User’s Manual Model 620/622/623/647 Magnet Power Supply Mode Data Entry Functions Function Menu Next Menu Local Local Normal Display 7 8 9 4 5 6 1 2 3 Esc Esc Remote Output Inhibit Cursor 0 . +/- Enter Power Fault Persistent r Switch Heate we Magnet Po Model 620 – ±50 A, ±5 V Model 622 – ±125 A, ±30 V r Supply Model 623 – ±155 A, ±30 V Model 647 – ±72 A, ±32 V Lake Shore Cryotronics, Inc. 575 McCorkle Blvd. Westerville, Ohio 43082-8888 USA E-Mail Addresses: sales@lakeshore.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual LIMITED WARRANTY Lake Shore Cryotronics, Inc. (henceforth Lake Shore), the manufacturer, warrants the instrument to be free from defects in material and workmanship for a period of twelve months from the date of shipment.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual TABLE OF CONTENTS Chapter/Paragraph Title Page List of Illustrations ......................................................................................................................................iv List of Tables..............................................................................................................................................iv Foreword ...................................................................
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual TABLE OF CONTENTS (Continued) Chapter/Paragraph 3.3 3.4 3.5 3.6 3.6.1 3.6.1.1 3.6.1.2 3.6.1.3 3.6.1.4 3.6.2 3.6.2.1 3.6.2.2 3.6.2.3 3.6.2.4 3.6.3 3.6.3.1 3.6.3.2 3.7 3.8 3.9 4 Page REMOTE OPERATION.......................................................................................................................... 4-1 4.0 4.1 4.1.1 4.1.2 4.1.2.1 4.1.2.2 4.1.2.3 4.1.3 4.1.3.1 4.1.3.2 4.1.4 4.1.4.1 4.1.4.2 4.1.5 4.2 4.2.1 4.2.2 4.2.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual TABLE OF CONTENTS (Continued) Chapter/Paragraph 5 Page ERROR MESSAGES AND TROUBLESHOOTING ...............................................................................5-1 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 6 Title General ...................................................................................................................................5-1 Software Error Messages ..........................................................
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual LIST OF ILLUSTRATIONS Figure No. Title Page 1-1 1-2 Four-Quadrant Power ...................................................................................................................... 1-4 Comparison of Old and New MPS Designs ..................................................................................... 1-5 2-1 2-2 2-3 2-4 RI, FLT, ON, and OVP Connections ..................................................................
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual FOREWORD PURPOSE AND SCOPE This manual contains user instructions for the Model 620/622/623/647 Magnet Power Supply (MPS). Lake Shore Cryotronics, Inc. designed, manufactures, and assembles the MPS in the United States of America. We welcome your comments concerning this manual. Although every effort has been made to keep it free of errors, some may occur.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Identification of Electrostatic Discharge Sensitive Components Below are various industry symbols used to label components as ESDS: HANDLING ELECTROSTATIC DISCHARGE SENSITIVE COMPONENTS Observe all precautions necessary to prevent damage to ESDS components before attempting installation. Bring the device and everything that contacts it to ground potential by providing a conductive surface and discharge paths.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual BEFORE YOU OPERATE THE EQUIPMENT Train personnel in proper emergency measures such as electrical power shut off, fire department notification, fire extinguishing, and personnel and records evacuation.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual SAFETY SYMBOLS Direct current (power line). Alternating current (power line). Alternating or direct current (power line). Three-phase alternating current (power line). Earth (ground) terminal. Protective conductor terminal. Frame or chassis terminal. Equipment protected throughout by double insulation or reinforced insulation (equivalent to Class II of IEC 536 - see annex H). Caution: High voltages; danger of electric shock.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual CHAPTER 1 INTRODUCTION 1.0 GENERAL This chapter covers Features (Paragraph 1.1), Specifications (Paragraph 1.2), and Operating Characteristics (Paragraph 1.3). 1.1 FEATURES • True, Four-Quadrant Bidirectional Power Flow: Operate current or voltage as a source or a sink in either positive or negative polarities. Sink power returns to the AC line instead of dissipating through an energy absorber.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 1.2 SPECIFICATIONS Below are performance specifications for current with a 1 Henry load and voltage with a resistive load. DC Output: True, Four-Quadrant, Bidirectional Power Flow output. Autoranging current and voltage operate as a source or a sink in either polarity in current or voltage mode. Program current and compliance voltage via the front panel, remote interfaces, or analog input. See Table 1-1 for DC Output Specifications.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Front Panel: Contains a menu driven keyboard and graphic display for entry and display of results. Operating parameters to set and monitor from the front panel (and remote interface) include: • • • • • • • • • Output current and compliance voltage setting. Output current and voltage measurement. Status reporting. Output ramp programming. Persistent switch heater control (with optional Model 6228 Card).
