TGH1402en/11.2020 9
MF loop monitor
Generator current
I
Gen
in the event of a longitudinal discontinuity
If the generator current drops below the response value
I
2
, SRCM420 outputs an alarm and shuts
down the contactor (BS).
Generator current when the operator unit is switched off and when there
are possible transverse discontinuities
Parasitic parallel resistances in the loop, e.g. L1 to PE can cause the contactor (BS) to switch on
due to the increase in generator current. These resistances must therefore be monitored cons-
tantly by an insulation monitoring device.
The following principle circuit diagram gives an overview of how the MF loop monitor operates.
Содержание AF460
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