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Functions; Monitoring Functions And Protective Functions; Insulation Monitoring - Siemens SINAMICS SM120 Operating Instructions Manual

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Operation

8.2 Functions

NOTICE
Incorrect parameterization
The drive may malfunction if you change the parameters.
Do not change the parameters, e.g. for the motor circuit-breaker.
Note
To complement these operating instructions, the List Manual contains an overview of all
parameters as well as a selection of function diagrams to describe the operating principle.
Only trained personnel may operate the drive.
8.2
Functions
Note
List manual
References to functions, function plans, and parameters are found in the list manual for the
drive.
8.2.1

Monitoring functions and protective functions

The drive features hardware and software functions that protect it against faults and damage
caused by impermissible operating statuses or hardware malfunctions. The monitoring
elements provide internal microprocessor-controlled monitoring and remote device monitoring.
8.2.1.1

Insulation monitoring

The drive is operated in an ungrounded IT supply system. This means that the drive can
continue to operate if just one ground fault occurs.
Note
A second ground fault causes the drive to fail.
For safety reasons, it is necessary to detect such ground faults, in order to eliminate the risk
of electric shock on the drive. This is the reason why the drive is equipped with insulation
monitoring (A-Isometer) that continually monitors the insulation state of the drive including that
of the motor.
78
SINAMICS SM120 6SL38715
Operating Instructions 07/2015

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