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Table 1-4. Model 647 DC Output Specifications SPECIFICATION CURRENT VOLTAGE Digital Programming Resolution: Standard/High 10 mA / 1 mA 10 mV / 1 mV Digital Programming Accuracy 0.1% IMAX 1% VMAX Digital Programming Repeatability 0.01% IMAX 0.1% VMAX Electronic Resolution: Standard/High 4 mA / 1 mA 1 mV / 1 mV Electronic Accuracy 0.1% IMAX 0.1% VMAX Display Resolution: Standard/High 10 mA / 1 mA 10 mV / 1 mV ±0.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Conventional MPS: Consists of a unipolar power supply with an energy absorber to dissipate magnet energy during discharge. The energy absorber prevents reverse voltage generated during the discharge from damaging the unipolar supply output. Other conventional supplies dissipate magnet energy in the power supply output transistor pass-bank.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 1.3.3 Highly Efficient, Air Cooled, Compact Unit Lake Shore MPS: Quiet switched-mode design. The output uses a proprietary pulse width modulated technique that incorporates power hybrid circuitry. Extremely low conduction loss components minimize internal power dissipation. The MPS is not a direct off-line switching supply. The output is fully floating and isolated from ground.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual CHAPTER 2 INITIAL SETUP AND CONNECTIONS 2.1 INSPECTING AND UNPACKING The MPS ships in a special cardboard box with integrated forklift skid openings. Do not stack anything on top of the MPS box. Upon receipt, set the box on a level surface with the pallet side down. Inspect the shipping container for external damage.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 2.4.1 Power and Ground Requirements The AC power source for the MPS should be frequency and voltage regulated and isolated from sources that may generate Electromagnetic Interference (EMI). The MPS is designed for single-phase 3-wire alternating current (AC) power; do not use two-wire (without ground) AC power. Lake Shore recommends Ground Fault Interrupter (GFI) and Transient Surge Protection circuitry at the AC source.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Use this procedure to connect input power to the MPS: 1. Loosen the two connector cover screws and open the cover. 2. Slip the strain relief over the power cable with the flanged end at the end to be terminated. 3. Attach the wires to the connector in accordance with prevailing color codes: green or green/yellow to the “GND” terminal, white or blue to the “N” terminal, and black or brown to the “L” terminal. 4.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 2.5.2 Shielding, Grounding, and Noise For noise reduction, tightly twist and shield the leads from the MPS to the magnet. Connect the shield to the MPS chassis as shown in Figure 2-3. WARNING: DO NOT place magnet leads in contact with other MPS/system connections or metal parts. In some instances, the user's measurement leads may pick up noise from the magnet leads.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 2.5.6 MPS Analog Current And Voltage Monitoring Connections The MPS provides amplified and buffered current and voltage monitor output signals at the terminal block on the back panel. Connect these signals to external meters to indicate output current and voltage. Obtain the Current Monitor signal through connections to terminals 9 (Im) and 11 (m) with positive output currents producing a positive monitor voltage of 10 mV/A from Im to m.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual NOTE: The MPS includes a protection circuit which reduces the effect of open sense leads during remote voltage sensing operation. If the +S lead opens, the output voltage changes because it is sensed between +OUT and the negative side of the load. If the –S lead opens, the output voltage changes because it is sensed between the positive side of the load and –OUT. If both leads open, the output voltage is sensed internally.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual c. Locate Communications Microprocessor (CMP) in the MPS rear panel. The CMP is the module with two RJ-11 telephone jacks. Loosen two screws securing CMP to MPS rear panel and slide CMP out. Just inside the CMP front panel, there is a set of DIP switches. Verify that switches 5, 6, and 7 are ON (closed) and switches 1 through 4 and 8 are OFF (OPEN). (Switches 1–4 define the control bus as Serial (RS-232C).
