-- 5 9 --cdte1de1
The control voltages to the AC IGBTs can be checked in this and next test position: see
page 60. The polarity command comes from AP04: see page 45.
This tests AP07, AP09, AP10, Q1--Q4 and parts of AP01.
10. Set the selector switch to position 3: CHANGED POL.
The voltage must be --17 to --20V.
This tests AP07, Q01-- Q04 and cabling for the reversed polarity.
11. Set the selector switch to position 4: MOD ON.
The primary IGBT Q5 is activated. The voltage must be 3 to 5V.
This tests AP01, AP02, AP11, AP12, Q05 and cabling.
12. Set the selector switch to position 5: MOD AND AUX.
The meter now displays a voltage which is about 25% higher t han in the previous test.
The additional voltage is a rectified voltage from a separate secondary winding on the
main transformer TM01. See description on page 18.
This tests T M01, AP01 and cabling.
13. Set the selector switch to position 6: MOD CHA. POL.
The meter displays the same voltage as in item 11 above, but with reversed polarity.
Differences up to ±0.3V may occur.
14. If all the test values are correct, disconnect the machine from the mains and disconnect
the external DC supply. Reconnect wires 090 and 007. Note: 090 must be connected to
the negative of t he rectifier and 007 to the positive.
Do not disconnect the test board. Set up the test board and the multimeter as described in
item 7 above. To improve the accuracy of the measurements, connect a 5.6kΩ 5W
resistor in parllel with the multimeter. Those measurements are shown in the right--hand
column of the table below.
Note: The voltages measured at e, f and g below depend on the mains voltage.
a. Switch on the mains. LEDs MAINS, TEMP and DC FAIL will briefly light up, and
then all except MAINS will go out.
Switch position
Voltmeter
reading
Vo ltmeter reading
with 5.6kΩ in //
b.
1: OFF 0V 0V
c.
2:TESTON +17to+20V +17to+20V
d.
3: CHANGED POL --17 to --20V --17 to --20V
e.
4: MOD ON +70 to +90V +60 to +75V
f.
5: MOD AND AUX +100 to +120V +95 to +120V
g.
6: MOD CHA. POL --70 to --90V --60 to --75V
If all test values are correct, reset the machine for normal operation and make a test weld.
If some tests fail and it is unclear whether the fault is in the AC or DC part of the machine,
convert the machine to a DC machine, as described on page 66.
Then perform the softstarting procedure above, except that items 10, 13, 14.d and 14.g are
not relevant for a DC machine.
When working as a DC machine, circuit boards AP07, AP09 and AP10 are bypassed.
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