4NWP100559R0001_OPM_ABB_PVA31-11-T_10-20kVA_EN_140626 Page 20/37 ABB
Modifications reserved
4.3.2 External battery cabinets
WARNING!
BATTERY REPLACEMENT AND CONNECTIONS SHOULD ONLY BE
PERFORMED BY QUALIFIED PERSONNEL
To achieve longer back up times, connect in parallel several string (with the same amount of batteries in
series – 24 pieces).
1. If the UPS has internal batteries, disconnect the battery connectors.
2. Connect a battery breaker between the external battery cabinet and the UPS according to Table 2.
UPS power # phases Fuse
10 kVA 1 80 A
10 kVA 3 25 A
20 kVA 1 160 A
20 kVA 3 50 A
Table 2: Recommended fuse rating
3. Set the battery breaker to the position OFF and connect the batteries (24 batteries in series).
4. Connect the battery cabinet to the battery terminals in the rear of the UPS.
5. Reconnect the internal battery cables (if present).
6. Connect the input wires of the UPS and then set the battery breaker to the position ON. The UPS will
start charging the batteries.
4.4 Backfeed Protection
To support protection against UPS back feed currents, an additional external isolation device must be
installed in the bypass path according to Figure 17. Remove the protecting cover of the back feed
terminals on the back of the UPS and install a contactor (see Table 1 for dimensioning). Install the back
feed control wire according to relevant wiring rules.
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