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual MODE INT CAL AND ID L N 100 208 120 220 240 V l V l RI + 1 2 + 3 FLT 4 ON + 5 6 7 OVP Im Vm m Vp +Vs -ls lp +ls -S +S 8 9 10 11 12 13 14 15 16 17 18 ! LINE -10% +5% 50-60 Hz FIXED INTERNALLY EXT WARNING: NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO TRAINED SERVICE PERSONNEL.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 2.7 POST-INSTALLATION INSTRUCTIONS The MPS is electrically and mechanically inspected and operationally tested prior to shipment. It should be damage-free and in perfect working order upon receipt. To confirm this, visually inspect the instrument for damage and test it electrically to detect any concealed damage upon receipt. Study the entire MPS User’s Manual before attempting to run the unit.
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Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual CHAPTER 3 OPERATION 3.0 GENERAL This chapter covers seven areas: MPS Front Panel (Paragraph 3.1), Power Up (Paragraph 3.2), Setting Current on an MPS with Manual PSH Control (Paragraph 3.3), Setting Current with Automatic PSH Control (Paragraph 3.4), Instrument Setup Screens (Paragraph 3.5), Function Menus (Paragraph 3.6), and an Automatic Persistence Control Example (Paragraph 3.7).
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 3.2 POWER UP Read and follow instructions in Paragraphs 2.1 - 2.4.3 and the Forward safety recommendations before applying power to the MPS. Do not connect the MPS to the magnet yet. Short the output terminals together with a #4 gauge or larger cable to protect the magnet against incorrect configurations. Turn on the MPS. It requires approximately 2 seconds for initialization.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual The magnet manufacturer supplies the inductance of the magnet, maximum ramp voltage, and maximum current ramp rate. The relationship for these parameters is given by the equation: Vmax ≥ L di dt where: Vmax = rated maximum magnet ramp voltage in volts, L = magnet inductance in henrys, and di/dt = maximum magnet current ramp rate in amps/second.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual MGT END: 0 to ±50.000 A (620), 0 to ±125.000 A (622), 0 to ±155.000 A (623), 0 to ±72.000 A (647) Magnet End Current. The desired magnet current. To set a new current, move to the MGT END line and enter a new current, then move to the RUN line and toggle to activate Automatic Mode. The MPS automatically ramps to the new current, returns the magnet to persistence, then ramps MPS current back down to zero. MGT RATE: 0 to ±99.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 3.6 FUNCTION MENUS The MPS uses a system of three Function Menus for setup. Function Menus 1 and 2 do not require a PSH Option Card, but the presence of one changes the look of the menus. The Function Menu 3 requires a PSH Option Card in order to display. Press Function Menu to display Function Menu 1. To choose a different menu, press Next Menu; Function Menu 2 displays. Each press of Next Menu displays the next menu.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 3.6.1.3 Step Limit/Zero Screen Press the Function Menu key to display Function Menu 1. Press the STEP LIMIT/ZERO Function Key to display the Step Limit/Zero screen to the right. This screen combines two features: Current Step Limit and Current Zero. CURRENT STEP LIMIT: ¤STATUS : I STEP : + 10.000A ¥ ZERO: STATUS I ZERO I MODE ¥ : : + 0.000A : EXTERNAL OUTPUTS: +1.999A * +0.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual IMAX SET: 0.00 A to +50.00 A (620), +125.00 A (622), +155.00 A (623), or +72.00 A (647) Current Maximum Setting. MPS current cannot exceed this setting. The software allows no setting above these limits. The rated maximum magnet current is the current above which magnet damage may occur. Never exceed the rated maximum current. IMAX is the maximum output current. ISET is the constant output current.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 3.6.2.1 Outputs Only Screen Press the OUTPUT ONLY Function key to display a screen with output values in larger characters for remote viewing. There are two screens: one with the LHe Level/Field Option, one without the LHe Level/Field Option. 3.6.2.2 LHe Level Enters the Liquid Helium (LHe) Level screen. See Paragraph 6.2 for a detailed description. 3.6.2.3 Field Enters the Field screen. See Paragraph 6.2 for a detailed description. 3.6.2.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 3.6.3.2 DELAY SETUP SCREEN WITH DITHERING To access the dithering feature, turn ON (up position) switch 5 of the rear panel CAL AND ID DIP switches. Select DELAY/DITHER from Function Menu 3 to display the AUTOMATIC MODE DELAY screen to the right. AUTOMATIC ¤RUN UP PERS OFF RAMP END PERS ON DITHER DITHER DITHER : : : : : : : MODE DELAYS: 60 S 60 S 60 S 60 S 60 S +0.50% ¥ OUTPUTS: +1.999A * +0.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 2. Enter these parameters in the Automatic Mode Screen: MAG START: Magnet Start Current (only if LAST END is unknown). For this example, we assume an initial MPS hook-up to this magnet and a previous magnet charge to 20 A. AUTOMATIC MODE: : 0.000A ¤MGT START : 0.000A MGT END : 1.000A/S MGT RATE : 1.000A/S PERS RATE : 0.000A LAST END PERSISTENCE : RUN ¥ MGT END: Magnet End Current. Enter 30 A. OUTPUTS: +0.000A * +0.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 3.9 DITHERING IN AUTOMATIC MODE Dithering is a means of arriving at the magnet current by executing excursions around the final current which decay to zero in a specified dwell (delay) time. For example, suppose the final magnet current (MGT END) is 100 amperes, the maximum dither is 0.5%, and the Dither Delay is 30 seconds. The operation in the Automatic Mode proceeds the same as in Paragraph 3.
