Apc VS 50 User Manual download pdf (Page 14)

Magnum VS –48 Vdc User’s Manual Page 9

3.5. Counter Electro-Motive Force (CEMF) Cell Connections

WARNING: Hazardous energy levels are present on the CEMF connection

area of the plant. Accidental shorting of conductors can cause arcing and

high currents that can cause serious burns or other physical harm.

In some applications, a CEMF cell is used to lower the dc voltage delivered to the loads. The

CEMF cell is mounted externally to the Magnum VS. The CEMF connections are located at the

rear of the unit as shown in Figure 3.5-1. Two bus-plates, installed at the factory, bypass the

CEMF connection. If a CEMF cell will be used, remove the bus plate connecting the two CEMF

connection points and install two connection buses before installing the CEMF. The CEMF

connection buses each provide a pair of #10-32 studs on 5/8” centers for connecting two-hole

CEMF cable lugs. A ring size of 6 mm may also be used. Connect the CEMF cables as

applicable using #10-32 nuts.

Figure 3.5-1 CEMF Connection Locations

3.6. DC System Grounding

The positive bus for the power plant should be connected to the Central Office Ground. The

Battery Return provide a pair of #10-32 studs on 5/8-inch centers for connection of a two-hole

lugged cable to the Central Office Ground. A ring size of 6 mm may also be used. Cover this

connection with heat shrink tubing after assembly.

CEMF Connections

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Apc VS 50 User Manual Page 14