Troubleshooting & repair, Discharge procedure, Warning – Lincoln Electric Invertec V205-T User Manual
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TROUBLESHOOTING & REPAIR
F-14
F-14
V205-T AC/DC
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
to avoid electric shock.
DISCHARGE PROCEDURE
1.
Remove the input power to the machine.
2. Using the phillips head screwdriver remove the
screws securing the case wraparound cover.
3. Be careful not to make contact with the capacitor
solder pads located at the top of the IGBT power
board.
4. Obtain a high resistance and high wattage resistor
(25-1000 ohms and 25 watts minimum). This
resistor is not with the machine. NEVER USE A
SHORTING STRAP FOR THIS PROCEDURE.
5. Locate the eight capacitor solder pads shown in
Figure F.3.
6. Using electrically insulated gloves and pliers, hold
the body of the resistor with the pliers and con-
nect the resistor leads across the two capacitor
solder pads. Hold the resistor in place for 10 sec-
onds. DO NOT TOUCH CAPACITOR SOLDER
PADS WITH YOUR BARE HANDS.
7. Repeat the discharge procedure for the other
three capacitors.
8. 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.
WARNING
Capacitor Solder
Pads
Resistor
FIGURE F.3 – LOCATION OF INPUT FILTER CAPACITOR TERMINALS ON MAIN IGBT INVERTER BOARD
INPUT FILTER CAPACITOR DISCHARGE PROCEDURE (continued)