 5008 On Supply Refer to IEC 417 No 5007 WARNING The Warning sign denotes a hazard It calls attention to a procedure or practice which if not correctly adhered to could result in personal injury Do not proceed beyond a Warning sign until the indicated conditions are fully understood and met CAUTION The Caution sign denotes a ha...

Page 16: ...XVI REV 9 AMERICAN MAGNETICS INC FOREWORD SAFETY SUMMARY ...

Page 17: ... by a microcomputer which per forms all analog data conversion display keypad functions communica tions I O generation of analog programming signals for the external power supply and control law computations The Model 430 Program mer incorporates digital signal processing DSP functions that provide for accurate control low drift and flexibility of use SUPERIOR RESOLUTION AND STABILITY The Model 43...

Page 18: ...e as a two or four quadrant power supply system which is able to both supply and remove electrical energy from the superconducting magnet system The Model 430 Programmer is engineered to be compatible with most power supplies with remote analog programming capabilities From simple single quadrant supplies to more elaborate four quadrant units the Model 430 Power Supply Programmer is user configura...

Page 19: ...hange any non critical unlocked parameters CONDITION BASED MAGNET AUTO RAMPDOWN The Model 430 Programmer can be connected to an AMI Model 1700 Liquid Level Instrument with the LHe measurement option to allow automatic rampdown of the magnet even in persistent mode should the liquid helium LHe level drop to a preset level This feature ensures the magnet will be protected and not experience a quench...

Page 20: ...TCH CONTROL RAMP TO ZERO FIELD AT TARGET MAGNET IN PERSISTENT MODE MAGNET QUENCH CURRENT LEADS ENERGIZED American Magnetics Inc Model 430 Power Supply Programmer Model 430 Front Panel Description 1 Power Indicator LED 8 Fine Adjust Knob 2 280 x 16 Dot Graphic VF Display 9 Persistent Switch Heater Control Key 3 Shift Indicator LED 10 Target Field Setpoint Key 4 Shift Key 11 Ramp Pause Switch 5 4 Ro...

Page 21: ...nt Shunt Terminals 6 Aux Inputs 15 pin Female HD D sub Connector 2 Ethernet RJ 45 Connector 7 Dual Auxiliary LHe Level Temp 9 pin Male D sub Connectors 3 RS 232 9 pin Male D sub Connector 8 Dual Magnet Station 25 pin Female D sub Connectors 4 Quench I O 15 pin Male D sub Connector 9 Input Power IEC 60320 C14 Male Connector 5 Program Out 15 pin Male D sub Connector ...

Page 22: ...Female D sub Connector 6 Aux Inputs 15 pin Female HD D sub Connector 2 Ethernet RJ 45 Connector 7 Dual Auxiliary LHe Level Temp 9 pin Male D sub Connectors 3 RS 232 9 pin Male D sub Connector 8 Dual Magnet Station 25 pin Female D sub Connectors 4 Quench I O 15 pin Male D sub Connector 9 Input Power IEC 60320 C14 Male Connector 5 Program Out 15 pin Male D sub Connector ...

Page 23: ...d Magnet Current Control Temperature Coefficient 0 01 of Imax C Stability w internal shunt w High Stability Option With standard internal shunt better than 0 002 of Imax after 20 minutes at desired current With High Stability Option zero flux current transducer better than 0 001 of Imax after 10 minutes at desired current Noise Floor Relative to Imax 127 dB w internal shunt 138 dB with High Stabil...

Page 24: ... CR2032 Lithium coin cell Physical Dimensions 89 mm H x 483 mm W x 191 mm D 3 5 H x 19 W x 10 75 D Weight 8 5 lbm 3 9 kg Terminal Torque Limit 48 in lb 5 4 N m Environmental Ambient Temperature Operating 0 C to 50 C 32 F to 122 F Nonoperating 20 C to 70 C 4 F to 158 F Relative Humidity 0 to 95 non condensing Standards EMI EMC Standards EN 61000 4 2 EN 61000 4 3 EN 61000 4 4 EN 61000 4 5 EN 61000 4...

Page 25: ...tability precision zero flux current measurement device for additional cost This is termed the High Stability option for AMI power supply systems SINGLE QUADRANT OPERATION The simplest form of a Programmer Power Supply system is the single quadrant system as illustrated in the figure at the top of the following page The system is composed of a Model 430 Programmer unipolar power supply and superco...

Page 26: ...e times involved DUAL QUADRANT OPERATION In the Bipolar Power Supply System an energy absorber is added in series with the unipolar supply this allows stored magnetic energy to be converted to thermal energy thereby allowing much faster magnetic field reduction This corresponds to operation in quadrants N and Q referring to the figure on page 9 The disadvantage to this type of system is that energ...

Page 27: ... magnetic energy sink returns a significant portion of the power to the AC line instead of dissipating it as heat Disadvantages of the four quadrant system include somewhat increased cost of the power supply over unipolar power supplies or bipolar power supply systems and added complexity in protecting the power supply in the event of AC power loss or magnet quenching Nonetheless modern four quadr...

Page 28: ...12 REV 9 AMERICAN MAGNETICS INC INTRODUCTION OPERATING CHARACTERISTICS ...

Page 29: ...ss than sufficient to carry the rated current of the power circuit the equipment should be disconnected from power labeled as unsafe and removed from place of operation WARNING Do not operate this equipment in the presence of flammable gases Doing so could result in a life threatening explosion WARNING Do not modify this equipment in any way If component replacement is required return the equipmen...

Page 30: ...o not remove the cabinet feet and then reinsert the original screws Doing so could present a severe life threatening electrical hazard If the cabinet feet are removed do not reinstall the screws If screws must be installed where the feet were mounted replace the original screws with screws not to exceed 1 4 inch in length If the Model 430 Programmer is to be rack mounted install it in a 19 wide in...

Page 31: ...pment rear panels If the operating voltage is correct plug the line cords into the power entry connectors and then into the appropriate facility power receptacles CHANGING THE MODEL 430 PROGRAMMER OPERATING VOLTAGE WARNING The following procedure is to be performed only when the Model 430 Programmer is completely de energized by removing the power cord from the power receptacle Failure to do so co...

Page 32: ... and wiring harnesses will have been shipped with the system Since many different configurations are possible use the system interconnection diagram that most closely matches your system this is usually determined by the operating characteristics of the power supply For maximum immunity to AC line noise ensure that the chassis of the Model 430 Programmer has a direct low impedance electrical conne...

Page 33: ...em The main instrumentation cable connecting the magnet support stand to one of the Model 430 Programmer MAGNET STATION connectors contains all the instrumentation and control connections needed to control and monitor the magnet The signals in this cable which are required to monitor LHe level and temperatures are also presented at the LHe Level Temp Connectors Refer to the Appendix for pin outs o...

Page 34: ...tective diode may cause serious injury to personnel and damage to the power supply under loss of AC power conditions a Connect the protective diode across the output terminals of the power supply anode to the negative terminal and the cathode to the positive terminal b Connect the positive power supply terminal ì to the positive magnet current lead î c Connect the negative magnet current lead ï to...

Page 35: ...ƵƉĞƌĐŽŶĚƵĐƚŝŶŐ DĂŐŶĞƚ DŽĚĞů ϰϯϬ ZĞĂƌ WĂŶĞů ϭ Ϯ ϯ ϰ ϱ ϲ ϴ ϵ D DŽĚĞů ϭϳϬϬ ZĞĂƌ WĂŶĞů DŽĚĞů ϬϴϭϱϬW hŶŝƉŽůĂƌ ƵƉƉůLJ ZĞĂƌ WĂŶĞů ϳ ϭϬ ϭϭ ϭϮ ϭϯ ϭϰ ϭϱ AMERICAN MAGNETICS INC OAK RIDG E TN USA AUX I O RS 232 ETHERNET VALVE CONTROL O T LHe 100 240Vac 50 60 Hz 200 VA Unipolar System Interconnections ...

Page 36: ... the Model 1700 Liquid Level Instrument LHe connector and or temperature instrument u Refer to page 195 i Optional Install an instrumentation cable between the QUENCH I O connector äon the rear of the Model 430 Programmer and Aux I O connector on the rear panel of the Model 1700 Liquid Level Instrument í Refer to page 200 j Connect each device line cord from the respective device to the appropriat...

Page 37: ...ve diode is installed across the output terminals of the power supply with the anode at the negative terminal and the cathode at the positive terminal Removal or omission of this protective diode may cause serious injury to personnel and damage to the power supply under loss of AC power conditions a Connect the protective diode between the output terminals of the power supply anode to the negative...

Page 38: ...WĂŶĞů ϭ Ϯ ϯ ϰ ϱ ϲ ϴ ϵ D DŽĚĞů ϭϳϬϬ ZĞĂƌ WĂŶĞů DŽĚĞů ϬϴϭϱϬW hŶŝƉŽůĂƌ ƵƉƉůLJ ZĞĂƌ WĂŶĞů ϳ ϭϬ ϭϭ ϭϮ ϭϱ ϭϯ ϭϰ ϭϲ DŽĚĞů ϲϬϭ ŶĞƌŐLJ ďƐŽƌďĞƌ ZĞĂƌ WĂŶĞů ϭϳ Ϯϭ AMERICAN MAGNETICS INC OAK RIDG E TN USA AUX I O RS 232 ETHERNET VALVE CONTROL O T LHe 100 240Vac 50 60 Hz 200 VA Model 05100PS 05120PS 430 601 Bipolar System Interconnections ...

Page 39: ...n one of the LHe LEVEL TEMP connectors çon the rear of the Model 430 Programmer and the Model 1700 Liquid Level Instrument LHe connector and or temperature instrument â Refer to page 195 j Optional Install an instrumentation cable between the QUENCH I O connector ãon the rear of the Model 430 Programmer and Aux I O connector ä on the rear panel of the Model 1700 Liquid Level Instrument Refer to pa...

Page 40: ...efer to specifications table on page 8 for torque limits Overtightening can result in damage to the terminals WARNING Ensure the protective diode is installed across the output terminals of the power supply with the anode at the negative terminal and the cathode at the positive terminal Removal or omission of this protective diode may cause serious injury to personnel and damage to the power suppl...

Page 41: ...Ğƌ ZĞĂƌ WĂŶĞů DŽĚĞů ϬϴϭϱϬW hŶŝƉŽůĂƌ ƵƉƉůLJ н ͲͿ ϬϴϭϱϬW нͿ ϬϴϭϱϬW ͲͿ dŽ ĂĚĚŝƚŝŽŶĂů ƉĂƌĂůůĞů DŽĚĞů ϲϬϭ ŶĞƌŐLJ ďƐŽƌďĞƌƐ ƚŽƚĂů ƵŶŝƚƐ ŝŶĐůƵĚŝŶŐ ƉƌŝŵĂƌLJ ŽŶĞ ƉĞƌ ϭϬϬ Žƌ ϭϮϬ ƐLJƐƚĞŵ ƌĂƚŝŶŐͿ dŽ ĞĂĐŚ ƐůĂǀĞ ϬϴϭϱϬW ƵŶŝƚ ϭϰ ϭϱ ϭϳ ϭϴ dŽ ĞĂĐŚ ƐůĂǀĞ ϬϴϭϱϬW ƵŶŝƚ ŶĂůŽŐ KͿ ϭϲ ϭϵ ϮϬ Ϯϭ AMERICAN MAGNETICS INC OAK RIDG E TN USA AUX I O RS 232 ETHERNET VALVE CONTROL O T LHe 100 240Vac 50 60 Hz 200 VA High Stability Bipolar...

Page 42: ...k Install an instrumentation cable between the magnet support stand top plate connector s and one of the MAGNET STATION connectors í on the rear of the Model 430 Programmer l Optional Install an instrumentation cable between one of the LHe TEMP connectors uon the rear of the Model 430 Programmer and the Model 1700 Liquid Level Instrument LHe connector and or temperature instrument t Refer to page ...

