Step 8
(from Step 3b)
1. Set all of the circuit breaker switches in both circuit breaker panels to the Off
position.
2. At the terminal strip, disconnect the cables from the terminal strip to the devices
or drawers for every circuit breaker position that was out of range in Step 3b.
Carefully label each pair, tape the ends to insulate the leads, and set the cables
aside.
3. Set the circuit breaker switches on the 15A circuit breaker panel to the On.
position.
4. Measure for -40 to -60 V DC between the -48 V DC supply and positive ground
return connectors at the circuit breaker panel for the circuit breakers in the 15A
circuit breaker panel that were out of range.
Is the voltage between -40 and -60 V dc at each position?
NO Go to Step 9.
YES The problem is probably located in the device or drawer attached to the
circuit breaker in question. Refer to the service guide for the drawers
installed in your rack for diagnostics.
5-24 7014 Model S00 Rack Installation and Service Guide
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