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Remote Control

LiAM User’s Manual

5.3.6

“MRI” Command

The ‘MRI\r’ command returns the readback value of the power supply actual

output current.

Current readback values have a 18-bit resolution (17-bit + sign) and they are

presented with a 5-digit precision.

Replies from the power supply controller to this command are in the following

form:

#MRI:

value

where:



value

is the output current value readback [A].

The MRI command, being a reading command, returns a response in any

module condition.

Examples:

MRI example when the module is OFF:

MRI

#MRI:+0.00004

MRI example when the module is ON and regulating:

MRI

#MRI:-2.34563

Содержание LiAM 6005

Страница 2: ...2 CAEN ELS d o o Kra ka ulica 2 6210 Se ana Slovenija Mail info caenels com Web www caenels com...

Страница 3: ...SES 24 3 LIAM DESCRIPTION 26 3 1 GENERAL DESCRIPTION 26 3 1 1 Internal Protections 27 3 1 2 External Interlocks 32 3 1 2 1 Interlocks Enabling Disabling 33 3 1 2 2 Interlocks Activation States 33 3 1...

Страница 4: ...3 15 MSP Command 69 5 3 16 MSR Command 70 5 3 17 MST Command 71 5 3 18 MUP Command 72 5 3 20 VER Command 73 5 3 22 MWG Command 74 5 3 23 MWI Command 75 5 3 24 PASSWORD Command 76 5 3 25 MTUNE Command...

Страница 5: ...Document created 0 1 February 26th 2013 First draft release 1 0 March 8th 2013 First release 1 1 March 21st 2013 MTUNE command explanation 1 2 February 10th 2014 Output and Input power protection cov...

Страница 6: ......

Страница 7: ...f the instrument WARNING High voltage do NOT open the boxes CAEN ELS d o o declines all responsibility for damages or injuries caused by an improper use of the Modules due to negligence on behalf of t...

Страница 8: ...efore you use the device inspect the instrument for possible cracks or breaks before each use Do not operate the device around explosives gas vapor or dust Always use the device with the cables provid...

Страница 9: ...vironmental requirements for a correct operation of the instrument Environmental Conditions Requirements Operating Temperature 5 C to 45 C Operating Humidity 30 to 85 RH non condensing Storage Tempera...

Страница 10: ...give indication of the module operational status Remote connectivity to LIAM 6005 as for all other CAENels instrumentation is guaranteed by means of a standard RJ 45 Ethernet connection TCP IP that al...

Страница 11: ...precise shunt resistors that guarantees extremely low temperature drifts and excellent linearity External configurable interlocks are also provided on the LiAM 6005 rear panel in order to have the pow...

Страница 12: ...the power supply unit are visible the air outlets for cooling output connection terminals interlock and output status connector three phase inputs rail fuses and the analog output monitor coaxial con...

Страница 13: ...on section in order to safely and correctly install LiAM 6005 power units The VAUX voltages are used to power up the control electronic sections of the power supply and are obtained from different win...

Страница 14: ...Introduction LiAM User s Manual 14 Figure 3 simplified block diagram of the LiAM unit...

Страница 15: ...he marking WARNING indicates an injury hazard not immediately accessible as you read the marking CAUTION indicates a hazard to property including the product 2 2 Initial Inspection Prior to shipment t...

Страница 16: ...k or fire hazard do not apply a voltage to a load that is outside the range specified for that load Do Not Operate Without Covers To avoid electric shock or fire hazard do not operate this product wit...

Страница 17: ...mponent replacement is allowed to non CAEN ELS d o o personnel Never replace components with power cables connected In order to avoid injuries always disconnect power plugs directly from the wall main...

Страница 18: ...a terminal block connector on the rear of the crate as shown in Figure 5 Figure 5 rating plate and three phase input terminal connector The power supply rating plate can be found on the rear panel of...

Страница 19: ...tial NEVER connect L1 L2 and L3 lines if AC power is present on the corresponding cables Always disconnect wall AC plugs before making these connections Using a screwdriver on these screw terminal con...

