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Calibrating the current sensor signal
1.
If the power source has a TIG function, remove fuse 2FU5 from transformer 2TC2.
This disconnects the supply to the HF ignition unit (see the wiring diagram).
2.
Connect the power source to a resistive load.
3.
Connect a calibrated shunt in series with the load.
4.
Set the power source to MMA mode, or use ESAT to set a current reference.
5.
Set a welding current of 400 A.
6.
Load the power source so that the voltage across the load is 35 -- 37 V.
Circuit diagram for current calibration
7.
Measure the shunt voltage (current) by using a calibrated multimeter.
8.
Use potentiometer R21 on circuit board 20AP1 to adjust the shunt voltage to
correspond to 400 A ±4 A.
Position of potentiometer R21 on circuit board 20AP1.
9.
Check the current at low values as well: 16 A at 19 -- 22 V, for which the tolerance is
±1 A. If the current is outside the tolerance, replace current sensor 15AP3.
cu19f3calcur
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S0740 800 191/E080229/P78
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