Thermo King T-500R Maintenance Manual page 134

Model 50 Control Box Components with High Voltage Cover Removed (T-500R/T-Dairy Only)
Model 50 High Voltage Box Components with High Voltage Cover Removed - UT-Series
Operation
The phase select module will detect missing phases, phase orientation and low voltage on three phase or single phase power.
The Brown, Gray, and Black wires are used to sample the power at L1, L2 and L3 respectively. Operating power from 12 to 24
volts is supplied to the module via the 8 wire and CH wire.
1 2
7 6 5
1. Phase Select Module
2. Overload Relay
3. Base Controller/Interface Board Assembly
(Low Voltage)
4. Evaporator Fan Relay Board (Low Voltage)
5. MCA–Motor Contactor
6. MCB–Motor Contactor
7. Heater Contactor (Optional)
1 2
1. MCB–Motor Contactor
2. MCA–Motor Contactor
4. Overload Relay
5. Phase Select Module
Electrical Maintenance
3 4
ARA1969
4
3
8-14