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Hobart Welding Products TM-944C Process/Polarity Table, Changing Polarity, Electrode Positive

Models: TM-944C

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3-3. Process/Polarity Table

Process	Polarity	Cable Connections
Process	Polarity
		Cable To Gun	Cable To Work

GMAW − Solid wire with shield-	DCEP − Reverse polarity	Connect to positive (+) out-	Connect to negative (−) output
ing gas		put terminal	terminal

FCAW − Self-shielding wire −	DCEN − Straight Polarity	Connect to negative (−)	Connect to positive (+) output
no shielding gas		output terminal	terminal

3-4. Changing Polarity

CHANGING
POLARITY
DCEN
Electrode	Negative
For Flux	Core Wire
1
DCEP
Electrode Positive
For Solid Wire

1Lead Connections For Direct Current Electrode Negative (DCEN)

2Lead Connections For Direct Current Electrode Positive (DCEP)

Always read and follow wire manufacturer’s recommended po- larity, and see Section 3-3.

Close door.

2

Ref. 209 228 / Ref. 209 229

Handler 135 / 175

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Hobart Welding Products TM-944C manual Process/Polarity Table, Changing Polarity, Electrode Negative For Flux Core Wire

Contents

TM-944C ProcessesDescription Table of Contents − Safety Precautions for Servicing Symbol UsageServicing Hazards EMF Information California Proposition 65 WarningsRadiation can cause interference Overuse can cause Overheating− Specifications SpecificationsVAC Model Output Duty Cycle And OverheatingDuty Cycle % Output AmperesVolt-Ampere Curves Installing Welding Gun Installing Work Clamp − InstallationFor Solid Wire Electrode Negative For Flux Core WireProcess/Polarity Table Changing PolarityInstalling Gas Supply Grounded Receptacle Rating LabelVolt, 20 ampere individual Up to 200 ft 61 m18 in 457 mm of space for airflow Do not move or operate unit where it could tip= GND/PE L2 L1 230 VACInstalling Wire Spool And Adjusting Hub Tension Electrical Service Guide For 230 VAC Model230 Reference 1996 National Electrical Code NECPressure Indicator Scale Threading Welding WireBe sure that tip matches wire diameter Reinstall contact tip and nozzlePower Switch Voltage Switch− Operation ControlsWeld Parameter Chart For 115 VAC Model Wire Speed Also Depends on Other variables Such Stick Out Starting Value only − Wire Speed Setting Can beElectrode Positive For Solid Wire WhileWeld Parameter Chart For 230 VAC Model Metal Etc Listed Starting Value Only − Wire Speed Setting can be− Theory of Operation Stablizer L1 Block Wire Drive MotorMain PolarityTroubleshooting Table − TroubleshootingClear blockage in gun GS1 if necessaryTM-944 V8/R5 V9/R6 V10 V11/R9585 030/.035 SolidOr Flux Core 640Handler 135 Test Equipment Needed510 600700 Control Board PC1 Testing Information 115 VAC Model Circuit common Control Board PC1 Test Point Values 115 VAC ModelControl Board PC1 Testing Information 230 VAC Model Control Board PC1 Test Point Values 230 VAC Model Routine Maintenance − MaintenanceDisconnect power before maintaining Overload Protection Drive Motor ProtectionChanging Drive Roll Or Wire Inlet Guide Turn Off power before replacing contact tipReplacing Gun Contact Tip Cleaning Or Replacing Gun Liner Disconnect gun from unitTo Reassemble Gun Replacing Switch And/Or Head Tube Model Serial Or Style Number Circuit Diagram Wiring Diagram − Electrical Diagrams194 324-C 194 325-A 196 637-A 196 655-A 195 890-A 195 891-A Handler 135 H-10 Gun 11 10 − Parts ListDia Part Mkgs Description Quantity Optional Optional Drive Rolls Options195 Hobart Welding Products