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Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual CHAPTER 4 REMOTE OPERATION 4.0. GENERAL Either of two computer interfaces on the optional 6224 card permit remote MPS operation: the IEEE-488 Interface (Paragraph 4.1) and the Serial Interface (Paragraph 4.2). Use only one of the interfaces at a time. The two interfaces share a common set of commands described in Paragraph 4.3. For further information on RS-485 Mainframe Control Bus Operation, see Appendix C. 4.1.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.1.2 IEEE-488 Command Structure The Model 622/623 supports several command types. There are three groups of commands: 1. Bus Control – see Paragraph 4.1.2.1. a. Universal (1) Uniline (2) Multiline b. Addressed Bus Control 2. Common – see Paragraph 4.1.2.2. 3. Interface and Device Specific – see Paragraph 4.1.2.3. 4.1.2.1 Bus Control Commands A Universal Command addresses all devices on the bus.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.1.3.1 Status Byte and Service Request Enable Registers The Status Byte Register consists of a single data byte containing seven bits of MPS status information. STATUS BYTE REGISTER FORMAT 7 6 5 4 3 2 1 0 Bit 128 64 32 16 8 4 2 1 Weighting SDR SRQ ESB OVP ERR RSC LIM ODR Bit Name If the Service Request is enabled, any bits that are set cause the MPS to pull the SRQ management low to signal the BUS CONTROLLER.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual The Standard Event Status Enable Register enables any of the Standard Event Status Register reports. The Standard Event Status Enable command (*ESE) sets the Standard Event Status Enable Register bits. Set a bit to enable its function. To set a bit, send the *ESE command with the bit weighting for each bit to set added together. See the *ESE command for further details.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.1.5 Notes On Using the IEEE Interface • The term "free field" indicates a floating decimal point that may be placed any appropriate place in the string of digits. • [term] indicates where the user places terminating characters or where they appear on a returning character string from the MPS. • To chain commands together, insert a semi-colon, comma, or blank space between them.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual National Instruments GPIB0 Configuration Primary GPIB Address ..................→0 Secondary GPIB Address .............NONE Timeout setting..............................10sec ↑ Select the primary GPIB address by using the left and right arrow keys. This address is used to compute the talk and listen addresses which identify the board or device on the GPIB. Valid primary addresses range from 0 to 30 (00H to 1EH). Terminate Read on EOS ..
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.2 SERIAL I/O INTERFACE RS-232C is a standard of the Electronics Industries Association (EIA) and one of the most common interfaces between a computer and electronic equipment. The Customer supplied computer must have a Serial Interface port. The MPS Serial Interface complies with the electrical format of the RS-232C Interface Standard.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.2.1 Serial Interface Hardware Configuration Below is a technical description of the 6224 option card for the Serial Interface configuration. (Note: See Appendix C for Serial Interface on CMP.) Table 4.2 defines communication parameters. Terminators are fixed to Carriage Return (CR) and Line Feed (LF). The serial interface connector is a standard 6-wire RJ-11 (telephone) jack.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.2.4 Notes On Using The Serial Interface • To chain commands together, insert a semi-colon (;) between them. Multiple queries cannot be chained. • Queries use the same syntax as the associated setting command followed by a question mark (?). They usually return the same information that is sent. • Add a query to the end of a command string if the controller must return information.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.3 SUMMARY OF IEEE-488/SERIAL INTERFACE COMMANDS Below is an alphabetical list of IEEE-488/Serial Interface commands consisting of Operational Commands (Paragraph 4.3.1), Interface Commands (Paragraph 4.3.2), Ramping Commands (Paragraph 4.3.3), Current Zero Commands (Paragraph 4.3.4), Current Step Limit Commands (Paragraph 4.3.5), Computed Field Commands (Paragraph 4.3.6), and Common Commands (Paragraph 4.3.7).
