20 - 80 kVA parallel UPS system
User’s and Installation Manual
1018390
Revision C
40
1.
Check that the unsynchronised alarm is not active in the UPS modules.
(Press Menu button, choose UPS status display)
2.
Turn the maintenance bypass switch to BYPASS position.
Warning!
The use of the maintenance bypass switch will cause a break in the output voltage if the
input voltage or frequency is not correct and the UPS system is not synchronised to mains.
Following procedure does returning to normal online mode:
1.
Make sure UPS modules have been started according to chapter ‘Start-up procedure’.
2.
Check that UPS ON and BYPASS LED’s are lit in the front panel.
3.
Make sure service switches S11…S41 in the SPM9305 are in ‘ON’ position
4.
Turn the system bypass switch S51 to ‘UPS’ position.
Figure 28.
System bypass switch of the optional SPM9305.
8.4 Shut-down procedure
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.