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1.1   Product Description       

1

 

                                                        

   

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www.lakeshore.com

Chapter 1: Introduction

FIGURE

 1-1   

Model 648 front view

1.1  Product 
Description

Features:

D

Bipolar, linear, true 4-quadrant output

D

±135 A/±75 V, 9.1 kW

D

Low noise

D

1 mA of programmed current resolution

D

Analog programming and IEEE-488 and USB interfaces

D

Built-in fault protection 

The Model 648 electromagnet power supply is a robust, fault-tolerant 9 kW supply 
optimized for powering large 7 or 10 in research electromagnets. It is specifically 
designed for high precision laboratory use requiring extremely low electrical noise. 
The linear design removes undesirable higher frequency noise typical of switch mode 
power supplies. Eliminating the need for external switching or operator intervention 
to reverse current polarity, the Model 648 uses convenient bipolar, 4-quadrant oper-
ation. It is capable of supplying ±135 A/±75 V to a nominal 0.5 

,, 0.5 H load. The 

Model 648 is built to last with a rugged design, integrated fault protection, and a sim-
ple, clean interior electronic design.

This robust power supply is developed to minimize downtime. It uses worry-free 
water cooling for quiet efficient operation compared to air-cooled power supplies. 
The seamless water lines only have external junctions, eliminating internal water 
leaks. In addition, safety interlocks ensure that magnet cooling water is always flow-
ing to the supply while operating. Water can be interlocked into the power supply if 
desired. Internal software controls manage water usage intelligently.

When combined with a Lake Shore EM7 7-inch electromagnet and Model 475 DSP 
gaussmeter, the Model 648 forms a versatile electromagnet characterization system 
ideal for a wide range of user defined applications, including magneto-optical stud-
ies, magnetic hysteresis tests, susceptibility measurements, Hall effect studies, spin 
magnetic resonance demonstrations, and biological tests.

Содержание 648

Страница 1: ...tual support or relationship whatsoever has existed which in any way affects or mitigates proprietary rights of Lake Shore Cryotronics Inc in these developments Methods and apparatus disclosed herein may be subject to U S Patents existing or applied for Lake Shore Cryotronics Inc reserves the right to add improve modify or withdraw functions design modifications or products at any time without not...

Страница 2: ...ein Lake Shore undertakes no responsibility that the products will be fit for any particular purpose for which you may be buying the Products Any implied warranty is limited in duration to the warranty period No oral or written information or advice given by the Company its Agents or Employees shall create a war ranty or in any way increase the scope of this limited warranty Some countries states ...

Страница 3: ...s incurred as result of any changes made to the firmware Firmware License Agreement continued Under the terms of this agreement you may only use the Model 648 firmwareasphysically installedinthe instrument Archivalcopiesare strictly forbidden You may not decompile disassemble or reverse engineer the firmware If you suspect there are problems with the firmware return the instrument to Lake Shore fo...

Страница 4: ... conformity with the relevant Union harmonization legislation 2014 35 EU Low Voltage Directive 2014 30 EU EMC Directive 2011 65 EU RoHS References to the relevant harmonized standards used to the specification in relation to which conformity is declared EN 61010 1 2010 Overvoltage Category II Pollution Degree 2 EN 61326 1 2013 Class A Controlled Electromagnetic Environment EN 50581 2012 Signed for...

Страница 5: ...s in the User s Manual are followed there should be no degradation in EMC performance This instrument is not intended for use in close proximity to RF Transmitters such as two way radios and cell phones Exposure to RF interference greater than that found in a typical laboratory environment may disturb the sensitive measurement circuitry of the instrument Pay special attention to instrument cabling...

Страница 6: ...Model 648 Electromagnet Power Supply ...

Страница 7: ...ater Hose Connection 10 2 4 2 Magnet Coil Wiring 11 2 4 3 Temperature Switches and Flow Switches 12 2 4 4 Cooling Water and Water Valve 12 2 4 5 Grounding 13 2 4 6 Final Check Out 13 2 5 Electromagnet Operation 13 2 5 1 Air Gap and Pole Caps 13 2 5 2 Maximum Current and Power 13 2 5 3 Operation Under Field Control 15 2 5 4 Avoiding Cooling Water Condensation 15 Chapter 3 Installation 3 1 General 1...

