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SVTPerformance's Chain of Restaurants
Road Side Pub
Kids Power Wheel electric question...
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<blockquote data-quote="JPKII" data-source="post: 16897353" data-attributes="member: 12867"><p>Assuming you replaced F/B switch...</p><p></p><p>The accelerator pedal supplies power (yellow wire) to the F/B switch. </p><p></p><p>The accelerator pedal is a potentiometer. So as you press the pedal down, it gives a, presumably, larger voltage reference to the F/B switch which then sends that signal to the speed controller. The F/B switch simply switches the polarity of the signal from the pedal to the speed controller. So the pedal varies output 0 VDC to 5 VDC (probably) on the yellow wire. The F/B switch makes that 0 VDC to "+"5VDC or 0 VDC to "-"5 VDC based on direction selected.</p><p></p><p>I'd measure at the light blue and dark blue wires, from F/B switch, with a voltmeter set to DC and low range (like 20 volts). Put one probe on black wire (common) going to pedal and other probe on each blue wire. See if you can see this signal varying from + to - on each blue wire as you toggle switch and press on pedal. You're gonna need a second set of hands. You'll have to work out the logic or sequence as you're testing. </p><p></p><p>If you see the voltage polarity go from + to -, or vice versa, while toggling the F/B switch, replace the speed control. It's likely the power devices in the speed controller, for the reverse direction, are shot.</p></blockquote><p></p>
[QUOTE="JPKII, post: 16897353, member: 12867"] Assuming you replaced F/B switch... The accelerator pedal supplies power (yellow wire) to the F/B switch. The accelerator pedal is a potentiometer. So as you press the pedal down, it gives a, presumably, larger voltage reference to the F/B switch which then sends that signal to the speed controller. The F/B switch simply switches the polarity of the signal from the pedal to the speed controller. So the pedal varies output 0 VDC to 5 VDC (probably) on the yellow wire. The F/B switch makes that 0 VDC to "+"5VDC or 0 VDC to "-"5 VDC based on direction selected. I'd measure at the light blue and dark blue wires, from F/B switch, with a voltmeter set to DC and low range (like 20 volts). Put one probe on black wire (common) going to pedal and other probe on each blue wire. See if you can see this signal varying from + to - on each blue wire as you toggle switch and press on pedal. You're gonna need a second set of hands. You'll have to work out the logic or sequence as you're testing. If you see the voltage polarity go from + to -, or vice versa, while toggling the F/B switch, replace the speed control. It's likely the power devices in the speed controller, for the reverse direction, are shot. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Road Side Pub
Kids Power Wheel electric question...
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