Checking For A Short-Circuit/Ground Fault At A Motor - Siemens SINAMICS S120 Function Manual

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Checking for a short-circuit/ground fault at a motor

The function is only available for vector control.

Function description

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

This function is only available for vector control.

In parameter 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). The parameter can be

configured as follows:

● 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 = 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 test can be executed once after the Control Unit is switched on (POWER ON) or each time

that 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 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.

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.

Drive functions

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

8.3 Checking for a short-circuit/ground fault at a motor

Basic functions