Miller Electric MOG-350, MOG-300, MOG-250, MOG-Pak, MOG-400, RGC Overload Protection, Troubleshooting

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5-2. Overload Protection

Grid Rear Panel

1

Multi-Grid Rack

Fuse link F1, or fuse links F1 and F2 for dual models, protect the grid from overload damage. If weld output stops, check link(s) as follows:

Turn Off welding power source and disconnect input power.

1Fuse Link (See Parts List For Rating)

Check and replace fuse link(s), if necessary.

Close rear access door.

Ref. ST-124 643-A / Ref. ST-161 156-A

5-3. Troubleshooting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Trouble

Remedy

 

 

No weld output.

Check and replace open fuse link(s), if necessary (see Section 5-2).

 

 

 

 

 

 

 

 

 

 

 

Check electrical input and output connections (see Section 3-3).

 

 

Erratic or improper weld output.

Select correct size weld cables according to Section 3-7.

 

 

 

 

 

 

 

 

 

 

 

Clean and tighten weld cable connections (see Section 3-3).

 

 

 

 

 

 

 

 

 

 

 

For dual models, be sure paralleling switch is in proper position (see Section 4-7).

 

 

 

 

 

 

 

 

 

 

 

If using remote control, be sure Fine Amperage control and 2-1/2 Ampere switch on grid are in the Off

 

 

 

 

 

position (see Section 4-5).

 

 

 

 

 

 

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Contents
Processes OM-808Description From Miller to You Table of Contents Page Marks a special safety message Symbol UsageArc Welding Hazards Electric Shock can killWelding can cause fire or explosion ARC Rays can burn eyes and skinFlying Metal can injure eyes Buildup of GAS can injure or killPrincipal Safety Standards About Pacemakers EMF InformationConsignes DE Securite Lire Avant Utilisation Signification des symbolesUN Choc É Lectrique peut tuer LES Fumé ES ET LES GAZ peuvent ê tre dangereuxDES Particules Volantes peuvent blesser les yeux LE Soudage peut provoquer un incendie ou une explosionLE Bruit peut affecter l’ouïe LA Chute DE L’APPAREIL peut blesser Risque D’INCENDIE OU’EMPLOI Excessif peut DES Organes Mobiles peuvent provoquer des blessuresInformation sur les champs é lectromagné tiques Principales normes de sé curitéConsignes relatives aux stimulateurs cardiaques Resistance Grid SpecificationsGrid Rack Typical Multiple Operator System Component Relationships InstallationResistance Grid Turn Off welding power source Before moving grid or rackMulti-Grid Rack Tools Needed Weld Input/Output Cables For Multi-Grid Rack Male Camlok Connector Assembly Female Camlok Connector AssemblyOptional Remote Receptacle Information And Connections Weld Cable Size150 ft 200 ft 250 ft 300 ft 350 ft 45 m 60 m 70 m 90 m 105 m 120 mOperation Safety EquipmentControls Dual Model Shown Arcing can damage switch Optional Polarity SwitchWork Clamp Amperage Controls Optional Remote Grid Amperage Control Paralleling Switch Dual Models OnlyRoutine Maintenance Months Maintenance & TroubleshootingTurn Off all power before maintaining Sequence Of Shielded Metal Arc Welding SmawOverload Protection TroubleshootingCircuit Diagram For 300 Ampere Model Electrical DiagramsCircuit Diagram For 400 Ampere Model Circuit Diagram For 250/250 Ampere Model Circuit Diagram For 350/350 Ampere Model Main Assembly Parts ListDia Part Panel, Front w/Components Nameplate Resistor Assembly, Current 049 BUS BAR, interconnecting resistors MOG-Pak 6 APR Optional Equipment MOG-Pak 2, 4Remote Control Support ServiceMiller Electric Mfg. Co Owner’s Record