Hobart Welding Products TM-944C manual Routine Maintenance, Months

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SECTION 7 − MAINTENANCE

7-1. Routine Maintenance

Y Disconnect power before maintaining.

3 Months

Replace unreadable labels.

Repair or replace cracked weld cable.

Clean and tighten weld terminals.

6 Months

Blow out or vacuum inside.

During heavyOr service, clean

monthly.

7-2. Overload Protection

1

7-3. Drive Motor Protection

1 Circuit Breaker CB1

CB1 protects unit from overload. If CB1 opens, unit shuts down.

Reset breaker.

802 441

Drive motor protection circuit protects drive motor from overload. If drive motor becomes inoperative, release gun trigger and wait until protection circuit resets allowing drive motor to feed wire again.

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Contents Description TM-944CProcesses Table of Contents Servicing Hazards − Safety Precautions for ServicingSymbol Usage California Proposition 65 Warnings EMF InformationRadiation can cause interference Overuse can cause OverheatingVAC Model − SpecificationsSpecifications Duty Cycle And Overheating OutputDuty Cycle % Output AmperesVolt-Ampere Curves − Installation Installing Welding Gun Installing Work ClampElectrode Negative For Flux Core Wire For Solid WireProcess/Polarity Table Changing PolarityInstalling Gas Supply Rating Label Grounded ReceptacleVolt, 20 ampere individual Up to 200 ft 61 mDo not move or operate unit where it could tip 18 in 457 mm of space for airflow= GND/PE L2 L1 230 VACElectrical Service Guide For 230 VAC Model Installing Wire Spool And Adjusting Hub Tension230 Reference 1996 National Electrical Code NECThreading Welding Wire Pressure Indicator ScaleBe sure that tip matches wire diameter Reinstall contact tip and nozzleVoltage Switch Power Switch− Operation ControlsWeld Parameter Chart For 115 VAC Model Starting Value only − Wire Speed Setting Can be Wire Speed Also Depends on Other variables Such Stick OutElectrode Positive For Solid Wire WhileWeld Parameter Chart For 230 VAC Model Listed Starting Value Only − Wire Speed Setting can be Metal Etc− Theory of Operation Block Wire Drive Motor Stablizer L1Main Polarity− Troubleshooting Troubleshooting TableGS1 if necessary Clear blockage in gunV8/R5 V9/R6 V10 V11/R9 TM-944030/.035 Solid 585Or Flux Core 640Test Equipment Needed Handler 135700 510600 Control Board PC1 Testing Information 115 VAC Model Control Board PC1 Test Point Values 115 VAC Model Circuit commonControl Board PC1 Testing Information 230 VAC Model Control Board PC1 Test Point Values 230 VAC Model − Maintenance Routine MaintenanceDisconnect power before maintaining Overload Protection Drive Motor ProtectionReplacing Gun Contact Tip Changing Drive Roll Or Wire Inlet GuideTurn Off power before replacing contact tip To Reassemble Gun Cleaning Or Replacing Gun LinerDisconnect gun from unit Replacing Switch And/Or Head Tube − Electrical Diagrams Model Serial Or Style Number Circuit Diagram Wiring Diagram194 324-C 194 325-A 196 637-A 196 655-A 195 890-A 195 891-A Handler 135 H-10 Gun − Parts List 11 10Dia Part Mkgs Description Quantity Optional 195 Optional Drive RollsOptions Hobart Welding Products