1MRS 752179-MUM
Earth-Fault Relay
Operator’s Manual
REJ 521
9
3.1.2. Display
3.1.2.1. Display test at power up
When the auxiliary voltage is connected to the relay:
1. The backlight will be turned on after the relay has performed the internal
power-up tests and entered into the protection mode.
2. The display will be tested by inverting it for a short time.
3. The display will be returned to the idle mode and the backlight turned off.
However, if the non-volatile function is active, a message shown on the display
before the auxiliary voltage was disconnected will reappear on the display.
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3.1.2.2. Display idle mode
When the relay is in the idle mode, the station name will be displayed, which by
default is “- ABB -”. To change the station name, use SPA parameter M20.
)LJ 'LVSOD\LQWKHLGOHPRGH
3.1.2.3. Display backlight
• Normally the backlight of the display is off.
• The backlight is turned on at the touch of an arrow button on the HMI. If the HMI
panel has not been used for approximately five minutes, the backlight will be
turned off automatically.
• A power saving built-in feature: pressing the [C] button will turn the backlight off
within 20 seconds.
Powup
C
E
STARTREADY TRIP
Idle
C
E
- ABB -
STARTREADY TRIP
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