Insulation Resistance And Polarization Index; Testing The Cooling Of The Machine; Commissioning The Separately Driven Fan - Siemens SIMOTICS DP Operating Instructions Manual

Commissioning
7.1 Measures before commissioning
7.1.4

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 50)
7.1.5

Testing the cooling of the machine

Cooling
• Check that the machine cooling is available for commissioning.
See also
Preparing for use (Page 29)
7.1.6

Commissioning the separately driven fan

The separately driven fan ensures that the main machine is cooled irrespective of the main
machine speed or direction of rotation. The separately driven fan is only suitable for one
direction of rotation.
Checks before the first test run
Before the first test run, carry out the following checks:
• The separately driven fan is correctly fitted and aligned.
• The rotor runs freely.
• All of the retaining elements and electrical connections are securely tightened.
80
1FZ shaft height 280
Operating Instructions, 02/2022, A5E51698698A