Lincoln Electric IM958 manual Machine Grounding and High FRE, Quency Interference Protection

A-2			INSTALLATION			A-2
Read entire installation section before starting				MACHINE GROUNDING AND HIGH FRE-
installation.				QUENCY INTERFERENCE PROTECTION
Safety Precautions				The Capacitor Discharge Circuit used in the high fre-
				quency generator, may cause many radio, TV and
			WARNING
				electronic equipment interference problems. These
				problems may be the result of radiated interference.
			ELECTRIC SHOCK can kill.
			• Only qualified personnel should per-	Proper grounding methods can reduce or eliminate
			form this installation.	radiated interference.
			• Turn the input power OFF and	The Invertec V310-T AC/DC TIG has been field tested
			unplug the machine from the recep-	under recommended installation conditions. It com-
			tacle before working on this equip-	plies with FCC allowable limits for radiation.
			ment. Allow machine to sit for 5 min-	Radiated interference can develop in the following
			utes minimum to allow the power
			capacitors to discharge before	four ways:
•			working inside this equipment.	1.	Direct interference radiated from the welder.
	Insulate yourself from the work and ground.
• Always connect the V310-T to a power supply				2.	Direct interference radiated from the welding leads.
•		wear dry insulating gloves.		3.	Direct interference radiated from feedback into the
	grounded according to the National Electrical
------------------------------------------------------------				4.	power lines.
					Interference from re-radiation of “pickup” by
SELECT SUITABLE LOCATION					ungrounded metallic objects.
The Invertec will operate in harsh environments. Even				Keeping these contributing factors in mind, installing
so, it is important that simple preventative measures				equipment per the following instructions should mini-
are followed in order to assure long life and reliable				mize problems.
operation.
• The machine must be located where there is free cir-				1. Keep the welder power supply lines as short as
					possible and enclose as much of them as possible
	culation of clean air such that air movement in the				in rigid metallic conduit or equivalent shielding for a
	back and out the front will not be restricted.				distance of 50 feet (15.2m). There should be good
• Dirt and dust that can be drawn into the machine					electrical contact between this conduit and the
	should be kept to a minimum. Failure to observe				welder case ground. Both ends of the conduit
	these precautions can result in excessive operating				should be connected to a driven ground and the
	temperatures and nuisance shutdown.				entire length should be continuous.
STACKING				2. Keep the work and electrode leads as short as
The Invertec V310-T AC/DC TIG can not be stacked.					possible and as close together as possible.
					Lengths should not exceed 25 ft (7.6m).
TILTING				3. Be sure the torch and work cable rubber cover-
Place the machine directly on a secure, level surface.					ings are free of cuts and cracks that allow high
The machine may topple over if this procedure is not					frequency leakage. Cables with high natural rub-
followed.					ber content, such as Lincoln Stable-Arc®better
ENVIRONMENTAL AREA					resist high frequency leakage than neoprene and
					other synthetic rubber insulated cables.
Keep the machine dry. Do not place it on wet ground				4. Keep the torch in good repair and all connections
or in puddles.					tight to reduce high frequency leakage.

V310-T AC/DC TIG