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Electrical Maintenance
88
Transformer Contactor – TRC
This contactor is energized while running in
electric stand-by and provides the secondary
output from the transformer to the fan motors
(Condenser and Evaporator). This contactor also
provides isolation to the transformer while the
unit runs in diesel operation. This contactor is
electrically interlocked with the Generator
Contactor and BC2.
Battery Charger Contactor 1 – BC1
This contactor is energized while running in
electric stand-by and provides 460 Vac 3 phase
power to the optional battery charger. This
contactor is mechanically and electrically
interlocked with BC2. This contactor is energized
at the same time as TRC.
Battery Charger Contactor 2 – BC2
This contactor is energized while running in diesel
operation and provides 3 phase Vac from the
generator to the optional battery charger. This
contactor is mechanically interlocked with BC1,
and electrically interlocked with TRC and BC1.
Phase Contactor 1 – PC1
Provides non-corrected 3 phase power to the
system. This is controlled by the Phase Select
Module (7EC). This is mechanically interlocked
with PC2.
1.
CC
–
Compressor Motor Contactor
8.
OLH
–
Heater Overload Relay
2.
FB1
–
Fuse Block 1
9.
HC
–
Heater Contactor
3.
GC
–
Generator Contactor
10.
OL
–
Overload Relay (Compressor Motor)
4.
BC1
–
Battery Charger Contactor 1 (460 Vac Only) 11.
PSM
–
Phase Selection Module
5.
BC2
–
Battery Charger Contactor 2 (460 Vac Only) 12.
PC1
–
Phase Contactor 1
6.
TRC
–
Transformer Contactor (460 Vac Only)
13
PC2
–
Phase Contactor 2
7.
FB2
–
Transformer Secondary Fuse Block 2 (460
Vac Only)
Figure 156: High Voltage Box
ARA1909
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