Priority Of Indication Messages; Protection Indications; I/O Test - ABB REJ 527 Operator's Manual

REJ 527
3.3.2.
3.3.3.
3.3.4.
22
Directional or Non-Directional Earth-Fault Relay
Operator's Manual
• A text message and LED indication. This type of message is related to an internal
fault or an alarm message.

Priority of indication messages

The messages on the LCD have a certain priority order. If different types of
indications are activated simultaneously, the message with the highest priority
appears on the display. The priority order of the messages:
1. Internal fault
2. Trip, CBFP
3. Start
Indication messages (priorities 1-3) give automatically an overview of protection
and condition monitoring operations and internal protection relay faults. The
indications are shown in a priority order on the LCD display and the indication
messages remain active until acknowledged by pressing the [C] button.

Protection indications

• When one of the protection functions of the relay starts, the name of the
concerned function appears on the LCD display. The yellow indicator LED is
also lit.
• If a started protection function is blocked, the yellow indicator LED is blinking
and the name of the corresponding function is shown on the display.
• When a protection function operates, the name of the function and the energizing
input that caused the trip appear on the LCD display. The red indicator LED is
also lit.
• When a protection function delivers a delayed trip for circuit-breaker failure
protection, the text CBFP appears on the LCD, the red indicator LED is lit and
the energizing input that caused the fault is shown on the display.

I/O test

From the menu "Function test/BI" it is possible to enter the test mode. In the test
mode all internal signals from different protection stages can be activated one by
one.
1. Enter the test mode by pressing the [E] button and select the wanted signal with
→ ←
the [ ] or [ ] button.
2. To activate the signal, press the [E] button.
3. To leave the test mode press the [C] button.
The table below shows the activation order and the corresponding number flashing
when a signal is tested.
Table 3.3.4-1 I/O test
0 1
Number
IRF U
0b
Function
Note that the output contacts may be activated.
2 3 4
> t > I >/U > t >
b 0 0 0
1MRS 751055-MUM
5 6 7 8
I >>/ t >> - -
0 0
U >>
0