Страница 8: ...egments 36 4 9 1 Setting Up the Ramp Segments Table 36 4 10 Pause Output 36 4 11 Zero Output 37 4 12 Maximum Setting Limits 37 4 12 1 Maximum Output Current 37 4 12 2 Maximum Current Ramp Rate 37 4 13 Magnet Water 37 4 14 Internal Water 38 4 15 Error Status Display 38 4 16 External Current Programming 39 4 17 Locking the Keypad 39 4 18 Computer Interface 40 4 18 1 Changing IEEE 488 Interface Param...

Страница 9: ... 5 3 3 2 Installing the Driver From Windows Update in Windows XP 55 5 3 3 3 Installing the Driver From the Web 55 5 3 3 3 1 Download the driver 55 5 3 3 3 2 Extract the driver 55 5 3 3 3 3 Manually install the driver 56 5 3 3 4 Installing the USB Driver from the Included CD 57 5 3 4 Communication 58 5 3 4 1 Character Format 58 5 3 4 2 Message Strings 58 5 3 5 Message Flow Control 58 5 4 Command Su...

Страница 10: ...4 1 Flow Switch 78 6 11 4 2 Water Control Valve 78 6 11 5 USB Connector 79 6 12 Technical Inquiries 79 6 12 1 Contacting Lake Shore 79 6 12 2 Return of Equipment 80 6 12 3 RMA Valid Period 80 6 12 4 Shipping Charges 80 6 12 5 Restocking Fee 80 ...

Страница 11: ...able of supplying 135 A 75 V to a nominal 0 5 0 5 H load The Model 648 is built to last with a rugged design integrated fault protection and a sim ple clean interior electronic design This robust power supply is developed to minimize downtime It uses worry free water cooling for quiet efficient operation compared to air cooled power supplies The seamless water lines only have external junctions el...

Страница 12: ...line voltage high line voltage output over voltage output over current over temperature and abrupt change of the external programming input A proprietary circuit limits the power dissipated in the water cooled cold plate should low resis tance and high line conditions exist The Model 648 protects itself if operated into resistances outside of nominal limits By limiting current output it will safel...

Страница 13: ...m into a resistive load Settling time 1 s for 10 step to within 1 mA of output into nominal load Harmonic distortion 0 1 Hz at 135 A sine wave into resistive load 0 02 THD 10 Hz at 10 A sine wave into resistive load 0 30 THD Attenuation 0 5 dB at 10 Hz external programming input Protection Short circuit line loss low line voltage high line voltage output over voltage output over current and over t...

Страница 14: ...ded OFF push buttons 1 9 5 Interface IEEE 488 2 interface Features SH1 AH1 T5 L4 SR1 RL1 PP0 DC1 DT0 C0 E1 Reading rate To 10 rdg s Software support National Instruments LabVIEW driver consult Lake Shore for availability USB interface Function Emulates a standard RS 232 serial port Baud rate 57 600 Reading rate To 10 rdg s Connector Type B USB connector Software support National Instruments LabVIE...

Страница 15: ... 21 A phase Protection 3 phase thermal relay with adjustable current setting two class CC 2 A fuses over voltage lockout circuit Frequency 50 Hz or 60 Hz Configuration 3 phase delta Connector 4 pin terminal block Line voltage must be specified at time of order but is field reconfigurable cable from power supply to facility power not included Cooling water Flow rate 7 6 L 2 0 gal min minimum Maximu...

Страница 16: ...subject to change without notice Model 648 accessories included Part number Description 6051 Terminal block 4 pin 6052 Terminal block 8 pin 6252 15 pin D sub mating connector analog I O Hose clamps Power cable strain relief power cable not included Calibration certificate MAN Model 648 Model 648 user manual Model 648 accessories available Part number Description 6043 Water valve 6201 1 m 3 3 ft lo...

Страница 17: ... the unit must be hard wired and never connected using a detachable cord In all cases the correct size wire must be chosen for the current drawn working voltage and the length of cable used To minimize shock hazard the electrical ground safety ground lead must be connected Power wiring must comply with electrical codes of the locality in which the unit is installed Ventilation The instrument has a...

