Insulation Resistance And Polarization Index; Checking The Machine Cooling - Siemens SIMOTICS DP 1PC1423 Operating Instructions Manual

Low-voltage motors, roller-table motors sh 112... 400

Table of Contents

Converter operation

• If the motor design requires connection to a specific converter type, carefully check the

supplementary data on the rating plate/supplementary plate.

• Ensure that the converter is correctly parameterized. Depending on the design, you will find

some parameterization data on the rating plate of the machine. Further information is

provided in the converter documentation. Contact the Service Center (Page 12) if required.

• Check that the supplementary equipment and devices to monitor the machine are correctly

connected and are functioning correctly.

• In continuous operation, carefully ensure that the motor cannot exceed the specified upper

speed limit n

The permissible acceleration time to the limit speed n

assignment.

7.1.3

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?

From this, 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 46)

7.1.4

Cooling

• Carefully check that it is guaranteed that the machine is cooled when it is being

commissioned.