APC VS 100, VS 50 Battery Connections, Planning the Battery installation, Connecting the Cables

3.4. Battery Connections

WARNING: Hazardous energy levels are present on bare conductors in the dc distribution connection area of the plant. Accidental shorting of distribution conductors can cause arcing and high currents that can cause serious burns or other physical harm. It is recommended that:

•Remove any jewelry, rings or watches while working on this equipment.

•Use insulated wrenches, screwdrivers, cutters, pliers and other tools.

Planning the Battery installation

The battery cable(s) should be sized to limit the voltage drop from the dc power plant to the battery during charging per system design requirements. The cable(s) must also carry the full load current during battery operation. If assistance is required to determine the necessary cables for the application, contact your sales representative or APC (Refer to Section 10 for APC Customer Support information. A fuse or circuit breaker (various options are available from APC) is recommended in the negative line to protect the cables from the battery to the dc power plant. If a circuit breaker is used, the power plant can monitor auxiliary contacts from this breaker.

Connecting the Cables

WARNING: Make certain that the battery polarity is correct when making connections to the dc power plant. Incorrect connection could cause severe equipment damage.

The battery cable connections are located at the rear of the unit as shown in Figure 3.4-1. The battery positive and battery negative buses each provide a pair of #10-32 studs on 5/8” centers for connecting two-hole battery cable lugs. A ring size of 6 mm may also be used. Connect the battery cables as applicable using #10-32 nuts. Cover connections with heat shrink after assembly.

Magnum VS –48 Vdc User’s Manual Page 7