Model 648 Datasheet
Contents
1. a Low noise power supply for sil akKeShore 7 and 10 inch electromagnets WE Bipolar linear 4 quadrant output F135 A 275V 9 1 kW M Can be modulated to frequencies up to 0 17 Hz at 135A Low noise E 1mAof programmed current resolution E Analog programming and IEEE 488 and USB interfaces M Built in fault protection Introduction 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 operation It is capable of supplying 135 A 75 Vto anominal 0 5 Q 0 5 H load and the output can be modulated from an external source to frequencies up to 0 17 Hz at 135 A The Model 648 is built to last with a rugged design integrated fault protection and a simple 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 LUG COVER IS NOT WATER 72. transitions through zero without discontinuities a www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 fax 614 818 1600 e mail info lakeshore com Model 648 Electromagnet Power Supply Output programming The Model 648 output current is programmed internally via the keypad or the computer interface externally by analog programming input or by the sum of the external and internal settings External programming via analog input signal provides analog resolution The Model 648 generates extremely smooth and continuous ramps the digitally generated constant current ramp rate is variable between 0 1 mA s and 50 000 A s To ensure a smooth ramp rate the power supply updates the high resolution DAC 12 3 times per second Output reading The Model 648 provides high resolution output current readings that reflect the actual current in the magnet and have a resolution of 1 mA The output voltage reading reports the voltage at the output terminals with a resolution of 1 mV All output readings can be prominently displayed on the front panel and read over the computer interface Protection The Model 648 provides built in protection against short circuit open circuit line loss low 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 shoul
3. 4 mm W x 1168 mm D x 1219 mm H 36 in x 46 in x 48 in Shipping weight 281 kg 620 Ib Ambient temperature 15 C to 35 C at rated accuracy 5 C to 40 C at reduced accuracy Humidity Non condensing Warm up 30 min at output current setting Approvals CE mark low voltage compliance to EN61010 1 EMC compliance to EN61326 1
4. 6L SL 2 0 ji MINIM gal min 552 kPa 80 MAXIM 4 Se The only cooling water junctions in the power supply are on the outside eliminating internal water leakage 2 safety interlocks ensure that cooling water is always flowing to the supply while operating Magnet water can also 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 studies magnetic hysteresis tests susceptibility measurements Hall effect studies spin magnetic resonance demonstrations and biological tests Output architecture The low electrical noise design of the Model 648 makes it the ideal power supply for use with large electromagnets in high precision laboratory settings ensuring greater resolution and finer detail in data taken during highly sensitive measurements Since low noise is critical to measurement systems the Model 648 implements both a linear design and bipolar architecture Linear magnet power supplies have several advantages over switch mode power supplies primarily smooth field generation that is nearly free from offending electromagnetic signatures The bipolar 4 quadrant operation required to safely operate an inductive load provides clean
5. TL low or contact closure to enable output jumper required if unused Connector Shared 8 pin detachable terminal block connector Emergency stop and inhibit switches not included General Line power Power 15 5 kVA max Voltage and current 200 VAC 10 41 A phase 208 VAC 10 40 A phase 220 VAC 10 38 A phase 230 VAC 10 37 A phase 380 VAC 10 23 A phase 400 VAC 10 21 A phase 415 VAC 10 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 delt Oe Connector a el keShor GC Line voltage must be specified at time of order but is field reconfigurable cable from power supply to facility power not included Lake Shore Cryotronics Inc N 575 McCorkle Boulevard Cooling water Westerville OH 43082 8888 USA Flow rate 7 6 L 2 0 gal min minimum Tel 614 891 2244 Maximum pressure 552 kPa 80 psi ery Pressure drop 159 kPa 23 psi at 7 6 L 2 0 gal min minimum for power supply and Fax 614 818 1600 mandatory flow switch e mail info lakeshore com Temperature 15 C to 30 C non condensing www lakeshore com Connection Two 12 7 mm 0 5 in hose barbs CAUTION Internal condensation can cause damage to the power supply Enclosure type Custom 19 in rack cabinet Size 559 mm W x 673 mm D x 1054 mm H 22 in x 26 in x 42 in Weight 225 kg 495 Ib Shipping size 91
6. am through rear panel can be summed with internal current setting Limits Internally clamped at 10 1 V and bandwidth limited 3 dB at 40 Hz two pole low pass filter Connector Shared 15 pin D sub Readings Output current Resolution 1 0 mA Accuracy 20 mA 0 05 of rdg Update rate 2 5 rdg s display 10 rdg s interface Output voltage at supply terminals Resolution 1 0 mV Accuracy 10 mV 0 05 of rdg Update rate 2 5 rdg s display 5 rdg s interface Front panel Display type 8 line by 40 character graphic vacuum fluorescent display module Display readings Output current output voltage and internal water temperature Display settings Output current and ramp rate Display annunciators Status and errors LED annunciators Fault Compliance Power Limit Ramping Remote Audible annunciator Errors and faults Keypad type 20 full travel keys Keypad functions Direct access to common operations menu driven setup Power Green flush ON and red extended OFF push buttons Interface IEEE 488 2 interface Features SH1 AH1 T5 L4 SR1 RL1 PPO DC1 DTO CO 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 LabVIEW driver consult Lake Shore for availa
