Apc DC Power Plant MX28B-1200 User Manual download pdf (Page 16)

MX28B-1200 PRODUCT MANUAL Revision B

10 MX28B-1200/2400

4.5 AC Input Power

Each rectifier requires 208/220/240V ac, single-

phase, 50/60 Hz, supplied through an external 20-

amp two-pole breaker. A vertical wire channel at

the rear of the box frame provides terminal strips

for ac input power connection of each shelf.

Separate “Earth Ground” terminal bars are

provided for the connection of the safety ground

wires. A power entry box is provided at the top

and rear of the box frame where AC wiring

conduit can be attached. Refer to Figure 4-3.

4.6 Battery connections

Battery connections are made at the top rear of the

unit. The -48V and Battery Return buses each

provide four sets of threaded 3/8”-16 holes on 1

inch or 1 ¾ inch centers for connecting two-hole

battery cable lugs. Refer to Figure 4-3.

A battery disconnect breaker is required external

to this equipment. The power plant can monitor

auxiliary contacts from this breaker. Battery

temperature compensation is available. APC’s

master control unit, in conjunction with the

optional temperature monitor sensor cable, is used

to implement this function.

4.7 DC Distribution

A standard power distribution module within the power

box frame contains two 24-position plug-in circuit

breaker columns, providing -48V power for customer

loads. Each breaker column is connected at its center to

the -48V dc bus, with each side having an ampacity of

300A. Connections for the -48V dc loads are located

directly to the side of the corresponding breaker. A

typical load connection would utilize a #6 AWG wire

with a two-hole lug on 5/8-inch centers, attached with

standard #10-32 mounting screws.

The load return cables for each circuit breaker section

connect to a return bus directly opposite the circuit

breakers. These return buses contain patterns for 28

two-hole #10-32 lugs on 5/8-inch centers, and 14 two-

hole ¼”-20 lugs on a double-pattern of either 5/8-inch

or 1-inch centers. Figure 4-4 shows the power plant’s dc

Battery

Connections

AC entry and

vertical wiring

channel

Circuit Breaker Positions

(

)

Load Returns (+) and

Facility Main Ground Bus

Figure 4-3 Power Entry Box and Battery

Connections

Figure 4-4 DC Distribution

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Apc DC Power Plant MX28B-1200 User Manual Page 16

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