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.3.1 Operational Commands Description Below is a list of MPS Operational Commands which configure the various functions. ERR? Error Status Query Input: ERR? Returned: [OVP] [RI] [STEP] Remarks: Returns 0 if the error is inactive or 1 if it is active. Returns three characters plus up to two terminators.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual OVP? Overvoltage (Quench) Protection Circuit Status Query Input: OVP? Returned: 0 if the circuit is inactive, or 1 if it is active. Remarks: One character plus up to two terminators are returned. RES? Resolution Query Input: RES? Returned: 0 for low resolution or 1 for high resolution. (This command maintains compatibility with older MPS versions.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.3.2 Interface Commands Description The MPS Interface Commands below help configure IEEE-488 interface compatibility for a variety of computer equipment. END Programs MPS Interface EOI (End Or Identify) Status Input: END [status] where [status] = 0 to enable the EOI, or 1 to disable it. Remarks: When enabled, the hardware EOI line becomes active with the last byte of a transfer. Not supported by Control Bus.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.3.3 Ramping Commands Description The following MPS Ramping Commands configure the various functions of the ramping features. RAMP Programs Ramp Segment Parameters Input: RAMP[segment],[initial ramp current],[final ramp current],[ramp rate],[00],[--:--:--:--] where: [segment] = 1. (Future updates will allow up to nine segments.) [initial ramp current] = 0 and ±50 A (620), 0 and ±125 A (622), 0 and ±155 A (623), or 0 and ±72 A (647).
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.3.4 Current Zero Commands Description The following MPS commands configure the various functions of the current zero features. IMODE? Current Programming Mode Query Input: IMODE? Returned: 0 if I MODE switch is set to EXT, or 1 if set to INT. Remarks: Returns one character plus up to two terminators. When multiple MPS units are present, the current programming mode of MPS No. 1 is reported.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.3.5 Current Step Limit Commands Description The following MPS commands configure the various functions of the current step limit features. ISTP Programs Output Current Step Limit Input: ISTP [step limit] where [step limit] = a value between 0 and +999.9900. Remarks: Truncates the value to the 0.001 place. The initial condition is +000.000 A. The step limit is forced to a plus. Control Bus inputs 4 places, display rounds to 0.01 or 0.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.3.6 Computed Field Commands Description The MPS can also display Computed Field rather than current. This is useful with Superconducting magnets because there is a linear relationship between the current and actual field to a reasonable degree of accuracy. This feature is not to be confused with the field as measured with the Model 6226 Liquid Helium Level and Gaussmeter Input Card.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.3.7 Common Commands Description The MPS Common Commands below are input/output commands defined by the IEEE-488 standard and shared with other instruments complying with the standard. Common commands begin with “*”. *CLS Clear Status Register Command Input: *CLS Returned: Nothing. Remarks: Clears the Status Register, but not the instrument.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual *IDN? Identification Query Input: *IDN? Returned: Manufacturer, Model Number, Model Serial Number, Firmware Date. Remarks: Returns seventeen characters plus up to two terminators. Example: LSCI,622,0,120193[term] *OPC Operation Complete Status Input: *OPC Returned: Nothing. Remarks: Causes the MPS to set an update cycle counter to 2.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual *SRE Enables Status Reports In The Service Request Enable Register Input: *SRE [bit weighting] where [bit weighting] = the sum (000 to 255) of bit weighting of each bit to be set. See the discussion on registers and below. Remarks: Each bit is assigned a bit weighting. See the format of the Status Byte Register (given below) to see weighting and register placement of bits. See the register section following the Common Command Table.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual CHAPTER 5 ERROR MESSAGES AND TROUBLESHOOTING 5.0 GENERAL This chapter covers Software Error Messages (Paragraph 5.1), Factory Default Settings (Paragraph 5.2), Calibration Procedure (Paragraph 5.3), Performance Test (Paragraph 5.4), Rear Panel Connectors Definition (Paragraph 5.5), IEEE-488 Connector Definition (Paragraph 5.6), and Serial Interface Cable and Adapters (Paragraph 5.7).
