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Stop/Start UPS and Operating the External Service Bypass
990-4041
User Guide APC Silcon 480kW 400V UPS 17
2.7 Isolating one UPS in a Parallel Configuration for Service/Maintenance
2.7.1 Isolating one UPS in a Parallel/Redundant System
In a redundant system one UPS may be isolated for service/maintenance without affecting
other parallel UPS(s).
Service
bypass
switch
Load
Mains
APC Silcon
UPS
APC Silcon
UPS
Action
1. Check that the remaining UPS(s) will be able to carry the load when one UPS is isolated.
2. Switch off the system to be isolated for maintenence by pushing the green ON and the red
OFF button simultaneously.
3. Disconnect output and mains by setting output switches (Q002) to position 0 and input
switch (Q001) to position 0. Disconnect battery by opening battery breaker.