Alpha Technologies CFR Redundant Control Unit - Manual (Page 6)

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1 Introduction
1.2 A Tour of the RCU
1.2.2 RCU Interior (Figure 1.3)
Front Panel:
This hinged panel opens downward to allow the operator access to the RCU interior to
configure the input/output voltage, replace fuses or for troubleshooting. Two, 3.15 Amp
fuses are located here.
Contactors:
The primary and secondary contactors.
Sliding Panel:
This panel slides back and forth for access to the RCU’s input, output and alarm terminal
blocks.
Input 1 Terminal Block:
This terminal block is the primary power input.
Input 2 Terminal Block:
This terminal block is the secondary power input.
Output Terminal Block:
This terminal block is the RCU’s output.
Alarm Terminal Block:
This terminal block is the RCU’s alarm connection.
Power Board:
The RCU is configured here for 120, 208 or 240 VAC operation. Two, 500 mA fuses are
located on this board.
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