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual No delay is allowed (CAL AND ID switch 7 OFF, down) and multiple MPS operation (CAL AND ID switch 4 ON, up) must be selected. After the load discharges, turn OFF all units to reset. The MPS displays the OVP error message: OVERVOLTAGE PROTECTION: FAULT OR RI DETECTED. OVP IS ENABLED AND OUTPUTS ARE DESABLED LOAD MUST BE DISCHARGED AND ALL UNITS TURNED OFF TO RESET. OUTPUTS: +1.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual High AC (HI AC) Detected Output Inhibit Any time the AC line rises above 120% of the nominal line selected, the MPS turns off the front panel circuit breaker and enters AC Loss Mode. This halts excessive utility voltages to internal circuitry.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 5.2 Factory Default Settings Below is a list of factory-presets. To reinitialize the MPS to factory presets at any time, hold the Esc key for about 15 seconds. NOTE: If the MPS is part of a superconducting magnet system, the system supplier may change some of the parameters below to optimize MPS operation to the superconducting magnet it works with. Automatic Mode Screen MGT START: 0.000A MGT END: 0.000A MGT RATE: 1.000A/S PERS RATE: 1.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 5.3 CALIBRATION NOTE: Calibration is only as accurate as the current monitor shunt. The factory uses a current monitor shunt rated at 0.02% accuracy. Shunt manufacturers typically stock accuracy values of 0.25% or better. To use a different value, adjust readings given in the procedure. 1. Equipment requirements for MPS calibration: a. Current monitor shunt, 100 mV output at 100A (1 milliohm), 0.02% accurate. b.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 17. Send IZER to force output current to 0 amps. Verify a DVM reading of 0V ±0.01V. Allow MPS output to settle for 2 minutes. 18. Convert DVM voltage reading to current. A reading of +0.000345V equals +0.345A. Send actual current using CALZ+xxx.xxxx. If actual current is +0.345 amps, send CALZ+0.3450. The MPS determines the zero current calibration constant. 19.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Output Voltage Verification 5. From the MPS front panel, select the Instrument Setup (INSTR. SETUP) menu and change compliance voltage to 5 V. Press the Normal Display key to return to the Normal Display screen. 6. Set output current to +1 A. Use the DVM to read the voltage across the MPS unit(s) output terminals. The reading should be +5 V ±0.3 V. 7. Set output current to 1 A. The DVM should read 5 V ±0.3 V. 8. Turn OFF MPS.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 5.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 5.6 IEEE-488 INTERFACE CONNECTOR (WHEN MODEL 6224 OPTION IS PRESENT) Connect to rear MPS IEEE-488 Interface connector with cables specified in the IEEE-488-1978 standard document. The cable has 24 conductors with an outer shield. The connectors at each end are 24-way Amphenol 57 Series (or equivalent) with piggyback receptacles to daisy-chain multiple devices.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 5.7 SERIAL INTERFACE CABLE AND ADAPTERS 1 2 TxD YELLOW Gnd Gnd GREEN RED RxD BLACK 1 2 3 4 5 6 3 4 5 6 To aid in Serial Interface troubleshooting, the figures below provide wiring information for the cable assembly and the two mating adapters. C-MPS-5-4.eps Figure 5-4.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual CHAPTER 6 OPTIONS AND ACCESSORIES 6.0 GENERAL This chapter covers MPS options and accessories: Model 6224 IEEE-488/Serial Interface installation (Paragraph 6.1), Model 6226/6476 Liquid Helium Level and Gaussmeter Input Card (Paragraph 6.2), Model 6228 Persistent Switch Heater Output (Paragraph 6.3), Model 6228-2 Persistent Switch Heater Output (Paragraph 6.4), and Accessories (Paragraph 6.5). 6.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Below are specifications for the Model 6226/6476 Liquid Helium Level and Gaussmeter Input Card: Liquid Helium Level: Probe Type: NbTi Superconducting Filament Sample Period: Fixed at 5 seconds Number of Inputs: 1 four lead measurement Maximum Resistance: 428 Ω Nominal Excitation Current: 70 mA Display Resolution: 1%, 0.1 inch, 0.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Locate the probe in a cavity that is 0.003 inch wider and 0.01 inch longer than the substrate, and with a depth the same or slightly greater than the thickness of the package. Tack the leads outside the slot with GE-7031 varnish or other similar substance. Sparingly apply the mounting substance to the corners or a dot on each side of the sensor to hold it in place. Avoid applying mounting substance on top of the sensor.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 6.2.5 LHe Level Access liquid helium level and field monitoring from the MPS front panel. Press Function Menu and then Next Menu to display Function Menu 2. If the Model 6226/6476 Option is not present, appears next to LHe LEVEL and FIELD and associated function keys are ignored. 