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E-Bike Throtle and Power Cut-off issues.

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E-Bike Throtle and Power Cut-off issues.

Old 04-12-17, 11:35 PM
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la1exotic
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E-Bike Throtle and Power Cut-off issues.

So I bought an e-bike recently. And right off the bat I'm having some issues with the throttle. After charging the bike the initial experience of ridding it is great, the bike works like it should and I find myself enjoying the ride. Not too long after I start ridding I notice I'm at a four-way stop sign intersection. Once I gave come to a complete stop I give it some throttle and the bike doesn't move, I throttle up again same thing and again finally it works. I come to another complete stop throttle up again same thing doesn't move it doesn't take long for me to realize that I have to roll the bike forward and throttle up then for it to work. What could be causing this ?
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Old 04-13-17, 02:05 AM
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We need to know what system you're using to attempt a diagnosis. Based on not knowing anything, I suspect you simply have a low power kit that doesn't have enough juice to take off without a little pedal power. My first ebike I bought used was like that.
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Old 04-13-17, 03:20 AM
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Some throttle systems require a minimum amount of wheel (or crank) rotation to operate for safety reasons.
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Old 04-13-17, 10:55 AM
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Originally Posted by BobG View Post
Some throttle systems require a minimum amount of wheel (or crank) rotation to operate for safety reasons.
I have found this to be the case with mine. on a stand it will start turning once I turn the throttle; however, whenever I am riding it, if I just turn the throttle it makes a "grunk" sound and does nothing. I have to start the moving, then it can pick up.

On my bike with a PAS, I have to do about a half turn before the motor kicks in.
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Old 04-13-17, 11:09 AM
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If you want good answers instead of guesses, you HAVE TO WRITE what bike you have.

So far I cant decide if you have a bike that was built sloppily, or a cheap Chinese bike that works erratically.

So far I would agree your observations are from faults on the bike though and not having too high an expectation.

-SP
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Old 04-13-17, 02:22 PM
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Need to know the bike and motor system... Are you still holding the brake lever when you try to start pedaling? Most brake levers cut power.
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Old 04-13-17, 02:56 PM
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Some motor controllers without sensors do this too. They won't reliably start a motor unless there is a little wheel movement. Not for safety, but due to limitations in running without sensors.
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Old 04-13-17, 05:07 PM
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I checked my BionX owners manual on this issue. My motor will not operate if the rear wheel is turning less than 3 kmh. If motor is shut down the throttle is also shut down. As others above have suggested, check the specifics of your system. Your owner's manual or shop you bought it from would be good starting points.

Last edited by BobG; 04-13-17 at 05:21 PM.
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Old 04-14-17, 03:57 PM
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Well ok then. We have no info on the bike, and apparently the OP lost interest. Super!
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Old 04-19-17, 10:23 AM
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Happy Easter

Sorry guys I have been away for Easter and had no access to Internet. Thank you for all your replies so far as far as the bike goes it's got a 1500 W motor and a 60 V battery the bike works just fine for the first 15-20 minutes I can stop and go no problem and then after a while It'll start doing that I don't think I'm low on juice since I haven't ridden long enough to run it down. Also it's not just a matter of rolling it forward like half a turn I have to have a rolling start for it to keep going which on the bike that weighs 120 pounds and it's meant for two people it's extremely unsafe .
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Old 04-19-17, 04:18 PM
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Sorry

Originally Posted by Joe Remi View Post
Well ok then. We have no info on the bike, and apparently the OP lost interest. Super!
Sorry guys I have been away for Easter and had no access to Internet. Thank you for all your replies so far as far as the bike goes it's got a 1500 W motor and a 60 V battery the bike works just fine for the first 15-20 minutes I can stop and go no problem and then after a while It'll start doing that I don't think I'm low on juice since I haven't ridden long enough to run it down. Also it's not just a matter of rolling it forward like half a turn I have to have a rolling start for it to keep going which on the bike that weighs 120 pounds and it's meant for two people it's extremely unsafe .
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Old 04-19-17, 04:22 PM
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Model

My e-bike is more like an e-scooter. A company Called jmiles sells it. It's the fat tire scooter.
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Old 04-19-17, 04:23 PM
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Originally Posted by NoPhart View Post
Need to know the bike and motor system... Are you still holding the brake lever when you try to start pedaling? Most brake levers cut power.
No I'm not there is sensors on the brakes and if I do that obviously the motor doesn't work at all however I disconnected the brakes just to be sure they were not faulty and it still started doing it after a certain amount of time
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Old 04-19-17, 04:25 PM
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Originally Posted by BobG View Post
Some throttle systems require a minimum amount of wheel (or crank) rotation to operate for safety reasons.
I imagine if that was the case then it shouldn't work at all from the get-go but this one actually works for about 15-20 minutes just fine after a while then it starts doing that
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Old 04-19-17, 04:26 PM
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Originally Posted by speedy25 View Post
If you want good answers instead of guesses, you HAVE TO WRITE what bike you have.

So far I cant decide if you have a bike that was built sloppily, or a cheap Chinese bike that works erratically.

