Main Transformer Test | Lincoln Electric SVM 117-A manual

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F-12

TROUBLESHOOTING & REPAIR

F-12

MAIN TRANSFORMER TEST (CONTINUED)

4. Locate the following leads on Plug

a.

Turn the machine OFF between

J3:

each test.

G2332:

b.

Carefully

insert the

meter

LEAD

PLUG

probes

into

the

back

of each

LOCATION

Molex Plug pin cavity to perform

#202

1J3

the test.

G2332:

#203

3J3

#204 A

2J3

FROM

TO

EXPECTED

LEAD

LEAD

VOLTAGE

5. Connect main input power to the

machine.

#208

#209

60 VAC

6. Turn the Wire-Matic 250 ON/OFF

(16J6)

(7J6)

POWER SWITCH to ON.

#208

#206

30 VAC

7. Make the following voltage tests at

(16J6)

(4J6)

Plug J3.

#209

#206

30 VAC

a. Turn the machine OFF between

(7J6)

(4J6)

each test.

c. If any of the voltages tested are

b. Carefully insert the meter

incorrect, check for loose or bro-

probes

into the back of each

ken leads between the test

Molex Plug pin cavity to perform

points and the main transformer.

the test.

G2332:

d.

If ALL the voltages tested are

incorrect or missing, go to Step

FROM

TO

EXPECTED

12.

LEAD

LEAD

VOLTAGE

12. Test for correct nameplate input volt-

#202

#203

30 VAC

age between the H1 lead at the

(1J3)

(3J3)

ON/OFF POWER SWITCH to H2 or

#202

#204 A

15 VAC

H3 (H5 if connected for 575 VAC) at

the reconnect panel. Voltage tested

(1J3)

(2J3)

will vary depending on Input Voltage

#203

#204 A

15 VAC

Connection. See wiring diagram for

test point locations.

(3J3)

(2J3)

a.

If the voltage test is incorrect,

8. Turn OFF the machine

9. Locate the following leads on Plug

-

check for loose

or

broken

J6 on the G2332 Control PC Board.

leads between

the

reconnect

G2332:

panel and the ON/OFF POWER

SWITCH.

LEAD

PLUG

LOCATION

- test the ON/OFF POWER

#206

4J6

SWITCH for proper operation.

#208

16J6

b. If the correct nameplate voltage

#209

7J6

is being applied to the main

10. Turn ON the machine.

transformer and one or more of

11. Make the following voltage tests at

the

secondary

voltages

are

missing

or

are

incorrect,

the

	Plug J6 on the G2332 Control PC	main transformer may be faulty.
	Board.	main transformer may be faulty.
	Board.	Replace.
		Replace.
	WIRE-MATIC 250

Image 65

Lincoln Electric SVM 117-A service manual Main Transformer Test

Contents

Safety Depends on You WIRE-MATIC ARC Welding can be hazardous Safety Cylinder may explode if damaged Iii Electric and MAG- Netic Fields Sûreté Pour Soudage a L’Arc Précautions DE Sûreté WIRE-MATIC Table of Contents Table of Contents Installation Current Range Duty Cycle Amps Volts at Rated AmpsFuse Superlag Type 750C Copper Select Proper Location Safety PrecautionsInput Connections Stacking Input Power Connections and Ground Connections Fuse and Wire Sizes Connect Shielding GAS Figure A.4 Input Air Supply Connections Reconnect Procedure Figure A.5 Reconnect Diagram For 208/230/1/60 Machines Install the Work Clamp InstallationConnect Output Components GUN Liner and Contact Output Polarity Connection GUN and Cable Installation Wire Size Conversion Parts WIRE-MATIC Operation WELDING, Cutting Safety InstructionsGeneral Description Unit Features Design Features AdvantagesPower Source Features Recommended Processes and Equipment Machine Capability Wire Feeder FeaturesLimitations Duty Cycle Amps Volts Figure B.1 Operator Controls Controls and Settings Loading the Wire Reel Using the Wire Drive RollProcedure for Changing Drive Roll To mount 10 to 30 lb. spools 8 and 12 diameter Proper Wire FeedingFeeding Electrode Starting the Welder Setting Idle Roll PressureOperating Steps Making a Weld WIRE-MATIC Accessories K607-1 Spool GUN Adapter KIT OPTIONS/ACCESSORIESInstalling the K607-1 Spool GUN Adapter KIT Spool GUN Module Board Installation Return Return to Section TOC Spool GUN Connection BOX Installation Spool GUN Preparation Spool GUN Connection Making the Weld Making a Weld with the Spool GUN Adapter K607-1 Installed Timer KIT K585-1 Aluminum Wire Sizes Steel Wire Sizes Part NumberDrive Roll Kits To Make Spot Plug Welds Maintenance Perform the following daily Routine and Periodic Maintenance Maintenance Cable Cleaning Contact TIP and GAS Nozzle InstallationDrive Rolls and Guide Tubes GUN Tubes and Nozzles DROP-IN Reel Spindle and Clips Figure D.2 Liner maintenance Liner Removal Replacement To open up the handle GUN Handle Disassembly Description English Size Metric Size WIRE-MATIC Theory of Operation Transformer Input Line Voltage and Main Feedback Control Output Rectification Figure E.4 Constant Voltage Output Constant Voltage Output Feedback Wire Drive Motor Thermal Protection Figure E.6 SCR Operation SCR Operation WIRE-MATIC Troubleshooting & Repair Recommended Course of Action HOW to USE Troubleshooting Guide Board can be dam- aged by static electricity PC Board Troubleshooting ProceduresElectric Shock can kill Main Transformer Rectifier Assembly Test To Section TOC Perform the SCR Rectifier Perform the Wire Drive Motor Trolyte in these capacitors is Liquid elec Perform the Output Rectifier Materials Needed Main Transformer TestTest Description ON/OFF Power Switch will be hot during these tests Main Transformer Test Test Procedure Main Transformer Test Static SCR Rectifier Assembly Test Leads Figure F.4 SCR 1 Test Points Active SCR Rectifier Assembly Test Leads SCR connections Figure F.7 SCR Tester Circuit Wire Drive Motor and Tachometer Feedback Test Wire Drive Motor and Tachometer Feedback Test Test Procedure Test for Feedback Voltage to the Control Board Test for Supply Voltage to Tachometer Normal Open Circuit Voltage Waveform Scope Settings Typical Output Voltage Waveform Machine Loaded Machine Loaded to 250 Amps AT 26 VDC Scope Settings Machine Loaded to 220 Amps AT 22 VDC Scope Settings Troubleshooting & Repair Typical SCR Gate Voltage Waveform Materials Needed Control PC Board Removal and ReplacementRemoval and Replacement Procedure Removal and REPLACE- Ment Procedure Wire Drive Assembly Removal and Replacement Figure F.11 Wire Drive Assembly Removal Wire Drive Assembly Removal and Replacement Procedure SCR Output Rectifier Removal & Replacement Disconnection Heat Sink Lead Right side heat sink See Figure F.14 Capacitor Bank Removal and Replacement Components Bank Removal Replacement Main Transformer Removal and Replacement Power Switch FAN Motor and FAN Removal and Replacement Figure F.16 Fan Motor and Fan Removal Components FAN Motor and FAN Removal and Replacement Procedure Troubleshooting & Repair Open Circuit Voltage Wire Speed RangeInput Volts/Hertz 230/60 375 WIRE-MATIC Table of Contents Electrical Diagrams Section WIRE-MATIC Electrical Diagrams Spool GUN Option Wiring Diagram 208/230 Code To Section Available from Lincoln Control PC Board G2332 Layout