Страница 18: ...ng lugs are provided for ease of moving and handling the Model 648 Always use all four lift ing lugs when lifting the unit Because of its weight the Model 648 should be handled by mechanical means To avoid injury to personnel always observe proper lifting techniques in accordance with OSHA and other regulatory agencies FIGURE 1 2 Safety symbols Direct current Equipment protected throughout by doub...

Страница 19: ...wer supply typically has an iron pole twin coil 7 in or 10 in pole diameter variable air gap and is water cooled Larger magnets can be used depending on their electrical parameters and the magnetic field requirements The electromagnet provides a uniform magnetic field in the air gap between two adjustable poles The samples which are to be tested for their magnetic properties are placed in the air ...

Страница 20: ... and the safety switches These may include any combination of temperature and flow switches These connections are shown in FIGURE 2 2 2 4 1 Water Hose Connection Water cooling is essential for these magnets The power dissipated can raise the temperature of the coils to the point where they will be destroyed In addition the samples being tested may exhibit changes in their magnetic performance with...

Страница 21: ...in TABLE 3 3 The connections must be made with the correct size of hardware for the magnet terminal We recommend the use of a spring or Belleville washer for cable terminations When the parts of a connection expand and contract with changes in temperature they tend to loosen A spring washer will reduce this tendency Typical magnet coil wiring showing series and parallel connections Power lead Powe...

Страница 22: ...ust be used in the selection of the flow switch Some switches use a sensitive reed switch which can be overpowered by stray flux from the magnet and will not open when the magnet is operating at high field The flow switch must be tested by turning off the water while the magnet is operating at full current Typical thermal switch flow switch and valve wiring To Model 648 magnet connector valve cont...

Страница 23: ...djust the air gap These parameters are determined by the size and shape of the sample and the connections that must be made to the sample Generally a smaller pole face provides a higher field within the air gap A smaller air gap also provides a higher field The pole faces must be selected to accommodate the size of the sample being tested The air gap is selected based on the size of the sample and...

Страница 24: ...s of field vs current for 6 inch pole face on the EM7 Typical curves of field vs current for 4 inch pole face on the EM10 14 CHAPTER 2 Magnet System Design Installation and Operation Model 648 Electromagnet Power Supply FIGURE 2 5 FIGURE 2 6 FIGURE 2 7 ...

Страница 25: ... point calculation Dew point calculation in degrees Celsius Relative Humidity C 100 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 32 32 31 31 29 28 27 26 24 23 22 20 18 17 15 12 9 6 2 0 29 29 28 27 27 26 24 23 22 21 19 18 16 14 12 10 7 3 0 27 27 26 25 24 23 22 21 19 18 17 15 13 12 10 7 4 2 0 24 24 23 22 21 20 19 18 17 16 14 13 11 9 7 5 2 0 21 21 20 19 18 17 16 15 14 13 12 10 8 7 4 3 0 18 1...

Страница 26: ...16 CHAPTER 2 Magnet System Design Installation and Operation Model 648 Electromagnet Power Supply ...

Страница 27: ...s several parts The items included with the Model 648 are described in the following list Contact Lake Shore immediately if there is a shortage of parts or accessories Lake Shore is not responsible for any missing items if not notified within 60 days of shipment Inspect all items for both visible and hidden damage that occurred during shipment If damage is found contact Lake Shore immediately for ...

Страница 28: ...ided for power cable entry and strain relief bushing section 3 4 4 Power terminals Four DIN terminals are provided behind a wiring cover for connection of power wiring section 3 4 5 Magnet connector A 4 pin detachable screw terminal block is provided to connect the optional magnet water valve power and temperature and or flow switch section 3 5 Auxiliary connector An 8 pin detachable screw termina...

Страница 29: ...carefully to ensure proper operation of the instrument and the safety of operators The Model 648 must be permanently wired to the facilities main wiring by a qualified electrician adhering to all local codes and standards Do not attempt to connect the power mains using a detachable cord The power wiring must be permanently wired to the facilities main wiring by a qualified electrician Failure to c...

Страница 30: ...re held in place in a locator card to maintain their spacing and prevent miswiring 3 Loosen the screws in the new terminal location four full turns to allow the entry of the wires 4 Move all four wires at once by lifting the locator card to extract the wires from the terminals 5 Move the card and wires to the correct location and insert the wires completely so that the card rests against the termi...

