–79–
Simple Checking Procedure for Individual Component of Main Inverter Circuit
[Caution at replacement of inverter parts]
4)
Part name
Inspection method
Diode Stack
Refer to "Determining Diode Stack Troubleshooting" (
¶
[1] (5) 6))
IPM
(Intelligent Power Module)
Rush current protection resistor
R1, R5
Electromagnetic contactor (52C)
DC reactor DCL
Cooling fan (MF1)
Current sensor
ACCT
Refer to "Determining IPM interference" (
¶
[1] (5) 5))
Measure the resistance between terminals: 4.5~5.5k
Ω
Measure the resistance between terminals: 1
Ω
or lower (almost 0
Ω
)
Measure the resistance between terminals and the chassis:
Measure the resistance between terminals : 0.1k~1.5k
Ω
Measure the resistance value at each terminal.
Disconnect the CNCT2 target connector
and check the resistance between
terminals: 35~45
Ω
1-2PIN (U-phase)
3-4PIN (W-phase)
* Check the ACCT connecting phase and direction.
U
Check Location
A1-A2
1/L1-2/T1
3/L2-4/T2
5/L3-6/T3
Judgement value
0.1k~1.3k
Ω
A2
1/L1
3/L2
5/L3
2/T1
4/T2
6/T3
A1
W ACCT-W
ACCT-U
U
V
IPM
W
Transformar (To1)
Measure the resistance between terminals on the primary side (CNTR1) : 1.0k~2.5k
Ω
Measure the resistance between terminals on the secondary side (CNTR) : 20~60
Ω
1
Carefully check the wiring for loose and incorrect connections, for incorrect or loose connection of the power circuit
wiring such as IPM and diode module causes damage to the IPM. Since loose screws are difficult to find, tighten
them all after finishing all other works. When wiring the base for IPM, follow the wiring diagram below carefully.
2
and fix the module securely with the screw for fastening.
As the radiation grease attached on the wiring terminal causes poor contact, wipe it off.
Apply a thin layer of grease evenly to the entire surface,
Coat evenly with the grease provided the heat radiation surface of IPM/diode modules.
