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3.0 Presentation
3.1 Isolation Unit (IU)
Rear view of the Isolation Unit
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6a
6b
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1
Isolation Unit (IU)
The Isolation Unit contains the UPSs isolation transformer, EMI/RFI and surge
suppression, bypass circuits including an auxiliary power supply, and mains and load
wiring interfaces. The IU is capable of autonomous operation and allows service of
the Electronics Unit without interruption of power to the load.
2
Input circuit breaker (power ON / OFF)
The input circuit breaker controls power to the UPS. It protects the UPS and the
service wiring from extreme overloads.
3
Cooling fan
The fan exhausts air from the IU and operates whenever the input circuit breaker is
ON (I). If the fan fails, the UPS will indicate an alarm condition. Under such condi-
tions, the UPS will remain operating and is capable of delivering full power to the
load.
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