Mig Mode; Jog Mode; Weld Status; Mig Gun-On-Demand - Miller Millermatic 350P Technical Manual

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The first time the welding power source is energized it starts in MIG welding mode. Each time after the initial startup, when the unit is turned off,
whatever mode and parameter settings were last set will remain as the current settings the next time the unit is energized.

5-2. MIG Mode

In MIG mode, VOLTS is lit under left display and WIRE SPEED is lit under right display. Left knob is used to adjust welding voltage within a range of
10-32 volts, and right knob is used to adjust wire feed speed within a range of 25-700 IPM. Refer to weld chart in front compartment for proper parameter
settings according to wire type, shielding gas, and material type and thickness.

5-3. Jog Mode

If gun trigger is pressed and held for more than 3 seconds without striking an arc, unit will automatically shut off weld power. For MIG guns, shielding gas
will shut off after 1 minute, and for spool guns, shielding gas will continue to flow because gas valve is located inside spool gun. For MIG guns, wire will
feed for up to 2 minutes while trigger is pressed, then wire drive system in unit will automatically shut off. For spool guns, wire will feed for up to 30
seconds before shutting off. If gun trigger is pressed for 3 seconds without striking an arc the displays will show JOG MODE. Jog speed for a MIG gun is
800 ipm (20.3 mpm). Jog speed for a push/pull gun is 300 ipm (7.6 mpm).

5-4. Weld Status

When trigger is released on a MIG gun, spool gun, or push-pull gun, the last actual amperage and voltage will be shown on the displays for 5 seconds.
The VOLTS and AMPS indicator lights will illuminate under the displays and each value will appear in the corresponding display.
If a programmed value requires adjustment after the arc is extinguished and during the 5 seconds display of actual values, turning either knob will cause
actual values in the displays to be replaced by programmed values for adjustment purposes.
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The 5 second delay after the arc is extinguished for displaying actual weld values can be turned on or off in the Timer menu DISP selection (see
Section 6-3).

5-5. MIG Gun-On-Demand

The guns that can be used with this unit are MIG guns, spool guns, and push-pull guns. To switch from one gun to another, momentarily press the trigger
on the desired unused gun to make it the active gun. Once the trigger is pressed, the unit will recall stored data and both displays will show the last
programmed values for that particular gun. If the unit is powered down and back on again, the gun last used will become the current active gun.

5-6. Pulse MIG Mode Voltage Adjustment

In Pulse MIG mode there is no manual voltage adjustment; instead, voltage is synergically aligned with the proper wire feed speed. Arc Length adjust-
ment is used to adjust actual arc length which automatically adjusts the voltage. See weld chart in front compartment for proper wire feed speed
adjustment according to wire size and type.

5-7. Pulse MIG Gun-On-Demand

The spool gun functions slightly different in Pulse MIG mode. To switch from one gun to another, momentarily press the trigger on the desired unused
gun to make it the active gun. Once the trigger is pressed, the unit will recall stored data and both displays will show the last programmed values for that
particular gun. For a spool gun, the wire speed is taken from the position of the gun potentiometer. This wire speed value is automatically adjusted if the
potentiometer is moved since the last time the gun was active. If the unit is powered down and back on again, the gun last used will become the current
active gun.

5-8. Tip Saver

If gun contact tip is directly shorted to the workpiece while gun trigger is pressed, the welding arc automatically shuts off after 1 second to prevent wire
burnback in the contact tip.
TM-1327 Page 22 Millermatic 350