Lincoln Electric IM887 manual Motor Check, Testing the Potentiometer, Testing the Trigger Switch

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		MAGNUM 250 LX
Troubleshooting Guide
TESTING THE TORCH

Motor Check.		Remove the torch connector from the cabinet.
		Using the torch Control Cable Connector, check the resistance across pins “A”
		and “B” (motor leads). The resistance across the motor should be between 5-10
		ohms. If an open circuit or short exist, check the motor leads and motor
		independently.

Testing the Potentiometer.		Using the torch Control Cable Connector, check the resistance across pin “D”
		(wiper) and pin “C”. The resistance should vary from 5K - 0 ohms.
		Check the resistance across pin “D” (wiper) and pin “G”. The resistance should
		vary from 5K - 0 ohms.

Testing the Trigger Switch.		Using the torch Control Cable Connector, check for continuity across pins “E”
		and “F” when the trigger is pressed.

E

F

D

G

A

C

B

"W" CLOCKED CONNECTOR

(VIEWED FROM FRONT OF CONNECTOR)

				TORCH
		RED	FUNCTIONS
	A	RED	+	-	TORCH
	B	BLACK		5K 3	MOTOR
	B	WHITE	1		CW
	G	WHITE	1		CW
	G	GREEN		2	TORCH
					TORCH
	D				POT
	D	BLUE			POT
	C	BLUE
	C
	E	BROWN			TORCH
					TORCH
		YELLOW/ORANGE			TRIGGER
	F	YELLOW/ORANGE			TRIGGER
	F

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Contents K2490-1 Magnum 250 LX Spool GUNSafety Fumes and Gases can be dangerous Electric Shock can killARC Rays can burn Welding Sparks can cause fire or explosion Cylinder may explode if damagedSûreté Pour Soudage a L’Arc Précautions DE SûretéOn-Line Product Registration Please Examine Carton and Equipment For Damage ImmediatelyTable of Contents Magnum 250 LX General Information Remote Wire Speed ControlModel Supplied withSafety Precautions Magnum 250 LX InstallationUnpacking the Spool Gun Unpacking the Spool GunSpool Gun Familiarization Power source must be off and power cord disconnectedReconnect power and turn on machine Loading Electrode Wire Selecting Electrode WireMagnum 250 LX Operating Instructions Keep flammable material awayCorrect Drive Roll Groove Selection Making a Weld Maintenance Magnum 250 LX ACCESSORIES/MAINTENANCE AccessoriesMagnum 250 LX Troubleshooting GuideMotor Check Testing the PotentiometerTesting the Trigger Switch Fuera del área de trabajo Cuerpo GroundInflammable Votre corps PerschutzGuards off Keep your head out of fumesUse ventilation or exhaust to Desconectar el cable de ali No operar con panel abierto o