Chapter 8 - Troubleshooting & Maintenance
186
8.4 How to Check Power Components
Before checking the power components, be sure to disconnect AC Input supply and wait until the Main Electrolytic
Capacitors (DCP-DCN) discharge.
n
Diode Module Check
Check point
Resistance to be Good
R, S, T – P1
50 k ohms or more
R, S, T – N
50 k ohms or more
n
Charge Resistor Check
Check point
Resistance to be Good
Contactor terminals
Depending on model
n
DB (Dynamic Braking) IGBT (Option)
Check point
Resistance to be Good
B2 - N
50 k ohms or more
G - N
A few kilo ohms
n
IGBT Module Check
Check point
Resistance to be Good
B2 - N
50 k ohms or more
G - N
A few kilo ohms
R
G
E
G
E
G
E
G
E
G
E
G
E
S
T
U
V
W
G
E
P1
P2
B1
N
Dynamic Braking Unit (Option) for 15~30HP models
N
Charge resistor
Contactor
+
Electrolytic
capacitors
B2
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