Alpha Technologies CFR Redundant Control Unit - Manual (Page 13)

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3 Operation
3.1 RCU Start–Up and Test Procedure
Switch the Input 1 circuit breaker ON.
The Input 1 LED lights, showing the return of primary power. The RCU transfers back to
Input 1 after about 30 seconds, after the voltage and frequency stabilizes. When done, the
Contactor 1 LED turns ON.
Turn ON
Input 1 circuit breaker
Contactor 1 LED Input 1 LED
Figure 3.3
Return Primary Power
1
STEP 3: Restore Primary Power
Switch the Input 2 circuit breaker OFF.
The Input 2 LED on the front panel turns OFF, indicating the loss of secondary power.
There should be no transfer or any other change in the status of the RCU.
Switch the Input 2 circuit breaker ON to return to normal status.
STEP 4: Test Secondary Power
Turn OFF
Input 2 circuit breaker
Figure 3.4
Test Secondary Power
Input 2 LED
1
2