Testing The Insulation Resistance And Polarization Index - Siemens SIMOTICS M-1PH8 Operating Instructions & Installation Instructions

Assembling

5.2 Testing the insulation resistance and polarization index

● 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"
5.2 Testing the insulation resistance and polarization index
Hazardous voltage at the terminals
During and immediately after measuring the insulation resistance or the polarization index
(PI) of the stator winding, hazardous voltages may be present at some of the terminals.
Contact with these can result in death, serious injury or material damage.
● If any power cables are connected, check to make sure line supply voltage cannot be
● Discharge the winding after measurement until the risk is eliminated, e.g. using the
Measure the insulation resistance
1. Before you begin measuring the insulation resistance, please read the manual for the
2. Disconnect any connected main-circuit cables from the terminals before measuring the
46
WARNING
delivered.
following measures:
– Connecting the terminals with ground potential until the recharge voltage drops to a
non-hazardous level
– Connecting the connecting cable
insulation resistance meter you are going to use.
insulation resistance.
Operating Instructions 05/2012 A5E03986435A AA
SIMOTICS M-1PH8