SJ200 Inverter
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 [RB] 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, RB, +, and
[+1] [+] | [RB] |
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D1 D2 D3 | TR1 | TR2 | TR3 |
[R] |
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| [U] | ||
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[S] |
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[T] |
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Troubleshooting Maintenance and
| D4 |
| D5 | D6 | TR7 | TR4 |
| TR5 |
| TR6 |
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Table Legend – Almost infinite resistance: ≅ ∞ Ω | Almost zero resistance: ≅ 0 Ω | ||||||||||||||
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Part | DVM |
| Measured | Part | DVM | Measured | Part | DVM | Measured | ||||||
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+ |
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| Value | + | – |
| Value | + | – | Value | |||
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D1 | [R] |
| +1 |
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| ≅ ∞ Ω | D5 | [S] | [N] |
| ≅ 0 Ω | TR4 | [U] | ≅ 0 Ω | |
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| +1 |
| [R] |
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| ≅ 0 Ω |
| [N] | [S] |
| ≅ ∞ Ω |
| [U] | ≅ ∞ Ω | |
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D2 | [S] |
| +1 |
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| ≅ ∞ Ω | D6 | [T] | [N] |
| ≅ 0 Ω | TR5 | [V] | ≅ 0 Ω | |
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| +1 |
| [S] |
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| ≅ 0 Ω |
| [N] | [T] |
| ≅ ∞ Ω |
| [V] | ≅ ∞ Ω | |
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D3 | [T] |
| +1 |
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| ≅ ∞ Ω | TR1 | [U] | [+] |
| ≅ ∞ Ω | TR6 | [W] | ≅ 0 Ω | |
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| +1 |
| [T] |
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| ≅ 0 Ω |
| [+] | [U] |
| ≅ 0 Ω |
| [W] | ≅ ∞ Ω | |
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D4 | [R] |
| [N] |
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| ≅ 0 Ω | TR2 | [V] | [+] |
| ≅ ∞ Ω | TR7 | [RB] | [+] | ≅ 0 Ω |
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| [N] |
| [R] |
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| ≅ ∞ Ω |
| [+] | [V] |
| ≅ 0 Ω |
| [+] | [RB] | ≅ ∞ Ω |
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| TR3 | [W] | [+] |
| ≅ ∞ Ω |
| [RB] | ≅ 0 Ω | |
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| [+] | [W] |
| ≅ 0 Ω |
| [RB] | ≅ 0 Ω | |
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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