Lincoln Electric 11694 Service Manual page 26

®
POWER WAVE S350
CASE COVER REMOVAL AND REPLACEMENT AND
DC LINK CAPACITOR DISCHARGE PROCEDURE
HANDLE
MOUNTING
SCREWS
REMOVAL PROCEDURE
1. Remove the input power to the Power Wave S350 machine.
2. Using the 5/16" nutdriver, remove the three screws and flat
washers securing each of the four (top) corner end caps (twelve
screws and flat washers total) to the machine. See Figure F.1.
Note washer placement for reassembly.
3. Using the 5/16" nutdriver, remove the four screws securing the
left case side to the machine. See Figure F.1.
4. Using a 5/16" nutdriver, remove the four screws securing the right
case side to the machine. See Figure F.1.
5. Using a 7/16" nutdriver, remove the four screws and washers
securing each handle to the machine (eight screws and washers
total). See Figure F.1.
6. Using a 5/16" nutdriver, remove the two screws securing the roof
to the machine. See Figure F.1.
Figure F.1 – Case cover removal procedure
ROOF
MOUNTING SCREWS
CAPACITOR DISCHARGE PROCEDURE
7. Locate the DC link capacitor. See Figure F.2.
8. Using a volt/ohmmeter, check the voltage across the terminals of
9. If any voltage is present, using the high wattage resistor (25-1000
NOTE: DO NOT TOUCH THE CAPACITOR TERMINALS WITH YOUR
10. Using a volt/ohmmeter, recheck the voltage across the capacitor
11. If any voltage remains, repeat the discharge procedure.
NOTE: Any voltage present after discharge has been performed, is an
12. Using a volt/ohmmeter, carefully check for DC voltage at B48 -
13. If voltage is present, wait for voltage to decay before proceeding.
TROUBLESHOOTING AND REPAIR
CASE SIDE
MOUNTING SCREWS
(FOUR ON EACH SIDE)
the DC link capacitor. See Figure F.3. See Wiring Diagram.
ohms @ 25 watts minimum), electrically insulated gloves and
pliers, discharge the capacitor by holding the resistor terminals
on the capacitor terminals for 10 seconds. See Figure F.3. See
Wiring Diagram.
BARE HANDS. NEVER USE A SHORTING STRAP FOR THIS
PROCEDURE.
terminals. See Figure F.3. See Wiring Diagram. The voltage
should be zero.
abnormal condition and may indicate a switch board problem.
B49 on the switch board. See Figure F.3. See Wiring Diagram.
(continued)
TOP CORNER CAP
MOUNTING SCREWS
(THREE FOR EACH CORNER CAP TWELVE TOTAL)
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