4
208/240V - 3 Phase - 50/60 Hz
GROUND FOR
100/120 VAC
ONLY
208/240V - 3 Phase - 50/60 Hz
Typical 4-Wire Wiring – 208/240 Oil Pressure Safety Control Power Common to Compressor
*
Optional Current Sensing Relay
in Series with N/T2 line
for compressors with internal line break motor protectors.
(Prevents oil pressure safety control from tripping when internal
line-break motor protector trips.)
FIGURE 8
Typical New Copeland 3-Wire Oil Pressure Safety Control Wiring
This circuit eliminates nuisance trips of the OPSC from “sneak” voltages on the “T” side of the contactor from auxiliary
devices connected from the “T” side to “L” or neutral of the contactor, or minor voltage-leakage paths from the compressors
connections/winding to ground.
*
Optional Current Sensing Relay
in Series with N/L1 line
for compressors with internal line break motor protectors.
(Prevents oil pressure safety control from tripping when internal
line-break motor protector trips.)
FIGURE 6
Typical 3-Wire Separate Power Source
NOTE: Contactor Coil, Alarm and Normal Light must be same voltage as the control circuit voltage.
*
Optional Current Sensing Relay
in Series with N line
for compressors with internal line break motor protectors.
(Prevents oil pressure safety control from tripping when internal
line-break motor protector trips.)
FIGURE 7
3 Phase - 50/60 Hz
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