Page 43: ...NC INSTALLATION SYSTEM INTERCONNECTS SINGLE AXIS SYSTEMS p Remote communications via Ethernet and or RS 232 can be accomplished by connecting suitable cabling to the Model 430 Programmer rear panel ETHERNET and or RS 232 connectors ...

Page 44: ...The use of locking hardware is recommended for all high current connections CAUTION Do not overtighten the hardware on the interconnection terminals refer to specifications table on page 8 for torque limits Overtightening can result in damage to the terminals b Connect the negative magnet current lead ï to the positive resistive shunt terminal ñon the back of the Model 430 Programmer c Connect the...

Page 45: ...EMS ƵƉĞƌĐŽŶĚƵĐƚŝŶŐ DĂŐŶĞƚ DŽĚĞů ϰϯϬ ZĞĂƌ WĂŶĞů ϭ Ϯ ϯ ϰ ϱ ϲ ϴ ϵ D DŽĚĞů ϭϳϬϬ ZĞĂƌ WĂŶĞů ϳ D DŽĚĞů ϰYϬϲϭϮϱ ƵƉƉůLJ ϭϬ ϭϭ ϭϮ ϭϯ ϭϰ AMERICAN MAGNETICS INC OAK RIDG E TN USA AUX I O RS 232 ETHERNET VALVE CONTROL O T LHe 100 240Vac 50 60 Hz 200 VA Model 4Q06125PS 430 System Interconnections ...

Page 46: ...cable between the QUENCH I O connector âon the rear of the Model 430 Programmer and Aux I O connector í on the rear panel of the Model 1700 Liquid Level Instrument Refer to page 200 h Connect each device line cord from the respective device to the appropriate power receptacle i Remote communications via Ethernet and or RS 232 can be accomplished by connecting suitable cabling to the Model 430 Prog...

Page 47: ...to specifications table on page 8 for torque limits Overtightening can result in damage to the terminals NOTE If routing the magnet cable from power supply OUTPUT through the current transducer CT the current direction arrow on the CT must point toward the magnet a Connect the OUTPUT power supply terminal ì and route it through the zero flux current transducer see note Connect the other end to the...

Page 48: ...ŝŶŐ DĂŐŶĞƚ DŽĚĞů ϰϯϬ ZĞĂƌ WĂŶĞů ϭ Ϯ ϯ ϰ ϱ ϳ ϴ D DŽĚĞů ϭϳϬϬ ZĞĂƌ WĂŶĞů ϲ DŽĚĞů ϰYϬϲϭϮϱ WŽǁĞƌ ƵƉƉůLJ ϵ ϭϬ ϭϭ ϭϮ ϭϯ ƵƌƌĞŶƚ dƌĂŶƐĚƵĐĞƌ AMERICAN MAGNETICS INC OAK RIDG E TN USA AUX I O RS 232 ETHERNET VALVE CONTROL O T LHe 100 240Vac 50 60 Hz 200 VA Model 4Q06125PS 430 High Stability System Interconnects ...

Page 49: ... the QUENCH I O connector äon the rear of the Model 430 Programmer and Aux I O connector â on the rear panel of the Model 1700 Liquid Level Instrument Refer to page 200 h Connect each device line cord from the respective device to the appropriate power receptacle i Remote communications via Ethernet and or RS 232 can be accomplished by connecting suitable cabling to the Model 430 Programmer rear p...

Page 50: ...ertightening can result in damage to the terminals Referring to the diagram on page 35 ensure the cabling is connected in the following manner a Connect the OUT power supply terminal ì to the positive magnet current lead î b Install three jumpers on the terminal board back of power supply S OUT to OUT GRD NET to COM COM to S COM c Connect the negative magnet current lead ï to the positive resistiv...

Page 51: ...Ϭ ϭϭ ϭϮ ϭϯ ϭϱ ϭϰ 92 7 3 2 855 17 02 92 7 21752 32 5 23 5 7 21 32 5 6833 03 5 9 o 9 o 855 17 21752 21 2 21 2 32 5 21 2 855 17 1387 5 027 92 7 0 76 855 17 0 76 5281 6 16 20021 287387 6 16 9 o o 9 o o 92 7 352 5 00 1 1387 AMERICAN MAGNETICS INC OAK RIDG E TN USA AUX I O RS 232 ETHERNET VALVE CONTROL O T LHe 100 240Vac 50 60 Hz 200 VA 6 287 287 5 5 1 7 20 6 20 ϭ ϲ Model 4Q1005PS 430 Low Current System...

Page 52: ...I O connector â on the rear panel of the Model 1700 Liquid Level Instrument Refer to page 200 i Connect each device line cord from the respective device to the appropriate power receptacle j Remote communications via Ethernet and or RS 232 can be accomplished by connecting suitable cabling to the Model 430 Programmer rear panel ETHERNET and or RS 232 connectors k On the power supply front panel se...

Page 53: ... as depicted in the diagram on page 32 the current transducer is also duplicated for each axis along with the load cables CAUTION For multi axis systems ensure the power supply and magnet load cables are connected only to the equipment associated with the axis for which the cable is labeled INSTRUMENTATION CABLES Instruments such as level temperature pressure etc that are part of the system are ty...

Page 54: ...ĂůĞͿ ĨƌŽŵ DŽĚĞů ϭϳϬϬ ŝƋƵŝĚ ĞůŝƵŵ ĞǀĞů ŶƐƚƌƵŵĞŶƚ hy K ĐŽŶŶĞĐƚŽƌ ƚŽ ĞĂĐŚ DŽĚĞů ϰϯϬ Yh E K ĐŽŶŶĞĐƚŽƌ ì ĂďůĞ ĨƌŽŵ ƚŚĞ DŽĚĞů ϭϳϬϬ ŝƋƵŝĚ ĞůŝƵŵ ĞǀĞů ŶƐƚƌƵŵĞŶƚ E KZ ĐŽŶŶĞĐƚŽƌ ƚŽ ŽŶĞ ŽĨ ƚŚĞ Ͳ džŝƐ DŽĚĞů ϰϯϬ Ğ s d DW ĐŽŶŶĞĐƚŽƌƐ ï DĂŐŶĞƚ ƚĂƚŝŽŶ ĐĂďůĞ ĨƌŽŵ ƌLJŽƐƚĂƚ ñ DĂŐŶĞƚ ƚĂƚŝŽŶ zͲƚŽͲ ŝŶƚĞƌĐŽŶŶĞĐƚ ĐĂďůĞ AMERICAN MAGNETICS INC OAKRIDGE TN USA AUXI O RS 232 ETHERNET VALVECONTROL O T LHe 100 240Vac 50 60Hz 200VA...

Page 55: ...ĂůĞ ƐƉůŝƚ ƚŽ ƚŚƌĞĞ ϵͲƉŝŶ ŵĂůĞͿ ĨƌŽŵ DŽĚĞů ϭϳϬϬ ŝƋƵŝĚ ĞůŝƵŵ ĞǀĞů ŶƐƚƌƵŵĞŶƚ hy K ĐŽŶŶĞĐƚŽƌ ƚŽ ĞĂĐŚ DŽĚĞů ϰϯϬ Yh E K ĐŽŶŶĞĐƚŽƌ ì ĂďůĞ ĨƌŽŵ ƚŚĞ DŽĚĞů ϭϳϬϬ ŝƋƵŝĚ ĞůŝƵŵ ĞǀĞů ŶƐƚƌƵŵĞŶƚ E KZ ĐŽŶŶĞĐƚŽƌ ƚŽ ŽŶĞ ŽĨ ƚŚĞ Ͳ džŝƐ DŽĚĞů ϰϯϬ Ğ s d DW ĐŽŶŶĞĐƚŽƌƐ ï DĂŐŶĞƚ ƚĂƚŝŽŶ ĐĂďůĞ ĨƌŽŵ ƌLJŽƐƚĂƚ ñ DĂŐŶĞƚ ƚĂƚŝŽŶ zͲƚŽͲ ŝŶƚĞƌĐŽŶŶĞĐƚ ĐĂďůĞ dK ZzK d d AMERICAN MAGNETICS INC OAKRIDGE TN USA AUXI O RS 232 ETHERNET VALVECON...

Page 56: ...ĂůĞ ƐƉůŝƚ ƚŽ ƚǁŽ ϵͲƉŝŶ ŵĂůĞͿ ĨƌŽŵ DŽĚĞů ϭϳϬϬ ŝƋƵŝĚ ĞůŝƵŵ ĞǀĞů ŶƐƚƌƵŵĞŶƚ Ƶdž K ĐŽŶŶĞĐƚŽƌ ƚŽ ĞĂĐŚ DŽĚĞů ϰϯϬ Yh E K ĐŽŶŶĞĐƚŽƌ ì ĂďůĞ ĨƌŽŵ ƚŚĞ DŽĚĞů ϭϳϬϬ ŝƋƵŝĚ ĞůŝƵŵ ĞǀĞů ŶƐƚƌƵŵĞŶƚ E KZ ĐŽŶŶĞĐƚŽƌ ƚŽ ŽŶĞ ŽĨ ƚŚĞ Ͳ džŝƐ DŽĚĞů ϰϯϬ Ğ s d DW ĐŽŶŶĞĐƚŽƌƐ ó DĂŐŶĞƚ ƚĂƚŝŽŶ ĐĂďůĞ ĨƌŽŵ ƌLJŽƐƚĂƚ ï DĂŐŶĞƚ ƚĂƚŝŽŶ zͲƚŽͲ ŝŶƚĞƌĐŽŶŶĞĐƚ ĐĂďůĞ ñ DŽĚĞů ϰϯϬ ƚŽ ƌĞĂŬŽƵƚ Ždž DĂŐŶĞƚ ƚĂƚŝŽŶ ŝŶƚĞƌĐŽŶŶĞĐƚ ĐĂďůĞ t ŶƚĞƌĐŽŶŶĞĐƚŝŽŶ ĐĂďůĞ ƌ...

Page 57: ...ŽƌƐ ϭͲϰ î ĂďůĞ ϵͲƉŝŶ ĨĞŵĂůĞ ƐƉůŝƚ ƚŽ ƚǁŽ ϵͲƉŝŶ ŵĂůĞͿ ĨƌŽŵ DŽĚĞů ϭϳϬϬ ŝƋƵŝĚ ĞůŝƵŵ ĞǀĞů ŶƐƚƌƵŵĞŶƚ Ƶdž K ĐŽŶŶĞĐƚŽƌ ƚŽ ĞĂĐŚ DŽĚĞů ϰϯϬ Yh E K ĐŽŶŶĞĐƚŽƌ ì ĂďůĞ ĨƌŽŵ ƚŚĞ DŽĚĞů ϭϳϬϬ ŝƋƵŝĚ ĞůŝƵŵ ĞǀĞů ŶƐƚƌƵŵĞŶƚ E KZ ĐŽŶŶĞĐƚŽƌ ƚŽ ŽŶĞ ŽĨ ƚŚĞ Ͳ džŝƐ DŽĚĞů ϰϯϬ Ğ s d DW ĐŽŶŶĞĐƚŽƌƐ r DĂŐŶĞƚ ƚĂƚŝŽŶ ĐĂďůĞ ĨƌŽŵ ƌLJŽƐƚĂƚ ñ DĂŐŶĞƚ ƚĂƚŝŽŶ zͲƚŽͲ ŝŶƚĞƌĐŽŶŶĞĐƚ ĐĂďůĞ ó DŽĚĞů ϰϯϬ ƚŽ ƌĞĂŬŽƵƚ Ždž DĂŐŶĞƚ ƚĂƚŝŽŶ ŝŶƚĞƌĐŽŶŶĞĐƚ ĐĂďůĞ ...

