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4.3 Checking the IGBTs, dynamic test
Always carry out the dynamic test of the IGBTs after each repair.
Before beginning the test:
1. Remove the motor cable.
2. Set the multimeter to 1000 VAC.
3. Switch on the mains supply.
4. Set CUE to a frequency of 50 Hz.
5. Switch on CUE.
4.4 Checking the intermediate voltage
The intermediate voltage must be approx. 1.38 × mains voltage
(VAC).
Enclosure A
TM03 9014 2807
Measure voltages:
• between terminals U and V
• between terminals V and W
• between terminals U and W.
The voltages measured must be 360-380 V and may deviate from each
other by ± 1.5 %.
If the measurements deviate by more than ± 1.5 %, an IGBT is
defective, and the power board must be replaced.
Terminals in enclosures A2 and A3 (shown with mains
supply cable connected).
Enclosure A5 has similar terminals.
Enclosure B
The voltages measured must be 360-380 V and may deviate from each
other by ± 1.5 %.
If the measurements deviate by more than ± 1.5 %, an IGBT is
defective, and the power board must be replaced.
Enclosure C
The voltages measured will be 450 ± 25 V when CUE is set to 50 Hz/
1500 rpm and connected to a 400 V voltage supply.
If the measurements deviate by more than ± 1.5 %, an IGBT is
defective, and the power board must be replaced.
Alarm/warning limits
Voltage supply 3 x 200-240 V 3 x 380-500 V 3 x 525-600 V
Overvoltage 410 VDC 855 VDC 975 VDC
Voltage warning high 390 VDC 810 VDC 943 VDC
Voltage warning low 205 VDC 410 VDC 585 VDC
Undervoltage 185 VDC 373 VDC 532 VDC
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