Insulation Resistance And Polarization Index; Regreasing Intervals And Types Of Grease For Operating Rolling-Contact Bearings - Siemens SIMOTICS XP Operating Instructions Manual

Maintenance
9.1 Inspection and maintenance
9.1.8.3

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"
9.1.8.4

Regreasing intervals and types of grease for operating rolling-contact bearings

Regreasing intervals
The regreasing intervals for rolling bearings in operating hours and the grease types are
stated on the machine's lubricant plate. Regardless of the actual number of operating hours
reached, regrease the motor at least once a year. The lubrication information can be found
on the lubricant plate.
Note
Observe the regreasing intervals for the rolling bearings
The regreasing intervals for rolling bearings are different from the service/inspection intervals
for the machine. Failure to regrease the rolling bearings at the specified intervals can result in
bearing damage.
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Operating Instructions, 10/2021, A5E41926185A