Page 58: ... DŽŶŝƚŽƌ ĞŶƐŽƌƐ ϭͲϰ î DŽĚĞů ϰϯϬ ƚŽ ƌĞĂŬŽƵƚ Ždž DĂŐŶĞƚ ƚĂƚŝŽŶ ŝŶƚĞƌĐŽŶŶĞĐƚ ĐĂďůĞ dK ZzK d d dK d DW Z dhZ DKE dKZ Two Axis Cryogen free System Signal Interconnections DŽĚĞů ϰϯϬ ZĞĂƌ WĂŶĞůƐ ϭ Ͳ džŝƐ zͲ džŝƐ yͲ džŝƐ Ϯ ϯ ƌĞĂŬŽƵƚ Ždž d DW DKE dKZ ϭͲϰ dK ZzK d d d DW DKE dKZ ϱͲϴ dK KEdZK Z hy Zz ϰ ϱ ϲ r ŶƚĞƌĐŽŶŶĞĐƚŝŽŶ ĐĂďůĞ ƌĞĂŬŽƵƚ ďŽdž ƚŽ dĞŵƉ DŽŶŝƚŽƌ ĞŶƐŽƌƐ ϱͲϴ î DĂŐŶĞƚ ƚĂƚŝŽŶ zͲƚŽͲ ŝŶƚĞƌĐŽŶŶĞĐƚ ĐĂďůĞ ì DĂŐ...

Page 59: ...only encountered configurations are 1 superconducting magnets without a persistent switch and 2 operation on a short circuit or low resistance load SUPERCONDUCTING MAGNETS WITH NO PERSISTENT SWITCH An external stabilizing resistor for superconducting magnets without a persistent switch is no longer required4 However electronically stabilizing such magnets requires a filter that has a differentiati...

Page 60: ...80 SHORT CIRCUIT OR RESISTIVE LOAD If operating with a short circuit as a load without the presence of a superconducting magnet or with the power leads shorted at the cryostat the Model 430 Programmer Stability Mode must be configured for Test see page 78 NOTE If you have purchased a superconducting magnet with the Model 430 Programmer AMI will normally provide a recommended stability setting for ...

Page 61: ... user in verifying key system components 1 Using the appropriate diagram from the Installation section as a guide verify all system components are connected as shown If there is any doubt as to the correct connection of a component contact an AMI Technical Support Representative The user may be required to properly make a few connec tions between the various system components which were disconnect...

Page 62: ...amping to the target current by pressing the RAMP PAUSE key status indicator changes from P to 9 The system should ramp to 10 A in approximately 2 seconds 6 Verify this is the case NOTE IfWith an energy absorber unit is connected the Model 430 Programmer may take significantly longer to ramp the current to 10 A The Model 430 must first develop a supply output voltage to overcome the forward voltag...

Page 63: ... power supply current dis play if provided should also indicate the new value 14 Press the RAMP TO ZERO key to ramp the system to zero current 15 Perform remote control software checkout as required 16 Turn off the power supply s 17 Reset the Stability Mode to Auto or Manual as appropriate for the magnet system to be operated and if necessary the parameters for an installed Per sistent Switch Then...

Page 64: ...48 REV 9 AMERICAN MAGNETICS INC INSTALLATION POWER UP AND TEST PROCEDURE ...

Page 65: ...to prompt the user in order to ensure the power supply is energized at the proper time The Model 430 Programmer should always be de energized after the power supply is shut down MODEL 430 PROGRAMMER POWER ON OFF Place the Model 430 Programmer power switch in the I ON position After the Model 430 Programmer is powered on and fully initialized about 20 seconds the following display will appear After...

Page 66: ...CK THE ZERO FLUX CURRENT TRANSDUCER If the system includes the High Stability Option then a zero flux current transducer is provided The current transducer must be connected to the Model 430 rear panel CURRENT TRANSDUCER connector CAUTION Operating the system without power applied to the current transducer CT can result in loss of control and may damage the CT The current transducer receives power...

Page 67: ... display indicates either the field strength or current1 This is always displayed in the upper left corner of the display see the figure above regardless of what else is being displayed on the Model 430 Programmer display The parameter displayed field or current is toggled by pressing SHIFT followed by FIELD CURRENT Thus if field strength is being displayed pressing SHIFT followed by FIELD CURRENT...

Page 68: ... on page 51 regardless of what else is being displayed on the Model 430 Programmer display The parameter displayed magnet voltage or power supply voltage is toggled by pressing SHIFT followed by Vs Vm i e SHIFT 0 NOTE The right and left arrow keys can also be used to toggle the Voltage Display area to show the present temperature in Kelvin as optionally read via the Auxiliary Input 3 For more deta...

Page 69: ...s Paused Ramping Up Ramping Down and Holding MAIN DISPLAY The default main display the rightmost portion of the display see the figure on page 51 shows either a voltmeter indicating magnet voltage or ramp mode and persistent switch heater state Ramp mode is displayed on the top line of the main display it will be one of ten states as listed in the table on page 111 The persistent switch heater sta...

Page 70: ... a prompt for the next digit or decimal entry and the display will show an asterisk indicating that numeric entry is active An example of a numeric entry in progress numeric entry active is illustrated below Once the numeric value has been entered press the ENTER key to accept the numeric value Values are not applied to the operation of the Model 430 Programmer until the ENTER key is pressed and t...

Page 71: ...e ESC key is pressed when numeric entry is not active the current submenu will be exited and the next higher level submenu will be entered USING THE FINE ADJUST KNOB For menu items requiring entry of a numeric value the value may alternatively be adjusted with the front panel fine adjust knob These menu items include Target Field Setpoint in holding mode or while ramping Voltage Limit Ramp Rate if...

Page 72: ...adjust in progress fine adjust knob is live is illustrated below NOTE The fine adjust knob is velocity sensitive meaning that the faster the knob is turned the more coarse the adjustment Slow manipulation of the knob will yield very fine resolution even beyond that displayed by the Model 430 Programmer When the desired numeric value has been set using the fine adjust knob the ENTER key is pressed ...

Page 73: ...s the item selector one picklist value to the left and pressing the right keypad arrow moves the item selector one picklist value to the right When the last picklist value is reached and the right keypad arrow is pressed the item selector will move to the first picklist value Likewise when the item selector is pointing to the first picklist value and the left keypad arrow is pressed the item selec...

Page 74: ... is energized and this key is pressed the persistent switch heater is de energized The power supply output is then maintained for the time set by the PSwitch Cooled Time setting before being ramped down to zero at the PSw P S Ramp Rate setting default rate is 10 A sec If the persistent switch heater is de energized and this key is pressed the power supply is ramped to the current present in the ma...

Page 75: ...ransitions The nominal switch heating current is listed on the magnet specification sheet and may be entered in the Model 430 Programmer by accessing the Switch submenu6 In addition to the heating current the user must also specify the switch transition detection method PSw P S Ramp Rate and cooling gain If the switch transition is timer based then the heated time and cooled time must also be spec...

Page 76: ... a cooled persistent switch should exhibit An additional safety factor delay of 5 seconds is added for each transition once the limits are exceeded Magnet voltage based transition detection requires magnet voltage taps connected to pins 11 12 of the Magnet Station connector as described on page 194 9 During magnet voltage based transitions the running variance in nanovolts2 nV squared is shown in ...

Page 77: ...s a sign for four quadrant systems since it defines a single setpoint within the entire field current range of the system positive and negative When on the default display pressing the SHIFT TARGET FIELD SETPOINT keys will display the Magnet Current Field for three seconds before reverting to the default display Pressing any key will clear the display The value displayed is as follows When in driv...

Page 78: ...ero after the RAMP PAUSE button is pressed press the RAMP TO ZERO button again to continue ramping to zero from the paused state NOTE If the magnet is persistent i e switch heater is not energized when the RAMP TO ZERO key is pressed the Model 430 Programmer ramps the power supply current to zero the magnet current will remain constant since the magnet is in persistent mode SHIFT KEY COMMANDS MENU...

Page 79: ...le range is defined by the setting of the coil constant and the allowable range of the ramp rate in terms of current as specified in the table on page 7 If the Ramp Segments value13 is greater than 1 then the menu also allows setting of the field or current range for each ramp rate segment The Model 430 Programmer will ramp at the specified rate if the available compliance of the power supply is s...

Page 80: ...t the segment 1 ramp rate to a value of 0 2 A sec The right arrow key is pressed once to access the segment 1 range display The numeric and ENTER keys or fine adjust knob are used to set the segment 1 current range upper bound to a value of 55 A Pressing the right arrow key accesses the next second segment ramp rate display The segment 2 ramp rate is set to a value of 0 1 A sec The right arrow key...

Page 81: ...ment is being edited while the Model 430 is ramping and the system current field transitions from the currently edited segment to the next before the adjustment has been committed with the ENTER key the adjusted value will be discarded The display will update to show the new segment ramp rate and the fine adjust knob will apply to the new segment assuming the ENTER key is pressed before the segmen...

Page 82: ...ounted for when setting the Voltage Limit as well as the voltage drop of an energy absorber if in use see page 110 for details of how to determine the appropriate Voltage Limit The Voltage Limit may be set less than or equal to the maximum output voltage of the power supply 21 The Voltage Limit functions as a bipolar limit If Voltage Limit becomes active while ramping it will be indicated by a rev...

Page 83: ...ing will be paused Alternately the RAMP PAUSE key may be pressed to pause manual ramping Manual ramping will continue until paused or the Current Limit22 is achieved NOTE If the current field is negative using the INCR FIELD key to increase make more positive the current field the magnitude of the current field decreases FIELD CURRENT SHIFT 5 The FIELD CURRENT SHIFT 5 key is used to toggle between...

Page 84: ...ld is negative using the DECR FIELD key to decrease make less positive the current field the magnitude of the current field increases FIELD UNITS SHIFT 7 Use of the FIELD UNITS SHIFT 7 key provides a shortcut to the picklist menu26 for defining whether the field is specified and displayed in units of kilogauss kG or tesla T The selected option also applies to remote interface commands The default ...

Page 85: ...IFT 0 The Vs Vm SHIFT 0 key is used to toggle the voltage display between display of the voltage across the magnet Vm and the power supply output voltage Vs See page 52 for details VOLT METER SHIFT The VOLT METER SHIFT key is used to toggle the main display between display of a voltmeter indicating magnet voltage Vm or supply voltage Vs and display of ramp mode and persistent switch heater state S...

Page 86: ...tent switch heater is on then this is an indication that the magnet field has reached the target value If the magnet is already in persistent mode then this is an indication that the current being supplied to the magnet system has reached the target value MAGNET IN PERSISTENT MODE INDICATOR CAUTION If the Model 430 Programmer power is turned off while the persistent switch is heated persistent swi...

Page 87: ...e Model 430 is powered off so that the LED state is retained even during a power cycle of the Model 430 Thus the MAGNET IN PERSISTENT MODE LED is an indicator that the magnet is persistent and has at least some persistent field CURRENT LEADS ENERGIZED INDICATOR The blue CURRENT LEADS ENERGIZED LED indicates that at least 0 1 of the maximum system current29 is flowing in the Model 430 power supply ...

Page 88: ...at there are other submenu selections off screen to the left and or right of the submenu selections shown The left and right keypad arrows to the left and right of the MENU key move the item selector between the different submenu items Pressing the left keypad arrow moves the item selector one item to the left and pressing the right keypad arrow moves the item selector one item to the right When t...

Page 89: ... all the remaining parameters in the supply submenu per the table on page 75 MISC NET SETTINGS LOAD NET SETUP SUPPLY SELECT POWER SUPPLY MIN OUTPUT VOLTAGE MAX OUTPUT VOLTAGE MIN OUTPUT CURRENT MAX OUTPUT CURRENT V V MODE INPUT RANGE SUBMENUS F o r C u s t o m s e l e c t i o n o n l y STABILITY SETTING COIL CONSTANT MAGNET INDUCTANCE PSWITCH INSTALLED PSWITCH CURRENT DETECT PSWITCH CURRENT PSWITC...

Page 90: ...elected it also exits the Select Supply picklist SELECT SUPPLY PICKLIST The Select Supply picklist provides a set of picklist items that contain presets for standard AMI power supplies The left and right keypad arrows are used to cycle through the list of selections When the item selector points at the desired power supply in the picklist ENTER is pressed to select that power supply all power supp...

