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Measurement Of The Insulation Resistance And Polarization Index In The Context Of Maintenance Work - Siemens 1LA8 Operating Instructions Manual

Simotics tn series induction motor.
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9.1 Inspection and maintenance
Dust disturbances when working with compressed air
When cleaning with compressed air, dust, metal chips, or cleaning agents can be whirled up.
Injuries can result.
When cleaning using compressed air, make sure you use suitable extraction equipment and
wear protective equipment (safety goggles, protective suit, etc.).
Damage to insulation
If metal swarf enters the winding head when cleaning with compressed air, this can damage
the insulation. Clearance and creepage distances can be undershot. This may cause damage
to the machine extending to total failure.
When cleaning with compressed air, ensure there is adequate extraction.
Machine damage caused by foreign bodies
Foreign bodies such as dirt, tools or loose components, such as screws etc., can be left by
accident inside the machine after maintenance is performed. These can cause short circuits,
reduce the performance of the cooling system or increase noise in operation. They can also
damage the machine.
● When carrying out maintenance work, make sure that no foreign bodies are left in or on
● Securely attach all loose parts again once you have completed the maintenance
● Carefully remove any dirt.
Operating conditions and characteristics can vary widely. For this reason, only general
intervals for inspection and maintenance measures can be specified here.
Measurement of the insulation resistance and polarization index in the context of
maintenance work
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 machine.
SIMOTICS TN Series N-compact 1LA8
Operating Instructions 05/2016


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