Board according to table f.4, Troubleshooting & repair, Dc bus board test (continued) – Lincoln Electric POWER WAVE 355/405 SVM159-A User Manual

Page 71: Warning

TROUBLESHOOTING & REPAIR

F-29

POWER WAVE 355/405

DC BUS BOARD TEST(CONTINUED)

6. Check the DC Bus Board input and output

voltages according to Table F.4. See Figure
F.6 and the Wiring Diagram.

ELECTRIC SHOCK can kill.

High voltage is present at the
terminals of Capacitor C3 near
where testing is to be done.

7. If all the voltages are correct, the DC Bus

Board is operating properly.

8. If any of the output voltages are not correct

and the input voltage is correct, the DC Bus
Board may be faulty.

9. If the input voltage is not correct, check the

leads between the DC Bus Board and the
Bus Rectifier. See the Wiring Diagram.

10. When finished testing, replace the case

wraparound cover.

WARNING

Plug P46 – Pin 1

Lead 65

Plug P47 – Pin 8(+)

Lead 52

Plug P47 – Pin 3(+)

Lead 477

Plug P46 – Pin 3

Lead 66

Plug P47 – Pin 1(-)

Lead 51

Plug P47 – Pin 6(-)

Lead 475

65 – 75 VDC

38.0 – 42.0 VDC

Should be same as the

Bus Rectifier

Supply to the Wire

Feeder Receptacle

Supply to Power Board

Positive Meter Probe

Test Point

Negative Meter Probe

Test Point

Approximate Voltage

Reading

Conditions/Comments

TABLE F.4 – DC BUS POWER SUPPLY PC BOARD VOLTAGE TABLE