The calibration of the Power Mig 300 can be
checked using a resistive load bank with the
Power Mig 300 in mode 200. Mode 200 is a con-
stant current test mode.

1. Toggle and hold the mode select switch in the

up position.

2. Turn on the Power Mig 300.

3. Rotate the output knob, while still holding the

mode select switch up, until the display reads
“ALL nodE”.

4. Release the mode select switch, toggle the

mode switch one more time, then toggle the
MODE SET switch until the MSPlll panel
reads 200. Disengage the idler arm on the
wire drive so no wire will feed.

5. With the machine in mode 200 apply a resis-

tive to the welding output terminals (approx.
.106 ohms) set the machine output to 250
amps and enable the weld terminals by
pressing the trigger switch.

6. Using the test meters note the output voltage

and current.

7. The Power Mig 300 voltmeter must match the

test meter reading to within +/- 1 volt.

8. The Power Mig 300 ammeter must match the

test meter within +/- 5 amps.

9. If the volt meter does not meet the specifica-

tion then proceed to the

Voltage Calibration

Procedure

10. If the ammeter does not meet the specifica-

tion then proceed to the

Current Calibration

Procedure

NOTE

: Before attempting to calibrate the voltage

or current setting of the Power Mig, be
sure to read the entire voltage or current
calibration procedure. If the steps are not
completed quickly, the machine will auto-
matically leave the calibration mode with-
out changing the calibration settings. The
voltage and current calibration settings of
the Power Mig are completely indepen-
dent of each other. Adjusting one will not
affect the other.

VOLTAGE CALIBRATION

1. Connect the resistive load bank (approximate-

ly .106 ohms or 250 amps) and test voltmeter
to the welding output terminals.

2. Toggle and hold in the mode select switch in

the up position.

3. Turn on the Power Mig 300.

4. Rotate the right hand output control knob until

the display reads “vol cAL”.

5. Release the mode select switch.

6. The left display will change to “VcAL” to indi-

cate that voltage calibration is in progress.

7. The right hand display will scroll the following

message: Adj rEnc SorEAL vol = 20V.

8. Adjust output control knob until the actual out-

put voltage reading on the test volt meter is 20
volts +/- .5 volts.

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