363-208-011, Appendix 1
NJ00675A-2 Dual Power Feed Unit Installation Procedure
Issue 1 November 1998 1-5
normal, it would be necessary to change out the DPFU in service (hot
swap) based on the possibility that the unit would not respond correctly to a
future primary failure.
■ Circuit breakers CBA and CBB are rated at 30 Amps. and protect the 10
gauge secondary wiring between the DPFU and the Power Interface Unit
(PIU) on the SLC-2000 equipment.
■ Fuses A and B (-48VDC & RTN), accessible at front panel, are associated
with the internally located monitoring circuit.
■ Fuses A and B are GMT type fuses and are rated at 1/2 Amp., 60 Volts.
■ The green Power LED will light when one or more input feeders is provid-
ing -48VDC.
■ Red Alarms LED (A) is associated with input A and will light if input A is not
present. When LED (A) is lit, a loop closure can be sent to associated SLC-
2000 System or elsewhere via terminals 1 and 2 of the Alarms terminal
block, located on the DPFU faceplate.
■ Red Alarms LED (B) is associated with input B and will light if input B is not
present. When LED (B) is lit, a loop closure can be sent to associated SLC-
2000 System or elsewhere via terminals 3 and 4 of the Alarms terminal
block, located on the DPFU faceplate.
■ If alarm signals are sent to the SLC-2000 use J171 connector, used for
miscellaneous discrete environmental alarms. See Section 3 for details.
■ Normal operation of the unit is as follows:
— Green Power LED lit
— Both red Alarms LED’s A and B extinguished
— Both alarm outputs A and B are open
— Both power outputs are active
■ In order for the DPFU to provide power on both outputs from a single input,
the circuit breakers or fuses feeding the inputs must be sized at 45 or50
Amps and the input wiring must be 6 gauge. In addition, the output wiring
from the DPFU to the
SLC
-2000 System must be 10 gauge.
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