Manuals / Lincoln Electric / Power Tools / Welding System

Lincoln Electric SP-250 Wire Drive Motor and Tachometer Feedback Test Test Procedure

Models: SP-250

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F-29	TROUBLESHOOTING & REPAIR	F-29
	TROUBLESHOOTING & REPAIR

WIRE DRIVE MOTOR AND TACHOMETER FEEDBACK TEST

TEST PROCEDURE

NOTE: POLARITY MUST BE

OBSERVED FOR THESE TESTS.

Test for Correct Wire Drive Motor

Armature Voltage

1.Disconnect main input power to the machine.

2.Remove the Case Top and Side Panels using a 5/16" nut driver.

3.Locate Plug J5 on the G2252 Control Board, or Plug J6 on the G1992 Control Board (Code 9402 only).. See Figures F.10A and F.10B.

		SP-250 CONTROL
			G2252
	J2
			J8
		J7
		J4
	J5	J9	J3
#515B
(3J5)
#206B
(2J5)		J6
#555	#539	#541
(1J5)	(8J5)	(9J5)

FIGURE F.10A - Plug J5 Location on

G2252 PC Control Board.

IDEALARC SP-250

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Lincoln Electric SP-250 service manual Wire Drive Motor and Tachometer Feedback Test Test Procedure

Contents

Safety Depends on You Idealarc SP-250 ARC Welding can be hazardous Idealarc SP-250 Cylinder may explode if damaged Electric and MAG- Netic Fields Iii Précautions DE Sûreté Sûreté Pour Soudage a L’Arc Table of Contents Installation Height Depth Weight GUNStorage Operating Safety Precautions Select Proper LocationInput Connections Stacking Fuse and Wire Sizes Input Power Connections Ground Connections Connect Shielding GAS Figure A.3 Ground Connection For 230/460/575 Volt Models Reconnect Procedure Side Return to Section TOC GUN Liner & Contact TIP Installation Install the Work ClampConnect Output Components Output Polarity Connection GUN & Cable Installation Figure A.9 European Style Connector Operation Safety Instructions Additional Safety PrecautionsGeneral Description Electric Shock can kill System includes the following features OperationalControls Recommended Processes Design Features Unit FeaturesWire Feeder Features Power Source Features Limitations Machine CapabilityDuty Amps Volts Cycle Controls and Settings Figure B.1 SP-250 Control Panel Keys Arrow KEY Operation When Used with Process WIRE/GAS KEY Arrow KEY Operation When Used with Auto KEY Arrow KEY Operation When Used with Manual KEY Arrow KEY Operation When Used with Spot KEY Arrow KEY Operation When Used with Stitch KEYLeft arrow keys Do not function Right arrow keys Do not function Figure B.5 Using the Toggle Function Step Trigger Interlock Keys RUN-IN Mode Changing RUN-IN Mode Codes 10001 and AboveMaking a Weld in Auto Mode Operating Steps Making a Spot Weld in Auto Mode Using the 4-STEP Interlock Function in Auto ModeTo make an arc spot plug weld Using the GUN Thumb Switch Magnum SP-250 only Using the Wire Drive RollMaking a Stitch Weld in Auto Mode Using the GUN Trigger Switch Loading the Wire Reel To mount 10 to 30 lb. spools 8 and 12 diameter Setting Idle Roll Pressure Feeding Electrode Accessories Spool GUN Adapter KIT Installation Options / AccessoriesSpool GUN Module Board Installation Figure C.2 Spool Gun Module Board Installation Installation Spool GUN Connection BOX Spool GUN Connection Figure C.5 Spool Gun Connect Spool GUN Installation to OLD K531 KIT Figure C.6 Spool Gun Connection Maintenance Maintenance Routine and Periodic Control Board Choke Fan Assembly Main Transformer Theory of Operation Input Line Voltage and Main Trans Power Supply OperationFormer Output Rectification and Feed Back Control Constant Voltage Output Figure E.4 Constant Voltage Output Wire Drive Motor and Feedback Figure E.5 Wire Drive Motor and Feedback Thermal Protection SCR Operation Figure E.6 SCR Operation Troubleshooting & Repair HOW to USE Troubleshooting Guide Recommended Course of Action PC Board Troubleshooting Procedures Board can be dam- aged by static electricity Output Problems Warn Troubleshooting & Repair Function Problems Troubleshooting & Repair Wire Feeding Problems Liquid elec Trolyte in these capacitors isToxic. Avoid contact with any Portion of your body Troubleshooting & Repair Explanation of Prompting and Error Messages On Screen Error Message Message Explanation On Screen Error Message Explanation of Prompting and Error Messages CONT’DXxxx Current Overload Reduce Output Press ANY KEY to Stop Message Test Description Main Transformer TestMaterials Needed Main Transformer Test Test Procedure Lead Plug Location From Expected Lead Voltage #206 4J6 #208 16J6 #209 7J6 G1992 Code 9402 only Troubleshooting & Repair Static SCR Rectifier Assembly Test Leads Figure F.4 SCR 1 Test Points Active SCR Rectifier Assembly Test Leads Figure F.7 SCR Tester Circuit and SCR connections SP-250 Keypad Resistance Test 25F-25 Figure F.8A Plug J2 Location on G2252 PC Control Board Figure F.9 Plug J2 Test Points 27F-27 Test Points KEY Pressed Maximum AllowableTable F.1 SP-250 Keypad Resistance Tests Wire Drive Motor and Tachometer Feedback Test Wire Drive Motor and Tachometer Feedback Test Test Procedure Figure F.10A Plug J5 Location on G2252 PC Control Board #206B 4J6 #515B 1J6 #555 2J6 #541 6J6 #539 3J6 Pull the gun trigger Test for Supply Voltage to Tachometer Test for Feedback Voltage to the Control Board Scope Settings Normal Open Circuit Voltage Waveform Machine Loaded to 250 Amps AT 26 VDC Scope Settings Typical Output Voltage Waveform Machine Loaded Machine Loaded to 220 Amps AT 22 VDC Scope Settings Troubleshooting & Repair Typical SCR Gate Voltage Waveform Control PC Board Removal and Replacement Removal and Replacement Procedure Materials Needed Troubleshooting & Repair Keypad Removal and Replacement Keypad Removal and Replacement Procedure Wire Drive Assembly Removal and Replacement Wire Drive Assembly Removal and Replacement Procedure Figure F.13 Wire Drive Assembly Removal SCR Output Rectifier Removal 43F-43 Figure F.14 Heat Sink lead discon- nection Capacitor Bank Removal and Replacement Capacitor Bank Removal and Replacement Procedure Main Transformer Removal and Replacement Power Switch FAN Motor and FAN Removal and Replacement FAN Motor and FAN Removal and Replacement Procedure Figure F.18 Fan Motor and Fan Removal Components Troubleshooting & Repair Wire Speed Range Open Circuit VoltageInput Volts/Hertz 230/60 375 Table of Contents Electrical Diagrams G1992 Control PC Board Identification X9 . . . . . .IC-CMOS,UNDERVOLT-SENSING,RESET,MCU Idealarc SP-250 Electrical Diagrams G2252 Control PC Board TOC OCI2,OCI3 Optocoupler Triac Driver Idealarc SP-250 Electrical Diagrams Wiring Diagram for Code 9546 SP-250 230/460/575V Wiring Diagram Wiring Diagram for Code 9723 Thumb Switch Improper Lincoln Electric. 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