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Magnum VS –48 Vdc User’s Manual Page 7
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.