Maintenance, Input filter capacitor discharge procedure, Warning – Lincoln Electric PRO-CUT 55 SVM140-A User Manual

Page 25

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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, per-

form the following capacitor discharge procedure to
avoid electric shock.

INPUT FILTER CAPACITOR
DISCHARGE PROCEDURE

1. Turn off input power or disconnect input power

lines.

2. Remove the 5/16 in. hex head screws from the side

and top of the machine and remove wrap-around
machine cover.

3. Be careful not to make contact with the capacitor

terminals that are located on the top and bottom of
the Power Board on the right side of the machine.

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) on the top and bottom of the Power
Board shown in Figure D.1.

6. Use electrically insulated gloves and insulated pli-

ers. Hold the body of the resistor and connect
resistor leads across the two capacitor terminals.
Hold the resistor in place for 10 seconds. DO NOT
TOUCH CAPACITOR TERMINALS WITH YOUR
BARE HANDS.

7. Repeat the discharge procedure for the other

capacitor.

8. Check voltage across the terminals of all capaci-

tors with a DC voltmeter. Polarity of capacitor ter-
minals is marked on the Power Board above termi-
nals. Voltage should be zero. If any voltage
remains, repeat this capacitor discharge proce-
dure.

MAINTENANCE

D-2

PRO-CUT 55