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9.3.7
Checking for a short-circuit/ground fault at a motor
When switching on the power unit, test pulses can be generated that check the connection
between the power unit and motor – or the motor winding itself – for a short-circuit or ground
fault.
Depending on the configuration in p1901, you can define as to whether only the short circuit
test is executed – or additionally, also a ground fault test (with higher current pulses).
● p1901.0 = 1
Checks for a line-line short-circuit once/always when the pulses are enabled.
● p1901.1 = 1
Checks for a a ground fault once/always when the pulses are enabled.
● p1901.2
p1901.2 = 0: The checks selected with bit 00 or bit 01 are performed once when the
pulses are enabled.
p1901.2 = 1: The checks selected with bit 00 or bit 01 are performed each time the pulses
are enabled.
The ground fault test is only possible when the motor is stationary, and is therefore only
realized when flying restart is deactivated (p1200 = 0).
The result of the checks that have been set is displayed in r1902.
The tests slightly delay motor starting, depending on what checks have been selected.
Note
The ground fault and short-circuit test are automatically deactivated as soon as a sine-wave
filter is connected, as the filter could be excited by the test pulse.
Enclosed Drives
Operating Instructions, 12/2018, A5E36652151A
Functions, monitoring and protective functions
9.3 Drive functions
533
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