Hitachi X200-002SFE/NFU Instruction Manuals page 218

IGBT Test Method
The following procedure will check the inverter transistors (IGBTs) and diodes:
1. Disconnect input power to terminals [R, S, and T] and motor terminals [U, V, and W].
2. Disconnect any wires from terminals [+] and [–] for regenerative braking.
3. Use a Digital Volt Meter (DVM) and set it for 1Ω resistance range. You can check the
Table Legend Almost infinite resistance: ≅ ∞ Ω Almost zero resistance: ≅ 0 Ω
Part
NOTE: The resistance values for the diodes or the transistors will not be exactly the
same, but they will be close. If you find a significance difference, a problem may exist.
NOTE: Before measuring the voltage between [+] and [–] with the DC current range,
confirm that the smoothing capacitor is discharged fully, then execute the tests.
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status of the charging state of terminals [R, S, T, U, V, W, +, and –] of the inverter
and the probe of the DVM by measuring the charging state.
DVM Measured
Value
+ –
D1 [R] [+1] ≅ ∞ Ω
[+1] [R] ≅ 0 Ω
D2 [S] [+1] ≅ ∞ Ω
[+1] [S] ≅ 0 Ω
D3 [T] [+1] ≅ ∞ Ω
[+1] [T] ≅ 0 Ω
D4 [R] [–] ≅ 0 Ω
[–] [R] ≅ ∞ Ω
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Part DVM Measured Part
Value
+ –
D5 [S] [–] ≅ 0 Ω TR3
[–] [S] ≅ ∞ Ω
D6 [T] [–] ≅ 0 Ω TR4
[–] [T] ≅ ∞ Ω
TR1 [U] [+] ≅ ∞ Ω TR5
[+] [U] ≅ 0 Ω
TR2 [V] [+] ≅ ∞ Ω TR6
[+] [V] ≅ 0 Ω
DVM Measured
Value
+ –
[W] [+] ≅ ∞ Ω
[+] [W] ≅ 0 Ω
[U] [–] ≅ 0 Ω
[–] [U] ≅ ∞ Ω
[V] [–] ≅ 0 Ω
[–] [V] ≅ ∞ Ω
[W] [–] ≅ 0 Ω
[–] [W] ≅ ∞ Ω
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