Configuring The Short-Circuit/Ground Fault Test Mode - Siemens SINAMICS S120 Function Manual

Basic functions

7.3 Configuring the short-circuit/ground fault test mode

7.3 Configuring the short-circuit/ground fault test mode
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.
This function is only available for vector control.
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
Checks for a conductor-conductor short-circuit once when the pulses are enabled.
● p1901.1
Checks for a ground fault once when the pulses are enabled.
● p1901.2
Checks for a conductor-conductor short-circuit and ground fault each time the pulses are
enabled.
The test can be executed once after the Control Unit is switched on (POWER ON) or each
time that the pulses are enabled.
The motor must be stationary when executing the ground fault test. This is the reason that
when the "Flying restart" function is activated (p1200 = 0) a ground fault test is not executed.
The tests slightly delay motor starting, depending on the selection in p1901. The result of the
short-circuit or ground fault test is indicated in r1902.
Note
The ground fault and short-circuit test is automatically deactivated as soon as a sine-wave
filter is connected. The test pulses can excite the filter.
320
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions