General
OM-244 814 Page 47
Trouble RemedyProbable Cause
Wandering, hunting or erratic arc
(Continued)
Voltage sensing leads open or shorted Repair or replace voltage sense leads
High frequency noise in the area Be sure proper grounding methods are followed
when TIG or plasma equipment is used in the area
Arc blow see Section 9-8
Drive motor tachometer or motor cable open or
shorted
Check drive motor tachometer and cables, and re-
pair or replace
Wrong size drive rolls Replace with proper size drive rolls
Too much or too little drive roll pressure Adjust drive roll pressure
Welding wire burns back to contact tip at
the start of a weld
Restriction in wire feed system Check inlet cable, gun liner and wire guides
Worn drive rolls Replace drive rolls
Wrong size drive rolls Replace with proper size drive rolls
Improper start parameters Adjust start parameters
Worn contact tip Replace contact tip
Wrong size or type of contact tip Replace with proper size and type contact tip
Not enough cast in welding wire Add a wire straightener to put cast in wire
Welding wire burns back to contact tip
during welding
Restriction in wire feed system Check inlet cable, gun liner and wire guides
Worn drive rolls Replace drive rolls
Wrong size drive rolls Replace with proper size drive rolls
Too much or too little drive roll pressure Adjust drive roll pressure
Worn contact tip Replace contact tip
Wrong size or type of contact tip Replace with proper size and type contact tip
Not enough cast in welding wire Add a wire straightener to put cast in wire
Welding wire burns back to contact tip at
the end of a weld
Welding power source output not shutting off Make sure all switches are in correct position, re-
pair power source if necessary
Burnback setting too high or too long Adjust burnback setting or turn off completely
Shutdown at arc initiation using power
source and feeder or interface
No voltage feedback signal Broken or disconnected voltage feedback lead, no
open circuit voltage, check power source
No current feedback signal Poor parameters, open in weld circuit, faulty hall
device, check power source
No tachometer sensing No wire speed command from robot, material
jammed in drive gears, faulty tachometer in drive
motor, wire feed drive circuit board, or motor cable,
check wire feed system
Poor parameters preventing arc stability Check for proper pulse program, material, welding
wire, shielding gas, voltage setting, and wire speed
setting
Arc start error Check contact tip, wire feed system and weld cir-
cuit
No start signal from robot Check robot setup and interconnect cable connec-
tion between robot controller and interface
No wire feed with wire feed motor running Wire stuck in contact tip, worn or wrong size drive
rolls, improper drive roll pressure setting, or wire
not unspooling or restriction in drum adapter, check
wire feed system
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