7. bility 3 ee www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 fax 614 818 1600 e mail info lakeshore com Output current monitor Sensitivity 7 V 135 A Accuracy 1 of full scale Noise 5 mV RMS Source impedance 20 Q Connector Shared 15 pin D sub Ordering Information Part number Description Output voltage monitor Sensitivity 7 V 70 V Accuracy 1 of full scale Noise 2 mV RMS Source impedance 20 Q Connector Shared 15 pin D sub Accessories included Power supply cooling water Remote enable input TTL low or contact closure to enable output used for mandatory 1 gal min flow switch included Connector 2 pin detachable terminal block connector Valve power output 24 VAC at 1 5 A maximum automatic or manual control Connector 2 pin detachable terminal block connector Water valve optional Magnet cooling water Accessories available Remote enable input TTL low or contact closure to enable output jumper required if unused Valve power output 24 VAC at 1 5 A maximum automatic or manual control Connector Shared 4 pin detachable terminal block connector Flow temperature switch and water valve not included All specifications are subject to change without notice Auxiliary Emergency stop Requires 1 A 24 VAC normally closed NC contact to enable power up jumper required if unused Fault output Relay with normally open NO or normally closed NC contact 30 VDC at 1 A Remote enable input T
8. d low resistance and high line conditions exist The Model 648 protects itself if operated into resistances outside of nominal limits By limiting current output it will safely operate into a shorted load and operate safely into high resistance loads by limiting voltage output The Model 648 is also protected against power loss under full operation and nominal magnet load Both low and high power line conditions are reported on the front panel display compliant to both the low voltage directive and the electromagnetic compatibility EMC directive which includes the radiated emissions requirements Maximum output current vs load resistance lt x 120 Limited by internal 2 power dissipation T an Power limit 4000 W 2 380 E Limited by internal z design voltage 60 Compliance limit 75 V 40 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 0 Load resistance Ohms Interfaces Model 648 The Model 648 includes both parallel IEEE Specifications 488 and universal serial bus USB computer interfaces that provide access to operating data stored parameters and remote control Output of all front panel operating functions The Type Bipolar 4 quadrant DC current source USB interface emulates an RS 232C serial Current generation Fully linear regulation with digital port at a fixed 57 600 baud rate but with setting and analog control the physical connections of a USB This Current range 135 A allows you to d
9. ownload firmware upgrades Compliance voltage DC 75 V ensuring your supply is using the most Power 9 1 kW nominal current firmware version with no need for Nominal load 0 5 Q 0 5 H any physical changes The Model 648 also Maximum load resistance 0 55 Q for 135 A DC operation at 10 to 5 line voltage Minimum load resistance 0 41 Q for 135 A DC operation at 5 to 10 line voltage Load inductance range 0 H to 1 H provides two analog monitors for output current and voltage e Current ripple 10 mA RMS 0 007 at 135 A into Display and keypad nominal load frequency and its harmonics Temperature coefficient 50 ppm of full scale C Line regulation 75 ppm of full scale 10 line change Stability 1 h 2 mA h after warm up internal setting output current and output voltage readings simultaneously Five front panel LEDs provide quick verification of instrument status including rampin compliance fault Stability 24 h 10 mA 24 h typical internal setting power limit and computer interface mode dominated by temperature coefficient and line regulation Error conditions are indicated on the main Isolation Differential output is optically isolated from display along with an audible beeper The chassis to prevent ground loops most common functions of the power supply Slew rate 50 A s into nominal load dominated by are accessed using a single button press magnet characteristics 100 A s maximum into a resis
10. tive load Settling time lt 1 s for 10 step to within 1 mA of output into nominal load 3 year mare nty and Harmonic distortion lt 0 1 Hz at 135 A sine wave technical support into resistive load lt 0 02 THD lt 10 Hz at 10 A sine wave into resistive load lt 0 30 THD The Model 648 is supported by a 3 year Attenuation 0 5 dB at 10 Hz standard warranty our confirmation of Protection Short circuit line loss low line voltage high quality and commitment for the long term line voltage output over voltage output over current and Our physicists understand your applications over temperature and measurements and provide Connector Two lugs with 8 64 mm 0 34 in holes for Support throughout your M8 or 5 16 in bolts decision making process and beyond the sale Output Programming Internal current setting Resolution 1 0 mA 20 bit Settling time 600 ms for 1 step to within 1 mA of internal setting Accuracy 20 mA 0 05 of setting Operation Keypad computer interface Protection Programmable current setting limit Internal current ramp Ramp rate 0 1 mA s to 50 000 A s compliance limited Update rate 12 3 increments s Ramp segments 5 Operation Keypad computer interface Protection Programmable ramp rate limit External current programming Sensitivity 10 V 135 A Resolution Analog Accuracy 20 mA 1 of setting Input resistance 20 kQ differential 50 KQ common mode Operation Voltage progr
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