DerekWillmott
1 µW
- Joined
- Jan 25, 2022
- Messages
- 4
Hi. I'm having some trouble with my GMAC bike build, after several years of excellent service. Lately I have experienced random moments of unwanted braking whenever the motor is active due to pedal input (not when using pure throttle). I have brake lever switches, but the CA3 indicates that they are not sending an erroneous brake signal. The throttle which is used to control braking once the levers are pulled also seems to be working perfectly according to the CA3.
I have noticed three coincident issues. The motor temperature readout on the CA3 reads below zero when the motor is at ambient temps (+18 today). If I unplug the motor connector it reads -25/26. This issue seems to match up with the braking problem, ie. they are both intermittent and come on/off roughly together. Secondly, the throttle will power the bike on the first use of the throttle after turning on the battery switch, but once released will not provide power on subsequent attempts until the battery switch is cycled again. I'm not sure how this effect aligns with the unwanted braking, as that is not happening when using pure throttle only. Thirdly, the rpms read 0 when riding.
Can you suggest where to start looking for the problem? I suspect the faulty temperature sensing is a good clue, but I don't understand the electronics well enough to follow from there. Ground wire to the motor? Is there somewhere I can look up what resistances I should read between pins on the motor connector?
Thanks for your time!
I have noticed three coincident issues. The motor temperature readout on the CA3 reads below zero when the motor is at ambient temps (+18 today). If I unplug the motor connector it reads -25/26. This issue seems to match up with the braking problem, ie. they are both intermittent and come on/off roughly together. Secondly, the throttle will power the bike on the first use of the throttle after turning on the battery switch, but once released will not provide power on subsequent attempts until the battery switch is cycled again. I'm not sure how this effect aligns with the unwanted braking, as that is not happening when using pure throttle only. Thirdly, the rpms read 0 when riding.
Can you suggest where to start looking for the problem? I suspect the faulty temperature sensing is a good clue, but I don't understand the electronics well enough to follow from there. Ground wire to the motor? Is there somewhere I can look up what resistances I should read between pins on the motor connector?
Thanks for your time!
