Understanding UPS Operation
The parallel system can be transferred from Normal mode to Bypass mode manually. However, the parallel system automatically switches to Bypass mode whenever the UPMs can no longer supply the critical load. If the parallel system transfers to Bypass mode from Normal mode due to an output voltage deviation, the parallel system automatically attempts to return to Normal mode (up to three times within a
Bypass mode is a normal operating mode, not an alarm condition. However, if the parallel system is unable to return to Normal mode following an automatic transfer to Bypass mode, an alarm condition is recorded.
Bypass may also be used when the modules in the system must be shut down to perform routine maintenance or repairs.
In the Parallel Redundant (N + 1) arrangement, the
In the Parallel Capacity (N + 0) arrangement, if one unit trips offline and goes to bypass, the remaining units also go to bypass.
EATON Powerware® 9390 UPS |