Страница 31: ...ly to accommodate both the configured working voltage and maximum current draw A strain relief busing must be used in installation Two different compression grommets and slip washers are provided The first a yellow slip washer and its corresponding grommet are provided in the Model 648 installation kit and are provided assembled inside the bushing body It will accommodate a 15 9 mm to 19 0 mm 0 63...

Страница 32: ...ure to install a strain relief bushing is a hazard and could cause injury or death to the operating personnel in the event of a fault Lake Shore reserves the right to void the warranty of any instrument not properly installed Typical cable entry with bushing FIGURE 3 5 ...

Страница 33: ...nd is required to prevent fault conditions which may be hazardous to operating personnel In no case should the safety ground line be omitted In no case should a neutral line be used as a safety ground All wiring must comply with the code requirements of the locality in which the instrument is installed FIGURE 3 6 shows typical input wiring The wire ferrules shown are not required but are recommend...

Страница 34: ...and the two 10 32 5 i screws provided The wiring cover installation is shown in FIGURE 3 7 Do not connect power or attempt to operate the unit with this cover removed Lethal voltage and currents exist inside There is a risk of injury or death if an operator or technician comes in contact with these potentials Wiring cover installation Chassis Wiring cover 10 32 5 8 screw 2 6 32 3 8 screw 4 FIGURE ...

Страница 35: ... to reduce water consumption when the water comes from a municipal facility Turning the water off when it is not required also reduces the probability of condensation on the magnet or connecting hoses If the cooling water comes from a facility chiller system condensation is not usually a problem and a control valve is not required In this case it is appropriate to install a flow switch optional or...

Страница 36: ...sation is not usually a problem and a control valve is not required FIGURE 3 10 shows some typical power supply connector wiring Typical power supply connector wiring Water valve Flow switch Flow switch Water valve Switch only Valve and switch 3 8 Cooling Water Two 12 7 mm 0 5 in hose barbs are provided to connect to cooling water The connection to the cooling water source should be made with two ...

Страница 37: ...RE 3 12 shows the connections required when a water valve is used The optional solenoid water valve is supplied mounted to a bracket which mounts to the rear of the Model 648 as shown in FIGURE 3 12 Hose connections are made as shown in FIGURE 3 11 When you are finished installing the cooling water hose ensure the hose cover is installed to prevent damage to the flow switch and copper tubing Water...

Страница 38: ...Refer to section 1 11 for ordering accessories FIGURE 3 13 shows how the output cables are connected to the Model 648 A plain washer and a spring or Belleville washer are provided The Belleville washer is required to maintain contact pressure through varying material thickness due to heating The magnet leads should be dressed straight down to allow the installation of the mandatory protective lug ...

Страница 39: ...al current setting or ramp Refer to section 4 16 to change the external current program mode The external current programming input is a differential input with a sensitivity of 10 V 135 A and an input impedance of 50 k The programming voltage is limited internally to approximately 10 1 V category 1 but care must be taken to insure that maximum current capability of the magnet is never exceeded 3 ...

Страница 40: ...ting Option This section briefly outlines the steps necessary to install the floor mounting option You will need the Model 648 floor mount kit Consult with the facilities personnel to confirm that the floor may be modified to support the floor mounting option and to determine the location of water or gas lines that may be present There are safety issues concerning the installation of the floor mou...

Страница 41: ...will need to press Enter until you arrive at the desired feature D Italic type The italic type indicate that there is a setting that needs to be selected E Parentheses The items that follow the italicized word and which are in parentheses are the avail able selections to which you can set the desired feature 4 2 Turning Power On Ensure the unit is configured for the appropriate AC line voltage The...

Страница 42: ...648 should be allowed to warm up for a minimum of 30 min to achieve rated accuracy 4 3 Display Definition The Model 648 has an 8 line by 40 character vacuum fluorescent VF display capable of showing both text and graphic images The features displayed during normal oper ation include current measurement voltage measurement current programming ramp rate magnet water status internal water status prog...

Страница 43: ...lert the operator to the condition The LED will go out when the condition clears 4 4 4 Ramping LED The ramping LED lights when the internal control circuitry is changing the output current When the ramp is completed and the current is at the desired point the LED goes out The LED does not light when the output current is being controlled by an external source 4 4 5 Remote LED The remote LEDlights ...

