Insulation Resistance And Polarization Index - Siemens SIMOTICS XP 1MB1 series Operating Instructions Manual

● 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.
7.1.1

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"
1LA5/6/7/9, 1LG4/6, 1MA6/7, 1MB..1/2/3/4/5 - SH 63 ... 355
Operating Instructions, 06/2018, A5E44455710A
or fall below the lower speed limit n
max
Commissioning
7.1 Measures before commissioning
.
min
depends on the parameter
min
89