ABB REF 542plus, Operator'S Manual, Page: 17 / 134

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3.3. REF 542plus status information area
A051338
Fig. 3.3.-1 Status Information area
1 Ready: Operation status of the unit
2 IBB Error: Network communication status
3 Alarm: Indication according to the programmed alarm condition
4 Interlocking: Indication for inadmissible control action
The HMI shows the following status information:
*
Ready. This green LED is turned on when the unit is in the operational state. The
LED is switched off when the auxiliary power is not present or when the unit is
not operational (FUPLA is not running).
*
IBB(interbaybus) Error. This LED is meaningful only when the REF 542plus is
equipped with a communication module. When the configured communication
module is detected the LED turns on to green. If the module is not detected or
fails, the LED turns red. When a Modbus communication module is installed, the
LED becomes orange if the communication error rate increases. It becomes red
when the communication error rate prevents good communication. The LED
comes back to green when no communication errors occur or by resetting the
module status registers (see the Modbus technical reference). When there is no
communication module, the LED is always switched off.
*
Alarm: this LED turns to red when the user defined alarms become true.
Several arbitrary alarm conditions can be defined and configured with the
Operating Tool. Alarm conditions could be the 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 must be acknowledged first.
*
Interlocking Error: this LED is usually green. It 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.
Multifunction Protection and Switchgear Control Unit
Operator's manual
REF 542plus REF 542plus
1MRS755869