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Understanding U PS Operation
3-2
EATON Powerware
®
9315 UPS (200–300 kVA) Operatio n Manual S 164201036 Rev F powerware.com
Bypass
Input
Rectifier
Input
Output
Path of electrical power
Battery
Rectifier Inverter
Bypass
K4
Transformer
K3
(Closed)
CB1
Figure 3-1. Path of Current Through the UPS in Normal Mode
If the utility AC power is interrupted or is out of specification, the UPS automatically
switches to Battery mode to support the critical load with no interruption. When utility
power returns, the UPS returns to Normal mode.
If the UPS system becomes overloaded, the UPS switches to Bypass mode. The UPS
automatically returns to Normal mode when the error condition is cleared and system
operation is restored within specified limits.
If the UPS suffers an internal failure, it switches automatically to Bypass mode and remains
in that mode until the failure is corrected and the UPS is back in service.