Normal Power Flow
Critical Load Receives Clean, Uninterrupted Power
Normal Feed - UPS Module - UPS Output - External Maintenance Bypass Panel - Critical Load
Utility Failure
Critical Load Receives Clean, Uninterrupted Power until battery depletes, generator starts or utility returns
Battery - UPS Module - UPS Output - External Maintenance Bypass Panel - Critical Load
UPS Module Failure
UPS transfers to Internal Bypass without interruption of load
Load receives raw utility power
Internal Bypass Feed - UPS Module - UPS Output - External Maintenance Bypass Panel - Critical Load
Service
Manual "Make Before Break" transfer without interruption of load
Load receives raw utility or generator power
UPS may be totally serviced safely
External Bypass Feed - UPS Module - UPS Output - External Maintenance Bypass Panel - Critical Load

Note - The service capability of this configuration shows why voltage into and out of the UPS system should be the same. If voltage stepdown occurs within the UPS module, 100% safe servicing capability is not available.

 


   

Site Update 03/26/08
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