Страница 20: ...nnector first Figure 7 connection of EARTH conductor 2 optional connect the interlock terminals to the load interlock signals and the output relay status if needed only connection of interlock 2 is sh...

Страница 21: ...d Figure 9 output connections to load 4 handle out and connect the three phase line inputs to the power supply ENSURE THAT THE CONNECTION TO THE WALL AC THREE PHASE MAINS IS NOT ACTIVE AND POWER CANNO...

Страница 22: ...bution network The AC mains cable needs to be fit inside the hole centering also a plastic cable tie that it is housed inside the plastic housing pass the cable tie inside the two small holes as shown...

Страница 23: ...tion Once everything is fixed you can cut the exceeding plastic part of the cable tie and then finally turn on the AC mains on the wall plug The suggested cable to be installed with this plastic prote...

Страница 24: ...ctions Please remember connect the power supply to the EARTH ground connection first 2 11 Voltage Rail Fuses The voltages used for generating the power rails on the LiAM output stage are protected wit...

Страница 25: ...s Please remove the blown fuses in the corresponding fuse holder and replace them with new ones with the same current rating and characteristics as shown in Figure 16 Please refer to the Liam 6005 Dis...

Страница 26: ...an cooling system a standard RJ 45 Ethernet socket a local display a rotary encoder with push button capability a small hole for accessing the local unit reset and four LED indicators Figure 17 LiAM m...

Страница 27: ...green light indicates that the AC mains input for the modules are correctly working OUTPUT LED the blue light indicates that the LiAM module is in ON state and it is correctly regulating the output cu...

Страница 28: ...r protection circuit that as in the case of the over current protection one has a double level of reliability i e both hardware and software This protection is hardware activated when the output volta...

Страница 29: ...e found as shown in Figure 19 after a fault condition i e set to 0 Figure 19 input circuit breaker 3 1 1 1 Rails Under voltage Protection The module voltage rails are continuously monitored by the int...

Страница 30: ...ollowing condition is true where T1 and T2 are the internal measured temperature values and TTH the pre defined factory threshold chosen for correct and safe operation 3 1 1 1 Output Over Voltage The...

Страница 31: ...nection of the load excessive value of the connected resistive load 3 1 1 1 Load Fault The load fault protection monitors that the resistive value of the load remains within a defined value interval T...

Страница 32: ...able on the rear panel interlock connector The pin index is summarized in Table 3 Pin Number Function 1 Interlock 2 2 Interlock 2 3 Interlock 1 4 Interlock 1 5 Solid State Relay return 6 Solid State R...

Страница 33: ...ASCII character formed by a single hexadecimal digit which corresponds to the binary enabling disabling mask the two external interlocks are numbered from 1 and 2 Example if only interlock 2 has to b...

Страница 34: ...e Update Parameters command see MUP command section for further details Content of the interlock enable disable mask i e EEPROM cell 48 overrides the content of the cell 49 so that the values containe...

Страница 35: ...l that is fed to the rear panel BNC Bayonet Neill Concelman connector as shown in Figure 22 Figure 22 analog current monitor coaxial connector This signal is a scaled version of the actual output curr...

Страница 36: ...ctions is not used in the LiAM power supply series it is used in other power units by CAENels The only section used is the following VALUE section This structure can be seen in Figure 23 Byte address...

Страница 37: ...Maximum heatsink temperature 21 Load Resistance Load resistive part value 22 Serial Number Module serial number 23 AC Phase Undervoltage Protection Under voltage protection threshold 13 5V 24 Rail Sw...

Страница 38: ...he LiAM unit MWG 4 3 88 r and should receive an acknowledgment reply from the power supply i e AK r Now the value 3 88 is stored in the value cell number 4 which is the cell 0x4080 since the value sec...

Страница 39: ...fines the LiAM module identification name and can be read with the MRID r command The name of the magnet connected or its identification can be directly written into this cell Slew Rate cell 30 this v...

Страница 40: ...ATION FAULT 6 INTERLOCK 2 5 INTERLOCK 1 4 CROWBAR 3 OVER TEMPERATURE 2 AC FAULT 1 FAULT 0 MODULE ON Table 5 16 bit 2 byte internal status register The status register value can be directly read by use...

