6.2.4 Trip (fixed trip value)
The fixed trip value refers to tripping when the differential current is 100 % or more.
No.
Setting
Min. setting
Max. setting
Factory setting
1030
Diff. fixed limit trip
Selection display
-
-
-
1031
Diff. fixed limit trip
Delay
0.01 s
2.00 s
0.05 s
The relays (max. two) to be activated are chosen under Trip (curve 2).
6.2.5 Use of relay outputs
For each function (warning and trip), two relay outputs can be set (relay output A and B). For both of these,
any of the relays available (standard: relay 1-5) can be used.
Due to the fact that tripping the generator breaker is insufficient in case of a differential current failure, a total
generator shutdown must be carried out. Dependent on the AVR (Automatic Voltage Regulator) in question,
the AVR should also be tripped, ensuring that the generator voltage is removed immediately. It is suggested
to use for example relay output A to trip the breaker and relay output B to trip the AVR. Alternatively, if that is
not possible, to shut down the engine.
The reason for this shutdown is to stop the damaging current flow caused by the internal failure (differential
current).
If warning or trip messages are to be sent to an alarm system, it is suggested to use separate relays for each
warning or trip alarm sent to the alarm system. This enables the alarm system to identify the cause of alarm.
6.3 Other settings
6.3.1 Status LED
This setting enables/disables the use of yellow light in the protection LEDs. When set ON, the LEDs for I>>,
I> and Id will indicate an alarm status (yellow), if the alarm set point is exceeded, but the delay timer is still
running. If the timer has run out (the alarm is triggered), the LED will be red.
No.
Setting
First setting
Second setting
Factory setting
4300
Status info via LED
Selection display
-
-
-
4301
Status info via LED
Show status
OFF
ON
OFF
6.3.2 Auto acknowledgement of alarms
Automatic acknowledgement of alarms is activated by turning setting 4312 ON.
No.
Setting
Min. setting
Max. setting
Factory setting
4310
Auto acknowledge
Selection display
-
-
-
4311
Auto acknowledge
Delay
0.10 s
10.00 s
2.00 s
4312
Auto acknowledge
Enable
OFF
ON
OFF
MDR-2 DRH 4189340300 UK
Parameter programming
DEIF A/S
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