Lenze SDSGA - Manual (Page 28)

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 LLL047 28.7 86
SDSG LLL056 13.1 39.6
SDSG LLL063−22 6.7 20
SDSG LLL063−32 3.8 11.4
Tab. 3 Winding resistances of servo motors (between two terminals)