Special Features - Miller Millermatic 355 Owner's Manual

6-2.

Special Features

MIG Mode In MIG mode, the left knob is used to adjust welding voltage within a range of 12 to 32 volts in low range (208–240
volts) single phase. The voltage range will be 12 to 34 volts in high range (460–575 volts) single phase. The voltage
range will be 12–34 volts for all input voltages on three phase. The right knob is used to adjust wire feed speed with-
in a range of 50 to 800 IPM.
Pulsed MIG Mode Volt- In Pulsed MIG mode there is no manual voltage adjustment; instead, voltage is synergically aligned with the proper
age Adjustment wire feed speed. Arc Length adjustment is used to adjust actual arc length, which automatically adjusts the voltage.
See P. chart in section 6-8 for proper wire feed speed adjustment according to wire size and type.
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, shielding gas and ramp wire feed speed to Jog speed. Trigger error will be displayed after preset length
of wire is fed, dependent on MIG gun selected.
Weld Status When trigger is released on a MIG gun, spool gun, or push-pull gun, the last actual amperage and voltage are
shown on the display for 5 seconds. If a programmed value requires adjustment after the arc is extinguished and
during the 5-second display of actual values, turning either knob will cause actual values in the displays to be re-
placed by programmed values for adjustment purposes.
MIG Gun-On-Demand MIG guns, spool guns, and push-pull guns can be used with this unit. To switch from one gun to another, momentar-
ily press the trigger on the desired unused gun to make it the active gun. Once the trigger is pressed, the unit will re-
call stored data and the display 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.
Output Foldback When operating the Millermatic 355 on single phase 208 or 240 power, the output for the machine is limited to 350
amps. This limited output could cause the machine to foldback to 350 amps when welding at higher settings or
thicker materials. When the foldback occurs, the weld parameters will turn RED indicating that the machine has
folded back to 350 amps. Reducing the weld settings or changing the input power to single phase 460/575 volts or
any three phase input power will correct the issue.
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