Apc VS 50 User Manual download pdf (Page 10)

Magnum VS –48 Vdc User’s Manual Page 5

Ventilation

The rectifier modules for this system have fans that provide front-to-rear airflow for internal

cooling. The power system housing should be mounted such that there is free airflow to the

front and back of the unit. [Refer to Section 9.5 for environmental characteristics.] Free airflow

should be ensured so that the power system can provide full power without de-rating.

3.3. AC Power Connections

WARNING: Ensure that all of the external dc and ac circuit breakers are in the

OFF position prior to connecting service to the power plant. Confirm that all

voltages have been removed including any battery sources before proceeding.

AC Connections

The dc power system requires the supply of 85 – 264 Vac, 47 – 63 Hz single phase power. One

alternating current (ac) input on the power system backplane supplies power to the first rectifier

in each shelf. Two inputs supply power to the second and third pair of rectifiers and the fourth

and fifth pair in each shelf. This scheme allows a variety of wiring options. Provided the input

wiring is not overloaded, one, two or all three inputs on each shelf can be jumpered together.

The ambient temperature and number of wires in a conduit must be considered in accordance

with NEC and local requirements. The power system typically ships with the jumpers shown in

the backplane layout of the Magnum VS 50 shown in Figure 3.3-1. The Magnum VS 100

contains two identical backplanes. The input terminals are defined in Figure 3.3-3. If one ac

input cable is used it is typically connected to TRM10, 7 and 4.

Figure 3.3-1 Magnum VS 50 Backplane

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Apc VS 50 User Manual Page 10