Hobart 750 manual Troubleshooting, Running slowly

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4-4. Troubleshooting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Trouble

 

Remedy

 

 

 

 

 

 

 

 

 

 

No pilot arc; difficulty in establishing an

Clean or replace worn consumables as necessary (see torch Owner’s Manual).

arc.

 

 

 

 

 

 

 

 

 

 

Check for damaged torch or torch cable (see torch Owner’s Manual).

 

 

 

 

 

 

 

 

Have Factory Authorized Service Agent check power switch S1, control relay CR1, CR5 and CR6, rectifi-

 

 

 

er SR1 (and SR2 for single-phase models), safety control board PC1, power control boards PC2 and

 

 

 

PC3, inductor L1, resistor R1, and check gas air system for leaks.

 

 

 

 

 

No cutting output; Power light off;

Place Power switch in On position.

Trouble lights off; Ready light off; fan mo-

 

 

tor FM does not run.

 

 

 

 

 

 

 

 

 

 

Place line disconnect device in On position (see Section 2-9).

 

 

 

 

 

 

 

 

Check line fuse(s) and replace if needed or reset circuit breakers (see Sections 2-7 and 2-9).

 

 

 

 

 

 

 

 

Have Factory Authorized Service Agent check power switch S1, transformer T1, and fan motor.

 

 

 

 

 

No cutting output; Power light on; Ready

Be sure work clamp is connected.

light on; Trouble lights off; fan motor FM

 

 

running.

 

 

 

 

 

 

 

 

 

 

Clean or replace worn consumables as necessary (see torch Owner’s Manual).

 

 

 

 

 

 

 

 

Have Factory Authorized Service Agent check safety control board PC1, power control boards PC2 and

 

 

 

PC3, and rectifier SR1 (and SR2 for single-phase models).

 

 

 

 

 

No cutting output; Power light on; Ready

Check position of input voltage jumper links (see Section 2-8).

light on; Trouble lights off; fan motor FM

 

 

running slowly.

 

 

 

 

 

 

 

 

 

 

Check input power, and check for proper input connections (see Sections 2-7 and 2-9).

 

 

 

 

 

No control of output.

Have Factory Authorized Service Agent check safety control board PC1 and power control boards PC2

 

 

 

and PC3.

 

 

 

 

 

No gas/air flow; Power light on; Ready

Have Factory Authorized Service Agent check for proper torch connections, and check safety control

light on; Trouble lights off; fan motor FM

board PC1. Check operation of gas valve GS1, and check gas/air system for leaks.

running.

 

 

 

 

 

 

 

Pressure Trouble light On; Ready light

Check for correct gas/air pressure adjustment (see Section 3-2).

off.

 

 

 

 

 

 

 

 

 

 

Check for sufficient gas/air supply pressure (see Section 2-6).

 

 

 

 

 

 

 

 

Check for dirty air filter/regulator and clean, if needed (see manufacturer’s instructions).

 

 

 

 

 

 

 

 

Check air lines for leaks.

 

 

 

 

 

 

 

 

Have Factory Authorized Service Agent check pressure switch S3 and safety control board PC1.

 

 

 

 

 

Cup Trouble light On; Ready light off.

Check torch shield cup (see Section 4-3). Reset power switch.

 

 

 

 

 

 

 

 

Have Factory Authorized Service Agent check for proper torch connections, and check safety control

 

 

 

board PC1.

 

 

 

 

 

Temperature Trouble light On; Ready

Main transformer or main rectifier overheating. Allow fan to run; the Trouble light goes out when the unit

light off.

has cooled.

 

 

 

 

 

 

 

 

Have Factory Authorized Service Agent check safety control board PC1.

 

 

 

 

 

OM-279 Page 19

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Contents Description OM-279Processes From Hobart to You Table of Contents Page Cutting can cause fire or explosion Symbol UsageMarks a special safety message Plasma Arc Cutting HazardsNoise can damage hearing Exploding Parts can injureFlying Sparks can cause injury ARC Rays can burn eyes and skinOveruse can cause Overheating HOT Parts can cause severe burnsMoving Parts can cause injury Flying Metal can injure eyesAbout Pacemakers Principal Safety StandardsEMF Information Identifie un message de sé curité particulier Signification des symbolesLE Coupage pré sente un risque de feu ou d’explosion UNE DÉ Charge É Lectrique peut entraîner la mortLE Plasma D’ARC peut entraîner des blessures Risque de blessure en casLE Bruit peut endommager l’ouïe LES Fumé ES ET LES GAZ peuvent ê tre dangereuxDES Particules Volantes peuvent blesser les yeux LES Bouteilles peuvent exploser si elles sont endommagé esDES Pieces Chaudes peuvent pro- voquer des brû lures graves DES Organes Mobiles peuvent provoquer des blessuresConsignes relatives aux stimulateurs cardiaques Principales normes de sé curitéInformation sur les champs é lectromagné tiques Duty Cycle And Overheating InstallationSpecifications Dimensions And WeightMovement Location And Airflow Special installation may beCutting Speed Selecting a LocationElectrical Service Guide Connecting Gas/Air SupplyPlacing Jumper Links Grounding conductor first Connecting Input PowerThree-Phase System Always connectFront Panel Controls OperationSet pressure to 70 PSI 483 kPa Setting Gas/Air PressureTrigger is pressed Sequence Of OperationExample Of Cutting Operation Months Maintenance & TroubleshootingChecking Shield Cup Shutdown System Trouble LightsRunning slowly TroubleshootingFan motor FM does not run Power light Circuit Diagram For 200/230/460 Volt Models Electrical DiagramsCircuit Diagram For 230/460/575 Volt Models OM-279 Main Assembly Parts ListDia Part Mkgs Description Quantity Consumable Parts For ICE-50C Support ServiceHobart Welding Products Contact your Distributor for