6.2.5.1 OUTPUTS ONLY 2/3 LHe LEVEL FIELD PSH SETUP LHe Level Operation Press the LHe LEVEL Function key to display the Liquid Helium Level screen.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 6.2.5.2 Field Probe Setting and Calibration Press Function Menu and then Next Menu to display Function Menu 2. Press the FIELD Function key to display the Field screen to the right. FIELD PROBE SETTING: ¤UNITS : kG ¥ CALIBRATE PROBE : + 0.800 :¥TO CALIBRATE mV/kG FIELD PROBE SETTING: ZERO RDG UNITS: T or kG Field Units. The Data Entry up or down arrows scroll between the units: T (tesla) or kG (kilogauss). The default is kG.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Look up the RREF/R(T) in Table 6-2 at the temperature of the sensor during measurement. Use the equation: FG Ω IJ effective = Rb g H LK L T active L R OP ×M MN Rb g PQ Table 6-2. NbTi Filament Resistance Values REF Temp. (K) T where Lactive is the sensor length (line 2). Enter the computed value in line 4 manually. Figure 6-1. NbTi Filament Resistance Chart 6.2.7 305.15 300.15 299.15 298.15 297.15 296.15 295.15 294.15 293.15 292.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual IBS? Magnetic Field Summary Query Input: IBS? Returned: [IOUT], [BFLD], [STB] Remarks: Returns 23 characters plus up to two terminators. LALM Program Level Alarm Input: LALM [alarm] where [alarm] is the level value between 0 and ±999.9 that activates the alarm. The value is truncated (not rounded) to the tenths place. Remarks: The initial condition is 0. The alarm value uses the existing units. Conversion is made if units are changed.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual LUNI? LHe Level Units Query Input: LUNI? Returned: % for percentage, E for English units (inches), or M for metric units (centimeters) Remarks: Returns one character plus up to two terminators are returned. PER Program Sample Period Input: PER [hours]:[minutes] where [hours] = 0 to 23, and [minutes] = 0 to 59. Remarks: Programs the sample period in hours and minutes.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 6.3 MODEL 6228 AND 6228-8MUX PERSISTENT SWITCH HEATER OUTPUT The Model 6228 Persistent Switch Heater (PSH) Output Option provides a variable 0-124 mA DC output in 4 mA increments. The output compliance is an 8 volt minimum and the load can be up to 100 ohms. An MPS front panel annunciator indicates PSH output current status.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual When PSH is ON, the MPS compares the present current setting with the current setting stored when PSH was OFF. If the two do not match, the MPS sounds the alarm for ½ second and displays: Press a Data Entry up or down arrow to turn ON the PSH. If Esc is pressed, or no key is pressed for approximately 30 seconds, the PSH is not turned ON. 6.3.3 CAUTION! SETTING NOT SAME AS SAVED VALUE HEATER CURRENT: 50 mA 10.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 3. The selected current multiplied by the heater resistance (e = i × r) must be less than 15 Vdc for the MPS to accurately determine compliance of the switch heater (open resistance). Examples: A 100 ohm heater resistance set for 100 mA yields 10 volt compliance (Ohm's Law). This is greater than the required 0.75 Vdc and yet less than 15 Vdc. This allows proper performance. A 10 ohm heater resistance set for 50 mA yields 0.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual PSHS? PSH Summary Query Input: PSHS? Returned: [PSH][PSH status][PSH compliance][current value][command status] where: [PSH] = 0 if PSH is present, or 1 if PSH is not present, [PSH heater status] = 0 if heater is OFF, or 1 if it is ON, [PSH compliance] = 0 if PSH is under compliance or 1 if it is over. [current value] = up to three characters which give the current value [command status] = 0 if the command status is OFF, or 1 if it is ON.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 6.4.1 Model 6228-2 Remote Operation Commands IPSHB Program PSH Current Input: IPSHB [current] where [current] = a value from 0 to 125 mA Remarks: The initial condition is 0 mA. Current can be set from 0 to 125 mA but will actually be set in 4 mA increments. IPSHB? PSH Current Query Input: IPSHB? Returned: A number between 0 and 125. Remarks: Returns three characters plus up to two terminators.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 6.5 ACCESSORIES Accessories are devices that perform a secondary duty as an aid or refinement to the primary unit. Below are MPS accessories. MODEL NUMBER 106-720 Terminal Block Mate, 18-Contact. 106-726 Detachable Power Connector. 106-730 Terminal Block Mate, 4 contact. 115-010 Detachable 240 VAC Line Cord (Great Britain). 115-011 Detachable 120 VAC Line Cord (USA, Canada). 115-012 Detachable 220 VAC Line Cord (Europe, SA).
