Chapter 6
– Troubleshooting and Maintenancet
6-9
2) Diode module and IGBT module check (37~ 90kW)
Turn the power off and disconnect RST/UVW wiring.
Determine whether inverter terminals (R,S,T, U, V, W, P1(or P2),N) are
energized or not using a tester.
Wait until the Main Electrolytic Capacitors (DCP-DCN) is discharged to a safe
level.
Enormous amount of value such as Mega will be displayed when Open.
When closed, the resistance value ranges from a few ohms to tens of
.
Sometimes, it seems to be closed due to electrolytic capacitors but soon to
be displayed mega value resistance.
The displayed value is not always the same according to modules and tester
types but should be similar.
Modules number and checking point
Module
Test polarity
Check
value
Number
Test polarity
Check
value
+
-
+
-
Diode
D1
R
DCP+
Closed
D4
R
N
Open
DCP+
R
Open
N
R
Closed
D5
S
N
Open
D6
T
N
Open
N
S
Closed
N
T
Closed
IGBT
Tr1
U
DCP
Closed
Tr4
U
N
Open
DCP
U
Open
N
U
Closed
Tr3
V
DCP
Closed
Tr6
V
N
Open
DCP
V
Open
N
V
Closed
Tr5
W
DCP
Closed
Tr2
W
N
Open
DCP
W
Open
N
W
Closed
Charge
resistor
R
S
T
U
V
W
SCR1
+
Electrolytic
capacitor
D
C
P
N
T
r
3
Tr6
Tr5
Tr2
T
r
1
Tr4
D
C
P
+
SCR2 SCR3
D4
D5
D6
Charge
diode
D1
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