Miller Electric 75 manual Operational Terms

SECTION 5 − OPERATION

5-1. Operational Terms

The following is a list of terms and their definitions as they apply to the interface unit in the wire feeder:

General Terms:
Arc Adjust	Term used to represent arc length adjustments in pulse programs. Increasing Arc Adjust increases
	the actual arc length. Likewise, decreasing arc adjust shortens arc length. Arc Adjust is replaced by
	volts in MIG programs.
Trigger Control	Selecting Trigger Control allows activating trigger functions such as DS, TH, 4T, TDS, and TPS.
DS (Dual Schedule)	Dual Schedule allows selecting a pair of programs that can be used together.
TH (Trigger Hold)	Trigger Hold allows the operator to feed wire without continuously pressing the gun trigger. In trigger
	hold mode, momentarily press gun trigger, and wire will feed until gun trigger is momentarily pressed
	again.
4T	4T allows the operator to select between weld parameters and crater parameters using the gun
	trigger. Crater time must be set for at least 0.2 seconds to make this function operational. If gun
	trigger is released during welding, unit goes into trigger hold, then pressing and holding trigger again
	causes unit to stay in crater until trigger is released and crater parameter times out.
TDS (Trigger Dual Schedule)	TDS allows the operator to select between a pair of weld programs by using the gun trigger. In TDS
	mode, momentarily pressing the gun trigger allows the operator to cycle between a pair of preselected
	weld programs.
TPS (Trigger Program Schedule)	TPS allows the operator to select weld programs by using the gun trigger. In TPS mode, momentarily
	pressing the gun trigger allows the operator to cycle through preselected weld programs up to a total
	of 8 programs.
Program	Eight active slots for selection of various processes, wire type, and parameters.
Process	A selection made for MIG, Pulse, Accu-pulse, and RMD (optional).
MIG	CV weld process with individual settings of voltage and wire speed.
Pulse	Conventional pulse program using peak, background, pulse width, frequency, and peak voltage as
	factory taught data. Adaptive method is controlled by frequency adjustment.
Accu-pulse	Pulse process utilizing constant current ramps with constant voltage control of peaks and
	backgrounds. Adaptive response is controlled by peak and minimum current levels. Benefits are
	shorter arc lengths, better puddle control, more tolerant of tip-to-work variation, less audible noise, no
	arc wandering, allows weld to fill in at toes increasing travel speed and deposition, and more tolerant
	to poor fit up and gaps.
RMD (optional)	RMD refers to Regulated Metal Deposition. A precisely controlled short-circuit transfer. Benefits of
	RMD are well suited to thin materials, improves gap filling and spatter reduction. Provides less heat
	input into workpiece, minimizes distortion and allows use of larger diameter wire on thin gauge
	materials.
Wire Type	Selection of wire type by alloys and classification.
Gas Type	Selection of shielding gas being used in application.
Process Set Up	Selection procedure for entering program.
Program Load	Enters selected program information into program slot.
Volts	Preset voltage in MIG mode at idle, actual voltage while welding, and 3 seconds hold value at end of
	weld.
Time	Indicates time values being set for timed functions (e.g. Preflow, Postflow which are only available in
	the Arc On and Analog input or the Arc On and No Analog input modes).
Arc Length	Distance from end of wire electrode to workpiece.
WFS	Term used to represent wire feed speed. In MIG mode, wire feed setting is independent of voltage
	setting. In pulse, Accu-pulse, and RMD (optional) adjusting wire feed speed also increases power
	level on wire electrode (one knob control).
Amps	Indicates average amperage while welding and 3 seconds hold value at end of weld.
Arc Control	Allows setting of inductance in MIG mode. In pulse and Accu-pulse mode, this adjustment changes
	the arc cone by adjusting the preprogrammed factory pulse data. In RMD (optional), this control will
	affect the in much the same way as inductance.
Inductance	In short circuit GMAW welding, an increase in inductance will decrease the number of short circuit
	transfers per second (provided no other changes are made) and increase the arc-on time. The
	increased arc-on time makes the welding puddle more fluid.
Adjust	Control knob used to change or set parameters and functions.
Sequence	Selecting Sequence will allow setting of preflow, start, crater, and postflow times and parameters.
Preflow	Setting a time value for gas flow prior to arc start.
Start	Provides voltage/arc adjust, wire feed rate, and time value for modified arc starts (which is only
	adjustable with the optional PDA with File Management/WaveWriter software).
OM-228 956 Page 18