Page 91: ...0 000 0 to 10 000 AMI 05240PS 200 000 AMI 05360PS 300 000 AMI 05600PS 500 000 AMI 03300PS 8 000 300 000 HP 6260B 10 000 10 000 0 000 100 000 Kepco BOP 20 5Mb 5 000 5 000 10 000 to 10 000 Kepco BOP 20 10Mb 10 000 10 000 Xantrex XFR 7 5 140 0 7 500 0 140 000 0 to 10 000 Custom c 20 000 20 000 200 000 200 000 10 000 to 10 000 a The individual 05100PS power supply unit will source 10 000 VDC at up to ...

Page 92: ...uadrant power supply without the addition of an energy absorber as shown at right in the diagram below The addition of an energy absorber to the system does not change the capabilities of the power supply itself or the values entered for the supply The addition of an energy absorber does however change the system operating ranges CUSTOM PICKLIST ITEM Custom is a unique Select Supply picklist item ...

Page 93: ...st knob on page 55 MIN OUTPUT CURRENT The minimum output current is specified in amperes A and reflects the minimum output current capacity of a connected power supply The valid range is 0 000 to 100 000 A32 and can be set by using either the numeric keypad as described on page 54 or the fine adjust knob on page 55 A unipolar power supply has a minimum output current of 0 000 A MAX OUTPUT CURRENT ...

Page 94: ...U When the Load submenu is selected several parameters associated with the superconducting magnet load can be viewed and or changed STABILITY MODE The stability mode provides configuration of the loop control gain for operating with a magnet or testing a system on a short circuit load The three available selections are Auto Manual and Test The Auto stability mode automatically sets the control gai...

Page 95: ...unstable STABILITY SETTING The stability setting is specified in percent and controls the transient response and stability of the system The value can be set by using either the numeric keypad as described on page 54 or the fine adjust knob on page 55 The valid range is from 0 0 to 100 0 The default value is 0 0 unless preset by AMI to match a specific superconducting magnet STABILITY SETTING FOR ...

Page 96: ...oaches 100 Changing the stability setting from 99 9 to 99 8 changes the gain multiplier from 0 1 to 0 2 changing the gain multiplier by a factor of 2 a 100 increase in the gain multiplier Note however that the same 0 1 change in Stability Setting from 90 to 89 9 only changes the gain multiplier from 10 to 10 1 changing the gain multiplier by a factor of 1 01 a 1 change in gain multiplier What this...

Page 97: ...y using either the numeric keypad as described on page 54 or the fine adjust knob on page 55 Values from 0 001 to 999 99999 are acceptable for the coil constant The default value is 1 00000 kG A or 0 10000 T A unless preset by AMI to match a specific superconducting magnet If the coil constant value is 0 0 kG A or 0 0 T A then no conversion from amperes to kilogauss or tesla is performed all opera...

Page 98: ... and is immediately used to adjust the control gains if the Model 430 is configured for Auto stability mode see page 78 If the magnet is persistent not ramping or encounters a ramp rate change during the measurement the measurement will be aborted with a displayed error notification and any existing magnet inductance value is retained MAGNET INDUCTANCE The magnet inductance submenu displays the pr...

Page 99: ...t not eliminate the time required for the system to forward bias the energy absorber 36 SWITCH SUBMENU The Switch submenu provides a top menu for indicating if a persistent switch is installed on the presently connected magnet load and if so several submenus for configuring the various operating parameters for the switch PSWITCH INSTALLED This picklist value indicates whether or not a persistent s...

Page 100: ...ersistent switch cur rent is slowly increased as shown on the display until the Model 430 Programmer detects a change in the load indicative of the persistent switch transitioning from superconducting to resistive Before this transition is detected the display will show the heater current value as it is increased in the persistent switch heater the magnet current is changed back to zero during thi...

Page 101: ...onally the operator can choose to use the magnet voltage method This method works by directly sensing the running mean and variance of the magnet voltage and comparing them to preset limits This method has the advantage of typically requiring much less time to sense the transition of the persistent switch from the heated to cooled state NOTE In order to use the magnet voltage switch transition det...

Page 102: ...e numeric keypad as described on page 54 or the fine adjust knob on page 55 The default is 20 seconds unless preset by AMI to match a specific superconducting magnet During the persistent switch heating period the Model 430 Programmer ramping functions are disabled The time delay is necessary to ensure that the Model 430 will not switch to the higher control gain required for proper magnet operati...

Page 103: ...the Model 430 Programmer PSWITCH POWER SUPPLY RAMP RATE The persistent switch power supply ramp rate is the rate at which the magnet power supply will automatically be ramped up or down while an installed persistent switch is in the cooled state The rate may be set to any value between 0 1 and 10 A sec The purpose of this parameter is to reduce the amount of time the system requires to either matc...

Page 104: ...t knob on page 55 PROTECTION SUBMENU The Protection submenu configures parameters related to protective measures that can be applied to magnet operation to prevent accidental damage and respond during a quench or other critical events CURRENT LIMIT CAUTION The Current Limit is normally set to the Magnet Rated Current specific to the connected superconducting magnet The setting should not be change...

Page 105: ...4 or the fine adjust knob on page 55 The Model 430 Programmer will beep once indicate an error and deny the change if the user attempts to set the Current Limit below the present Target Field Setpoint or above the maximum output current of the selected power supply ENABLE QUENCH DETECT The internal quench detection function of the Model 430 Programmer may be enabled or disabled according to the pr...

Page 106: ...e that is connected to Auxiliary Input 3 on the rear panel of the Model 430 see page 202 If set to Both the quench detection logic will operate on both the magnet current and the temperature measurement provided via Auxiliary Input 3 If either violates the predefined detection logic a quench will be detected QUENCH SENSITIVITY This picklist value specifies the sensitivity formerly called rate of t...

Page 107: ...gnet current magnitude The equations above define an operating region that is illustrated in the Ic vs Tempeature plot at the top of the following page with example parameter values of 22 A K for IcSlope 180 A for IcOffset and 5 5 K for Tmax The valid operational region is along and to the left of the line PROTECTION MODE This setting controls how the maximum current protection is applied If the P...

Page 108: ... during operation and the present magnet current then exceeds Ic the magnet is automatically ramped down in current magnitude to satisfy the Ic limit at the specified system ramp rate this includes ramping the magnet to zero field current if the present temperature exceeds Tmax If attempting to ramp the magnet current above Ic the magnet current is held at the value of Ic Either limited condition ...

Page 109: ...ture IC OFFSET This value sets the Ic Offset parameter in Amperes This value shifts the entire Ic line by a current offset A higher offset value will increase the value of Ic for a given temperature TMAX This value is a maximum allowable system temperature as measured via the Auxiliary Input channel 3 in Kelvin The Model 430 Programmer will limit entry of the Target Field Current Setpoint to a val...

Page 110: ...n of the temperature measured via the Auxiliary Input channel 3 see page 202 The measured voltage is first multipled by the T Scale factor and then the T Offset is added to determine the voltage to temperature conversion The value is determined by the specific output offset applied by the external temperature measurement device NOTE The correctness of this offset parameter is critical to the accur...

Page 111: ...ration please refer to on page 125 MISC SUBMENU When the Misc submenu is selected several miscellaneous parameters may be viewed and or changed DISPLAY BRIGHTNESS This picklist value controls display brightness As shown above there are four brightness settings from which to choose 25 50 75 and 100 The default setting is 100 RAMP SEGMENTS The ramp segments value specifies the number of current rang...

Page 112: ...m the front panel without first unlocking the setting which requires entering the correct password Note that settings protection only applies to front panel access and not to remote access via Ethernet or RS 232 The use of settings protection allows specific commands and or settings to be locked by a magnet system administrator so that the general user cannot execute those commands and or modify t...

Page 113: ...an incorrect password is entered the Model 430 Programmer beeps and again prompts for the password Once the password has been correctly entered the protection value Locked or Unlocked can be edited for each setting The default protection value for all settings is Unlocked NOTE Once the password has been correctly entered if no keys are pressed for one minute the Settings Protection submenu will be...

Page 114: ...GS LOCK This picklist value specifies whether ramp rate settings are locked or unlocked Ramp rate settings protected by this setting are use of the RAMP RATE key menu editing of the Ramp Segments value under the Misc submenu and editing of the Ramp Time Units value under the Misc submenu The default value is Unlocked POWER SUPPLY LOCK This picklist value specifies whether the Select Supply picklis...

Page 115: ...ed RESET QUENCH LOCK This picklist value specifies whether use of the RESET QUENCH SHIFT key command is locked or unlocked The default value is Unlocked INCR DECR FIELD LOCK This picklist value specifies whether use of the INCR FIELD and DECR FIELD SHIFT key commands is locked or unlocked The default value is Unlocked FIELD CURRENT LOCK This picklist value specifies whether use of the FIELD CURREN...

Page 116: ...hether accessed through the STAB key menu or under the Load submenu The default value is Unlocked INDUCTANCE LOCK This picklist value specifies whether the Sense Magnet Inductance function and Magnet Inductance value are locked or unlocked under the Load submenu The default value is Unlocked VS VM LOCK This picklist value specifies whether use of the Vs Vm SHIFT key command is locked or unlocked T...

Page 117: ...enu is locked or unlocked The default value is Unlocked CURRENT LIMIT LOCK This picklist value specifies whether the Current Limit value under the Load submenu is locked or unlocked The default value is Unlocked PSWITCH SETTINGS LOCK This picklist value specifies whether persistent switch settings are locked or unlocked Persistent switch settings protected by this setting all under the Switch subm...

Page 118: ...OCK This picklist value specifies whether the Quench Sensitivity picklist value under the Protection submenu is locked or unlocked The default value is Unlocked ABSORBER PRESENT LOCK This picklist value specifies whether the Energy Absorber Present picklist value under the Load submenu is locked or unlocked The default value is Unlocked EXTERNAL RAMPDOWN LOCK This picklist value specifies whether ...

Page 119: ...e a function of input temperature submenus are locked or unlocked under the Protection submenu The default value is Unlocked SETTINGS PASSWORD Settings Password is a password protected submenu under the Misc submenu It provides a means of changing the settings protection password When ENTER is pressed to change the settings protection password the current password must be correctly entered before ...

Page 120: ...ps and the user is prompted again to re enter the new password The new password is not accepted until it is confirmed by entering the same password a second time If ESC is pressed before confirmation is completed the display returns to the Settings Password submenu and the current password remains unchanged NET SETTINGS SUBMENU Selecting the Net Settings submenu allows all currently assigned netwo...

Page 121: ...HCP server Static indicates that the value is static assigned by the Model 430 user The default value is 0 0 0 0 However since the default method of IP address assignment is by DHCP server this value is typically set by the network DHCP server SUBNET MASK PRESENT This submenu item displays the currently assigned subnet mask for the Model 430 Programmer The value in parentheses after the subnet mas...

Page 122: ...et mask and the gateway IP address can only be assigned by the user if the currently selected method of IP address assignment is Static if the currently selected method of IP address assignment is DHCP then these three values will be set by the network DHCP server IP ADDRESS ASSIGNMENT This picklist value specifies method of IP address assignment The value can be set to either DHCP or Static If th...

Page 123: ...the user The default value is 0 0 0 0 NOTE This item is only available in the Net Setup submenu if IP Address Assignment is Static If IP Address Assignment is DHCP the subnet mask is assigned by the network DHCP server and cannot be assigned by the user GATEWAY IP ADDRESS If IP Address Assignment is Static then the gateway IP address can be assigned by the user The default value is 0 0 0 0 NOTE Th...

Page 124: ...sistent switch information is entered in the Switch submenu If your magnet Model 430 Programmer and power supply were purchased as a system from AMI the setup menus are preset by AMI to match the magnet purchased EXCELLENCE IN MAGNETICS AND CRYOGENICS American Magnetics Inc P O Box 2509 112 Flint Road Oak Ridge TN 37831 2509 Phone 865 482 1056 Fax 865 482 5472 Internet http www americanmagnetics c...

