Kemppi MasterTig MLS 3003 ACDC - MLS 3003 ACDC Specifications

23
Measurements
Z004 Pre-inverter, IGBT:
- Power should be off !
- With these measurements you can find short circuits and partly open circuits that indicates fault in
the machine.
- Measure diodes in forward and reverse direction. Forward diode threshold voltage is ~0,4 V, reverse
direction infinite.
- Measuring points have been marked in the picture below. Four (4) measurements must be
conducted to be sure of correct operation of Z004.
Diodes* Measuring points Value
1. 8 -> 12 ~ 0,4 V
2. 2 -> 22 ~ 0,4 V
3. 4 -> 14 ~ 0,4 V
4. 4 -> 17 ~ 0,4 V
14
17
12
10
8
6
4
2
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22
Diode 3.
Diode 1.
* Diodes marked with red color in the right hand picture.
1.
2.
3.
4.
Diode 1.
Diode 3.