Lincoln Electric IM904 MAINTENANCE

D-1

MAINTENANCE

D-1

INVERTEC STT II (CE)

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.

Contents

Main INVERTEC S T T II (CE) OPERATORS MANUAL IM904 Safety Depends on You ISO/IEC 60974-1 FOR ENGINE powered equipment. i Mar 95 ELECTRIC AND MAGNETIC FIELDS may be dangerous ii ARC RAYS can burn. ELECTRIC SHOCK can kill. FUMES AND GASES can be dangerous. FOR ELECTRICALLY powered equipment. CYLINDER may explode if damaged. iii Mar 95 WELDING SPARKS can cause fire or explosion. PRCAUTIONS DE SRET PRCAUTIONS DE SRET POUR LES MACHINES SOUDER TRANSFORMATEUR ET REDRESSEUR vv Thank You Please Examine Carton and Equipment For Damage Immediately On-Line Product Registration vi vi TABLE OF CONTENTS TECHNICAL SPECIFICATIONS INVERTEC STT II (CE) (For Code 11366) TECHNICAL SPECIFICATIONS INVERTEC STT II (CE) (For Code 11367) A-3 MACHINE GROUNDING AND HIGH FREQUENCY INTERFERENCE PROTECTION INPUT CONNECTIONS SUPPLYCONNECTIONS SELECT SUITABLE LOCATION STACKING CASE BACK RATING PLATE INPUT CABLE ENTRY ACCESS & CABLE STRAIN RELIEF A-5 I A-5 FIGURE A.2 RECONNECT PANEL NPUT VOLTAGE RECONNECT PROCEDURE OUTPUT CONNECTIONS OPERATING INSTRUCTIONS GENERAL WARNINGS SAFETY PRECAUTIONS B-2 GENERAL DESCRIPTION RECOMMENDED EQUIPMENT OPERATING CONTROLS DESIGN FEATURES AND ADVANTAGES WELDING CAPABILITY OPERATIONAL FEA TURES AND CONTROLS FIGURE B.1 CASE FRONT CONTROLS A V B-4 WELDING OPERATION B-5 WELDING PARAMETERS AND GUIDE- LINES B-6 WELDING PROCEDURES FOR STT II - C-1 OPTIONS / ACCESSORIES + ARC - ARC PORTION OF G3136 WIRING DIAGRAM REFER TO ACTUAL DIAGRAM PASTED INSIDE YOUR MACHINE C-2 FIGURE C.2 LN-742 to STT II CONNECTION LN-742 or STT-10 WIRE FEEDER CONNECTION INSTRUCTIONS C-3 FIGURE C.3 STT-10 to STTII CONNECTION CONNECTION DIAGRAM - INVERTEC STT II D-1 MAINTENANCE D-1 INPUT FILTER CAPACITOR DISCHARGE PROCEDURE D-2 MAINTENANCE D-2 PREVENTIVE MAINTENANCE E-1 HOW TO USE TROUBLESHOOTING GUIDE E-2 OUTPUT PROBLEMS Observe Safety Guidelines detailed in the beginning of this manual. PROBLEMS (SYMPTOMS) POSSIBLE CAUSE RECOMMENDED COURSE OF ACTION E-3 OUTPUT PROBLEMS Observe Safety Guidelines detailed in the beginning of this manual. PROBLEMS (SYMPTOMS) POSSIBLE CAUSE RECOMMENDED COURSE OF ACTION Page Page Page F-1 } N.G. (VIEWED FROM WIRE SIDE OF CONNECTOR) } } } F-1 A } } } DRIVER J16, J28 } } } } J6, J27, J33 DIMENSION PRINT - STT II (CE) Page Page Page AVISO DE PRECAUCION ATTENTION WARNUNG ATENO AVISO DE PRECAUCION ATTENTION WARNUNG ATENO