Page 125: ...ductance H 9 7 Energy Absorber Present NO PSwitch Installed YES PSwitch Current mA 41 0 PSwitch Heated Time sec 20 PSwitch Cooled Time sec 20 PSwitch P S Ramp Rate A sec 10 PSwitch Cooling Gain 0 0 Current Limit A 85 600 Enable Quench Detect YES Extern Rampdown Enabled YES Voltage Limit V 3 500b b Value is the 2 1 V charge rate plus allowances for power lead drop typically about 10 20 milliohms at...

Page 126: ... if installed plus power lead voltage drop usually less than 2 V Once the ramp rate and Voltage Limit are specified the Model 430 Programmer provides two modes of ramping manual and automatic Manual ramping will ramp to the Current Limit via manual direction control by the user Automatic ramping will ramp to the target field current automatically Automatic ramping can be thought of as a next point...

Page 127: ...des and descriptions Mode Description Ramping Automatic ramping to the target field currenta is in progress Holding The target field current has been achieved and is being maintained Paused Ramping is suspended at the field current achieved at the time the PAUSED mode was entered Manual Up Down Ramping is being controlled by the manual control INCR FIELD and DECR FIELD SHIFT key functions availabl...

Page 128: ...can be used to manipulate the output current While at the target field current menu press SHIFT followed by FINE ADJUST This will allow fine adjustment of the field current see page 69 When the fine adjust knob is turned the Model 430 Programmer will follow the target current as it is adjusted at the defined ramp rate for the segment in which it is operating Adjustment of the current is prevented ...

Page 129: ...possible to interrupt the process at any point by pressing the SHIFT ESC keys Please note that the state in which the system will remain after this interruption depends on the specific active step during which the SHIFT ESC was pressed Use this abort override keystroke with caution PROCEDURE FOR INITIAL HEATING OF THE SWITCH The Model 430 Programmer remembers the state of the persistent switch dur...

Page 130: ...ption the display will show the default display and wait at zero current for a command from the operator The magnet is no longer isolated from the power supply output PROCEDURE FOR ENTERING PERSISTENT MODE In order to enter the persistent mode of magnet operation the user should perform the following steps 1 Use either automatic or manual ramping to achieve the desired field or cur rent in the mag...

Page 131: ...andom sequence of numbers that should gradually decrease and eventually decay to a value of zero Once the variance remains at zero for at least five seconds the switch will be considered cooled c When the cooled time is complete the green MAGNET IN PERSISTENT MODE LED will illuminate and the power supply will ramp to zero at the PSw P S Ramp Rate value52 NOTE The magnet voltage Vm is monitored dur...

Page 132: ...e field current reaches the value before the cooling cycle initiation the display will indicate the persistent mode transition malfunction f After pressing ENTER the Model 430 Programmer will revert to the default field current display 5 If there is no magnet voltage error during the rampdown and after the power supply is finished ramping to zero the following screen will be displayed NOTE If desi...

Page 133: ... persistent mode proceed to step 3 2 If the Model 430 Programmer has been powered off since the magnet was placed in persistent mode complete the following steps a and b below before proceeding to step 3 a Energize the Model 430 and wait for the prompt on the Model 430 display and then energize the power supply After the power supply has been on for a few seconds53 press ENTER to clear the Model 4...

Page 134: ...e the persistent mode was entered The power supply will ramp at the PSw P S Ramp Rate value55 5 The persistent switch heater is heated for the preset heating time as set by the PSwitch Heated Time variable56 Optionally if the PSwitch Transition is set for magnet voltage the magnet voltage variance will be displayed The variance should transition from a value of zero to some number when the switch ...

Page 135: ...ot a critical error57 the screen will change back to the default display typically at some field current less than the last recorded persistent value 6 After the Model 430 Programmer has completed this persistent switch heat ing operation the display reads 7 After ENTER is pressed the default field current status screen is displayed with the power supply in the pause mode 57 This current mismatch ...

Page 136: ...urrent when the switch heater current is turned off the MAGNET IN PERSISTENT MODE LED will illuminate EXITING PERSISTENT MODE WITHOUT AUTOMATIC RAMP TO LAST KNOWN PERSISTENT MAGNET CURRENT CAUTION To avoid damage to the magnet or triggering protection circuits on the magnet the current in the power supply should match the current that was flowing in the magnet when the persistent mode was entered ...

Page 137: ...el 430 begins ramping current Point 2 The target field current setting of 28 000 A is achieved and the Model 430 Programmer switches to HOLDING mode Point 3 The user changes the ramp rate setting The user also sets a new value of 40 000 A for the target field current As soon as the new target field current is entered the Model 430 Programmer automatically begins ramping at the specified ramp rate ...

Page 138: ... PSwitch Cooled Time has elapsed Note that the magnet current remains at the Point 6 value when the magnet was placed in persistent mode Point 6c The user presses the PERSIST SWITCH CONTROL key which rapidly ramps the power supply output to the current that is flowing in the magnet The power supply matches the magnet current at point 6d Point 7 The user again increases the ramp rate and presses th...

Page 139: ...safe limit the Model 430 will trigger a quench detection The Model 430 may also be configured to use both the current mismatch and temperature detection methods and trigger a quench if either indicate a problem NOTE The Model 430 quench detection features should never be relied upon as the primary quench safing for any magnet system The purpose of the Model 430 quench detection is simply to avoid ...

Page 140: ...ontact closure see page 199 of the Appendix for the connector pinout If the quench input is asserted then the Model 430 Programmer interprets this input as indication of a quench condition and the Model 430 automatically sets the power supply output voltage to zero and will not respond to further input until the RESET QUENCH key is used to clear the quench detect condition or until the quench cond...

Page 141: ...ween the magnet current and the real time setpoint current of the Model 430 EXTERNAL RAMPDOWN This feature60 is useful in any application requiring magnet rampdown in response to any external event that can be signaled by the closure of a pair of electrical contacts61 The user input for initiating external rampdown is provided on the rear panel of the Model 430 Programmer The process is started by...

Page 142: ...supply to the magnet cur rent 2 Once the power supply is at the magnet current the FIELD AT TARGET LED will light and the unit will momentarily hold 3 Following a short hold the persistent switch will be heated to place the power supply in control of magnet current 4 After heating turning off the persistent switch the MAGNET IN PER SISTENT MODE LED extinguishes and rampdown begins The FIELD AT TAR...

Page 143: ...gnet not in PERSISTENT mode the persistent switch is either heated or not installed so there is no need for persistent switch heating The power supply is already at and in control of the magnet current so the Model 430 Programmer executes an ordinary rampdown 1 The rampdown begins immediately as described on page 126 step 4 of External Rampdown while in Persistent Mode 2 The sequence continues as ...

Page 144: ...oltage V 0 000 to 20 000 6 000 Max Output Voltage V 0 001 to 20 000 6 000 Min Output Current A see table on page 7 125 000 Max Output Current A see table on page 7 125 000 V V Mode Input Range V 10 000 to 10 000 10 000 to 10 000 Stability Setting 0 0 to 100 0 0 0 Coil Constant kG A 0 001 to 999 99999 1 0 Inductance H 0 0 to 1000 0 0 0b PSwitch Current mA 0 0 to 125 0 10 0 PSwitch Heated Time sec 5...

Page 145: ...ort or vice versa which can prove to be a useful resource SCPI COMMAND SUMMARY The following manual conventions are used for SCPI Standard Commands for Programmable Instruments syntax for the remote interface commands Braces enclose valid parameter choices A vertical bar separates multiple choices for each parameter Triangle brackets indicate that you must supply a value Parentheses within indicat...

Page 146: ...DN RST TST LED Ctrl C PRINT SERIALnumber PRINT PASSword SETTINGS SYSTem LOCal SYSTem REMote SYSTem TIME SYSTem TIME SET date mm dd yyyy time hh mm ss SYSTem ERRor see page 150 for more information STB SRE enable_value SRE CLS ESR ESE enable_value ESE PSC 0 1 PSC OPC OPC System Related Commands Status System Commands ...

Page 147: ...kG A T A CONFigure INDuctance inductance H CONFigure ABsorber 0 1 STABility MODE STABility STABility RESistor COILconst INDuctance SENSe INDuctance ABsorber see page 156 for more information CONFigure PSwitch 0 1 CONFigure PSwitch CURRent current A CONFigure PSwitch TRANsition 0 1 CONFigure PSwitch HeatTIME time sec CONFigure PSwitch CoolTIME time sec CONFigure PSwitch PowerSupplyRampRate rate A s...

Page 148: ...t ICSLOPE value A K CONFigure OPLimit ICOFFSET value A CONFigure OPLimit TMAX value K CONFigure OPLimit TSCALE value K V CONFigure OPLimit TOFFSET value K CONFigure RAMPDown ENABle 0 1 CURRent LIMit QUench DETect QUench RATE OPLimit IC OPLimit TEMP OPLimit MODE OPLimit ICSLOPE OPLimit ICOFFSET OPLimit TMAX OPLimit TSCALE OPLimit TOFFSET RAMPDown ENABle see page 160 for more information CONFigure R...

Page 149: ...igure LOCK STABility 0 1 CONFigure LOCK INDuctance 0 1 CONFigure LOCK VOLTage VS VM 0 1 CONFigure LOCK VOLTMeter 0 1 CONFigure LOCK FINEadjust 0 1 CONFigure LOCK COILconst 0 1 CONFigure LOCK CURRent LIMit 0 1 CONFigure LOCK CURRent RATING 0 1 CONFigure LOCK PSwitch SETtings 0 1 CONFigure LOCK QUench DETect 0 1 CONFigure LOCK QUench RATE 0 1 CONFigure LOCK ABsorber 0 1 CONFigure LOCK RAMPDown 0 1 C...

Page 150: ...IGHTness LOCK NETsetup LOCK OPLimit see page 167 for more information CONFigure IPNAME system name IPNAME see page page 167 for more information CONFigure VOLTage LIMit voltage V CONFigure CURRent TARGet current A CONFigure FIELD TARGet field kG T CONFigure RAMP RATE CURRent segment rate A s A min upper bound A CONFigure RAMP RATE FIELD segment rate kG s kG min T s T min upper bound kG T VOLTage L...

Page 151: ... PAUSE INCR DECR ZERO STATE see page 171 for more information PSwitch 0 1 PSwitch PERSistent see page 172 for more information QUench 0 1 QUench Quench COUNT QUenchFile QUenchBackup see page 173 for more information CONFigure RAMPDown RATE SEGments value Measurement Commands and Queries Ramping State Commands and Queries Switch Heater Commands and Queries Quench State Commands and Queries Rampdown...

Page 152: ...RAMPDownBackup see page 176 for more information ETE enable_value ETE TRG these commands act as remote keypresses on any interface port see the table on page 146 W_KEYSTRING_SHIFT W_KEYSTRING_TARGET W_KEYSTRING_ZEROFIELD W_KEYSTRING_PERSISTENT W_KEYSTRING_RAMPPAUSE W_KEYSTRING_1 W_KEYSTRING_2 W_KEYSTRING_3 W_KEYSTRING_4 W_KEYSTRING_5 W_KEYSTRING_6 W_KEYSTRING_7 W_KEYSTRING_8 W_KEYSTRING_9 W_KEYSTR...

Page 153: ... or the entire keyword CONFIGURE Any other form of the keyword is illegal and will generate an error Many commands also require multiple keywords to traverse the tree structure of the entire Model 430 Programmer command set For example commands associated with a current setting require the prefix of CONFigure CURRent Note that a colon separates the keywords No spaces are allowed before or after th...

Page 154: ...ter are reported to the Status Byte register group An enable register can be both written and queried The CLS clear status command does not clear an enable register To enable or disable bits in an enable register write a decimal value which corresponds to the binary weighted sum of the bits you wish reported to the Status Byte register Ϭ ϭ Ϯ ϯ ϰ ϱ ϲ ϳ фϭх фϮх фϰх фϴх фϭϲх фϯϮх E фϭϮϴх Ύ Z фvalueх ...

