APC VS 50 User Manual

Magnum VS –48 Vdc User’s Manual 

                                     

  Page 7 

 

 

 

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.