Checking The Insulation Resistance And Polarization Index Of The Winding - Siemens SIMOTICS XP Series Operating Instructions Manual

Assembly
5.2 Preparing for installation
5.2.2.2

Checking the insulation resistance and polarization index of the winding

Hazardous voltage at the terminals
Hazardous voltages are sometimes present at the terminals during and immediately after
measurement of the insulation resistance or polarization index of the winding. Contact with
these can result in death, serious injury or material damage.
• If power cables are connected, ensure that a line voltage cannot be applied.
• Discharge the winding after measurement until the risk is eliminated, e.g. using the
Measure the insulation resistance
1. Follow the instructions in the Operating Manual of the insulation measuring instrument
used.
2. Ground other windings, integrated winding temperature sensors and, if applicable, other
mounted and installed components.
3. If power cables are connected, ensure that a line voltage cannot be applied.
If no power cables are connected, this reduces the effect of the I/O devices on the
measurement.
4. Measure the winding temperature and the insulation resistance of the winding in relation
to the machine enclosure. The winding temperature should not exceed 40 °C during the
measurement.
5. Convert the measured insulation resistances in accordance with the formula to the
reference temperature of 40 °C. This thereby ensures that the minimum values specified
can be compared.
6. Read out the insulation resistance one minute after applying the measuring voltage.
7. Discharge the winding after measurement, e.g. by doing the following:
– Connect the terminals to the ground potential until the recharge voltage drops to a
– Attach the connection cable.
56
WARNING
following measures:
– Ground the terminals until the recharge voltage drops to a non-hazardous level.
– Attach the connection cable.
non-hazardous level
1MB..1/2/3/4 - shaft heights 63 ... 355
Operating Instructions, 06/2020, A5E44455710A