Alpha Technologies CFR Redundant Control Unit - Manual (Page 12)

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3 Operation
3.1 RCU Start–Up and Test Procedure
Figure 3.1
RCU Power Up
2 1
Press the Select 1
contactor switch.
Switch ON both
circuit breakers.
STEP 1: RCU Power Up
WARNING: Before starting, turn OFF the Input 1 and 2 Circuit Breakers and the Load(s).
NOTE: If there is any type of logic or contact failure during the system start-up, test or opera-
tion, the Red Alert LED turns ON.
Switch the Input 1 circuit breaker OFF.
The Input 1 LED on the front panel will go out, showing the loss of primary power. As the
RCU transfers to the secondary power source the Contactor 2 LED turns ON.
NOTE: There will be a five second delay between the transfer from Input 1 to Input 2. This
conforms to the automatic transfer switch safety code.
STEP 2: Test Primary Power
Turn OFF
Input 1 circuit breaker Contactor 2 LED
Figure 3.2
Testing Primary Power
Input 1 LED
1