Lincoln Electric IM481-B manual Troubleshooting Guide, Trouble Cause What To Do

Page 23

TROUBLESHOOTING GUIDE

Trouble

 

Cause

 

What To Do

 

 

 

 

 

Input contactor (CR1 chatters).

1.

Faulty input contactor (CR1).

1.

Repair or replace.

 

2.

Low line voltage.

2.

Check input power.

 

 

 

 

Machine input contactor does not

1. Supply line fuse blown.

1.

Replace if blown - look for reason

operate.

 

 

 

first.

 

2.

Contactor power circuit dead.

2.

Check control transformer T2

 

 

 

 

and associated leads.

 

3.

Broken power lead.

3.

Check input voltage at contactor.

 

4.

Wrong input voltage.

4.

Check voltage against instruc-

 

 

 

 

tions.

 

5.

Open input contactor coil.

5.

Replace coil.

 

6.

POWER “I/O” switch (S1) not

6.

Replace switch.

 

 

closing.

 

 

 

 

 

 

 

Machine input contactor operates,

1.

Circuit between #2 (C ) and #4

1.

Make sure trigger circuit is being

but no output when trying to weld.

 

(D) is not being closed.

 

closed.

 

2.

Electrode or work lead loose or

2.

Repair connection.

 

 

broken.

 

 

 

3.

Open main transformer (T1) pri-

3.

Repair

 

 

mary or secondary circuit.

 

 

 

4.

Defective Control PC Board.

4.

Replace. See Procedure for

 

 

 

 

Replacing PC Boards.

 

5.

Primary or secondary ther-

5.

Amber thermal protection light is

 

 

mostats open.

 

on: Check for overheating; make

 

 

 

 

sure fan is operating and there is

 

 

 

 

no obstruction to free air flow.

 

 

 

 

Machine has minimum output and

1. Terminals 75, 76, or 77 grounded

1.

Check 75, 76, or 77 for ground to

no control.

 

to positive output.

 

positive output circuit. Nearly

 

 

 

 

zero ohms to ground indicates a

 

 

 

 

grounded circuit. A value greater

 

 

 

 

than a few thousand ohms is nor-

 

 

 

 

mal. Self-restoring fuses on PC

 

 

 

 

Board automatically reset within

 

 

 

 

a few seconds after ground is

 

 

 

 

cleared.

 

 

 

 

Machine has high output and no

1. Terminals 75, 76, or 77 grounded

1.

Check 75, 76, or 77 for ground to

control.

 

to negative output.

 

negative output circuit. Nearly

 

 

 

 

zero ohms to ground indicates a

 

 

 

 

grounded circuit. A value greater

 

 

 

 

than a few thousand ohms is nor-

 

 

 

 

mal. Self-restoring fuses on PC

 

 

 

 

Board automatically reset within

 

 

 

 

a few seconds after ground is

 

 

 

 

cleared.

 

 

 

 

 

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Contents IM481-B Safety Depends on YouSafety Electric Shock can kill Iii Welding and Cutting Sparks can Cause fire or explosionSûreté Pour Soudage a L’Arc Précautions DE SûretéPlease Examine Carton and Equipment For Damage Immediately Table of Contents Output Control Dial Meanings of Graphic SymbolsPower ON-OFF Switch Output Control LOCAL-REMOTE SwitchThermal Protection Light Voltmeter SwitchCircuit Breaker Degree of protection provided by the enclosure Rating PlateSignifying the Chassis Ground Connection Earth Ground ConnectionSignifying the Earth Ground Connection Chassis Ground ConnectionDesign Summary Operational Features & ControlsGeneral Machine Description Recommended Processes & EquipmentCase Features Auxiliary Power ConnectionsRemote Control Connections WATER COOLER CONNECTORMETER OPTION Machine & Circuit Protection Thermal Protection LightParalleling Technical Specifications FALLING EQUIPMENT can cause InstallationSafety Precautions Input Power ConnectionsElectric Shock can kill Installation of Field Installed OptionsOutput Cable Connections Output CablesConnection of CV 500-I to LN-22 or LN-25 Wire Feeder Control Cable ConnectionsUndercarriages K817P, K841 Duty Cycle Amps Volts Power Source OperationSafety Precautions ELECTRIC SHOCK can kill Operating InstructionsTerminal Strip Connections Front View of 14-PIN Connector ReceptaclePIN LEAD NO Function Machine and Circuit Protection VAC Auxiliary Power for Water CoolerRoutine Maintenance HOW to USE Troubleshooting Guide TroubleshootingTrouble Cause What To Do TROUBLESHOOTING GUIDEFaulty Output Control potentiometer Trouble Cause What To Do Output Voltage Connecting the Remote Control to the MachineFault Protection Operation Power I/O Switch CheckPower Silicon Controlled Rectifier Test Remote Control CheckPower Rectifier Bridge Assembly Checking Procedure Power Diode TestRubber Boot To plug To T1 main transformer Gate leads plug to Control P.C. boardEnhanced Diagram Page Page Precaucion Warnung
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