Troubleshooting & repair – Lincoln Electric WIRE-MATIC 255 SVM 119-A Manuel d'utilisation

Page 76

Advertising
background image

Retur

n to Section TOC

Retur

n to Section TOC

Retur

n to Section TOC

Retur

n to Section TOC

Retur

n to Master TOC

Retur

n to Master TOC

Retur

n to Master TOC

Retur

n to Master TOC

F-25

TROUBLESHOOTING & REPAIR

F-25

WIRE-MATIC 255

This is NOT the typical DC output voltage
waveform. The output capacitors are not
functioning. Note the lack of “filtering” in the
output waveform. The output capacitor
bank was disconnected. Each vertical divi-
sion represents 20 volts and each horizontal
division represents 5 milliseconds in time.

Note: Scope probes connected at machine
output terminals: (+) probe to electrode, (-)
probe to work.

Volts/Div . . . . . . . . . . . . . . . . .20 V/Div.

Horizontal Sweep . . . . . . . . . .5 ms/Div.

Coupling . . . . . . . . . . . . . . . . . . . . .DC.

Trigger . . . . . . . . . . . . . . . . . . .Internal.

SCOPE SETTINGS

ABNORMAL OPEN CIRCUIT VOLTAGE

OUTPUT CAPACITOR BANK NOT FUNCTIONING

Advertising