Lakeshore 620 User Manual
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Lake Shore Model 620/622/623/647 Magnet Power Supply User’s ManualSetup & Connections 2-3Use 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. Position the strain relief, close the cover, and then tighten the cover screws.5. Connect the other end of the power cord to an appropriate AC power source.6. Plug the power cord into the detachable power connector plug on the MPS rear panel.2.5 POWER UPRead and follow instructions in Paragraphs 2.1 thru 2.4.3 and safety recommendations in the Foreword beforeapplying power to the MPS. Do not connect the MPS to the magnet at this point. Short the output terminalstogether with a #4 gauge or larger cable. This protects the magnet against incorrect configurations.Turn on the MPS. It requires approximately 2 seconds for initialization. Initially, all front panel annunciatorscome on and the alarm sounds for a short time. Within 1 second, the Fault and Persistent Switch Heater Onannunciators and the alarm turn off. If the MPS detects a high or low AC line fault, it blinks the front panelFault annunciator and turns off the input circuit breaker. If this occurs, verify that the AC source matches theline voltage listed on the MPS rear panel. The MPS front panel AC On LED lights any time the MPS isconnected to the AC line and the MPS power switch is ON.Initially, the entire display clears and the alarm sounds for a short time. The MPS initializes itself and displaysthe model identification. The Normal Display screen appears with a blinking asterisk indicating each updatewhen the unit is in normal operation.2.5.1 Magnet Cable ConnectionsWARNING: Turn off the AC power before changing any rear panel connections and verify that allconnections are securely tightened before reapplying power.CAUTION: Initially, setup the MPS without connecting it to the magnet. This lessens the chance forinadvertent damage to the load while the user learns MPS operation.Make MPS load connections at the+OUT and –OUT terminals on the rearpanel. These plated copper bus barsaccommodate 1/4 inch mountinghardware. Use load wires heavy enoughto limit the voltage drop to less than 0.5volts per lead. This ensures properregulation and prevents overheatingwhile carrying the output current. Useremote sensing to compensate for anyvoltage drop in the load leads andobtain a more accurate voltage reading.Stranded AWG #4 wire is capable of carrying in excess of 125 amperes. Keep conductor temperature under85 °C for a 35 °C ambient. Table 2-1 lists the ampere capacity and total +OUT and –OUT lead lengths for loadconnections.If connecting multiple loads to the unit, use separate pairs of wires to connect each load to the outputterminals. Cut each pair of connecting wires as short as possible.Table 2-1. Load Wire Lengths and Current CapacityArea Capacity Resistivity Total Lead Length (feet)AWG (mm 2 ) Amperes ΩΩΩΩ/1000 feet 75 A 100 A 125 A0246853.533.621.213.38.4245180135100750.098270.15630.24850.39510.628213585533321101644025—815132—— |
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