Welder User Manual

SWITCH
BOARD
CAPACITOR
TERMINALS
FIGURE F.1 – CAPACITOR DISCHARGE PROCEDURE
INPUT FILTER CAPACITOR DISCHARGE PROCEDURE (CONTINUED)
PROCEDURE
1. Disconnect the input power to the POWER
WAVE 655/R.
2. Remove the left and right case sides.
3. Remove the two High Voltage Protection
shields. Be careful not to touch the capacitor
terminals that are located at the bottom of the
left and right side switch boards.
4. With a voltmeter, carefully check for a DC volt-
age at the capacitor terminals of both boards.
Note the polarity as marked on the PC board.
5. If any voltage is present, proceed to Step #6. If
no voltage is present, the capacitors are dis-
charged.
NOTE: Normally the capacitors discharge with-in
about two minutes after input power is
removed.
6. Using the high wattage resistor (25-1000 ohms
@ 25 watts), with electrically insulated gloves
and pliers, touch the resistor across the two
capacitor terminals. Hold the resistor in place
for 10 seconds. DO NOT TOUCH THE
CAPACITOR TERMINALS WITH YOUR BARE
HANDS. NEVER USE A SHORTING STRAP
FOR THIS PROCEDURE.
7. Repeat procedure for the other capacitors.
8. Recheck the voltage across the capacitor termi-
nals. The voltage should be zero. If any voltage
remains, repeat the discharge procedure.
NOTE: If the capacitor voltage is present after the
discharge has been performed, this may
indicate a faulty switch board.
TROUBLESHOOTING & REPAIR
F-12 F-12
POWER WAVE 655/R
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