Lincoln Electric V155-S service manual Input Filter Capacitor Discharge Procedure

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F-10	TROUBLESHOOTING & REPAIR	F-10
	INPUT FILTER CAPACITOR DISCHARGE PROCEDURE (CONTINUED)
	FIGURE F.2 – CAPACITOR DISCHARGE LOCATIONS
	INPUT BOARD

CAPACITOR TERMINALS (4 places)

DC-

DC+

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WARNING

ELECTRIC SHOCK can kill.

•Have an electrician install and service this equipment.

•Turn the input power off at the fuse box before working on equipment.

•Do not touch electrically hot parts.

•Prior to performing preventative maintenance, perform the following capacitor discharge procedure

PROCEDUREto avoid electric shock.

1. Disconnect power to the INVERTEC® V155-S.

2. Perform the Case Cover Removal Procedure, steps 1 thru 3.

3. Locate the Input Board.

4.Obtain a high resistance and high wattage resistor (25-1000 ohms and 25 watts minimum). This resis- tor is NOT supplied with the machine. NEVER USE A SHORTING STRAP FOR THIS PROCEDURE.

5.Locate the two terminals DC+ and DC- on the Input Board. See Figure F.2.

6.Use electrically insulated gloves and insulated pli- ers. Hold the body of the resistor and connect the resistor leads across the two terminals. Hold the resistor in place for 10 seconds. DO NOT TOUCH CAPACITOR TERMINALS WITH YOUR BARE HANDS. See Figure F.3.

7.Check the voltage across the terminals of all capacitors with a DC voltmeter. Voltage should be zero. If any voltage remains, repeat this capacitor discharge procedure.

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FIGURE F.3 – GLOVE, PLIERS & REISISTOR

INSULATEDPLIERS

INSULATED

RESISTOR GLOVES

INVERTEC® V155-S