Страница 41: ...s in other cases the setting of this bit implies the simultaneous setting of the fault bit Load Fault Status bit 9 this bit is set when a load fault condition appears this can be caused by an earth le...

Страница 42: ...y implemented The output stage is composed of a linear bipolar true zero crossing power circuit configuration which sources or sinks current from two symmetrical voltage rails i e positive and negativ...

Страница 43: ...it is used into normal operation to perform diagnostics e g regulation fault routine and to operate the Adaptive Rail Switching In order to check if the estimated resistive value of the load has been...

Страница 44: ...o the power supply connected to a magnet load and that the REST value computed from this procedure is found to be 11 23 In normal operation the LiAM power supply recognizes that the maximum required o...

Страница 45: ...s Manual LiAM Description 45 Figure 25 voltage rails behavior for a high value resistive load where the BLUE line is the output current the RED one the output voltage and the GREEN ones the rail volta...

Страница 46: ...pages 4 1 Boot up Page During power up or reset of the LiAM power supply unit the module model and the installed firmware version are displayed as shown in the following picture Figure 26 Figure 26 B...

Страница 47: ...of the monitor page of a LiAM power unit when the module output is off is shown in Figure 27 Figure 27 Readout display screen when module is OFF The unit identification name identifies the specific po...

Страница 48: ...dule is correctly operating FAULT the module has experienced a fault condition The fault condition can be caused by either an internal protection trip e g AC fault over temperature condition etc or an...

Страница 49: ...ng an MTUNE r command to the unit the power supply will not respond to any other command until the procedure is over During this time interval i e less than 13 seconds the power supply monitor will di...

Страница 50: ...o have a r carriage return 0x0D hexadecimal number termination character A complete list of commands except for reserved commands is herein presented and an overview for each command syntax and functi...

Страница 51: ...rocedure W MUP Update all EEPROM parameters W MWG Write selected EEPROM value cell W MWI Set output current value no ramp W PASSWORD Write password to unlock password protected cells W VER Read module...

Страница 52: ...ion mode and a write command is sent to the controller write commands are marked with a W in Table 6 a standard reply preceded by a and followed by a r character is sent back as a response to a readin...

Страница 53: ...ad r where status_reg is the 16 bit wide status register of the PS formatted in an hexadecimal string this status string has a fixed length of 4 byte i_set is the string containing the output current...

Страница 54: ...d in the set_reg and in the i_set fields thus replying and giving information on its internal status_reg i_set and i_read Thanks to this feature the power unit can be controlled only with a single com...

Страница 55: ...eply from the power supply referred to the format just presented can be interpreted as follows Module is ON Ramp is executing Ramp execution flag NO faults are present the rail at their high level han...

Страница 56: ...from its maximum current value is 1s this is done in order to avoid voltage overshoots that would be anyway smoothed and limited by the crowbar especially for high currents on strongly inductive loads...

Страница 57: ...when enabling the output Replies from the power supply to a MOFF r command are in the form AK r when the command is correctly executed or NAK r The NAK r reply is obtained if the LiAM unit is in a FAU...

Страница 58: ...the channel output again after a fault condition has been fixed In order for the power supply to keep its status register values reset it is necessary that the cause of the previous fault condition if...

Страница 59: ...r The value section of the EEPROM is used to store calibration parameters identification thresholds interlock information etc and other user definable factors For more information on how to write para...

Страница 60: ...they are presented with a 5 digit precision Replies from the power supply controller to this command are in the following form MRI value r where value is the output current value readback A The MRI c...

Страница 61: ...ile memory as an ASCII string This command is equivalent to the MRG 27 r command being the cited cell content the user selected module identification name The identification of the module can either b...

Страница 62: ...rrent value performing a ramp defined by a slew rate in A s stored in the EEPROM cell 30 The LiAM module responds with acknowledgment command AK r if the value is correctly set and with a NAK r if the...

