Mitsubishi Electric PQRY-P200YEM-A Service Handbook page 100

(4) Simple Checking Procedure for Individual Components of Main Inverter Circuit
Part name
Diode Stack
IPM
(Intelligent Power Module)
Rush current protection resistor
R1, R5
Electromagnetic contactor (52C)
DC reactor DCL
Cooling fan (MF1)
Transformar (To1)
Current sensor
ACCT
[Caution at replacement of inverter parts]
1
Fully check wiring for loose and incorrect connections.
The incorrect or loose connection of the power circuit part wiring like IPM and diode module causes damage to the
IPM. Therefore, check the wiring fully. As the insufficient tightening of screws is difficult to find, tighten them together
additionally after finishing other works. For the wiring of the base for IPM, observe the wiring diagram below
carefully as it has many terminals.
2
Coat the grease provided uniformly onto the heat radiation surface of IPM /diode modules.
Coat the grease on the full surface in a thin layer, 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 if attached.
Refer to "Determining Diode Stack Troubleshooting"
Refer to "Determining IPM interference"
Measure the resistance between terminals: 4.5~5.5kΩ
Measure the resistance value at each terminal.
A2 A1
1/L1 3/L2 5/L3
2/T1 4/T2 6/T3
Measure the resistance between terminals: 1Ω or lower (almost 0Ω)
Measure the resistance between terminals and the chassis:
Measure the resistance between terminals : 0.1k~1.5kΩ
Measure the resistance between terminals on the primary side (CNTR1) : 1.0k~2.5kΩ
Measure the resistance between terminals on the secondary side (CNTR) : 20~60Ω
Disconnect the CNCT2 target connector
and check the resistance between
terminals: 35~45Ω
1-2PIN (U-phase)
3-4PIN (W-phase)
–99–
Judgement method
(¶
(¶ [1] (5) 5))
Check Location
A1-A2
1/L1-2/T1
3/L2-4/T2
5/L3-6/T3
ACCT-U
U
Check the ACCT connecting phase and direction.
[1] (5) 6))
Judgement value
0.1k~1.3kΩ
U W ACCT-W
V W
IPM