Local Hmi Functionality; Protection And Alarm Indication - ABB RELION 620 Series Operation Manual

Section 3
620 series overview
3.2.5
3.2.5.1
26
The LHMI keypad on the left side of the protection relay contains 16 programmable push
buttons with red LEDs.
The buttons and LEDs are freely programmable, and they can be configured both for
operation and acknowledgement purposes. That way, it is possible to get
acknowledgements of the executed actions associated with the buttons. This combination
can be useful, for example, for quickly selecting or changing a setting group, selecting or
operating equipment, indicating field contact status or indicating or acknowledging
individual alarms.
The LEDs can also be independently configured to bring general indications or important
alarms to the operator's attention.
The lowest two buttons with LEDs on top are typically used for hot-line tag for the
emergency operation of the circuit controlled by the protection relay.
To provide a description of the button function, it is possible to insert a paper sheet behind
the transparent film next to the button.

Local HMI functionality

Protection and alarm indication

Protection indicators
The protection indicator LEDs are Normal, Pickup and Trip.
Table 8: Normal LED
LED state
Off
On
Flashing
Description
Auxiliary supply voltage is disconnected.
Normal operation.
Internal fault has occurred or the protection relay is in test mode. Internal faults
are accompanied by an indication message.
1MAC456939-IB D
620 series ANSI
Operation Manual