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The batteries are connected to the UPS through a circuit breaker,
which is manually closed and electronically tripped via the UPS
control circuitry. If the batteries are cabinet-mounted this circuit
breaker is fitted within the cabinet; however, if the batteries are rack-
mounted or otherwise located remote to the main UPS cabinet, then
the battery circuit breaker must be mounted as near as possible to the
batteries themselves, and the power and control cables connected to
the UPS using the most direct route possible Emerson Network Power
offer a purpose-designed remote battery circuit breaker box,
containing the circuit breaker and its necessary control board, as a
standard option kit. The battery cabinet or circuit breaker box should
be bonded to the UPS cabinet to maintain EMC compliance.
Battery circuit breaker boxes:
A battery circuit breaker box houses the battery circuit breaker and its
control board and is used to connect the battery to the UPS in
installations where the batteries are not contained in the standard
battery cabinet.
There are two boxes available which are similar in their design and
content. These are listed below:
100 Amp C/B Part No. 270141030400
160 Amp C/B Part No. 270141060400
Usually the 'box' is fitted as close as possible to the batteries. Battery
circuit breaker boxes must be earthed. The connections are similar to
the connections made to the battery cabinet.
Figure 3-7 shows details of the power and control cable connections
between the circuit breaker box or battery cabinet and the UPS itself.
Two methods of connecting the three pole battery circuit breaker are
illustrated. Method A shows the spare pole being used to divide the
battery bank in half, thereby reducing the battery total voltage to half
when the circuit breaker is open during servicing etc. Method B
connects the spare pole in series with the positive connection, thereby
providing two sets of contacts in the positive line as an added safety
precaution.
When installing the battery cabinet remove the battery fuse In the
UPS before making the battery circuit breaker power connections.
+ + + +
+ + + +
A - Half potential switching method
B - Double positive pole method
96 Cells 96 Cells
96 Cells 96 Cells
Figure 3-6: Battery C/B layout of switching poles
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