6) Individual Parts Failure Judgment Methods.
[Caution at replacement of inverter parts]
1The IPM and G/A board should be replaced together at the same time.
2Fully check wiring for incorrect and loose connection.
3Coat the grease for radiation provided uniformly onto the radiation surface of IPM/diode modules.
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.
Part Name Judgment Method
Diode Stack (DS) Refer to “Judging Diode Stack Failure.” (P49)
Intelligent Power Module (IPM) Refer to “Judging IPM Failure.” (P49)
Electromagnetic Contactor (52C) Measure the resistance value at each terminal.
DC Reactor (DCL) Measure the resistance between terminals: 1Ω or lower
Measure the resistance between the terminals and the chassis: ∞
Cooling Fan (MF1) Measure the resistance between terminals: 0.1K~1.5KΩ
POWER board Measure the resistance valve at between each terminal, and between
each terminal and case.
Check Location Judgment Value
0-1 50~100kΩ
2-4 6-8 ∞
10-12 14-16
Check Location Judgment Value
FN 3-6, FN 2-4
FN 1-2, FN 2-3,
FN4-6
FN1, FN2, FN3,
FN4, FN6-Case
Under 1Ω
∞
∞
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
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 carefully as it has many terminals.
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