Calibrating The Current Sensor Signal - ESAB Aristo Mig 3001i Service Manual

Calibrating the current sensor signal

1. Connect the power source to a resistive load.
2. Connect a calibrated shunt in series with the load.
3. Set the power source to MMA mode.
4. Set a welding current of 100 A.
5. Load the power source so that the voltage across the load is 24 V.
Circuit diagram for the current calibration
6. Measure the shunt voltage using a calibrated multimeter.
7. Using potentiometer R21 on circuit board 20AP1, adjust the shunt voltage to
correspond to 100 A $1 A.
Position of potentiometer R21 on circuit board 20AP1.
8. 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.
ca41f2calcur - 57 -
S0740 800 196/E101019/P76