An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Test to continue......
first test +16v 6amp -16v 6amp
Gev-
How does the PWM get power at start-up? Did you re-wound the driver xfmr? In original configuration the driver xfmr is used as a "proportional base drive", which runs for a second or two as a free-running oscillator at start-up, to generate secondary voltage for the PWM. Only after sufficient voltage has built up, does the Tl494 take over control.
This is seen by noticing the "extra" winding on the drvr xfmr to start the oscillator.
How does the PWM get power at start-up? Did you re-wound the driver xfmr? In original configuration the driver xfmr is used as a "proportional base drive", which runs for a second or two as a free-running oscillator at start-up, to generate secondary voltage for the PWM. Only after sufficient voltage has built up, does the Tl494 take over control.
This is seen by noticing the "extra" winding on the drvr xfmr to start the oscillator.
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