So far I would agree your observations are from faults on the bike though and not having too high an expectation.

-SP
It's definitely a cheap Chinese bike sort of cheap $1200 and I included some details about where came from below
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Old 04-19-17, 04:27 PM
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Originally Posted by NoPhart View Post
Need to know the bike and motor system... Are you still holding the brake lever when you try to start pedaling? Most brake levers cut power.
It's more of a scooter so it doesn't actually have pedals
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Old 04-19-17, 04:28 PM
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Originally Posted by Doc_Wui View Post
Some motor controllers without sensors do this too. They won't reliably start a motor unless there is a little wheel movement. Not for safety, but due to limitations in running without sensors.
What is the sensor you're referring to?
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Old 04-19-17, 04:58 PM
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Originally Posted by la1exotic View Post
Sorry guys I have been away for Easter and had no access to Internet. Thank you for all your replies so far as far as the bike goes it's got a 1500 W motor and a 60 V battery the bike works just fine for the first 15-20 minutes I can stop and go no problem and then after a while It'll start doing that I don't think I'm low on juice since I haven't ridden long enough to run it down. Also it's not just a matter of rolling it forward like half a turn I have to have a rolling start for it to keep going which on the bike that weighs 120 pounds and it's meant for two people it's extremely unsafe .
1500W with 60V battery, 120lbs. and works fine for the first 15-20 minutes. I suspect your battery voltage is at or below the controller voltage cutoff. That's my first thought anyway...
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Old 04-19-17, 06:18 PM
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Originally Posted by la1exotic View Post
It's more of a scooter so it doesn't actually have pedals
No pedals... Sorry, I just can't help it,
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Old 04-19-17, 07:47 PM
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Originally Posted by NoPhart View Post
1500W with 60V battery, 120lbs. and works fine for the first 15-20 minutes. I suspect your battery voltage is at or below the controller voltage cutoff. That's my first thought anyway...
Is it possibly a faulty controller so by changing it it would correct the issue also how can I check if the controller is lower voltage or not ?
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Old 04-19-17, 07:48 PM
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Originally Posted by 350htrr View Post
No pedals... Sorry, I just can't help it,
I know I know but it's not as bad as you think .
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Old 04-19-17, 07:59 PM
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Originally Posted by la1exotic View Post
I know I know but it's not as bad as you think .
Yes, and, That is what everyone here, is telling me, ALL the time...

Last edited by 350htrr; 04-19-17 at 08:09 PM. Reason: spelling
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Old 04-19-17, 08:17 PM
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Interesting ride. Full description is here.


So what happens is after 20 minutes of riding, the bike won't start from a stop. It might run after you get it rolling, but you probably don't have much power?

Is the battery still under their 12 month warranty? It's most likely the battery. The symptoms say bad battery.

When a battery is bad, its starts to "sag", which means it puts out less voltage under heavy load. In your case, heavy load is when you start from a stop. So pushing it gets the scooter rolling and the battery has enough power to keep you going.

Does the bike have LED's that display battery health? What are they doing when this happens?

For diagnostics, someone would clamp a voltmeter on the battery and watch the volatge when thios happens. If it drops a lot from 60 volts, that's indicative of a bad battery.

Now please don't tell us that after you get home, the scooter runs fine the next day, which would cancel the above.



.

Last edited by Doc_Wui; 04-19-17 at 08:21 PM.
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Old 04-20-17, 10:09 AM
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Originally Posted by Doc_Wui View Post
Now please don't tell us that after you get home, the scooter runs fine the next day, which would cancel the above.
If so, then it might be a heat issue (?), but it is likely your battery has low voltage like Doc_Wui says. Changing the controller or controller settings isn't the solution. The controller that came with this scooter is part of the complete design that all functions together. 99% sure you are low on juice after 15-20 minutes of use, be it battery drain or bad battery...
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Old 04-20-17, 04:58 PM
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Originally Posted by Doc_Wui View Post
Interesting ride. Full description is here.


So what happens is after 20 minutes of riding, the bike won't start from a stop. It might run after you get it rolling, but you probably don't have much power?

Is the battery still under their 12 month warranty? It's most likely the battery. The symptoms say bad battery.

When a battery is bad, its starts to "sag", which means it puts out less voltage under heavy load. In your case, heavy load is when you start from a stop. So pushing it gets the scooter rolling and the battery has enough power to keep you going.

Does the bike have LED's that display battery health? What are they doing when this happens?

For diagnostics, someone would clamp a voltmeter on the battery and watch the volatge when thios happens. If it drops a lot from 60 volts, that's indicative of a bad battery.

Now please don't tell us that after you get home, the scooter runs fine the next day, which would cancel the above.



.
That's really interesting it does have a meter of sorts I'm not sure if it's volts or not since when the battery is fully charged it shows 66.6 I'm assuming that's volts. That number will drop the further I ride it. if I'm going uphill and I need more juice the number drops low by probably about four let's say volts when I'm going on a downhill that number drops less depending on how much I'm pushing the throttle when I stop it stabilizes to a certain number depending on how long I've ridden it.
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