80 kVA - 130 kVA UPS
User’s and Installation Manual
1017397
Revision D (update)
40
4.
Check that the UPS modules have started:
- Green UPS ON led is lit if mains power is available, yellow BATTERY led is lit
only if the UPS modules are on battery power.
5.
Check that yellow BYPASS led is lit in the front panel. This verifies that auxiliary
contact signal from the external system bypass switch S51 is ok (refer to
SPM9340 design with local tie panels).
6.
Transfer the critical load to the parallel UPS system by turning the external system
bypass switch S51 to ‘UPS’ position (refer to SPM9340 design with local tie
panels).
7.
Check from LCD display of UPS modules that the parallel system is running on
inverter power instead of static bypass. Hence, the critical load should be now
supplied by the parallel UPS system.
8.5 Switching off System
The UPS system does not have to be shut down at the end of each day. The system is
designed to cope with a continuous load from the day it is installed until a change is
needed in the backup battery bank.
In the N+1 redundancy mode, it is possible to shut down a single UPS module for
service. In the capacity mode, the external system bypass switch S51 must be first used
to transfer the system load to external bypass power (refer to SPM9340 design with
local tie panels).
The redundant UPS module of the parallel UPS system can be switched off in the
following manner if no critical UPS alarms are present:
1.
Check that all UPS modules are in the operational condition and open front door
of the selected UPS module:
– Main switch S1, input circuit breaker F2, and battery breaker F1 are in ‘ON’
position
2.
Check from control panel that the parallel UPS system is in the N+1 redundancy
mode.
Note!
The external system bypass switch S51 must be used for transfer operation
if the system has capacity mode and load exceeds N+1 redundancy level. Hence,
the load must be disconnected if the parallel UPS system does not contain the
system bypass switch S51 (refer to SPM9340 design with local tie panels).
3.
Turn the main switch S1, input circuit breaker F2 and the battery circuit breaker
F1 to ‘OFF’ position:
- The selected UPS module has now stopped to supply output power.
4.
Turn the appropriate service switch S11/21/31/41 to ‘OFF’ position in the external
SPM9340 cabinet or equivalent tie panel. This prevents high voltage to be present
in the output of the disconnected UPS module.
