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Fig. 51 — Typical Wye-Delta Unit Mounted Starter Wiring Schematic
LEGEND
1M, 2M — Main Compressor Contactors
CB — Circuit Breaker
CR — Control Relay
CT — Current Transformer
DS — Disconnect
GF — Ground Fault
GFR — Ground Fault Relay
H1, H2 — Power Transformer Input
Terminal
HPS — High-Pressure Switch
J—Module Connector
L1, L2, L3 — 3-Phase Line Terminals
NC — Normally Closed
OL — Overload
OS1, OS2,
OS3
— 3-Phase Current Power
Source to Oil Pump
PMR — Phase Loss Reversal Relay
PMRVR — Phase Loss, Phase Reversal,
Overvoltage, Undervoltage Relay
POT — Potentiometer
PR — Pilot Relay
S—Compressor Motor Start Contactor
SMM — Starter Management Module
ST — Shunt Trip
T—Motor Terminal
TB — Terminal Board
TR — Transition Resistor
TRFP — Transition Resistor Fault Protector
X—Variable Number
X1, X2 — Power Transformer Output Terminal
Dry Contact
96