Lenze MDFQA 132 - Repair

Maintenance/repair
Repair
9

51
BA33.0001 EN 2.0
Procedure
1. Inhibit controller.
2. Disconnect power connection; in the case of terminal box design, disconnect power
supply between inverter and motor.
3. Measure the resistance between the following contacts or terminals:
– Connector size 1.0; M23:
pins U
↔ V, V ↔ W, W ↔ U
– Connector size 1.5; M40:
pins 4
↔ 5, 5 ↔ 6and6 ↔ 4
–Terminalbox:
terminals 1
↔ 2,.2 ↔ 3and3 ↔ 1andU ↔ V, V ↔ W, W ↔ U
4. The mean value calculated from the three measured values corresponds to twice the
phase resistance (star connection).
– Use the mean value as R
1
and R
0
in the following e quation to calculate the
winding temperature
ϑ
1
:
Â
[
°
]
R
1
⋅
2
5
5
ϑ
1
Winding temperature during operation
Â
1
[°C] =
R
1
⋅
2
5
5
R
0
− 235
R
1
Winding resistance at operating temperature
R
0
R
0
Winding resistance at 20°C
9.3 Repair
ƒ It is recommended to have all repairs performed by Lenze Service.
ƒ Delivery of spare parts is available upon request.