ABB PCS100 UPS-I User Manual page 37

PCS100 UPS-I User Manual 37
The PCS100 UPS-I controller closes the switch-disconnector via an integral remote trip coil.
Capacitors in the Utility Disconnect contain enough energy to operate the trip coil in the event of a LVDC power
supply failure. An auxiliary relay provides feedback to the PCS100 UPS-I controller indicating whether the FSB is
open or closed.
The energy required to open or close the switch-disconnector is supplied via an internal spring which is charged
by an integrated motor. The PCS100 UPS-I will not attempt to open the FSB unless the ACB closing spring is
charged. This ensures that the FSB can re-close immediately whenever required.
A 2200 A or 4200 A PCS100 UPS-I can be applied without a Fail-Safe Bypass, However the Fail-Safe Bypass
provides increased security in the unlikely event of a Utility Disconnect fault such as an SCR over-temperature or a
low volts DC power supply failure.
If a 2200 A or 4200 A Fail-Safe Bypass is fitted, the main input and output terminals for connecting the PCS100
UPS-I to the utility and the load are contained on the right hand side of the Fail-Safe Bypass enclosure.