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F-37

F-37

TROUBLESHOOTING & REPAIR

TYPICAL SCR GATE VOLTAGE WAVEFORM

MAXIMUM OUTPUT SETTING – NO LOAD

CH1

0 volts

2 volts

5 ms

This is the typical SCR gate pulse voltage waveform. The machine was in an open circuit condition (no load) and operating properly. Note that each vertical division represents 2 volts and that each horizontal division represents 5 milliseconds in time.

Note: Scope probes connected at

SCR gate and cathode: (+) probe to

gate and cathode: (+) probe to gate, (-) probe to cathode. (R3R 500 machine)

SCOPE SETTINGS

Volts/Div

2V/Div.

Horizontal Sweep

5 ms/Div.

Coupling

DC

Trigger

Internal

 

 

IDEALARC R3R

Page 71
Image 71
Lincoln Electric R3R-500, R3R-300 service manual Typical SCR Gate Voltage Waveform, CH1