Energy Storage Depleted - ABB HiPerGuard MV UPS User Manual

82 H I P E R G U A R D M V U P S U S E R M A N U A L
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8.8 Energy storage depleted

The energy storage autonomy definition is an essential part of the system design. Depending on the load condi-
tions, the time which the MV UPS can support the load when operating on Independent mode can be extended (in
case of the load is lower than the projected load) or reduced (when operating under overload condition).
The MV UPS continually monitors the state of charge of the batteries. In case of extended power outages, before
the complete depletion the energy storage, at the end of the autonomy time, the MV UPS will switch to the bypass
mode.
Step User Action
1 Energy storage depleted.
2
3
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Table 8.09: System
reaction to depleted
energy storage.
System Response
Commands to close Sabp. MV UPS waits in the
previous state until Sabp closes.
When Sabp is closed then the MV UPS opens
Sout and Sin. MV UPS stops the PEBBs and re-
verts to bypass mode.