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1773/1775/1777
Users Manual
56
Inrush Current. Inrush currents are surge currents that occur when a large or low-impedance
load comes on line. Normally the current will stabilize after some time when the load has
reached normal working condition. For example, the start-up current in induction motors can
be 10x the normal working current. See Ta b l e 1 5 . The inrush current begins when the
½-cycle RMS current rises above the inrush threshold, and ends when the ½-cycle RMS
current is equal to or below the inrush threshold minus the hysteresis value. In the event table,
the extreme value is the highest ½-cycle RMS value of the event.
Parameters to configure:
Trigger on/off
Limit
The current threshold limit is the ½ cycle RMS value in A. A signal exceeding this limit
triggers the event.
Table 15. Inrush Characteristics
Threshold (=Trigger)
Hysteresis
Duration
A
B
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C
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