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PCS100 UPS-I
User Manual
3-Phase
Utility
Supply
Maintenance Bypass
3-Phase
Protected
Load
Coupling
Transformer
Inverter
Circuit
Breaker
DC
Circuit
Breaker
PCS100 UPS-I
Fail-Safe Bypass
(optional)
Utility Voltage
PCS100 UPS-I
supplied voltage
Output Voltage
Utility
Disconnect
Input
Circuit
Breaker
Energy
storage
Batteries
or
Ultracapacitors
Figure 2-2: PCS100 UPS-I Single line diagram
2.3
Operation
The following diagrams show how the PCS100 UPS-I behaves when a utility disturbance occurs, and what
happens when the Fail-Safe Bypass is operating.
Note: The following diagrams show a Fail-Safe Bypass. In some PCS100 UPS-I models the Fail-Safe
Bypass is integrated and for other models it is optional.
2.3.1
Utility Voltage within Limits
The power to the load is supplied from the utility (Online mode). Inverters are idling and maintain synchronization
with the utility voltage to allow instant operation in the case of a utility disturbance. A Float Charger (not shown)
maintains the state of charge of the battery or Ultracapacitor storage.
Energy Storage
Batteries
or
Ultracapacitors
Utility Disconnect
SCRs ON
Inverter
OFF
Fail-Safe Bypass
OPEN
Utility
Load
PCS100 UPS-I Voltage
Utility Voltage
Coupling
Transformer
Output Voltage
Legend
Energy Flow
Utility Voltage
PCS100 UPS-I Voltage
Figure 2-3: PCS100 UPS-I energy flow in case of utility supply within limits
Summary of Contents for PCS100 UPS-I
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