Страница 44: ...cialized keypad operations such as ramp segment entry are described in the individual operation paragraphs D Direct Operation key functions occur immediately when the key is pressed Pause Ramp and Zero Output are examples of keys that operate this way D Setting Selection allows the user to select from a finite list of parameter values During setting selection use the and keys to select a parameter...

Страница 45: ...ing is entered the supply will ramp to the new setting at the current ramp rate unless limited by the fixed com pliance voltage The ramping LED will be lit while the output current is ramping When the output current setting is entered it will be limited in magnitude by the maximum current setting Refer to section 4 12 2 to setup the maximum settings The output current setting value can be set as h...

Страница 46: ... If the Ramp Segments mode is enabled the next ramp segments screen that appears is for entering or editing the ramp segments table All five of the ramp segments are shown on the display at the same time The segments should be entered in order of increasing current An entry of 0 A will indicate the end of the table and the instru ment will not search beyond that segment For example Ramp Segment Cu...

Страница 47: ...ing mode To set the maximum output current limit press Max Settings The first maximum set ting screen appears as a prompt for the maximum output current limit The maximum output current limit value can be set as high as 135 1000 A This can be used to compensate for variances in calibration The output current is guaranteed to reach a minimum of 135 A into a 0 5 load but it may not be able to reach ...

Страница 48: ...sed when the Model 648 is first installed to purge air from the lines The Off menu selection can be used to turn it off D Disabled mode the Model 648 assumes that no valve is installed and the line for internal water status will not be displayed The internal water flow switch is monitored whenever the water valve is energized It is also monitored continuously when in Disabled mode to allow the use...

Страница 49: ...ed 4 17 Locking the Keypad The keypad lock feature prevents accidental changes to parameter values When the keypad is locked parameter values may be viewed but not changed from the front panel The Model 648 has two keypad lock modes D Lock All mode locks out changes to all parameters D Lock Limits mode locks out changes to all of the parameters except Output Setting Ramp Rate Zero Output and Pause...

Страница 50: ...n nonvolatile memory called EEPROM Instrument calibration is not affected by this operation Firmware version information for the main firmware and the DAC firmware is also displayed during this sequence To clear EEPROM memory or view the firmware versions press and hold Escape for 5 s A screen appears to show the main firmware version the DAC processor firmware version and is a prompt for returnin...

Страница 51: ...rol ler designates to the devices on the bus which function to perform The Model 648 performs the functions of Talker and Listener but it cannot be a Bus Controller The Bus Controller is the digital computer that tells the Model 648 which functions to perform TABLE 5 1 defines the IEEE 488 capabilities and subsets for the Model 648 Model 648 IEEE 488 interface capabilities and their subsets Subset...

Страница 52: ... uniline command message asserts only a single signal line The Model 648 recognizes two of these messages from the Bus Controller Remote REN and Interface Clear IFC The Model 648 sends one uniline command Service Request SRQ D REN Remote puts the Model 648 into remote mode D IFC Interface Clear stops current operation on the bus D SRQ Service Request tells the bus controller that the Model 648 nee...

Страница 53: ...rough user programs and the instru ment issues responses Two or more command strings or queries can be chained together in one communication but they must be separated by a semi colon The total communication string must not exceed 255 characters in length A command string is issued by the computer and instructs the instrument to perform a function or change a parameter setting When a command is is...

Страница 54: ...nd are not latched or buffered The register is read only 5 2 4 2 Event Registers Each register set includes an event register as shown in FIGURE 5 1 Bits in the event register correspond to various system events and latch when the event occurs When an event bit is set subsequent events corresponding to that bit are ignored Set bits remain latched until the register is cleared by a query command su...

Страница 55: ...Not used 3 OSB 7 AND Bit Name 2 1 0 AND Name Bit Name Bit Not used 2 1 2 1 0 0 ESB 5 MAV 4 3 2 used 1 Not 0 Bit Name 6 Standard Event Status Byte Generate service request Reset by Read by STB PON Power on CME Command error EXE Execution error QYE Query error OPC Operation complete RQS MSS serial poll ESE ESE Status Enable Register STB AND OSB 7 RQS AND ESR Standard Event Status Register PON 7 AND ...

