363-208-011, Appendix 1
NJ00675A-2 Dual Power Feed Unit Installation Procedure
Issue 1 November 1998 1-9
Step 19:
Verify that the green Power LED lights on the front panel.
Step 20:
Verify on P2 (Alarms) terminal strip that there is no continuity (using
VOM as ohmmeter) between terminals 1 and 2 and 3 and 4 respec-
tively.
Step 21:
Open 45 or 50 Amp. circuit breaker A on the BDFB. Green Power LED
should remain lighted. Verify A Alarms LED lights and that continuity
exists between P2 (Alarms) terminals 1 and 2 (A).
Step 22:
Restore circuit breaker A then open 45 or 50 Amp. circuit breaker B on
the BDFB. Green Power LED should remain lighted. Verify B Alarms
LED lights and that continuity exists between P2 (Alarms) terminals 3
and 4 (B). Reverify that both outputs -48A and -48B are present.
Step 23:
Restore circuit breaker B.
Step 24:
Replace plastic cover on DPFU faceplate.
Step 25:
Procedure complete.
DPFU In-Service Change Out (Hot
Swap)
Description
Design provisions have been established to allow the replacement of a DPFU,
under certain conditions. with a replacement unit without a service interruption.
The conditions are such that a A or B alarm is declared indicating a problem with
internal diode modules and/or the control board, while both primary voltages and,
at least one secondary voltage remain normal. In this case it is clear that the unit
must be replaced since the anticipated protection inherent to the unit may not be
viable. Under these, or similar conditions, use the following “hot swap” procedure.
Note that in a situation where both secondaries are down the initial DPFU should
simply be changed outright, as a service interruption is already in progress.
Step 1:
Mount the replacement DPFU directly under the DPFU to be replaced.
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