Lincoln Electric 7FH manual Problems, Communications in control cable

PROBLEMS

PROBLEM	POSSIBLE CAUSE	WHAT TO DO
1. Rough wire feeding or wire not	a. Gun cable kinked and/or twisted.	a. Inspect gun cable and replace if
feeding but drive rolls turning.		necessary.
	b. Wire jammed in gun and cable.	b. Remove wire from gun and cable
		feed in new wire. Note any
		obstructions in gun and cable.
		Replace gun and cable if
		necessary.
	c. Incorrect position of drive rolls	c. See Wire Feed Drive Roll and
	with grooves.	Guide Tubs Kits section for
		proper installation of drive roll.
	d. Drive rolls loose.	d. Remove, clean, install and
		tighten.
	e. Gun cable dirty.	e. Clean cable or replace liner.
	f. Worn drive roll.	f. Replace.
	g. Electrode rusty and/or dirty.	g. Replace.
	h. Worn nozzle or cable liner.	h. Replace.
	i. Partially flashed or melted	i. Replace contact tip.
	contact tip.
	j. Incorrect idle roll pressure.	j. Set idle roll pressure per section
		on Idle Roll Pressure Setting.
	k. Improper liner, tip or guide tube.	k. Install proper equipment.
2. Variable or “hunting” arc.	a. Wrong size, worn and/or melted	a. Replace tip - remove any spatter
	contact tip.	on end of tip.
	b. Worn work cable or poor work	b. Inspect - Repair or replace as
	connection.	necessary.
	c. Loose electrode connections.	c. Be sure electrode lead is tight in
		wire feeder contact block, gun
		nozzle and gun tip tight.
	d. Wrong polarity.	d. Check connection at output studs
		for polarity required by welding
		process.
	e. Problem with serial	e. Make sure control cable connections are
	communications in control cable.	tight. Check for consistent WFS. Make sure
		parameters on Power Source display, such
		as WFS, match those on wire feeder
		display, if not, try changing Synergic 7F
		control board. If problem persists refer to
		Power Source trouble shooting information.

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