26
Measurements
TESTING OF THE POWER STAGE
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. Remove insulation plate from the top of Z003.
5. Disconnect Z004/X7 and Z004/X6 to A002/X1. Leave X8 connected.
Check again for correct cable !!!
(In older models there is two different pads on Z004, X4 and X6. Disconnect X6)
6. Connect MLS-Service power DC+ (= 560Vdc) to wire connector X6 (goes to A002) and DC- to
Z004/X8 (X6=560V, X8=0V).
7. Connect Kemppi Multipower with 98 Vdc (24+24+50 Vdc in series) between phases L2, L3.
8. Switch on MLS- Service power and check the panel functionality.
9. Switch on Multipower. Turn mains switch on.
10. Set the machine to MMA mode.
11. Measure following voltages (X8 = GND = -Dix) from Z003.
• heat sink = + 9 … 11 Vdc
• X5 = - 9 … 11 Vdc
• X7 = + 62 ... 75 Vdc (refers to DC+ voltage if err 6 is reported)
• X9 = - 58 ... 75 Vdc (refers to DC- voltage if err 6 is reported)
• If voltages are OK then power stage and rectifier are OK.
12. Switch off machine, Multipower and MLS Service power.
13. Disconnect power supplies.
14. Restore jumpers and wires.
X9
X5
X8
X7
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