Miller Electric Metro 250D manual Overload Protection, Weld And Auxiliary Power Circuits

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7.7Overload Protection

YStop engine. If checking fuse, disconnect battery negative (−) cable.

.Press button to reset circuit

breaker. If fuse or breaker continues to open, contact Factory Authorized Service Agent.

Weld And Auxiliary Power Circuits

1 Fuse F2

F2 protects battery excitation circuit. If F2 opens, weld and auxil- iary output stops.

2 Fuse F3

F3 protects generator excitation circuit. If F3 opens, weld and auxil- iary power output is low.

Replace any open fuses. Reinstall panel before operating unit.

Remote Control Circuit

Ref. ST-159 215-E / Ref. ST-158 936-D / Ref. St-175 918-C

3

4

3 Circuit Breaker CB5

CB5 protects 24 volt ac output to Remote 14 receptacle RC1. If CB5 opens, RC1 24 volt output stops.

Engine Control Circuit

4Circuit Breakers CB6, CB7, CB8, And CB9

CB6 protects fuel solenoid circuit. If CB6 opens, the engine does not start.

CB7 protects throttle solenoid circuit. If CB7 opens, the engine does not run at weld/power speed.

CB8 protects Engine Control switch and wiring harness. If CB8 opens, the engine does not crank.

CB9

CB8

CB7

CB6

2

1

CB9 protects optional glow plug system. If CB9 opens, the glow plug does not work.

S-179 489

Tools Needed:

3/8 in

OM-402

29

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Contents OM-402B ProcessesDescription From Miller to You Metro 250D Table of ContentsPage Safety Precautions − Read Before Using Symbol UsageArc Welding Hazards Engine Hazards Moving Parts can cause injury Battery Explosion can BlindEngine Exhaust Gases can kill Engine Heat can cause fireEMF Information Principal Safety StandardsRadiation can cause interference ARC Welding can cause interferenceConsignes de sécurité − lire avant utilisation Signification des symbolesUN Choc Électrique peut tuer LES Fumées ET LES GAZ peuvent être dangereuxDES Particules Volantes peuvent blesser les yeux LE Soudage peut provoquer un in- cendie ou une explosionDES Pièces Chaudes peuvent provoquer des brûlures graves LE Bruit peut affecter l’ouïe’EXPLOSION DE LA Batterie peut DES Organes Mobiles peuvent provoquer des blessuresLA Chaleur DU Moteur peut pro- voquer un incendie LA Chute DE L’APPAREIL peut blesserInformation sur les champs électromagnétiques Principales normes de sécuritéÉlectrostatiques peuvent endommager les circuits imprimés UNE Remorque QUI Bascule peut entraîner des blessuresDefinitions Symbols and DefinitionsGeneral Precautionary Label Fan and Moving Parts Label Battery Charging LabelDiesel Fuel Label Hot Muffler LabelFalling Equipment Label Activation Tag− 50 h Std Manufacturer’s Rating Label Do Not Use Ether LabelWeld, Power, and Engine Specifications SpecificationsDimensions, Weights, and Operating Angles Volt-Ampere CurveDuty Cycle and Overheating Fuel ConsumptionAC Auxiliary Power Curve InstallationInstalling Welding Generator Location GroundingEngine Prestart Checks Connecting Battery and Installing Exhaust PipeStop engine Connect negative − cable lastSelecting Weld Cable Sizes Connecting to Weld Output Terminals100 ft 30 m or Less 10 − 60% 60 − 100% Duty 10 − 100% Duty CycleRemote 14 Receptacle RC1 Information Ref. ST-158Socket Information Operating the Welding Generator Using Idle Lock SwitchFront Panel Controls PlugRemote Amperage and Contactor Control Operating Auxiliary Equipment Auxiliary Power ReceptaclesMaintenance & Troubleshooting 100 Hrs Maintenance Changing Engine Oil and Oil Filter To Clean air filter Servicing Air CleanerDo not clean housing with air hose Changing Fuel FiltersAdjusting Engine Speed Idle Speed AdjustmentWeld/Power Speed Adjustment Remote Control Circuit Weld And Auxiliary Power CircuitsOverload Protection Engine Control CircuitStop engine and let cool. Reinstall cleanout plug Welding TroubleshootingServicing Optional Spark Arrestor Trouble RemedyEngine Troubleshooting Auxiliary Power TroubleshootingUle OM-402 Circuit Diagram for Welding Generator Electrical DiagramSC-181 Run-In Procedure WetstackingHeavy loading during first Load Bank Run-In Procedure Using Load BankRun-In Procedure Using Resistance Grid Auxiliary Power Guidelines Selecting EquipmentGrounding Generator to Truck or Trailer Frame Grounding When Supplying Building Systems How Much Power Does Equipment Require?Amperes x Volts = Watts Approximate Power Requirements for Farm/Home Equipment Approximate Power Requirements for Industrial MotorsIndustrial Motors Rating Starting Watts Running Watts Farm/Home Equipment Rating Starting Watts Running WattsContractor Rating Starting Watts Running Watts Approximate Power Requirements for Contractor EquipmentHow Much Power Can Generator Supply? Power Required to Start MotorSingle-Phase Induction Motor Starting Requirements KVA/HP x HP x 1000 = Starting Amperage VoltsTypical Connections to Supply Standby Power Current Load Watts Amperes Selecting Extension Cord Use Shortest Cord PossibleMain Assembly Parts ListST-801 488-A PC6 11.1CB9 Panel, Front w/Components .1 Item CB5 11.2Generator .1 Item Diode Board Control Box w/Components .1 ItemOM-402 Page OM-402 Page Metro 250D Options and AccessoriesCall Miller for your local Miller distributor Miller Electric Mfg. Co Owner’s Record