Liebert 30-130kVA 3.5 Communication Interfaces

Operation

Status conditions give the Operator additional knowledge about UPS operation. Some are indicated

on the Mimic Display screen by a text message while others are depicted graphically.

The following status messages may appear in the Operator display.

• Static Switch Connected. The static switch is connected (the disconnect switches are closed - ON)

and is ready to provide a current path from the bypass input to the load.

• Static Switch Disconnected. The static switch is disconnected (the disconnect switches are open -

OFF) for maintenance procedures.

• OK to Transfer. The UPS system voltage, frequency, and phase match the bypass line. This

means that a transfer between the bypass line and the UPS is permitted.

• Not OK to Transfer. Either the UPS or bypass voltage, frequency, or phase is not within the spec-

ified limits or the static bypass switch is not available. Therefore, manually-initiated transfer

between the bypass line and the UPS is not permitted. Emergency or overload transfer to bypass

may still be available provided the “Static Switch Unable” alarm is not indicating.

• Time to Overload Transfer. During an overload condition, the time remaining before tra nsfer (in

seconds) is displayed at the bottom of the load block.

3.5 Communication Interfaces

The Npower UPS can be configured with various communication ports to assist the Operator in moni-

toring the UPS system.

Input Contact

#4 Alarm YES YES NO YES

The System has been notified from the OC-