Lincoln Electric 11694 Service Manual page 66

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POWER WAVE S350
PROCEDURE
1. Remove the input power to the Power Wave S350 machine.
2. Perform the Case Cover Removal and DC Link Capacitor
Discharge Procedure.
3. Locate the DC bus board. See Figure F.26.
4. Carefully apply the correct input voltage to the Power Wave S350
machine.
5. Locate LED 1 on the DC bus board. See Figure F.27. If LED 1 is
bright red and steady, the DC bus board is OK. If the LED 1 is dim
or not steady, remove the input power and disconnect Plug J47.
See Figure F.27. When power is reapplied, if the LED 1 is bright
and steady, check leads 356 - 358 for a heavy load or short on
leads 51-52. See Wiring Diagram.
6. If LED 1 is NOT ON proceed to the next steps.
7. Carefully check to ensure that the correct input voltage (48VDC) is
being applied to the DC bus board. Plug J46 Pin 1 (lead 65+) to
Plug J46 Pin 3 (lead 66-). See Figure F.27. See Wiring Diagram.
8. If the correct input voltage (48VDC) is not present, check the
circuit breaker and associated wiring between the DC bus board
and the switch board. See Wiring Diagram.
9. If the correct input voltage is being applied to the DC bus board,
check for the correct output voltages.
DC BUS BOARD TEST
Figure F.26 – DC bus board location
(continued)
DC BUS
BOARD
10. Check for the presence of 40VDC at Plug J47 Pin1 (Lead 51-)
to Plug J47 Pin 8 (Lead 52+). See Figure F.27. See Wiring
Diagram.
11. Check for the presence of 40VDC at Plug J47 Pin5 (Lead 356-)
to Plug J47 Pin4 (Lead 358+). See Figure F.27. See Wiring
Diagram.
12. If the correct input voltage is being applied to the DC bus board
and the output voltages are not correct or missing, the DC bus
board may be faulty.
13. Remove the input power to the Power Wave S350 machine.
14. If faulty, perform the DC Bus Board Removal And
Replacement Procedure.
15. Perform the Case Cover Replacement Procedure.
TROUBLESHOOTING AND REPAIR
60