GE PSH23SGNAFBS Series Technical Service Manual

– 13 –High compressor torque enables the compressor to start against high pressure in the sealed system.When power has been disconnected from an operating unit, the high torque will enable the compressorto start immediately upon power restoration.Compressor and sealed system operation is extremely smooth and cool. The compressor exterior maybe room temperature while operating; therefore a running unit may be difficult to detect.To verify that the compressor is running:Disconnect power from the unit and place a hand on the compressor. Reconnect power and feel for avibration when the compressor tries to start. It may take up to 8 seconds before the compressorattempts to start.To determine motor rpm:Measure the frequency of the voltage being applied to the compressor and multiply this number by 30.For example, a frequency measurement of 70 Hz would show a compressor speed of 2100 rpm (30 x70 = 2100).Note: If the compressor fails to start, the inverter will briefly stop voltage output. The inverter will make12 consecutive attempts to start the compressor (once every 12 seconds). If, after 12 attempts, thecompressor has not started, an 8-minute count will occur. After 8 minutes, the inverter will attempt tostart the compressor again. If the compressor starts, normal operation will resume. If the compressorfails to start, the process will be repeated.Removing power from the unit will reset theinverter count. When power is restored, theinverter will attempt to start the compressor within8 seconds.Note:• When ordering a replacement compressor,order both the compressor and inverter.Replace the compressor first. If, aftercompressor installation, the compressor failsto start, replace the inverter.• When servicing the compressor, it is importantto dress the wiring to keep low voltage DCwiring and 120 VAC wiring separate.J4-3 J4-2J3-10BLACKBROWNBLUEBLACKBLUEBROWNORANGEORANGEORANGEPURPLECOMPRESSOR INVERTERTAB 4BROWN10Ω10Ω10ΩLOW VOLTAGE DCCLASS 2 CIRCUITSMAIN CONTROL BOARDACCURRENT-SOURCECIRCUIT BOARDLINE VOLTAGE6-PINCONNECTOR+12 VDCCOMMONGEA01260