Lenze 9200 Series Operating Instructions Manual page 83

3. Checking the power stage
The measurements described below are to be carried out only by
skilled specialists. Use a digital voltmeter. The measuring values
indicate the nominal value. If they are different from your measure-
ments, there is a defect.
3.1. Checking the mains rectifier
• Disconnect the controller from the mains.
Caution!
Wait 5 minutes until the DC-bus is discharged no load!
• Measure directly at the power terminals.
Measurement Measuring point
L1 → +UG
Diodes in forward
L2 → +UG
direction
L3 → +UG
-UG → L1
-UG → L2
-UG → L3
+UG → L1
Diodes in reverse
+UG → L2
direction
+UG → L3
L1 → -UG
L2 → -UG
L3 → -UG
3.2. Checking the output stage
• Disconnect the controller from the mains.
Caution!
Wait 5 minutes until the DC-bus is discharged!
• Measure directly at the power terminals.
Measurement Measuring point
U → +UG
Inverter diode in forward
V → +UG
direction
W → +UG
UG → U
Inverter diode in reverse
UG → V
direction
UG → W
-UG → U
Inverter diode in forward
-UG → V
direction
-UG → W
U → -UG
Inverter diode in reverse
V → -UG
direction
W → -UG

Measuring value
≈ 0.4V
≈ 0.4V
≈ 0.4V
≈ 0.4V
≈ 0.4V
≈ 0.4V
high resistance (OL)
high resistance (OL)
high resistance (OL)
high resistance (OL)
high resistance (OL)
high resistance (OL)
Measuring value
≈ 0.4V
≈ 0.4V
≈ 0.4V
high resistance
high resistance
high resistance
≈ 0.4V
≈ 0.4V
≈ 0.4V
high resistance
high resistance
high resistance
79