Insulation Resistance; Insulation Resistance And Polarization Index - Siemens SIMOTICS XP Operating Instructions Manual

Damage to mounted parts and components as a result of high temperatures
The motor components get very hot during operation. High temperatures can damage parts
mounted by customers, such as cables manufactured out of materials that are not heat
resistant.
• Temperature-sensitive parts must not come into contact with or be attached to
components mounted on the machine.
• Only use heat-resistant mounting parts. The connecting cables and cable entries must be
suitable for the particular application.
5.2.2

Insulation resistance

5.2.2.1

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 54)
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Operating Instructions, 10/2021, A5E41926185A
Assembly
5.2 Preparations for installation
53