Miller Electric CST 250 VRD manual Troubleshooting, Trouble Possible Causes Remedy

Page 28

5-3.

Troubleshooting

 

 

1

Output LED (Blue)

 

2

High Temperature LED

 

 

(Yellow)

 

1

 

 

2

 

 

 

803 080

 

 

 

 

 

 

 

 

 

 

 

Trouble

Possible Causes

Remedy

 

 

 

No weld output; unit completely

Line disconnect switch open.

Place line disconnect switch in On position (see Section

inoperative.

 

3-12).

 

 

 

 

 

 

 

 

Blown line fuse(s).

Check and replace line fuse(s), if necessary, or reset

 

 

 

 

circuit breaker (see Section 3-12).

 

 

 

 

 

 

 

 

Improper input power connections.

Check for proper input power connections (see Section

 

 

 

 

3-12).

 

 

 

No weld output.

Line voltage too high or too low.

Line voltage must be within ±10%.

Blue LED flashes continuously, yellow

 

 

 

 

LED off.

Unit not linked correctly.

Check line voltage and link unit accordingly.

 

 

 

 

 

 

 

 

Unit needs to be reset.

Cycle power switch off and back on again. If problem is not

 

 

 

 

corrected, contact nearest Factory Authorized Service

 

 

 

 

Agent.

 

 

 

No weld output.

Voltage in excess of 100 V from an

Check and correct any external voltage sources.

Blue LED flashes 4 times repeatedly,

external source across output studs.

 

yellow LED off.

 

 

 

 

 

No weld output.

Short circuit across output studs.

Check and correct any short circuit conditions.

Blue LED flashes 5 times repeatedly,

 

 

yellow LED off.

 

 

 

 

 

Low weld output.

Single phase rating exceeded (output

Reduce output to 200 amperes or less.

Blue LED flashes 2 times repeatedly,

foldback due to excessive input current).

 

yellow LED off.

 

 

High output VA coupled with a low 230

Check line voltage and weld settings.

 

 

 

 

 

 

voltage line (output foldback due to

 

 

 

 

excessive input current).

 

 

 

 

No weld output.

Remote trigger left on.

Turn off remote trigger, wait approximately 5 seconds, and

Blue LED flashes 3 times repeatedly,

 

restart operation.

yellow LED off.

 

 

 

 

 

No weld output.

Internal component failure.

Contact nearest Factory Authorized Service Agent.

Blue LED flashes 6 times repeatedly,

 

 

yellow LED off.

 

 

 

 

 

No weld output.

Unit overheated.

Allow unit to cool.

Blue LED off, yellow LED on.

 

 

 

 

 

No weld output.

Thermistor failure.

Have Factory Authorized Service Agent check thermistor.

Blue LED off, yellow LED flashes

 

 

continuously.

 

 

 

 

 

Fan not operating.

Blocked fan blade.

Check and remove anything blocking fan blade movement.

 

 

 

 

 

 

 

 

Fan failure.

Have Factory Authorized Service Agent check fan motor.

 

 

 

 

 

OM-220 812 Page 24

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Contents Processes OM-220 812BDescription From Miller to You Table of Contents Page Symbol Usage Marks a special safety messageArc Welding Hazards Electric Shock can killARC Rays can burn eyes and skin Welding can cause fire or explosionFlying Metal can injure eyes Buildup of GAS can injure or killCalifornia Proposition 65 Warnings EMF Information Principal Safety StandardsAbout Pacemakers Signification des symboles − Consignes DE Sécurité − À Lire Avant UtilisationLES Décharges Électriques peuvent être mortelles LES Fumées ET LES GAZ peuvent être dangereuxLE Soudage peut causer un incen- die ou une explosion LES Particules Projetées peu- vent blesser les yeuxLES Pièces Chaudes peuvent cau- ser des brûlures graves LE Bruit peut affecter l’ouïeRisque D’INCENDIE OU D’EXPLO LA Chute DE L’APPAREIL peut blesser’EMPLOI Excessif peut Faire LES Pièces Mobiles peuvent cau- ser des blessuresInformation sur les champs électromagnétiques Principales normes de sécuritéConsignes relatives aux stimulateurs cardiaques Specifications − InstallationDuty Cycle And Overheating Stick Smaw Volt-Ampere Curves DC AmpsTIG Gtaw Volt-Ampere Curve Selecting a Location Dimensions And WeightLocation And Airflow Weld Output Terminals And Selecting Cable Sizes 150 ft 200 ft 250 ft350 ft 400 ft 45 m 60 m 70 m 90 m 105 m 120 m Terminals AmperesPositive + Weld Output Terminal Electrical Service Guide 50/60 Hz Single-Phase 50/60 Hz Three-PhaseStick Dcep Direct Current Electrode Positive Connections Input VoltageSelecting 220 Volts AC Single/Three Phase Input Voltage Selecting 400 440 Volts AC Three Phase Input Voltage Relinking Board Connection For 400 440 VAC Input PowerConnecting Input Power For three-phase operationFor single-phase operation = GND/PE− Operation ControlsProcess Select Control Lift-ArctTIG NormalStick Start Procedure − Scratch Start Technique Lift-ArcStart ProcedureLift-Arc Start ApplicationAmp Adjust Control Remote 14 Receptacle InformationFan-On-Demand Rack Mounting− Maintenance and Troubleshooting Routine MaintenanceBlowing Out Inside Of Unit MonthsTroubleshooting Trouble Possible Causes RemedyUse proper size and type of weld cable see Section − Electrical Diagrams Circuit Diagram− Selecting and Preparing Tungsten Electrode Safety Information About TungstenSelecting Tungsten Electrode Tungsten Electrode OM-220 812 − Parts List Main AssemblyCAPACITOR,ELCTLT 2400 UF 500 VDC can 2.5 DIA Panel, Front w/Components Panel, Rear w/Components Magnetics Subassembly Heat Sink Assembly, Output Diode Base Assembly Heat Sink Assembly, Input Page Service SupportOwner’s Record Miller Electric Mfg. Co
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