5.1.2
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 34)
5.1.3
Testing the insulation resistance and polarization index
WARNING
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
delivered.
● Discharge the winding after measurement until the risk is eliminated, e.g. using the
following measures:
– Connect the terminals with the ground potential until the recharge voltage drops to a
non-hazardous level
– Attach the connection cable.
Measure the insulation resistance
1. Before you begin measuring the insulation resistance, please read the operating manual
for the insulation resistance meter you are going to use.
2. Make sure that no power cables are connected.
Assembling
5.1 Preparations for installation
SIMOTICS DC 1GH5
34
Operating Instructions 02/2016
Summary of Contents for SIMOTICS DC 1GH5
Page 2: ...08 02 2016 10 31 V4 00 ...
Page 12: ...Introduction 1 1 About these instructions SIMOTICS DC 1GH5 12 Operating Instructions 02 2016 ...
Page 50: ...Assembling 5 3 Installing the machine SIMOTICS DC 1GH5 50 Operating Instructions 02 2016 ...
Page 76: ...Operation 8 9 Faults SIMOTICS DC 1GH5 76 Operating Instructions 02 2016 ...
Page 98: ...Maintenance 9 2 Repair SIMOTICS DC 1GH5 98 Operating Instructions 02 2016 ...
Page 110: ...Spare Parts 10 7 Speed sensor SIMOTICS DC 1GH5 110 Operating Instructions 02 2016 ...
Page 114: ...Service and Support SIMOTICS DC 1GH5 114 Operating Instructions 02 2016 ...
Page 118: ...Quality documents SIMOTICS DC 1GH5 118 Operating Instructions 02 2016 ...
Page 128: ...Index SIMOTICS DC 1GH5 128 Operating Instructions 02 2016 ...
Page 129: ......