Page 155: ...l data has been read from the respective output buffer The Status Byte condition register is cleared when A CLS command is executed The Standard Event register is read only bit 5 of the Status Byte register is cleared The indicated condition no longer exists The power is turned off and then back on The Status Byte enable register is cleared when The SRE 0 command is executed The power is turned of...

Page 156: ... EVENT REGISTER The Standard Event register group reports a power on condition various error conditions and indicates when an operation has completed Any or all of the Standard Events can be reported to the Status Byte register by enabling the corresponding bit s in the Standard Event enable register see the figure on page 138 To set the Standard Event enable register write a binary weighted decim...

Page 157: ...quence there are two methods available to help prevent command queue overflows which are discussed below USING THE OPC COMMAND The OPC command is executed within the normal command queue Upon completed execution of the OPC command the Operation Complete bit bit 0 of the Standard Event register will be set This command is useful should many commands be sent to the Model 430 Programmer in rapid succ...

Page 158: ...egister the OPC query returns a 1 plus termination characters to the appropriate output buffer when executed Using OPC is a simple solution for determining completed remote command execution because commands do not send a reply It is also unambiguous during simultaneous serial and Ethernet operation since the result is returned directly to the requesting communication interface An example of a seq...

Page 159: ...ntical pinout used on IBM compatible computers The RS 232 connector pinout for the Model 430 Programmer is fully documented on page 204 in the Appendix TERMINATION CHARACTERS All commands and queries are transmitted and received as ASCII values and are case insensitive The Model 430 Programmer always transmits CR LF a carriage return followed by a linefeed at the end of an RS 232 transmission The ...

Page 160: ... Model 430 can accept CR LF CR LF or LF CR or a semicolon as termination characters from an external computer PORT ASSIGNMENTS The Model 430 accepts connections to ports 23 and 7180 Port 7180 is recommended for general command query operation When a connection is successfully established to the Model 430 the following hello message is immediately returned American Magnetics Model 430 IP Interface ...

Page 161: ...sted message format changes to the following example output terminated with a CR LF pair The MSG_VOLTMETER_UPDATE is the delimiter text indicating the voltmeter display information follows The field current status indication and voltage displays are shown first followed by the delimited LED states in the exact same order as described above Then the displayed voltage value name is provided followed...

Page 162: ...CR LF pair The messages are described in the table below Broadcasted Custom Display Characters Character Byte Value Character Byte Value P 0x80 0x86 0x81 0x87 0x82 V 0x88 0x83 C 0x89 0x84 T 0x8A 0x85 Broadcasted Keypress and Event Messages Message ASCII format Meaning MSG_KEY_SHIFT SHIFT key pressed MSG_KEY_TARGET TARGET FIELD SETPOINT key pressed MSG_KEY_ZEROFIELD RAMP TO ZERO key pressed MSG_KEY...

Page 163: ...ressed MSG_KEY_LEFT Left arrow key pressed MSG_KEY_ENTER ENTER key pressed MSG_BEEP Audible beep emitted MSG_EXT_RAMPDOWN_START External rampdown activated MSG_EXT_RAMPDOWN_END External rampdown ended MSG_FINE_ADJ_DELTA value Encoder adjust delta value sent is a positive or neg ative integer of the number of encoder clicks user must convert to a meaningful delta for a given parameter being edited ...

Page 164: ... 430 1215001 3 00 RST Resets the Model 430 Programmer This is equivalent to cycling the power to the Model 430 Programmer using the power switch All non volatile calibration data and battery backed memory is restored Status is cleared according to the PSC setting TST Performs a self test Currently always returns 1 LED Returns a comma delimited list of the LED states with 0 OFF and 1 ON The LED fie...

Page 165: ...sary for this command to be sent prior to using a remote interface Send the SYSTem LOCal command send the RST command press SHIFT followed by MENU or cycle Model 430 Programmer power to re enable the front panel controls Disables all front panel controls If the Model 430 Programmer is in the remote mode an asterisk will appear in the front panel display in the position just below the ramping chara...

Page 166: ...to be reported in the Summary Bit bit 6 of the Status Byte register To enable bits you must write a decimal enable_value which corresponds to the binary weighted sum of the bits you wish to enable Refer to page 139 for more information For example to enable quench detections only in the Summary Bit of the Status Byte register send the command SRE 4 SRE The SRE query returns a decimal sum which cor...

Page 167: ...rd Event enable register and the Status Byte enable register are cleared at power on If PSC 0 is in effect the enable registers are not cleared at power on The default setting is 1 PSC Returns the Power On Status Clear setting currently in effect A value of 0 indicates the enable registers are not cleared at power on a value of 1 indicates the enable registers are cleared at power on OPC Sets the ...

Page 168: ...or the selected power supply type according to the table below This value can be configured only via front panel operation of the SUPPLY setup menu Return Values and Meanings for SUPPly TYPE Query Return Value Meaning 0 AMI 12100PS 1 AMI 12200PS 2 AMI 4Q05100PS 3 AMI 4Q06125PS 4 AMI 4Q06250PS 5 AMI 4Q12125PS 6 AMI 10100PS 7 AMI 10200PS 8 HP 6260B 9 Kepco BOP 20 5M 10 Kepco BOP 20 10M 11 Xantrex XF...

Page 169: ...eres This value can be configured only via front panel operation using the Supply submenu and is set automatically when a preset supply type is selected SUPPly CURRent MAXimum Returns the maximum output current capacity of the power supply in amperes This value can be configured only via front panel operation using the Supply submenu and is set automatically when a preset supply type is selected S...

Page 170: ... of a persistent switch the presence or absence of a stabilizing resistor and the estimated or measured magnet inductance STABility MODE Returns 0 for Auto stability mode 1 for Manual and 2 for Test CONFigure STABility percent Sets the stability setting in percent Valid range is 0 0 to 100 0 STABility Returns the stability setting in percent CONFigure STABility RESistor 0 1 An argument of 0 specif...

Page 171: ...ductance in Henries The measured value will automatically be stored as the currently connected inductance NOTE The inductance measurement requires the magnet voltage input to the rear panel Magnet Station connector as described on page 193 Please note that some magnet system manufacturers do not provide magnet voltage taps NOTE This remote command blocks communication for several seconds on all po...

Page 172: ...Returns the persistent switch heater current setting in mA PSwitch AUTODetect Executes the auto detection algorithm refer to page 84 and returns the appropriate persistent switch heater current in mA Note that after this value is returned it can be entered into the Model 430 Programmer using the CONFigure PSwitch CURRent command NOTE This remote command blocks communication on all ports until the ...

Page 173: ... this function operates refer to page 58 PSwitch PowerSupplyRampRate Returns the power supply ramp rate used to change the power supply output when the magnet persistent switch is cool The units are A sec CONFigure PSwitch CoolingGAIN percent Sets the persistent switch cooling gain in percent PSwitch CoolingGAIN Returns the persistent switch cooling gain in percent PROTECTION SETUP CONFIGURATION C...

Page 174: ...urrent mismatch automatic quench detection is enabled 2 indicates temperature limit quench detection is enabled 3 indicates both current mismatch and temperature limit quench detection methods are enabled CONFigure QUench RATE 1 2 3 4 5 Sets the value of the quench detect sensitivity The range is from 1 to 5 in integer increments 1 indicates the most sensitivity 5 is the least sensitivity 3 normal...

Page 175: ... in units of amperes Kelvin CONFigure OPLimit ICOFFSET value A Sets the Ic Offset value in the Operational Limits submenu The units are amperes OPLimit ICOFFSET Returns the present Ic Offset value from the Operational Limits submenu in units of amperes CONFigure OPLimit TMAX value K Sets the Tmax value in the Operational Limits submenu The units are Kelvin OPLimit TMAX Returns the present Tmax val...

Page 176: ...r disabled 0 is the default value MISC SETUP CONFIGURATION COMMANDS AND QUERIES The Misc Setup Configuration Commands and Queries provide read write access to the setup functions available for the Misc Setup submenu page 95 CONFigure RAMP RATE SEGments value Sets the number of ramp segments from 1 to 10 1 is the default See page 95 for details of the use of ramp segments RAMP RATE SEGments Returns...

Page 177: ...more information regarding the settings protection features of the Model 430 Programmer CONFigure LOCK PSwitch CONTRol 0 1 Specifies whether use of the PERSIST SWITCH CONTROL key is locked or unlocked Sending 0 unlocks A 1 locks 0 is the default value LOCK PSwitch CONTRol Returns 0 for use of the PERSIST SWITCH CONTROL key unlocked or 1 for locked CONFigure LOCK TARGet 0 1 Specifies whether use of...

Page 178: ... 0 is the default value LOCK RAMPrate Returns 0 for ramp rate settings unlocked or 1 for locked CONFigure LOCK SUPPly 0 1 Specifies whether the Select Supply picklist value is locked or unlocked If the Select Supply value is Custom then setting Power Supply Lock to Locked also prevents the custom power supply parameters Min Output Voltage Max Output Voltage Min Output Current Max Output Current an...

Page 179: ...r 1 for locked CONFigure LOCK FIELD CURRent 0 1 Specifies whether use of the FIELD CURRENT SHIFT 5 command is locked or unlocked Sending 0 unlocks A 1 locks 0 is the default value LOCK FIELD CURRent Returns 0 for use of the FIELD CURRENT SHIFT 5 command unlocked or 1 for locked CONFigure LOCK FIELD UNITS 0 1 Specifies whether the Field Units value is locked or unlocked whether accessed through the...

Page 180: ...whether use of the Vs Vm SHIFT 0 command is locked or unlocked Sending 0 unlocks A 1 locks 0 is the default value LOCK VOLTage VS VM Returns 0 for use of the Vs Vm SHIFT 0 command unlocked or 1 for locked CONFigure LOCK VOLTMeter 0 1 Specifies whether use of the VOLT METER SHIFT command is locked or unlocked Sending 0 unlocks A 1 locks 0 is the default value LOCK VOLTage VOLTMeter Returns 0 for us...

Page 181: ...s are locked or unlocked Persistent switch settings protected by this setting all under the Switch Setup submenu are PSwitch Installed PSwitch Current PSwitch Transition PSwitch Heated Time PSwitch Current Detect PSwitch Cooled PSw P S Ramp Rate and PSwitch Cooling Gain Sending 0 unlocks A 1 locks 0 is the default value LOCK PSwitch SETtings Returns 0 for persistent switch settings unlocked or 1 f...

Page 182: ...lay Brightness picklist value under the Misc submenu is locked or unlocked Sending 0 unlocks A 1 locks 0 is the default value LOCK BRIGHTness Returns 0 for Display Brightness picklist value under the Misc submenu unlocked or 1 for locked CONFigure LOCK NETsetup 0 1 Specifies whether the Net Setup submenu is locked or unlocked Sending 0 unlocks A 1 locks 0 is the default value LOCK NETsetup Returns...

Page 183: ...known as host name or computer name the name by which the Model 430 Programmer is identified on a network NOTE If the system name value is changed the Model 430 Programmer power must be cycled off for at least 5 seconds and then back on to complete the change The new value will be used internally immediately even before cycling power off and back on but the IPNAME query will return the previous sy...

Page 184: ...rated CONFigure RAMP RATE CURRent segment rate A s A min upper bound A Sets the ramp rate for the specified segment values of 1 through the defined number of ramp segments are valid in units of A sec or A min per the selected ramp rate units and defines the current upper bound for that segment in amperes see page 95 for details of the use of ramp segments NOTE The number of ramp rate segments 1 10...

Page 185: ...te units and the current upper bound for that range in kilogauss or tesla per the selected field units This command requires that a coil constant be defined otherwise an error is generated The two return values are separated by a comma For example Sent RAMP RATE FIELD 1 Returned 0 0100 5 0000 MEASUREMENT COMMANDS AND QUERIES Included are queries for collecting the present supply current voltage ma...

