Lincoln Electric INVERTEC SVM101-B Service Manual page 42

F-12
INPUT FILTER CAPACITOR DISCHARGE PROCEDURE (cont.)
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 14 5/16" hex head screws from side and
top of machine (6 screws on each side and 2
screws on top) 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.
FIGURE F.I - LOCATION OF INPUT FILTER CAPACITOR TERMINALS
TROUBLESHOOTING & REPAIR
V300-I
5. Locate the two capacitor terminals (large hex head
capscrews)shown in Figure F.1.
6. Use electrically insulated gloves and insulated pli-
ers. Hold body of the resistor and connect resistor
leads across the two capacitor terminals. 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. If you are working on a 575 VAC
machine, repeat discharge procedure for second
capacitor on each 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.
F-12