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual APPENDIX A UNITS FOR MAGNETIC PROPERTIES Conversion from CGS to SI Units Quantity Symbol Gaussian a & CGS emu Magnetic flux density, Magnetic induction B gauss (G) Magnetic Flux φ maxwell (Mx), G•cm Magnetic potential difference, magnetomotive force U, F gilbert (Gb) Conversion b Factor, C d 10 2 tesla (T), Wb/m -4 weber (Wb), volt second (V•s) 10/4π ampere (A) 3 A/m H (Volume) magnetizationg (Volume) magnetization M
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual This Page Intentionally Left Blank A-2 Magnetic Units
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual APPENDIX B MAINFRAME CONTROL BUS OPERATION B1.0 GENERAL There are seven elements to the Model 622/623 Mainframe Control Bus operating instructions: Control Bus Serial Interface Specifications (Paragraph B2.0), Control Bus Serial Interface Connector (Paragraph B3.0), Control Bus Serial Interface Configuration (Paragraph B4.0), Selecting the Control Bus Serial Interface Address (Paragraph B5.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual B4.0 CONTROL BUS SERIAL INTERFACE CONFIGURATION Configure the control bus serial interface for either RS-232C or RS-485 communications with DIP switches on the Communications Processor Board (CMP). The CMP plugs into the Mainframe rear panel. The standard control bus serial interface configuration is RS-485. Use the procedure below to change or verify the serial interface configuration. 1. Turn off Mainframe and unplug the power cord. 2.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual B6.0 CONTROL BUS SERIAL INTERFACE OPERATION The host computer initiates the serial interface link and transmits either a command or a query to the Mainframe. The Mainframe stores the characters in a buffer until the carriage return (CR), line feed (LF) terminator sequence. After receiving the terminators, the Mainframe responds appropriately to a query, if present, and stores the new input parameters.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual B7.0 CONTROL BUS SERIAL INTERFACE SAMPLE PROGRAM The following PC program is an interactive program that prompts the user for a Mainframe command and displays the Mainframe response. The command must include a query for the Mainframe to respond. 'This QuickBasic 4.0 program is for an IBM PC or compatible. Enter the 'Mainframe command at the prompt. The Mainframe response then displays. '"END" exits the program.
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Table B-1 MPS Mainframe Control Bus Remote Command Summary Input Command Query *CLS *ESE – – *SRE – – MODE TERM I, ISET V, VSET – – – IMAX RAMP1 SEG RMP VCAL ICAL CALPL CALMN VZER IZER CALZ ZI ZIS – – – – *ESE? *ESR? *IDN? *SRE? *STB? *TST? MODE? TERM? I?, ISET? V?, VSET? IOUT? VOUT? ? IMAX? RAMP? SEG? RMP? – – – ISTP ISTPS STEPR1 OVP? ERR? RI? ISTP? ISTPS? – – ZI? ZIS? IMODE? VMODE? RES? Mainframe Control Bus Operation Function C
Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Table B-2 Additional MPS Mainframe Control Bus Remote Commands Input Command Query – ADR Mainframe address. Multidrop address 0-32 available. Commands sent must have the address as the first character. Query response will be “00” thru “32.” LOC LOCK UNLOCK REM CMD Mainframe Programming Status. Query response will be the same as what is programmed. There is no real change in Mainframe status.