Limit values for the stator winding insulation resistance
The following table specifies the measuring voltage and limit values for the insulation
resistance. These values correspond to IEEE 43‑2000 recommendations.
Table 5-1
Stator winding insulation resistance at 40° C
U
N
V
U
meas
V
R
C
MΩ
U ≤ 1000
500
≥ 5
1000 ≤ U ≤ 2500
500 (max. 1000)
100
2500 < U ≤ 5000
1000 (max. 2500)
5000 < U ≤ 12000
2500 (max. 5000)
U > 12000
5000 (max. 10000)
U
rated
= rated voltage, see the rating plate
U
meas
= DC measuring voltage
R
C
= minimum insulation resistance at a reference temperature of 40 °C
Conversion to the reference temperature
When measuring with winding temperatures other than 40° C, convert the measuring value to
the reference temperature of 40° C according to the following equations from IEEE 43-2000.
(1)
R
C
=
K
T
·
R
T
R
C
Insulation resistance converted to 40° C reference temperature
K
T
Temperature coefficient according to equation (2)
R
T
Measured insulation resistance for measuring/winding temperature
T
in °C
(2)
K
T
= (0.5)
(40-T)/10
40
Reference temperature in °C
10
Halving/doubling of the insulation resistance with 10 K
T
Measuring/winding temperature in °C
In this case, doubling or halving the insulation resistance at a temperature change of 10 K is
used as the basis.
● The insulation resistance halves every time the temperature rises by 10 K.
● The resistance doubles every time the temperature falls by 10 K.
Assembly
5.2 Preparations for installation
SIMOTICS FD 1LH1
56
Operating Instructions 01/2019
Summary of Contents for SIMOTICS FD 1LH1
Page 2: ...23 01 2019 19 26 V11 01 ...
Page 28: ...Description SIMOTICS FD 1LH1 28 Operating Instructions 01 2019 ...
Page 122: ...Operation 8 10 faults SIMOTICS FD 1LH1 122 Operating Instructions 01 2019 ...
Page 140: ...Maintenance 9 2 Corrective Maintenance SIMOTICS FD 1LH1 140 Operating Instructions 01 2019 ...
Page 162: ...Disposal 11 5 Disposal of components SIMOTICS FD 1LH1 162 Operating Instructions 01 2019 ...
Page 164: ...Service and Support SIMOTICS FD 1LH1 164 Operating Instructions 01 2019 ...
Page 168: ...Quality documents SIMOTICS FD 1LH1 168 Operating Instructions 01 2019 ...
Page 173: ......