ABB REF 542plus Technical Reference Manual page 15

1MRS755859
Multifunction Protection and Switchbay Control
Unit
Technical Reference Manual
Unit Ready LED
*
Network Communication LED
*
Alarm LED
*
Interlocking Error LED
*
Electronic Keys Sensor
*
Object Control push buttons
*
Menu Navigation push buttons
*
Programmable LEDs
*
PC interface
*
Measurements Bars
*
Text
*
SLD view
*
CB fast opening
*
User defined command buttons
*
Unit Ready LED
This green LED is turned on when the unit is operational. This LED is switched off
when there is no power supply or when the unit is not operational.
Network Communication LED
This LED is meaningful only when the REF 542plus is equipped with a
communication module and configured to use it. When a communication module is
detected inside the unit, the LED turns on to green. If a communication module is
not detected or fails, the LED turns from green to red. When the unit is not
configured for the communication, the LED is switched off.
Alarm LED
The alarm LED turns to red when user-defined alarms become true. Several
arbitrary alarm conditions can be defined and configured with the operating tool.
Alarm conditions can be a trip of a protection function, loss of SF6 in the circuit
breaker and so on. When this LED is on, it is not possible to close the circuit breaker
or to download a new configuration. The alarm condition has to be removed and the
alarm must be acknowledged first.
Interlocking Error
The interlocking error LED is usually green. The LED turns temporarily to red when
the user attempts an operation that would violate the programmed interlocking
conditions, for example switching a disconnector with the circuit breaker in closed
position.
REF 542plus REF 542plus
15