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1400 Connecting External Battery Cabinets
1. Open the carton containing the external battery cabinet cable
assembly, and check that all required parts have been shipped
with it.
2. Remove the screws holding the UPS cabinet back panel
containing the power entrance panel, as shown in Figure 18.
3. Use a pliers to bend back and forth the narrow links (1 and 2 in
drawing) between the outer edge of the lower (square) breakaway
panel and the back panel, as shown in Figure 36. After breaking
these links, use the pliers to bend back and forth the entire
breakaway panel (at 3 and 4 in drawing) until it breaks away.
4. Verify all hazardous voltages have been removed from the backplane by testing with a voltmeter or other
test device. (Always test before touching.)
5. Remove the nuts holding the +DC and the –DC bus bars to the backplane as shown in Figure 37. Remove
the ring terminal and the compression lug from the –DC bolt.
6. Position the bus-bar extension assembly onto
the +DC and –DC bolts as shown in Figure 37.
Replace the compression lug onto the –DC bolt
of the bus-bar extension assembly. Secure the
assembly by replacing the two nuts removed in
the previous step.
7. Use the bolt and nut supplied with the cable
assembly to attach the ring terminal to the
empty hole in the –DC bus bar.
8. Torque all three bolts to 75–85 in-lb
(8.5–9.6 Nm).
9. Loosen the three large nuts at one end of the
cable assembly. The two cable ends are
identical, so use either end.
10. Slip the terminals of the cable assembly onto
the tabs of the bus-bar extension, putting the
Figure 36. Breakaway Panel Links
Figure 37. Bus-bar Extension Installation
CAUTION!
Before making connections between the UPS and an external battery cabinet or between series-connected
(daisy-chained) battery cabinets, remove all input AC power to the UPS. Do this by opening the input
service circuit breaker or by turning the external bypass switch to the Service position.
Also, disconnect all battery strings in the UPS and in the external battery cabinet, to ensure DC voltage is
removed from the internal DC buses. Do this by either removing all battery modules from the cabinets or,
at least, unplugging one of every pair of battery modules plugged into each cabinet backplane.
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