Mitsubishi City Multi PURY-P400 Service Handbook page 80

4)
Simple Checking Procedure for Individual Component 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
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
Coat evenly with the grease provided the heat radiation surface of IPM/diode modules.
Apply a thin layer of grease evenly to the entire surface,
As the radiation grease attached on the wiring terminal causes poor contact, wipe it off.
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)
and fix the module securely with the screw for fastening.
–79–
Inspection 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