Step 4
(from Step 3a)
1. Set all circuit breaker switches in both circuit breaker panels in your rack to the
Off position.
2. Carefully label the device power cables and return ground cables with device,
polarity, and circuit breaker position information.
3. Disconnect all of the device and drawer -48 V DC power cables and positive
return ground cables from the 20A/10A circuit breaker panel. Tape the ends of
the disconnected cables to insulate them and lay them aside.
4. Set all circuit breaker switches in the 20A/10A circuit breaker panel to the On
position.
5. As in Step 3a, measure for -40 to -60 V DC between the -48 V DC supply and
positive ground return connectors for each of the eight circuit breakers in the
20A/10A circuit breaker panel
Is the voltage between -40 and -60 V dc at each position?
NO Replace the 20A/10A circuit breaker panel.
YES Go to Step 5.
Chapter 5. Maintenance Analysis Procedures (MAPs) 5-21
To Next Page
Loading...
