Operation; Utility Voltage Within Limits - ABB PCS100 UPS-I User Manual

16 PCS100 UPS-I User Manual
Utility Voltage
3-Phase
Utility
Supply

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.
Utility Voltage
Utility
Figure 2-3: PCS100 UPS-I energy flow in case of utility supply within limits
Input
Circuit
Utility
Breaker
Disconnect
Figure 2-2: PCS100 UPS-I Single line diagram
Fail-Safe Bypass
OPEN
Utility Disconnect
SCRs ON
PCS100 UPS-I
supplied voltage
Maintenance By pass
Fail-Safe Bypass PCS100 UPS-I
(optional)
Energy
storage
DC
Circuit
Batteries
Breaker
or
Ultracapacitors
Coupling
PCS100 UPS-I Voltage
Transformer
Energy Storage
Inverter
OFF
Batteries
or
Ultracapacitors
Output Voltage
Circuit
Breaker
Coupling
Transformer
Inverter
Load
PCS100 UPS-I Voltage
3-Phase
Protected
Load
Output Voltage
Legend
Energy Flow
Utility Voltage