Mitsubishi Electric CITY MULTI PQRY-P200YMF-C Service Handbook page 88

6) Individual Parts Failure Judgment Methods.
Part Name
Diode Stack (DS)
Intelligent Power Module(IPM)
Electromagnetic Contactor (52C)
Rush Current Protection Resistor (R1, 5)
DC Reactor (DCL)
Cooling Fan (MF1)
Transformer (T01)
AC Current sensor (ACCT)
[Caution at replacement of inverter parts]
1 IPM and G/A board should be replaced together at the same time.
When the IPM is damaged, the G/A board may possibly be broken, and the use of the broken G/A board damages
the normal IPM. Therefore, replace the IPM and G/A board together at the same time. However, if the G/A board is
damaged, judge that the IPM is faulty, then judge whether replacement is necessary or not.
2 Fully check wiring for incorrect and loose connection.
The incorrect or loose connection of the power circuit part wiring like IPM and diode module causes to damage 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 care-
fully as it has many terminals.
Coat the grease for radiation provided uniformly onto the radiation surface of IPM /diode modules.
3
Coat the grease for radiation 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 "Judging Diode Stack Failure."
Refer to "Judging IPM Failure."
Measure the resistance value at each terminal.
A1 A2
1/L1 3/L2 5/L3
2/T1 4/T2 6/T3
Measure the resistance between terminals: 4.5k~5.5kΩ
Measure the resistance between terminals: 1 Ω or lower
Measure the resistance between the 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
Measure the resistance between terminal between 1pin and 2pin, 3pin and
4pin : 35 ~ 45 (Ω)
–87–
Judgment Method
Check Location Judgment Value
A1-A2
1/L1-2/T1
3/L2-4/T2
5/L3-6/T3
0.1k~1.3kΩ
∞