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HVACR318 – Advanced Refrigeration
Three PhaseThree Phase Compressors
Three Phase Motors
3 PHASE VOLTAGE– Phase A = L1– Phase B = L2– Phase C = L3
3 PHASE VOLTAGE Phase A = L1 Phase B = L2 Phase C = L3
VOLTAGE
L1 VOLTAGE
L2 VOLTAGE
L3 VOLTAGE
TIME
3 PHASE COMPRESSORS and MOTORS
3 PHASE MOTOR and CONTROL CIRCUIT
MAGNETIC MOTOR
STARTER
L1
T2L2
T3
T1L1
L3
M1
M1 OL OL OL
L2
L3
3 PHASE MOTOR CIRCUIT
N
3 PHASE 240 VAC MOTOR
120 VAC CONTROL CIRCUIT
3 PHASE MOTOR WINDINGS and WYE WIRING DIAGRAM
3 PHASE WYE HIGH VOLTAGE WIRING
DIAGRAM
T9 T8
T7
T6 T5
T4
T3 T2
T1
3 PHASE WYE LOW VOLTAGE WIRING
DIAGRAM
T9 T8
T7
T6 T5
T4
T3 T2
T1
3 PHASE DELTA WIRING DIAGRAM
3 PHASE DELTA WIRING HIGH VOLTAGE DIAGRAM
3 PHASE DELTA LOW VOLTAGE WIRING
DIAGRAM
TROUBLESHOOTINGVOLTAGE METER
TROUBLESHOOTINGRESISTANCE (OHM) METER
TROUBLESHOOTINGCURRENT (AMP) METER