Hitachi WJ200-001S Instruction Manual page 322

Wj200 series single/three-phase inputs 200v/400v class

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Table of Contents

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

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.

Table Legend Almost infinite resistance:  ∞ Ω Almost zero resistance:  0 Ω

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]

TR7 [RB] [+]

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