Lincoln Electric IM904 manual Maintenance, Input Filter Capacitor Discharge Procedure

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D-1

MAINTENANCE

D-1

 

 

 

WARNING

Failure to follow this capacitor discharge procedure can result in electric shock.

INPUT FILTER CAPACITOR

DISCHARGE PROCEDURE

1.Turn off input power or disconnect input power lines.

2.Remove hex head screws from side and top of machine and remove wrap-around machine cover.

3.Be careful not to make contact with the capacitor terminals that are located in the center of the Switch Boards.

4.Obtain a high resistance and high wattage resistor (25-1000 ohms and 25 watts minimum). This resis- tor is not supplied with machine. NEVER USE A

SHORTING STRAP FOR THIS PROCEDURE.

5.Locate the two capacitor terminals (large hex head cap screws) shown in Figure

D.1.

6.Use safety glasses, electrically insulated gloves and insulated pliers. Hold body of the resistor and connect resistor leads across the two capacitor ter- minals. Hold resistor in place for 10 seconds. DO NOT TOUCH CAPACITOR TERMINALS WITH YOUR BARE HANDS.

7.Repeat discharge procedure for capacitor on other side of machine.

8.Check voltage across terminals of all capacitors with a DC voltmeter. Polarity of capacitor terminals is marked on PC board above terminals. Voltage should be zero. If any voltage remains, repeat this capacitor discharge procedure.

FIGURE D.1 — LOCATION OF INPUT FILTER CAPACITOR TERMINALS.

INVERTEC STT II (CE)

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Contents Safety Depends on You Invertec S T T II CESafety California Proposition 65 WarningsElectric Shock can kill Welding Sparks can cause fire or explosion IiiPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcThank You Table of Contents Installation Technical Specifications -INVERTEC STT II CE For CodeINPUT- Three Phase only Stacking Select Suitable LocationInput Connections TiltingInput Cable Installation and CON- Nection Ground ConnectionTo Operate at Procedure Input Voltage Reconnect ProcedureWire Feeder Output Connections Output ConnectionsOperating Instructions Safety PrecautionsOperation General WarningsWelding Capability Design Features and AdvantagesRecommended Equipment Operating ControlsPower Switch Turns output 3B. Peak Current Display Meter ThisWire Feeder Receptacle This is Auxiliary Power Circuit BreakerWelding Parameters and GUIDE- Lines Peak CurrentWelding Procedures for STT Accessories Options / AccessoriesLN-742 or STT-10 Wire Feeder Connection Instructions Figure C.3 STT-10 to STT II Connection Maintenance Input Filter Capacitor Discharge ProcedurePreventive Maintenance Troubleshooting HOW to USE Troubleshooting GuideRecommended Course of Action Problems Symptoms Possible CauseAuthorized Field Service FacilityProblems Possible Symptoms Cause Troubleshooting Troubleshooting Problems Symptoms Possible Cause Wiring Diagram Invertec STT II CE for Code Wiring Diagram Invertec STT II CE for Code DiagramsDimension Print STT II CE DIAGRAMSF-3Invertec STT II CE Invertec STT II CE Invertec STT II CE Precaucion Warnung
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