Independent Mode - ABB HiPerGuard MV UPS User Manual

Step User Action
1 Press "Stop"
2
3
4
5
Table 8.3: MV UPS system stopping steps
8.4.

Independent mode

The MV UPS transfers from the power conditioning mode to Independent mode during deep sag events
and outages according to the input breaker management curve.
Step User Action
No user action required; the system will
1
operate fully autonomously during this event
2
3
4
Table 8.4: MV UPS transferring automatically into Independent Mode
The MV UPS(s) is (are) fully supplying the load active and reactive power requirements while being
disconnected from the input. The system monitors for the return of a reliable power supply to enable
resynchronization.
HI PE RG UA RD M V UP S U S E R M A N UA L
System Response
If the MV UPS system is in Independent mode
or the utility voltage is not within acceptable
limits, the system will ask the operator to
confirm to abort the discharge and initiate
system stop
Commands to Close S
abp
MV UPS (s) load voltage synchronize(s) with
utility voltage magnitude, frequency and
phase
When S is closed MV UPS(s) block(s) will
abp
command to open S and then S
out
After S and S are opened, system will stop
out in
PEBBs
System Response
System detects an event when utility voltage
drops below specified threshold level for a
limited time which is based on S
characteristics curve
The MV UPS opens S of each MV UPS
in
The MV UPS regulates the load voltage with
internal frequency and voltage as its
references
O P E R AT I O N
while simultaneously
in
operation
in
96/103