42
AT.654254.050 ver.1.0
Troubleshooting manual
Drive static check
Check the following connections
•
current breakers;
•
rectifier;
•
diode-thyristor modules;
•
DC bus filter;
•
inductance;
•
DC bus capacitors;
•
inverter;
•
diode - transistor module;
•
output filter;
•
inductance;
•
sine filter capacitors;
•
sine filter contactor.
Figure 25 - Example of VSD drawing
Measure with a multimeter in diode mode (input circuit breakers must be ON).
A
1
+
DC
1
+
DC
2
+
INV
1
+
DC
4
+
DC
3
-
DC
B
1
C
1
A
2
B
2
C
2
A
3
B
3
C
3
A
4
B
4
C
4
QF
1
QF
2
QF
3
QF
4
Bridge rectifier
DC
-
link
Inverter
Sine
-
wave filter
Input
Output
U
1
V
1
W
1
U
V
W
Current
circuit
breakers
outs
