OPERATION
Step User Action System Response
3 When S
abp
is closed or S
abp
close request time-
out period is elapsed then MV UPS opens S
out
and S
in
. MV UPS stops the PEBBs and reverts
to bypass mode
Table 8.8: System reaction to fault while in IM
8.8. Energy storage depleted
The energy storage autonomy definition is an essential part of the system design. Depending on the
load conditions, the time which the MV UPS can support the load when operating in Independent mode
can be extended (in case 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 of the energy storage, at the end of the autonomy time, the MV
UPS will switch to the bypass mode.
Step User Action System Response
1 Energy storage depleted
2 Commands to close S
abp
. MV UPS waits in the
previous state until S
abp
closes
3 When S
abp
is closed then the MV UPS opens
S
out
and S
in
. MV UPS stops the PEBBs and
reverts to bypass mode
Table 8.9: System reaction to depleted energy storage
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