Siemens SIMOTICS HT Series, Operating Instructions & Installation Instructions

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7.6 Measure the insulation resistance and polarization index for the
commissioning
Measuring the insulation resistance and polarization index (PI) provides information on the
condition of the machine. It is therefore important to check the insulation resistance and the
polarization index at the following times:
● Before starting up a machine for the first time
● After an extended period in storage or downtime
● Within the scope of maintenance work
The following information is provided regarding the state of the winding insulation:
● Is the winding head insulation conductively contaminated?
● Has the winding insulation absorbed moisture?
As such, you can determine whether the machine needs commissioning or any necessary
measures such as cleaning and/or drying the winding:
● Can the machine be put into operation?
● Must the windings be cleaned or dried?
Detailed information on testing and the limit values can be found here:
"Testing the insulation resistance and polarization index" (Page 47)
7.7 Switching on the machine
● After starting the motor, observe it for a while to see if it is running smoothly and check the
monitoring devices.
● Monitor operation and the monitoring devices regularly and record the values you read off.
NOTICE
Motor damage caused by impermissible speeds
The motor is designed for a certain speed range. If a motor is operated at impermissible
speeds damage to the winding, bearings, or complete destruction of the motor can be the
result.
● Ensure that the speeds specified on the rating plate are not exceeded by appropriately
configuring controller and speed monitoring components.
See also
Description (Page 21)
Start-up
7.6 Measure the insulation resistance and polarization index for the commissioning
SIMOTICS HT Series HT-direct 1FW4...1......A
84
Operating Instructions 11/2018