Insulation Resistance And Polarization Index - Siemens SIMOTICS XP 1LA5 Compact Operating Instructions

Note
Note also the technical data on the rating plates on the motor enclosure.
NOTICE
Damage to the motor
To avoid material damage, before commissioning, check whether the correct
direction of rotation of the machine has been set on the customer side, e.g. by
decoupling from the driven load.
Note
The increased level of danger in hazardous areas demands that you pay particular
attention to the notes marked with
5.1.2 Insulation resistance
5.1.2.1

Insulation resistance and polarization index

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 100)
Explosion-protected machines
56100000002002, 01/2016
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Installation
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