Page 186: ...ng state of the Model 430 Programmer For more information regarding each state see page 110 If the ramping state is commanded remotely the front panel display and LED indicators will update and accurately reflect the commanded ramping state RAMP Places the Model 430 Programmer in automatic ramping mode The Model 430 will continue to ramp at the configured ramp rate s until the target field current...

Page 187: ...ds control and query the state of the persistent switch heater For further information regarding the persistent switch heater see section on page 113 PSwitch 0 1 Turns the persistent switch heater OFF and ON Sending 0 turns the switch heater OFF Sending a 1 turns the switch heater ON The default value is 0 Return Values and Meanings for STATE Query Return Value Meaning 1 RAMPING to target field cu...

Page 188: ... is equivalent to a quench detection by the Model 430 Programmer the power supply output is forced to 0 V the quench output of the rear panel Quench I O connector is asserted and all ramping functions are disabled QUench Queries the quench state If a 0 is returned no quench condition exists If a 1 is returned a quench detect has occurred and is still in effect QUench COUNT Queries the number of re...

Page 189: ... operates in a manner similar to the normal ramp as described on page 63 but the parameters can only be edited via the remote interface CONFigure RAMPDown RATE SEGments segments Sets the number of external rampdown segments RAMPDown RATE SEGments Returns the number of external rampdown segments CONFigure RAMPDown RATE CURRent segment rate A s A min upper bound A Sets the external rampdown rate for...

Page 190: ...nstant has been defined otherwise an error is generated The two return values are separated by a comma For example Sent RAMPDown RATE FIELD 1 Returned 0 0100 5 0000 RAMPDown COUNT Queries the number of recorded rampdown events in the non backup rampdown event file RAMPDownFile Formats and sends the contents of the standard rampdown file as a formatted ASCII text stream This allows the user to view...

Page 191: ...TICS INC REMOTE INTERFACE REFERENCE COMMAND REFERENCE NOTE The RAMPDownFile and RAMPDownBackup queries can return thousands of ASCII characters Ensure your input communicaton buffers are setup to handle a large amount of text ...

Page 192: ...e serial or Ethernet output buffers is transmitted immediately Note that trigger output data may be placed in both the serial and the Ethernet output buffers if desired but the formatting and output selections are common to both Model 430 Programmer Trigger Function Bit Definitions Bit Number Bit Name Decimal Value Definition 0 Magnet Voltage 1 Magnet voltage in volts is included in trig ger outpu...

Page 193: ...ear in the trigger output string TRIGGER COMMANDS AND QUERIES ETE enable_value Enables trigger functions according to the definitions in the table on page 176 To enable the trigger functions you must write a decimal enable_value which corresponds to the binary weighted sum of the functions you wish to enable For example to enable formatted output of the time magnet field and the magnet voltage to ...

Page 194: ...e last error stored in the internal error buffer is replaced with 304 Error buffer overflow No additional errors are stored until you have cleared at least one error from the buffer If no errors have occurred and the SYSTem ERRor query is sent to the Model 430 Programmer the instrument will return 0 No errors Error strings may contain up to 80 characters Errors are classified in the following cate...

Page 195: ...mer settings on page 128 Be sure to note the field units and ramp units settings and check any unit conversions If an Operational Limits Protection Mode is enabled see section on page 91 ensure the value is below any limits such as Ic 106 Undefined coil const The user attempted to invoke a command with units of field without first setting a value for the coil constant The coil constant must be a n...

Page 196: ...ry with units of field without first setting a value for the coil constant The coil constant must be a non zero positive value 203 Query interrupted A new query was processed before the return string of a previous query had been completely transmitted to the host The new query clears the remaining data and replaces it with the new return string 204 No recorded events There are no events in the req...

Page 197: ... process completes 307 Cooled switch 0A required A persistent switch current auto detect cycle requires an initially cooled switch at zero current before initiation 308 N A when persistent Attempted to execute a function that is not available if the magnet is presently in persistent mode DEVICE ERRORS 401 Checksum failed The non volatile memory which stores the calibration data for the Model 430 P...

Page 198: ...utput stream corrupted The quench or rampdown standard or backup event file encountered an error while parsing to ASCII text 408 Unknown file format The quench or rampdown standard or backup event file contained an unknown memory format NOTE In the event the quench and or rampdown event files continue to present an error when queried for output it is possible to clear the stored history to begin a...

Page 199: ...430 Programmer clean by gently wiping with a damp cloth moistened with a mild detergent TROUBLESHOOTING HINTS The following paragraphs serve as an aid to assist the user in troubleshooting a potential problem with the Model 430 Programmer within a superconducting magnet system If the user is not comfortable in troubleshooting the system contact an AMI Technical Support Representative for assistanc...

Page 200: ...inning a troubleshooting session or contacting an Authorized AMI Technical Support Representative THE MODEL 430 DOES NOT APPEAR TO BE ENERGIZED 1 Ensure that the Model 430 Programmer is energized from a power source of proper voltage WARNING If the Model 430 Programmer is found to have been connected to an incorrect power source return the instrument to AMI for evaluation to determine the extent o...

Page 201: ...of the top cover of the Model 430 Programmer Observe the same safety procedures as presented in step 2 above FAILURE TO LOAD MESSAGE DISPLAYED AFTER POWER UP 1 Power the Model 430 Programmer off using the front panel power switch 2 Wait at least 15 seconds 3 Power the Model 430 Programmer on using the front panel switch POWER SUPPLY UNSTABLE MAGNET VOLTAGE OSCILLATES NOTE If the size of the voltag...

Page 202: ... If the Model 430 Programmer shows 0 00 A Status Ramping with the supply voltage Vs increasing or at the programmed Voltage Limit as indicated by the reverse video V status indicator there may be a problem with the power supply Verify the power supply is on and the program out connection from the Model 430 Program mer to the program voltage input to the power supply is intact 2 Verify the power le...

Page 203: ...e value of the Voltage Limit Refer to page 66 3 For unipolar power supply systems an energy absorber is usually required to ramp a magnet down in a reasonable amount of time When ramping the system down at the fastest rate achievable observe the voltage appearing at the power supply output terminals either by a voltmeter on the front of the supply or by a DVM measurement If the supply output volta...

Page 204: ...tput of the persistent switch heater is set to the appropriate value Refer to page 108 3 Ensure that there is sufficient time for the switch to warm before the power supply current is changed Increase the persistent switch heating time if needed Refer to page 86 THE MAGNET QUENCHES FOR NO APPARENT REASON 1 Ensure the magnet is not being charged at a ramp rate exceeding the capa bilities of the mag...

Page 205: ...internal green LED is not energized then the DC power converter has failed or AC power to the DC power converter has been lost Contact an Authorized AMI Technical Support Representative for a replacement 3 If the DC power converter is connected and the internal green LED is ener gized then the FAULT LED indicates the failure of an internal energy absorb ing element Do not continue to operate the u...

Page 206: ...ou are sending the correct termination to the Model 430 Programmer If you are using RS 232 make sure the baud rate number of stop bits and data bits parity settings of the host device are matched to those of the Model 430 Programmer see page 143 If you are using Ether net communications check all Model 430 Programmer network settings see page 104 3 Check your host communications software and make ...

Page 207: ...odel 430 lockup ADDITIONAL TECHNICAL SUPPORT If the cause of the problem cannot be located contact an AMI Technical Support Representative at 865 482 1056 for assistance The AMI technical support group may also be reached by internet e mail at support americanmagnetics com Additional technical information latest software releases etc are available at the AMI web site at http www americanmagnetics ...

Page 208: ...192 REV 9 AMERICAN MAGNETICS INC SERVICE RETURN AUTHORIZATION ...

Page 209: ...mmunity use shielded cabling and connect one end of the shield to the Magnet Station Connector shell The connectors provide an interface for connecting a single integrated instrumentation cable from the magnet support stand to the Model 430 Programmer The Model 430 Programmer can then be used to distribute the signals to the appropriate instruments or data acquisition systems The LHe level and tem...

Page 210: ... Function Pin Function 1 LHe Sensor I Red 14 spare 2 LHe Sensor I Black 15 spare 3 LHe Sensor V Yellow 16 spare 4 LHe Sensor V Blue 17 spare 5 Temperature Sensor I Red 18 spare 6 Temperature Sensor I Black 19 spare 7 Temperature Sensor V Yellow 20 spare 8 Temperature Sensor V Blue 21 spare 9 Persistent Switch Heater I Red 22 spare 10 Persistent Switch Heater I Black 23 spare 11 Magnet Voltage Tap ...

Page 211: ...ial if an AMI Liquid Helium Level Instrument is connected and energized The LHe level sensor pins are designed for use with an AMI LHe sensor and the wiring for the sensor is to have no live parts which are accessible Conductors connected to its terminals must be insulated from user contact by basic insulation rated for 150 VAC Category I LHe Level Temp Connectors Pin Definitions Pin Function 1 LH...

Page 212: ... SHUNT TERMINALS The shunt terminals should be connected so that positive conventional current flows from the terminal to the terminal Refer to the Installation section beginning on page 13 for a detailed description of the system interconnections for a specific system configuration WARNING Exercise caution near the shunt terminals when operating a magnet Metallic objects shorted across the shunt ...

Page 213: ...ion or systems with a maximum current greater than 250 A provides pins for connection of the external current transducer CT to the Model 430 Programmer Power to the CT is also provided via this connector The connector is a 9 pin D sub female connector with the shell lugs connected to the Model 430 Programmer chassis ground Current Transducer Connector Pin Definitions Pin Function 1 Sense Out 2 not...

Page 214: ...urn All other pins of the Program Out connector are unused NOTE For maximum noise immunity the Model 430 Programmer chassis and the chassis of any connected power supply should be tightly electrically coupled This can be accomplished through the rack mounting or by using a grounding strap between the chassis Program Out Connector Pin Definitions Pin Function Pin Function 1 not used 9 not used 2 no...

Page 215: ...n a Quench Output Model 430 Programmer NO dry contacts 2 3 n a Relay K3 Output Model 430 Programmer NO dry con tact see Pin 8 4 circuit common Quench Input customer suppled external NO dry contacts NOTE The Model 430 has a 1K Ohm pull up resistor for this input 5 6 circuit common External Rampdown Input customer supplied external NO dry contact NOTE The Model 430 has a 1K Ohm pull up resistor for ...

Page 216: ...her it is the same as if an Model 430 Programmer internal quench detection occurred Refer to page 123 for details NOTE The Model 430 Programmer takes approximately 600 microseconds from the time it detects the external quench input to execute the quench condition process Refer to page 124 for more information EXTERNALRAMPDOWN INPUT When enabled2 the external rampdown input initiates a rampdown of ...

Page 217: ...f the 430 Programmer Quench I O connector CAUTION The separate external segmented rampdown option described below ignores the Voltage Limit during the rampdown process NOTE If the number of external rampdown ramp segments is set to zero the modified rampdown is not used and the standard ramp rate table will be effective during external rampdown The Model 430 Programmer defaults to an empty rampdow...

Page 218: ...unction 1 Aux Input 1 Vm a a Auxiliary Input 1 is consumed by the magnet voltage input internally connected to the Magnet Station connector pins 11 and 12 for Model 430 units that ship with version 3 00 firmware or later It is used for the magnet voltage based switch transition detection logic and is not available for general use See page 85 for more information 9 Aux Input 4 2 Aux Input 1 Vm 10 n...

Page 219: ...Steady green when a link is established 2 Blinking amber for network activity as network packets are received or trans mitted Ethernet RJ 45 Connector Pin Definitions Pin Mnemonic Function 1 TXD Transmit differential output 2 TXD Transmit differential output 3 RXD Transmit differential input 4 not used 5 6 RXD Transmit differential input 7 not used 8 ...