Страница 56: ... over voltage OOC Output over current OSP Output stage protect LLV Low line voltage Operational Errors EPE External current program error TH Temperature high HLV High line voltage MFF Magnet flow switch fault PFF Power supply flow switch fault REF Remote enable fault CAL Calibration error OR 46 CHAPTER 5 Computer Interface Operation Model 648 Electromagnet Power Supply 5 2 4 4 Status Byte Register...

Страница 57: ...ed by the user are the enable registers All other registers in the status system are read only registers To program an enable register send a decimal value that corresponds to the desired binary weighted sum of all bits in the register TABLE 5 2 The actual commands are described throughout section 5 2 4 5 2 4 8 Clearing Registers The methods to clear each register are detailed in TABLE 5 3 Registe...

Страница 58: ... indicates a query error It occurs rarely and involves loss of data because the output queue is full D Operation Complete OPC Bit 0 when OPC is sent this bit will be set when the instrument has completed all pending operations The operation of this bit is not related to the OPC command which is a separate interface feature section 5 2 7 6 Standard event status register Name Name Bit Bit AND CME 5 ...

Страница 59: ...t through the enable regis ter see Figure 5 4 The Hardware Error Status Register is the first value of the two val ues associated with the Error Status Registers The Error Status Enable command ERSTE programs the enable register and the query command ERSTE reads it ERSTR reads and clears the Error Status Register The used bits of the Error Status Event Register are described as follows D Output St...

Страница 60: ...The used bits of the Error Status Event Register are described as follows D Remote Enable Fault Detected REF Bit 7 this bit is set if a fault condition is detected on the remote enable interlock D Power Supply Flow Switch Fault Detected PFF Bit 6 this bit is set if a fault con dition is detected on the power supply flow switch interlock D Magnet Flow Switch Fault Detected MFF Bit 5 this bit is set...

Страница 61: ...e Status Byte Register Reading all messages in the output buffer including any pending queries will clear the message available bit The bits of the Status Byte Register are described as follows D Operation Summary OSB Bit 7 set summary bit indicates that an enabled operation event has occurred D Request Service RQS Master Summary Status MSS Bit 6 this bit is set when a summary bit and the summary ...

Страница 62: ...ver a summary bit is set by an event register and its corresponding enable bit is set by the user bit 6 will set to generate a service request The Service Request Enable command SRE programs the Service Request Enable Register and the query command SRE reads it Reading the Service Request Enable Register will not clear it The register may be cleared by the user by sending SRE 0 5 2 7 3 Using Servi...

Страница 63: ...tatus Byte Register 5 2 7 5 Using Message Available MAV Bit Status Byte summary bit 4 MAV indicates that data is available to read into your bus controller This message may be used to synchronize information exchange with the bus controller The bus controller can for example send a query command to the Model 642 and then wait for MAV to set If the MAV bit has been enabled to initiate an SRQ the us...

Страница 64: ... common USB A type to B type cable to be used to connect the Model 648 to a host PC The pin assignments for A type and B type connectors are shown in section 6 11 5 The maximum length of a USB cable as defined by the USB 2 0 standard is 5 m 16 4 ft This length can be extended using USB hubs every 5 m 16 4 ft up to five times for a maximum total length of 30 m 98 4 ft 5 3 2 Hardware Support The USB...

Страница 65: ...ed and click Next 5 The Found New Hardware wizard should automatically connect to Windows Update and install the drivers If the Found New Hardware wizard is unable to connect to Windows Update or find the drivers a message saying Cannot Install this Hardware will be displayed Click the Cancel button and refer to section 5 3 3 3 to install the driver from the web 6 When the Found New Hardware wizar...

Страница 66: ...anager link in the Search Results Under Programs dialog box c If User Account Control is enabled click Continue on the User Account Control prompt 5 Click View and ensure the Devices by Type check box is selected 6 In the main window of Device Manager locate Other Devices in the list of device types In many instances this will be between Network adapters and Ports COM LPT If the Other Devices item...

Страница 67: ...hed installing the software for Lake Shore Model 648 electromagnet power supply should appear Click Finish to complete the installation 5 3 3 4 Installing the USB Driver from the Included CD The Model 648 USB driver is available on the included CD The following section describes the process of installing the driver from the CD To install the driver you must be logged into a user account that has a...