Страница 63: ...are in the following format MRP value r where value is the measured DC Link voltage V Even if the internal ADC dedicated to this purpose has a 12 bit resolution this value is presented to the user on...

Страница 64: ...e in the following format MRN value r where value is the measured DC Link voltage V Even if the internal ADC dedicated to this purpose has a 12 bit resolution this value is presented to the user only...

Страница 65: ...d for further information on how to run this procedure Replies from the LiAM power supply unit to this command are in the following format MRR value r where value is the measured resistance Link volta...

Страница 66: ...alue is presented to the user with a 0 1 C 0 1 K resolution Replies from the LiAM power supply unit to this command are in the following form MRT value r where value is the temperature value C Celsius...

Страница 67: ...sign and they are presented with a 5 digit precision Replies from the power supply LiAM controller to this command are in the following form MRV value r where value is the output voltage readback V m...

Страница 68: ...nd it is presented with a 5 digit precision Replies from the power supply LiAM controller to this command are in the following form MRW value r where value is the output active power readback W estima...

Страница 69: ...st stored set point current value Replies from the LiAM unit controller to this command are in the following form MSP value r where value is the last stored output current set point value A The MSP co...

Страница 70: ...rate can also be set between lower limit of 0 A s and upper limit of 100 A s using the MSR command and adopting the following syntax MSR set_value r where set_value is desired slew rate value A s The...

Страница 71: ...s command are in the following format MST value r where value is the ASCII representation of the internal status register value composed by 4 hexadecimal digits and corresponding to the 16 bit wide st...

Страница 72: ...responding LiAM parameters In order to make the module update its parameters it is necessary to perform the MUP r command this was done not to apply wrong or undesired transmitted values on the fly wi...

Страница 73: ...esponse to a VER r command is in the following format VER LIAM6005 FW_ver r where FW_ver is the firmware version currently installed on the module Please remember to keep them up to date by checking f...

Страница 74: ...ning cell values exceeding these limits obtain a non acknowledgment reply NAK r This value section of the EEPROM is used to store descriptive calibration parameters identification thresholds etc and s...

Страница 75: ...changes in the output current The correct form format for this command is as follows MWI value r where value is the desired output current value A Replies from the LiAM power supply are in the form A...

Страница 76: ...ry Mapping section for further details on password protected cells These cells are accessible only to CAEN ELS d o o personnel or to experienced users The correct form format for this command is as fo...

Страница 77: ...that during the automatic tuning process lasting for about 13 seconds the communication is suspended and the power supply Ethernet socket ignores all received commands At the end of this procedure if...

Страница 78: ...wo the actual power supply IP address is known by the user In these case the new IP address configuration can be performed via a basic Telnet connection the actual power supply IP address is NOT known...

Страница 79: ...e established to port 9999 of the Ethernet device of the power supply module Please carefully follow the instructions in order to correctly set change the IP address of the LiAM power supply module es...

Страница 80: ...ress for the power supply Please note that the IP address must be entered as 4 three digit number e g 192 168 0 111 Press the Enter key until reaching the Your choice screen again Now insert 9 i e Sav...

Страница 81: ...nimum delays maximum speed performance and to avoid possible communication problems Please note that for a point to point direct connection a twisted Ethernet cable must be used The next few steps mus...

Страница 82: ...on Next Click on the Assign button Wait for the assignment procedure to end and then click Finish The new module IP address should now be assigned and the success of the operation can be verified on t...

Страница 83: ...ctive Load 100 mH more upon request Current Setting Resolution 160 A Output Current Read Back Resolution 65 A Output Voltage Read Back Resolution 1 mV Setting Accuracy 0 01 Readbacks Accuracy 0 05 Out...

Страница 84: ...ister Voltage Rail Voltages Internal Temperatures Estimated Resistive Load Cooling Forced Air Convection Remote Connectivity Ethernet TCP IP Extra Features Firmware Update Short circuit Stability Loca...

Страница 85: ...e output terminal pin 2 negative output terminal as indicated on the label that can be found over the terminal connector where also output current and output voltage ratings are presented Suggested ca...

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