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TROUBLESHOOTING & REPAIR |
ABNORMAL OUTPUT VOLTAGE WAVEFORM - MACHINE LOADED ONE OUTPUT SCR NOT FUNCTIONING
0 VOLTS
20.0 V | 5 ms |
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MACHINE LOADED TO 220 AMPS AT 22 VDC |
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| SCOPE SETTINGS |
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This is NOT a typical DC output voltage |
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waveform. One output SCR is not function- | Volts/Div | 20 V/Div |
ing. Note the increased ripple content. One |
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SCR gate was disconnected to simulate an | Horizontal Sweep | 5 ms/Div |
open or |
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vertical division represents 20 volts and | Coupling | . . . . DC |
each horizontal division represents 5 mil- |
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liseconds in time. The machine was loaded | Trigger | . Internal |
with a resistance grid bank. |
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NOTE: Scope probes connected at machine |
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output terminals: (+) probe to electrode, |
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probe to work. |
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