Remote Indication - ABB ESP M1R Installation Instructions Manual

7.

Remote indication

A remote indication of the reduced protection state is
provided for linking the protector to a building
management system, remote telemetry, PLC or directly
to an indication light or buzzer.
The unit has both a normally open and a normally closed
volt free contact. The terminal for the volt free contact
accepts 1.5 mm cable (solid or stranded conductor) and
2
is located on the top of the ESP unit. It has three
terminals, marked:
NO = Normally Open NC = Normally Closed C = Common
The normally open (NO) contact is open when the ESP
unit is healthy and power is present.
The normally closed (NC) contact is closed when the unit
is healthy and power is present.
As well as providing warning of the reduced protection
state, the normally closed volt free contact can also be
used to signal power loss on one or more phases,
eliminating the need for special relays. See Figure 13.
Installation instructions for mains wire-in protectors | 7/1