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Magic Pie & Smart Pie Discussions / Re: 52v MagicPie 5 lacking power above 12mph
« Last post by Bikemad on December 11, 2023, 09:58:23 PM »Hi andto the forum.
If you raise the wheel off the ground and the maximum unloaded wheel rpm is still much slower than it should be, then it is most likely caused by a low throttle signal voltage.
The controller requires a throttle signal voltage of at least 3.25V to produce maximum motor rpm, but this voltage can be much lower if the controller's +5V regulated supply has been overloaded or has simply become weak over time.
If you are able to measure the voltage on the throttle signal circuit (with everything connected) this would help to confirm the suspected cause of the problem.
You should be able to measure the +5V output with a voltmeter connected between battery negative and pin 1 on one of the brake connectors:
If you wrap some insulation tape (or a small section of wire insulation) around the tip of the red meter probe, it should prevent you from accidentally shorting the pins inside the brake switch connector:
Check out this post for further information.
If the +5V supply is below 3.5~4V then the throttle will probably be unable to output the required signal voltage to produce the expected maximum rpm.Pi-80I
Alan
If you raise the wheel off the ground and the maximum unloaded wheel rpm is still much slower than it should be, then it is most likely caused by a low throttle signal voltage.
The controller requires a throttle signal voltage of at least 3.25V to produce maximum motor rpm, but this voltage can be much lower if the controller's +5V regulated supply has been overloaded or has simply become weak over time.
If you are able to measure the voltage on the throttle signal circuit (with everything connected) this would help to confirm the suspected cause of the problem.
You should be able to measure the +5V output with a voltmeter connected between battery negative and pin 1 on one of the brake connectors:
If you wrap some insulation tape (or a small section of wire insulation) around the tip of the red meter probe, it should prevent you from accidentally shorting the pins inside the brake switch connector:
Check out this post for further information.
If the +5V supply is below 3.5~4V then the throttle will probably be unable to output the required signal voltage to produce the expected maximum rpm.Pi-80I
Alan