Maintenance/repair
Temperature monitoring
7
l
28
BA 13.0008 − EN 2.1
7
Maintenance/repair
{
Danger!
ƒ
Ensure that no voltage is applied to the drive system while working on it!
ƒ
High temperatures of the motor surfaces. Observe cooling times!
ƒ
Unload motor or secure loads which are applied to the drive!
ƒ
Ensure that no foreign particles ingress into the motor!
7.1
Temperature monitoring
If the surface temperatures are higher than usual, it might be necessary to check the
actual winding temperature:
ƒ
Detect the winding temperature by means of a 4−conductor resistance
measurement at the motor power connections.
ƒ
The resistance should be measured immediately after switch−off and standstill of
the motor.
Procedure
1. Remove the plug−in connector X10. For terminal box designs, interrupt the power
supply between inverter and motor.
2. Measure the resistance between the following contacts or terminals:
– Plug−in connector X10:
Contacts 4
«
5, 5
«
6 and 6
«
4
– Terminal box X11:
Terminals 1
«
2, 2
«
3 and 3
«
1
3. The mean value calculated from three measuring values equals the double phase
resistance (star connection).
– Enter the mean value as "R
2
" in the following formula and calculate the winding
temperature "
J
2
" ( "R
1
" from Tab. 3):
í
2
[°C]
+
R
2
y
255
R
1
y
235
Motor type
Winding resistance
D
230V
Y 390V
SDSG
LLL
047
28.7
86
SDSG
LLL
056
13.1
39.6
SDSG
LLL
063−22
6.7
20
SDSG
LLL
063−32
3.8
11.4
Tab. 3
Winding resistances of servo motors (between two terminals)
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