Step 6
(from Step 5)
1. Set all circuit breaker switches in the 20A/10A circuit breaker panel to the Off
position.
2. Reconnect the device power cables and return ground cables for those circuit
breaker positions which were out of range in Step 3a.
3. Set the circuit breaker switches for the positions which were out of range in Step
3a to the On position.
4. Measure for -40 to -60 V DC between the -48 V DC supply and positive ground
return connectors
for the circuit breakers in the 20A/10A circuit breaker panel
that were out of range.
Is the voltage between -40 and -60 V dc at each position?
NO The power problem is probably located in the attached device. Consult
the service guide for the failing device for diagnostics.
YES There was probably an intermittent problem with the circuit breaker panel,
or an intermittent short at the attached device or cable.
Step 7
(from Step 3b)
The circuit breaker panels are functioning properly. The power problem is probably
located in the power supply for the system or devices installed in your rack. Refer to
the service guide for the system installed in your rack or service guide for the
drawers installed in your rack for diagnostics.
Chapter 5. Maintenance Analysis Procedures (MAPs) 5-23
To Next Page
Loading...
