Igbt Test Method - Hitachi WJ200 Series Instruction Manual

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
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.
D1 D2
[R/L1]
[S/L2]
[T/L3]
D4 D5
Table Legend Almost infinite resistance: ≅ ∞ Ω Almost zero resistance: ≅ 0 Ω
Part DVM
– +
D1 [R] [+1]
[+1] [R]
D2 [S] [+1]
[+1] [S]
D3 [T] [+1]
[+1] [T]
D4 [R] [–]
[–] [R]
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.
[PD/+1] [P/+] [RB]
D3
+
D6
TR7
[N/ ]
-
Measured Part DVM
Value
–
≅ ∞ Ω D5 [S] [–]
≅ 0 Ω [–] [S]
≅ ∞ Ω D6 [T] [–]
≅ 0 Ω [–] [T]
≅ ∞ Ω TR1 [U] [+]
≅ 0 Ω [+] [U]
≅ 0 Ω TR2 [V] [+]
≅ ∞ Ω [+] [V]
TR3 [W] [+]
[+] [W]
TR1 TR2
TR4 TR5
Measured Part
Value
+
≅ 0 Ω TR4 [U] [–]
≅ ∞ Ω [–] [U]
≅ 0 Ω TR5 [V] [–]
≅ ∞ Ω [–] [V]
≅ ∞ Ω TR6 [W] [–]
≅ 0 Ω [–] [W]
≅ ∞ Ω TR7 [RB] [+]
≅ 0 Ω [+] [RB]
≅ ∞ Ω [RB] [–]
≅ 0 Ω [–] [RB]
TR3
[U/T1]
[V/T2]
[W/T3]
TR6
DVM Measured
Value
– +
≅ 0 Ω
≅ ∞ Ω
≅ 0 Ω
≅ ∞ Ω
≅ 0 Ω
≅ ∞ Ω
≅ ∞ Ω
≅ 0 Ω
≅ ∞ Ω
≅ ∞ Ω
6−17