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1MRS 752264-MUM
Motor Protection Relay
Operator’s Manual
REM 610
3.3.
Protection relay indications
The operation of the relay can be monitored by means of three different kinds of
indications on the HMI:
• Three indicator LEDs with fixed functionality: Ready, Start/Alarm and Trip
• Eight programmable indicator LEDs
• A text message on the display
The protection functions are not affected by fault indications.
3.3.1.
Indicator LEDs
When a protection stage starts or generates an alarm, the yellow indicator LED will
be lit. When a protection stage trips, the yellow indicator LED will remain lit and
the red indicator LED will be lit. When a starting protection stage is blocked, the
yellow indicator LED will start to blink. The yellow indicator LED will also be lit
to indicate an alarm from a protection stage.
3.3.1.1.
Green indicator LED
Fig. 3.3.1.1.-1 Green indicator LED
Two different functions are embedded in the green indicator LED: power on and
internal relay fault (IRF).
• Indicator off:
The auxiliary voltage is not connected.
• Lit indicator:
The relay is in operation. However, a less severe fault (warning) may have
occurred. Refer to section Indications for internal relay faults (IRFs) and
warnings.
• Blinking indicator:
An internal relay fault requiring repair by an authorized service supplier has
occurred. Refer to section Indications for internal relay faults (IRFs) and
warnings.
3.3.1.2.
Yellow indicator LED
Fig. 3.3.1.2.-1 Yellow indicator LED
• Indicator off:
No protection stage has started and there are no thermal alarms.
Green_a
Yellow_a
