Lenze 8615E - Manual (Page 122)

120
4 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, there is a defective.
4.1 Checking the mains rectifier
Disconnect inverter from the mains and wait until the DC bus has
discharged (approx. 3 minutes). You can measure directly at the
power terminals.
Measurement Measuring point Measuring value
Diodes in forward
direction L1 → +UG
L2
→
+UG
L3
→
+UG
-UG
→
L1
-UG
→
L2
-UG → L3
≈ 0.4V
≈
0.4V
≈
0.4V
≈
0.4V
≈
0.4V
≈ 0.4V
Diodes in reverse
direction +UG
→
L1
+UG
→
L2
+UG
→
L3
L1
→
-UG
L2 → -UG
L3
→
-UG
high-resistance (OL)
high-resistance (OL)
high-resistance (OL)
high-resistance (OL)
high-resistance (OL)
high-resistance (OL)
4.2 Checking the power stage
Disconnect inverter from the mains and wait until the DC bus has
discharged (approx. 3 minutes).
You can measure directly at the power terminals.
Measurement Measuring point Measuring value
Inverter diode
in forward direction U
→
+UG
V → +UG
W → +UG
≈
0.4V
≈ 0.4V
≈ 0.4V
Diodes in reverse
direction UG
→
U
UG
→
V
UG
→
W
high-resistance
high-resistance
high-resistance
Inverter diode in forward
direction -UG
→
U
-UG
→
V
-UG
→
W
≈
0.4V
≈
0.4V
≈
0.4V
Inverter diode
in reverse direction U
→
-UG
V
→
-UG
W
→
-UG
high-resistance
high-resistance
high-resistance
4.3 Checking the voltage supply on the control
board 8602MP
Inhibit controller
Remarks Measuring point Measuring value
+Vcc 15 Term. 20
→
Term. 40 +14.25 V...+15.75 V
+Vref 10 V Term. 9
→
Term. 40 +9.79 V...+10.21 V
-Vref 10 V Kl. 10 → Term. 40 -9.79 V... -10.21 V