Commissioning; Insulation Resistance; Testing The Insulation Resistance - Siemens SIMOTICS SD Operating Instructions Manual

Commissioning

7.1

Insulation resistance

7.1.1

Testing the insulation resistance

Hazardous voltage at the terminals
Only appropriately trained personnel may carry out this work.
Hazardous voltages are sometimes present at the terminals during and immediately after
measurement of the winding insulation resistance. If you touch the terminals, this can result
in death, serious injury or material damage.
If any power cables are connected, check to make sure line supply voltage cannot be
connected. To discharge the winding, after measuring the insulation resistance, connect the
winding to ground potential.
NOTICE
Short-circuit
Material damage can occur if you do not apply the following measures:
• Check the insulation resistance before commissioning and after any extended periods of
• Before measuring the insulation resistance, read the operating manual for the insulation
• Disconnect any connected main-circuit cables from the terminals before measuring the
Note
If the critical insulation resistance is less than or equal to this value, the windings must be
dried or, if the fan is removed, cleaned thoroughly and dried.
Please note that the insulation resistance of dried, clean windings is lower than that of warm
windings. The insulation resistance can only be properly assessed after conversion to the
reference temperature of 25 °C.
Note
If the measured value is close to the critical value, you must check the insulation resistance
at suitably frequent intervals.
Low-voltage motors
Operating Instructions, 05/2014, 5 610 00000 02 000
WARNING
storage or periods during which the equipment is not operational.
resistance meter you are going to use.
insulation resistance.
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