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TESTING OF THE PRE-INVERTER (PFC)
1. Disconnect cooling fans (A001/X9).
2. Disconnect (HF, Spark generator card) A003/X8.
3. Connect jumpers A001/X14 (overvoltage) and A001/X16 (main switch open) on control card
A001.
4. Connect jumpers X17/(1-4) and X17/(3-6) on Z004.
5. Disconnect Z004/X6. In the newer model where X4 contains two cables, remove theX6 cable
going to A002/X1.
6. Connect Kemppi Multipower with 22 VAC with current limit 2,5 A between phases L2, L3
7. Connect Kemppi MLS- Service power DC+ = 560Vdc to wire connector X6 and DC- to Z004/X8
(X6=560V, X8=0V). Again in newer model, connect DC+ to X6 cable going to A002/X1.
8. Switch on Multipower and MLS-Service power. Turn the machine on.
9. Put machine to TIG mode. Measure DC -link voltage from Z004/X8 and X4 pads.
10. DC -link voltage should raise to 720-740 VDC. You can discharge the DC-link with changing to
MMA mode and back to TIG.
11. If voltage raises and stops to 720Vdc the pre-inverter is OK.
12. Restore jumpers and wires .
X17/1-4
X17/3-6
Measurements
X8
X4
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