Nortel DMS-100 Series Maintenance Manual page 32

1-16 OPM maintenance summary
Power distribution equipment
The power distribution equipment includes the following:
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ac entrance panels
Two ac entrance panels are on the interior back wall row B, bay zero, of the
main compartment. The left-hand ac panel contains a circuit breaker and
lightning arrestors. The left-hand ac panel is used for commercial ac power.
The right-hand ac panel contains a circuit breaker and lightning arrestors. The
right-hand ac panel is used as an alternate feed of ac power if commercial ac
interruption occurs. This panel is used for power fed into the OPM cabinet.
The power is fed through a port on the right-hand end of the cabinet. The
power is from an emergency source like a fuel-powered generator.
Power control unit
The PCU is near the top of row A, bay one, between the two rectifiers for
NT8X01AA, AB, BAand BB. The PCU is above the two rectifiers for
NT8X01AC and BC. This unit contains the following:
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Battery control unit
The BCU is at the top left hand corner of row A, bay one. The BCU consists
of two battery charge controllers, BCC 0 and BCC 1. If batteries are not used,
the BCU is optional.
Rectifiers
The NT8X01AA, AB, BA, BB cabinets have two J2427B-1, 25A, -48V dc
switched-mode rectifiers. The NT8X01AC, BC cabinet has one NT5C90DB
297-8361-550 Standard 04.02 December 2004
two ac breaker panels
one ac distribution panel or PCU
one dc power FSP.
one 120 ac 15A duplex service receptacle with GFI protection
one 30A, 120/240V 3-PDT switch. This switch selects the source of input
power from the local utility, position 1 or emergency power generator
option, position 2.
six ac circuit breakers (CB) are assigned as follows:
— four 15A, double-pole 240V circuit breakers. These circuit breakers
connect to the rectifiers, CB1, 2, 5, 6.
— one 10A, single-pole 120V circuit breaker. This breaker feeds the two
heaters located in each ECU.
— one 15A, single-pole 120V circuit breaker. This breaker feeds the
duplex ground fault receptacle/dual service receptacle.
Note: The trip handles of CB1 and CB2 connect to form a two-pole
breaker. The CB5 and CB6 connect in the same way.