Страница 68: ...cation string must not exceed 255 characters in length A command string is issued by the computer and instructs the instrument to perform a function or change a parameter setting The format is command mnemonic space parameter data terminators Command mnemonics and parameter data necessary for each one is described in section 5 4 Terminators must be sent with every message string A query string is ...

Страница 69: ... of parameter Input Format Remarks nn nnnn current Specifiesoutput current setting 0 0000 60 1000 A Output Current Setting Command Sets the current value that the output will ramp to at the present ramp rate Setting value limited by LIMIT Sample query format SETI term SETI Brief description of query Query name Form of the query input Definition of returned parameter Syntax of returned parameter In...

Страница 70: ...nal Status Register Query 66 QWAI Wait to Continue Cmd 62 RATE Output Current Ramp Rate Setting Cmd 66 DFLT Factory Defaults Cmd 63 RATE Output Current Ramp Rate Setting Query 66 DISP Display Parameter Cmd 63 RDGI Current Output Reading Query 67 DISP Display Parameter Query 63 RDGV Output Voltage Reading Query 67 ERCL Error Clear Cmd 63 RSEG Ramp Segments Enable Cmd 67 ERST Error Status Query 63 R...

Страница 71: ...or description ESR Standard Event Status Register Query Input ESR term Returned bit weighting Format nnn Remarks Bits in this register correspond to various system events and latch when the event occurs When an event bit is set subsequent events corresponding to that bit are ignored Set bits remain latched until the register is reset by this query or a CLS com mand Refer to section 5 2 5 1 IDN Ide...

Страница 72: ...ummary bits of the Status Byte may set bit 6 RQS MSS of the Status Byte to generate a Service Request This command programs the enable register using a decimal value that corresponds to the binary weighted sum of all bits in the register Refer to section 5 2 7 2 SRE Service Request Enable Register Query Input SRE term Returned bit weighting term Format nnn Refer to command for description STB Stat...

Страница 73: ...uery Input ERST term Returned hardware errors operational errors term Format nnn nnn Remarks The integers returned represent the sum of the bit weighting of the error bits Refer to section 5 2 6 1 and section 5 2 6 2 for a list of error bits Use the ERRCL command to clear the operational errors Hardware errors cannot be cleared ERSTE Error Status Enable Command Input ERSTE hardware errors operatio...

Страница 74: ...ess 1 through 30 Address 0 and 31 are reserved Example IEEE 0 0 4 term after receipt of the current terminator the instrument uses CR LF as the new terminator uses EOI mode and responds to address 4 IEEE IEEE 488 Interface Parameter Query Input IEEE term Returned terminator EOI enable address term Format n n nn refer to command for description mode 0 Manual Off 1 Manual On 2 Auto 3 Disabled INTWTR...

Страница 75: ...n state 0 Unlock 1 Lock All 2 Lock Limits code Specifies lock out code Valid entries are 000 999 Remarks Locks out all front panel entry operations Example LOCK 1 123 term enables keypad lock and sets the code to 123 LOCK Keyboard Lock Query Input LOCK term Returned state code term Format n nnn refer to command for description MAGWTR Magnet Water Mode Command Input MAGWTR mode term Format n mode 0...

Страница 76: ... bit Refer to section 5 2 6 2 for a list of operational status bits OPSTE Operational Status Enable Query Input OPSTE term Returned bit weighting term Format nnn Refer to section 5 2 6 2 for a list of operational status bits OPSTR Operational Status Register Query Input OPSTR term Returned bit weighting term Format nnn Remarks The integers returned represent the sum of the bit weighting of the ope...

Страница 77: ...p Segments Parameters Command Input RSEGS segment current rate term Format n nnn nnn n nnnn term segment Specifies the ramp segment to be modified 1 to 5 current Specifies the upper coutput current setting that will use this segment 0 0000 135 100 A rate Specifies the rate at which the current will ramp at when the output current is in this segment 0 0001 to 50 000 A s Remarks Ramp segments are us...

Страница 78: ...will stop the output current ramp within 2 s of sending the command To restart the ramp use the SETI command to set a new output current setpoint XPGM External Program Mode Command Input XPGM mode term Format n mode 0 Internal 1 External 2 Sum Example XPGM 1 term places the Model 648 into external program mode where the output current is set by an external voltage XPGM External Program Mode Query ...

