2. The de-load input is activated and the GB is opened.
3. If the de-load input is deactivated again, the GB will give a GB close failure as the GB needs time to load
the spring before it is ready to close.
Different breaker types are used, and therefore there are two available solutions:
1. Timer-controlled
A load time set point for the GB control for breakers with no feedback indicating that the spring is loaded.
After the breaker has been opened, it will not be allowed to close again before the delay has expired. The set
point is found in menu 6230.
2. Digital input
A configurable input to be used for feedbacks from the breaker. After the breaker has been opened it will not
be allowed to close again before the configured input is active. The input is configured in the ML-2 utility soft-
ware.
If the two solutions are used together, both requirements are to be met before closing of the breaker is al-
lowed.
Breaker LED indication
To alert the user that the breaker close sequence has been initiated, but is waiting for permission to give the
close command, the LED indication for the breaker will be flashing yellow in this case.
4.4 Differential measurement
Differential measurement requires option H5, H7, H8.x, M4 or M15.x.
The differential measurements are all of the definite time type, that is two set points and timer are activated.
If, for example, the differential function is fuel filter check, the timer will be activated if the set point between
P
A
(analogue A) and P
B
(analogue B) is exceeded. If the differential value drops below the set point value
before the timer runs out, the timer will be stopped and reset.
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