Page 220: ...nnector Pin Definitions Pin Mnemonic Function 1 DCD Data Carrier Detect 2 RXD Receive Data 3 TXD Transmit Data 4 DTR Data Terminal Ready 5 GND Signal Ground 6 DSR Data Set Ready 7 RTS Request To Send 8 CTS Clear to Send 9 RI Ring Indicator PC DB9 to Model 430 RS 232 Cable Connections PC DTE DB9 Pin Model 430 DTE DB9 Pin 1 6 4 2 3 3 2 4 6 1 5 5 7 8 8 7 ...

Page 221: ...to the family of connectors containing an odd number of pins in two parallel rows with a 1 pin difference in pins per row DB9 DB15 and DB25 are most common DC dc Direct Current strictly electrical current that flows in only one direction Typ ically used also to describe an electrical power source in terms of the voltage For example 12 VDC DCE Data Communication Equipment The devices of a communica...

Page 222: ...ed with address refers to a numerical internet address IR The product I x R the voltage developed by electrical current flow I through a resistance R kG kilogauss a magnetic field unit of measurement L Electrical circuit inductance measured in henries superconducting magnets act as nearly perfect inductors when at superconducting temperatures LED Light Emitting Diode a semiconductor device that em...

Page 223: ... controls Current the power supply mode in which the Program Out voltage is in direct ratio to the output current of a connected power supply used for Short Sample mode by the Model 430 Programmer V V Voltage controls Voltage the power supply mode in which the Program Out voltage is in direct ratio to the output voltage of a connected power supply used by the Model 430 Programmer for superconducti...

Page 224: ...ose the Serial option and then the Port to which the Model 430 is con nected This example illustrates COM20 USB Serial Port COM20 which in this example is the port assigned by Windows to a USB to serial adapter cable Press OK 4 Use the Setup Serial Port menu com mand in Tera Term to show the serial parameters dialog Set the parameters as shown at right per page 143 Port selec tion is specific to y...

Page 225: ...etup Save Setup menu selection in Tera Term to save these settings as the default for new sessions Depending on where you install Tera Term you may need to spec ify a different Setup directory depending on your account privileges 7 Type IDN followed by Enter to test the connection The Model 430 Program mer should respond with AMERICAN MAGNETICS INC MODEL 430 X Y Y where X is the serial number and ...

Page 226: ...th a standard Ethernet cable 2 Turn on the Model 430 and press ENTER at the Turn on power supply prompt 3 Press MENU to enter the menu system 4 Use to navigate to the Net Settings submenu and press ENTER 5 Use as necessary to navigate to Addr Assignment Present NOTE The Addr Assignment Present must show DHCP as originally set by AMI NOTE In the following step the IP Address is the four part number...

Page 227: ...rminal size per your prefer ence and screen size 12 Optionally choose the Setup Save Setup menu selection in Tera Term to save these settings as the default for new sessions Depending on where you install Tera Term you may need to spec ify a different Setup directory depending on your account privileges 13 Type IDN followed by Enter to test the connection The Model 430 Program mer should respond w...

Page 228: ...212 REV 9 AMERICAN MAGNETICS INC APPENDIX REMOTE COMPUTER COMMUNICATION WITH THE MODEL 430 14 Issue commands or queries as desired See Remote Inter face Reference on page 129 ...

Page 229: ...ndard Ethernet cable 2 The Model430 exe upgrade file extracted from the zip file typically of the same name provided by AMI 3 FileZilla9 or other appropriate FTP Client installed on the PC For this proce dure an open source FTP client called FileZilla is illustrated Also included is an alternative upload procedure using the command line interface of the built in Windows FTP client that requires no...

Page 230: ...ry configuration 3 Turn on the Model 430 and press ENTER at the Turn on power supply prompt 4 Press MENU to enter the menu system 5 Use to navigate to Net Settings submenu and press ENTER 6 Use as necessary to navigate to Addr Assignment Present NOTE The Addr Assignment Present must show DHCP as originally set by AMI NOTE In the following step the IP Address is the four part number separated by pe...

Page 231: ...ibed The actual screens will vary depending on the files and file structure on the users PC or file server and whether FileZilla is used as the FTP Client 1 Open the FileZilla client application a screen similar to the following will appear 2 Enter the following information in the applicable fields a Host the IP Address Present as noted previously b User Name model430admin c Password supermagnets ...

Page 232: ...16 REV 9 AMERICAN MAGNETICS INC APPENDIX UPGRADING THE MODEL 430 FIRMWARE VIA FTP d Port 21 3 Click the Quickconnect button to connect to the Model 430 the Remote Site section of the screen will populate ...

Page 233: ...side representing your PC or server file system navi gate to the folder containing the Model430 exe upgrade file the folder name will be that which was previously given the new upgrade folder 5 Double click to open the upgrade folder on the Local Site left side of the screen the Model430 exe file will appear ...

Page 234: ...GNETICS INC APPENDIX UPGRADING THE MODEL 430 FIRMWARE VIA FTP 6 On the Remote Site right side representing the Model 430 files select the Upgrade folder 7 Double click the Upgrade folder to open it the folder will be empty ...

Page 235: ...ructions 10 Turn off the Model 430 11 Close the FTP program NOTE This completes the firmware upgrade When the Model 430 power is turned on again after powering down the firmware will automatically upgrade based on the Model430 exe file just placed in its Upgrade folder View the Loading screen as the Model 430 is booting up the new Firmware Version will momentarily be displayed 12 Reboot the Model ...

Page 236: ...he Model 430 do the following steps 1 Open a Windows Command Line instance and navigate to the folder where you stored the firmware upgrade during the preparation steps 2 FTP to the instrument address on the network as identified during the prepa ration The entire command line process is illustrated below 3 Login with user name model430admin and password supermagnets do not include the quotes 4 Ty...

Page 237: ...e Model 430 cover must be removed the CF card removed and the files updated using a CF card reader Once this upgrade is completed the CF card should not have to be removed in order to perform future upgrades HARDWARE AND SOFTWARE REQUIREMENTS 1 The zip file Model 430 flash card update zip is required for this upgrade the zipped files are to be extracted and copied to the CF card 2 Host computer on...

Page 238: ... into a CF reader attached to or internal to a host com puter 5 Browse to My Computer on the host computer to verify the CF card is visible as a drive UPGRADE PROCEDURE The following steps provide detailed instructions to complete the upgrade 1 Copy the zip file Model 430 flash card update zip to a location on the host computer for example C Model 430 Model 430 v1 60 Upgrade 2 Double click the zip...

Page 239: ...RMWARE VIA FLASH CARD READER 3 Choose File Extract All to start the extraction wizard 4 Click Next until prompted with Select a Destination 5 Browse to My Computer and choose the top level root of the drive associ ated with the CF card for example E or G and select Next ...

Page 240: ...ame network address scheme and be attached to the same physical network in the following process 13 Verify that the web interface is functioning correctly as follows a Connect the Model 430 to the host computer using one of the following two methods 1 Via Ethernet cable to the same physical network as the host computer 2 Via crossover or null modem Ethernet cable directly to the host computer s Et...

Page 241: ...wser on the host computer and type the IP address14 of the Model 430 into the address bar g The following screen should appear 14 This completes the installation and verification of the Model 430 Firmware Upgrade 14 In the form http xxx xxx xxx xxx where the xxx values match the IP Address Present of the Model 430 ...

Page 242: ...ugh a computer network on which the host computer resides or can directly access 1 For a host computer on a network connect a standard Ethernet cable between the Model 430 and the network 2 For a direct hardwired connection between the Model 430 and a host com puter use a null modem or crossover Ethernet cable connected from the Model 430 to the host computer NOTE Most modern computers will negoti...

Page 243: ...xecutables are provided for various computer platforms NOTE Please note that the version provided was current at the time the Model 430 was shipped Check the AMI website or the on line Git based Source Code Archive for updated versions of the Magnet DAQ application Updated versions of the Magnet DAQ may also require updating the Model 430 firmware The initial screen also includes links to the Mode...

Page 244: ...ed in the form of an installer After the installer download is complete simply launch the installer and follow the familiar installation wizard using the Next button to complete the process 7 Launch the Magnet DAQ application choose the Setup panel and enter the IP address discovered in Step 5 above 8 Press the Connect toolbar button to start communication 9 Use the provided Magnet DAQ interface t...

Page 245: ... Model 430 is allowed to continue ramping or hold a current for a sample that has quenched Samples should not be left unattended when actively ramping the sample current If the sample has quenched the Model 430 will indicate the sample current at which the quench was detected and immediately command and hold the supply output current at 0 A until the sample quench detection state is cleared The ty...

Page 246: ...echnical Support Representative The Current Limit in this context refers to the maximum allowable current through the short sample under test The Sample Voltage Null feature when exercised will quickly average several sample voltage Vss measurements and determine an offset to apply to the sample voltage to report 0 Volts for the Vss display and remote query This offset is not saved between power c...

Page 247: ... INDuctance VOLTage SUPPly VOLTage LIMit VOLTage MAGnet CURRent MAGnet COILconst PSwitch all subcommands PERSistent LOCK PSwitch CONTRol LOCK PSwitch SETtings LOCK CURRent RATING LOCK VOLTage LIMit LOCK VOLTage VS VM LOCK QUench RATE LOCK FIELD CURRent LOCK FIELD UNITS LOCK COILconst LOCK ABsorber LOCK RAMPDown QUench RATE ABsorber RAMP RATE FIELD FIELD MAGnet FIELD TARGet FIELD UNITS FIELD PRESen...

Page 248: ...232 REV 9 AMERICAN MAGNETICS INC APPENDIX SHORT SAMPLE MODE ...

Page 249: ... protection commands 161 quench control 172 173 ramping commands 167 ramping states 170 status commands 150 switch heater control 171 system commands 148 trigger commands 177 trigger functions 176 summary conventions 129 protection commands 133 protection configuration queries 133 quench state 135 ramp configuration 134 ramping state 135 setup configuration queries 131 switch heater 135 system rel...

Page 250: ...reen 203 example Ethernet communication setup 210 magnet specification sheet 108 Model 430 remote control application 226 ramp rate menus 63 ramping functions 121 RS 232 communication setup 208 setup 108 system setup 108 external quench detect 89 95 external rampdown 94 95 102 125 126 127 170 173 174 external rampdown input 200 F FAILURE TO LOAD message 185 field display 52 field units 96 fine adj...

Page 251: ... rampdown 94 enable quench detect 89 95 pswitch cooling gain 88 pswitch cooling time 86 pswitch current 85 pswitch current detect 84 pswitch heated time 86 pswitch installed 83 pswitch ramp rate 87 stability setting 79 locked 96 103 long discharge time 10 loop gain 80 M magnet current drifts while PSwitch cooling 190 oscillating 185 viewing established persistent current 61 117 magnet specs 108 me...

Page 252: ...perature display 52 93 tmax 93 P password 97 103 pause 61 persistent mode entering 114 exiting 117 viewing established magnet current 61 117 persistent switch abbreviations 206 beep 59 control 113 cooled time 55 58 59 83 86 115 122 128 cooling 53 60 87 88 111 115 120 190 cooling gain 55 59 60 83 88 128 190 current 85 current detect 83 defaults cooling gain 60 cooling period 59 heating period 59 he...

Page 253: ...ameters 143 termination characters 143 S safety cryogens xi equipment xiv legend xv quenches xiii segmented ramping 95 see ramping segmented settings 96 settings password 103 settings protection 96 setup example 108 load submenu 78 misc submenu 95 supply submenu 73 setup lock 103 Shift Key Commands Decrement Field 68 Field Current 67 Field Units 68 Fine Adjust 69 Increment Field 67 Persist Switch ...

Page 254: ... failures 190 contacting AMI support 191 excessive LHe losses 189 magnet current drifts while PSwitch cooling 190 Model 601 alarm 189 no field display 190 no power 184 operating voltage 15 oscillation 186 quenches 188 ramps slowly from zero 189 replacing the battery 185 replacing the Model 430 fuse 184 voltage limits 187 voltage selector 185 will not charge 186 187 will not discharge 187 188 troub...

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