IBM T00 - Page 49

7. Using a multimeter, verify that no voltage exists between the -48 V dc bus bars and the -48 V dc
return bus bars, A and B sides.
8. Record the locations of all cables or wires connected to the three connector pins on the circuit
breaker that is being removed. Disconnect the wires from the three connector pins and the -48 V dc
power connector.
9. Disconnect the wire that is attached to the bottom of the circuit breaker.
10. Disconnect the mounting nut that attaches the rear of the circuit breaker to the dc power bus bar.
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7
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10
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11
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5
1 A -48 V dc (-) Bus Bar 8 Mounting Nut
2 A -48 V dc (-) Power Cable 9 Three Connector Pins
3 A Return (+) Bus Bar 10 -48 V dc (-) Power Connector
4 10 mm hole, 25.4 mm Spacing 11 Connector Nut
5 A Return (+) Power Cable 12 B Return (+) Bus Bar
6 B Return (+) Power Cable 13 B -48 V dc (-) Bus Bar
7 B -48 V dc (-) Power Cable 14 Front of Power Distribution Panel
Chapter 3. Removal and Replacement 37