Страница 79: ... the message terminator 7 Send the entire message string at one time including the terminator Many ter minal emulation programs do not 8 Send only one simple command at a time until communication is established 9 Be sure to spell commands correctly and use proper syntax 6 2 2 Existing Installation No Longer Working 1 Power the instrument off then on again to see if it is a soft failure 2 Power the...

Страница 80: ...yntax terminator and command format 6 3 2 Existing Installation No Longer Working 1 Power the instrument off then on again to see if it is a soft failure 2 Power the computer off then on again to see if the IEEE card is locked up 3 Verify that the address has not been changed on the instrument during a memory reset 4 Check all cable connections 6 3 3 Intermittent Lockups 1 Check cable connections ...

Страница 81: ...ange the instrument line voltage To avoid potentially lethal shocks turn off the power supply and disconnect it from AC power before performing this procedure 1 Identify the power wiring access panel on the rear of the Model 648 2 Remove the perimeter screws holding the power wiring access panel 3 Observe the four voltage selection wires held by the clear plastic wiring guide FIGURE 6 3 4 Loosen t...

Страница 82: ...n Voltage tap Circuit breaker 200 V 50 A 208 V 50 A 220 V 46 A 230 V 46 A 380 V 37 A 400 V 37 A 415 V 37 A To avoid potentially lethal shocks turn off the power supply and disconnect it from AC power before performing this procedure For continued protection against fire hazard use only the recommended current setting for the line voltage selected Use this procedure to verify or change the circuit ...

Страница 83: ...on will not be possible Access to these fuses is through the power wiring access panel To avoid potentially lethal shocks turn off the power supply and disconnect it from AC power before performing this procedure For continued protection against fire hazard replace only with the same fuse type and rating specified for the line voltage selected Use this procedure to change the power line fuses 1 Id...

Страница 84: ...m settings Max output current 135 1 A Max ramp rate 50 000 A s External program mode External program mode Internal Ramp segments Ramp segments Disabled Ramp segments current 0 A Ramp segments rate 1 0000 A s Display Brightness 25 Keypad locking State Unlocked Lock code 123 Computer interface Baud 57 600 IEEE 488 address 12 IEEE 488 terminators CR LF Mode Local Water settings Magnet water Disabled...

Страница 85: ...ashortatthe outputterminals or itcouldhavebeeninternallygenerated Theoutputsetting isset to 0Aandno current entry will be allowed Cycle power to attempt to clear this error Operational errors Remote enable fault detected The remote enable connection loop is not closed The output setting is set to 0 A and no current entry will be allowed Once the loop is closed pressStatus or send ERCL over the com...

Страница 86: ...nalog I O connector Model 648 analog output connector Pin Name Pin Name 1 NC 9 NC 2 Chassis common 10 Chassis common 3 Current program 11 Current program 4 Chassis common 12 Chassis common 5 Voltage monitor 13 Voltage monitor 6 Chassis common 14 Chassis common 7 Current monitor 15 Current monitor 8 Chassis common 6 11 2 Magnet Water Connector The magnet water connector provides the means to connec...

Страница 87: ...t The relay follows the operation of the fault light on the front panel Both normally open and normally closed configu rations are provided The fault contact name represents the state of the contact in a powered off fault condition For example the normally closed NC fault con tact will be closed during a power off fault condition and open during normal operation The contacts are electrically isola...

Страница 88: ... flowing pins 1 and 2 will be closed allowing normal operation Flow switch connector Power supply water flow switch connector details Pin Name 1 Flow switch com 2 Flow switch 6 11 4 2 Water Control Valve The water control valve connector provides the means to connect a water control valve Pins 1 and 2 supply 24 VAC at 1 A for operation of a water control valve Water control valve connector Power s...

Страница 89: ...n the hours of 8 00 AM and 5 00 PM EST excluding holidays and company shut down days Contact Lake Shore Service through any of the means listed below However the most direct and efficient means of contacting is to complete the online service request form at http www lakeshore com sup serf html Provide a detailed description of the problem and the required contact information You will receive a res...

Страница 90: ...ervice Department The service engineer will use the information provided in the service request form and will issue an RMA This number is necessary for all returned equipment It must be clearly indicated on both the shipping carton s and any correspondence relating to the shipment Once the RMA has been approved you will receive appropriate documents and instructions for shipping the equipment to L...

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