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General Discussions / Re: VEC300 with 5kW motor
« Last post by Bikemad on April 28, 2025, 12:15:46 AM »As as safety feature I've purchased potentiometer with a Detent at zero. Here is the bench test profile:
Digikey potentiometer bench results:
Position Black–Red (O, V) Black–Green (O, V) Red–Green (O, V) Idle (0%) 0 O, 0.00 V 10.00 kO, 0.00 V 10.00 kO, 0.00 V 25% ~2.5 kO, 1.25 V ~7.5 kO, 1.25 V ~5.0 kO, 3.75 V 50% ~5.0 kO, 2.50 V ~5.0 kO, 2.50 V ~5.0 kO, 2.50 V 75% ~7.5 kO, 3.75 V ~2.5 kO, 3.75 V ~7.5 kO, 1.25 V Full (100%) 10.00 kO, 5.00 V 0 O, 5.00 V 10.00 kO, 0.00 V
Any Way to make this work?
Something doesn't look right with those readings, it looks as if you may have the wires incorrectly connected to the potentiometer pins because the resistance or voltage reading between the Red and Black should remain at 10kOhm or ~5V regardless of the position of the potentiometer's wiper.
"A" = Black (0V) "W" = Green (Throttle signal) "B" = Red (+5V)

Fitting resistors on the Red and Black wires as per the above diagram should allow that potentiometer to operate as a throttle.
According to my calculations, if you used a 2.4kOhm resistor on the Black (0V) wire (instead of the 1.5kOhm resistor shown above) this should produce a throttle signal output voltage of 0.83V to 4.31V with a 5V supply.
Alan