Lincoln Electric INVERTEC SVM158-A - Manual (Page 98)

TROUBLESHOOTING AND REPAIR
VOLTAGE AND CURRENT CALIBRATION PROCEDURE (continued)
F-48 F-48
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CALIBRATION CHECK
The calibration of the V350-PRO can be checked
using a resistive load bank with the V350-PRO in
mode 200. Mode 200 is a constant current test
mode.
1. Press and hold in the Mode Select button.
2. Turn on the V350-PRO.
3. Rotate the output knob, while still holding the
mode select button in, until the displays read
“mode 200”. NOTE: Machines with an
Advanced Process Panels do not have a mode
select button. Use the same procedure except
hold in the Memory button on the advanced
process panel instead of the mode select but-
ton.
4. Release the Mode Select/Memory button and
the machine will be in mode 200.
5. With the machine in mode 200 apply a resistive
load to the welding output terminals (approxi-
mately .087 ohms) set the machine output to
300 amps and enable the Weld Terminals.
(Weld Terminals Select ON).
6. Using the test meters note the output voltage
and current.
7. The V350-PRO voltmeter must match the test
meter reading to within +/- 1 volt.
8. The V350-PRO ammeter must match the test
meter within +/- 5 amps.
9. If the voltmeter does not meet the specification
then proceed to the Voltage Calibration
Procedure.
10. If the ammeter does not meet the specification
then proceed to the Current Calibration
Procedure.
NOTE: Before attempting to calibrate the voltage
or current setting of the V350-PRO, be sure to read
the entire voltage or current calibration section. If
the steps are not completed quickly, the machine
will automatically leave the calibration mode with-
out changing the calibration settings. The voltage
and current calibration settings of the V350-PRO
are completely independent of each other.
Adjusting one will not affect the other.
VOLTAGE CALIBRATION
1. Connect the resistive load band (approximate-
ly .087 ohms) and test voltmeter to the welding
output terminals.
2. Press and hold in the Mode Select/Memory
button.
3. Turn on the V350-PRO.
4. Rotate the Output Control knob until the dis-
play reads “vol cAL”.
5. Release the Mode Select/Memory button.
6. Adjust the output control knob until the actual
output voltage reading on the test volt meter is
20volts +/- .5 volts.
7. Wait for the machine’s output to be automati-
cally turned off and then back on.
8. Adjust the Output Control knob again if neces-
sary to make the actual voltage output 20 volts
+/- .5 volts.
9. Wait for the machine’s output to be automati-
cally turned off and then back on.
10. Repeat the above two steps if necessary.
11. Press and release the Mode Select/Memory
button to save the calibration.
NOTE: If the Mode Select/Memory button is
not pressed within 30 seconds after adjusting
the Output Control knob the machine will leave
the calibration mode and use the previous cal-
ibration settings.