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Assembly
5.2 Preparing for installation
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.
Limit values for the winding insulation resistance
The following table specifies the measuring voltage and limit values for the insulation
resistance. These values correspond to the recommendations of IEC 60034-27-4 and
IEEE 43-2000.
Table 5- 1
U
rated
U
meas
R
= minimum insulation resistance at a reference temperature of 40 °C
C
174
non-hazardous level
Insulation resistance of the winding at 40 °C
U
N
V
U ≤ 1000
1000 ≤ U ≤ 2500
2500 < U ≤ 5000
5000 < U ≤ 12000
U > 12000
= rated voltage, see the rating plate
= DC measuring voltage
U
meas
V
500
500 (max. 1000)
1000 (max. 2500)
2500 (max. 5000)
5000 (max. 10000)
操作说明, 11/2022, A5E52373573A
R
C
MΩ
≥ 5
100
1LE8 轴高 80 ... 355
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