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For a winding temperature of approx. 25° C, the minimum insulation resistances are 20 MΩ
(U ≤ 1000 V) or 300 MΩ (U > 1000 V). The values apply for the complete winding to ground.
Twice the minimum values apply to the measurement of individual assemblies.
● Dry, new windings have an insulation resistance of between 100 and 2000 MΩ, or possibly
even higher values. An insulation resistance value close to the minimum value could be
due to moisture and/or dirt accumulation. The size of the winding, the rated voltage and
other characteristics affect the insulation resistance and may need to be taken into account
when determining measures.
● Over its operating lifetime, the motor winding insulation resistance can drop due to ambient
and operational influences. Calculate the critical insulation resistance value depending on
the rated voltage by multiplying the rated voltage (kV) by the specific critical resistance
value. Convert the value for the current winding temperature at the time of measurement,
see above table.
Measuring the polarization index
1. To determine the polarization index, measure the insulation resistances after one minute
and ten minutes.
2. Express the measured values as a ratio:
PI =
R
insul 10 min
/
R
insul 1 min
Many measuring devices display these values automatically following the measurement.
For insulation resistances > 5000 MΩ, the measurement of the PI is no longer meaningful and
consequently not included in the assessment.
R
(10 min)
/ R
(1 min)
Assessment
≥ 2
Insulation in good condition
< 2
Dependent on the complete diagnosis of the insulation
NOTICE
Damage to insulation
If the critical insulation resistance is reached or undershot, this can damage the insulation
and cause voltage flashovers.
● Contact the service center (Page 111).
● If the measured value is close to the critical value, you must subsequently check the
insulation resistance at shorter intervals.
Limit values of the anti-condensation heating insulation resistance
The insulation resistance of the anti-condensation heating with respect to the machine housing
should not be lower than 1 MΩ when measured at 500 V DC.
Assembly
5.1 Preparations for installation
SIMOTICS HV C 1NB1402-2AA84-4CA0-Z
Operating Instructions 06/2018
43
Содержание 1NB1402-2AA84-4CA0-Z
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Страница 10: ...Table of contents SIMOTICS HV C 1NB1402 2AA84 4CA0 Z 10 Operating Instructions 06 2018 ...
Страница 22: ...Description SIMOTICS HV C 1NB1402 2AA84 4CA0 Z 22 Operating Instructions 06 2018 ...
Страница 84: ...Operation 8 9 Faults SIMOTICS HV C 1NB1402 2AA84 4CA0 Z 84 Operating Instructions 06 2018 ...
Страница 110: ...Disposal 11 4 Disposal of components SIMOTICS HV C 1NB1402 2AA84 4CA0 Z 110 Operating Instructions 06 2018 ...
Страница 112: ...Service and Support SIMOTICS HV C 1NB1402 2AA84 4CA0 Z 112 Operating Instructions 06 2018 ...
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Страница 131: ...C 2 Declaration of conformity SIMOTICS HV C 1NB1402 2AA84 4CA0 Z Operating Instructions 06 2018 131 ...
Страница 132: ...Quality documents C 2 Declaration of conformity SIMOTICS HV C 1NB1402 2AA84 4CA0 Z 132 Operating Instructions 06 2018 ...
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Страница 150: ...Additional documents SIMOTICS HV C 1NB1402 2AA84 4CA0 Z 150 Operating Instructions 06 2018 ...
Страница 154: ...Index SIMOTICS HV C 1NB1402 2AA84 4CA0 Z 154 Operating Instructions 06 2018 ...
Страница 155: ...AF Einbauerklärung Loher LDX U157 AJ EC Declaration of Conformity U161 ...