GE Multilin L60 Line Phase Comparison System 3-113 HARDWARE 3.2 WIRING33.2.2 DIELECTRIC STRENGTHThe dielectric strength of the UR-series module hardware is shown in the following table:Filter networks and transient protection clamps are used in the hardware to prevent damage caused by high peak voltagetransients, radio frequency interference (RFI), and electromagnetic interference (EMI). These protective components canbe damaged by application of the ANSI/IEEE C37.90 specified test voltage for a period longer than the specified one min-ute.3.2.3 CONTROL POWERCONTROL POWER SUPPLIED TO THE RELAY MUST BE CONNECTED TO THE MATCHING POWER SUPPLYRANGE OF THE RELAY. IF THE VOLTAGE IS APPLIED TO THE WRONG TERMINALS, DAMAGE MAYOCCUR!The L60 relay, like almost all electronic relays, contains electrolytic capacitors. These capacitors are wellknown to be subject to deterioration over time if voltage is not applied periodically. Deterioration can beavoided by powering the relays up once a year.The power supply module can be ordered for two possible voltage ranges, with or without a redundant power option. Eachrange has a dedicated input connection for proper operation. The ranges are as shown below (see the Technical specifica-tions section of chapter 2 for additional details):• Low (LO) range: 24 to 48 V (DC only) nominal.• High (HI) range: 125 to 250 V nominal.The power supply module provides power to the relay and supplies power for dry contact input connections.The power supply module provides 48 V DC power for dry contact input connections and a critical failure relay (see theTypical wiring diagram earlier). The critical failure relay is a form-C device that will be energized once control power isapplied and the relay has successfully booted up with no critical self-test failures. If on-going self-test diagnostic checksdetect a critical failure (see the Self-test errors section in chapter 7) or control power is lost, the relay will de-energize.For high reliability systems, the L60 has a redundant option in which two L60 power supplies are placed in parallel on thebus. If one of the power supplies become faulted, the second power supply will assume the full load of the relay without anyinterruptions. Each power supply has a green LED on the front of the module to indicate it is functional. The critical fail relayof the module will also indicate a faulted power supply.Table 3–1: DIELECTRIC STRENGTH OF UR-SERIES MODULE HARDWAREMODULETYPEMODULE FUNCTION TERMINALS DIELECTRIC STRENGTH(AC)FROM TO1 Power supply High (+); Low (+); (–) Chassis 2000 V AC for 1 minute1 Power supply 48 V DC (+) and (–) Chassis 2000 V AC for 1 minute1 Power supply Relay terminals Chassis 2000 V AC for 1 minute2 Reserved N/A N/A N/A3 Reserved N/A N/A N/A4 Reserved N/A N/A N/A5 Analog inputs/outputs All except 8b Chassis < 50 V DC6 Digital inputs/outputs All Chassis 2000 V AC for 1 minute7 G.703 All except 2b, 3a, 7b, 8a Chassis 2000 V AC for 1 minuteRS422 All except 6a, 7b, 8a Chassis < 50 V DC8 CT/VT All Chassis 2000 V AC for 1 minute9 CPU All Chassis 2000 V AC for 1 minuteCAUTIONNOTE
