Lakeshore 620 User Manual
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Lake Shore Model 620/622/623/647 Magnet Power Supply User’s ManualSetup & Connections2-22.4.1 Power and Ground RequirementsThe AC power source for the MPS should be frequency and voltage regulated and isolated from sources thatmay generate Electromagnetic Interference (EMI). The MPS is designed for single-phase 3-wire alternatingcurrent (AC) power; do not use two-wire (without ground) AC power. Lake Shore recommends Ground FaultInterrupter (GFI) and Transient Surge Protection circuitry at the AC source.In areas where AC voltage varies, consider using a constant voltage transformer. For power outages, considerusing an Uninterruptible Power Supply (UPS).CAUTION: Do not attempt to apply electrical power until the MPS is checked for proper line voltagesettings.Factory-preset MPS line voltage requirements allow proper operation at the shipping destination. The linevoltage setting is indicated on the rear panel. Before applying power to the main input power cable, check forcorrect input power settings for the power source voltage.Ground the instrument panels and cabinets. The safety ground provides a true ground path for electricalcircuitry and, in the event of internal electrical faults such as shorts, carries the entire fault current to ground toprotect users from electrical shock. The MPS has a three-conductor power input connector which grounds theMPS chassis when plugged into a 3-wire receptacle.EMI is both a natural and man-made electromagnetic phenomena which, either directly or indirectly, maydegrade electronic system performance. Natural EMI includes thunderstorms, solar disturbances, cosmicrays, etc. Man-made EMI includes fixed and mobile transmitters, high voltage power lines, power tools andappliances, florescent lights, and other equipment containing motors, heaters, etc. Protect the AC source fromEMI. Consider transient surge protectors for lightning protection.2.4.2 MPS Input Power RatingsOperate the Model 620/622/623 from a nominal 100, 120, 200/208, 220, or 240 VAC (–10%, +5%)single-phase AC power source, 50 to 60 Hz. Table 1-1 lists input voltage range and maximum current requiredfor each nominal input.Operate the Model 647 from a nominal 200/208, 220, or 240 VAC (–10%, +5%) single-phase AC powersource, 50 to 60 Hz. Table 1-2 lists input voltage range and maximum current required for each nominal input.A rear panel label indicates MPS factory-preset nominal line voltage. Normally, the line voltage setting is notchanged in the field. Consult the factory to reconfigure the input power.2.4.3 Input Power ConnectionsThe MPS uses a three-prong detachable input power connector (supplied) to mate with the UL/CSA/IECapproved rear panel AC input connector. The user supplies a three conductor power cord rated for at least 85°C operation. For 100 or 120 VAC operation, each conductor must be AWG #14 or larger. For 200/208, 220 or240 VAC operation, each conductor must be AWG #16 or larger. Larger wires may be required to preventexcessive voltage drop in the AC power lines if the unit is located an extended distance from the main ACdistribution terminals.WARNING: For proper circuit breaker protection, mate the wire connected to the “L” terminal of theconnector to the “L” (hot) side of the line and mate the wire connected to the “N” terminal to the “N”(neutral) side of the line. Mate the wire connected to the “GND” terminal to earth ground. Do notoperate this instrument without an adequate ground connection.CAUTION: Before applying power to the MPS, verify that the AC source matches the line voltage listedon the rear panel.NOTE: Make connections to the AC power line in accordance with applicable electrical codes. Theinternational color code for identifying utility supply conductors is green/yellow for earth (“GND”), blue forneutral (N), and brown for line (L). The US and Canadian codes are green for earth (“GND”), white for neutral(N), and black for line (L). |
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