Motor going both forward and reverse with KT controller

brhooma · Jan 22, 2020

Hi,

I bought a KT36ZWSRTD to replace a controller on a foldable Chinese bike (Fiido D3).
The motor spins forward on low speeds (no display so I can't tell what speed) and then spins in reverse when I twist the throttle a bit more. Do I have a faulty controller or am I doing something wrong?. Any help would be appreciated.

amberwolf · Jan 22, 2020

that sounds as if the throttle is perhaps hooked up to the wrong connector.

perhaps the one it's hooked up to is actually a forward/reverse connector that responds to voltages above about 2.5v by reversing the rotation?

brhooma · Jan 22, 2020

there are only two connectors with three wires, throttle and pas.

amberwolf · Jan 22, 2020

then i don't know; iv'e never seen a controller that could behave that way using either the throttle or the pas connector.

amberwolf · Jan 22, 2020

the only other thing i can imagine is if the phase / hall wires are not in the correct order. i have never actually seen rotation direction change from this, and don't see how it could happen, but there's nothing else that could be caused solely by amount of throttle and change rotation direction, either.

hall/phase wires don't always (usually don't) match color for color, so you may have to experiment with the order to get both the right direction and correct operation (including low no-load / offground power usage).

AHicks · Jan 23, 2020

I don't mean to seem smug here, but I think a call to the people that supplied the controller might be in order, or possibly, to KT themselves? Ask them for their opinion. Suddenly reversing mid throttle like that is pretty crazy.....

brhooma · Jan 23, 2020

amberwolf said:
hall/phase wires don't always (usually don't) match color for color, so you may have to experiment with the order to get both the right direction and correct operation (including low no-load / offground power usage).

Thanks for the advice, I did that and manage to get the wheel to spin in the right direction but now it makes loud noise when accelerating, I guess I need to experiment with the order more.

AHicks said:
I don't mean to seem smug here, but I think a call to the people that supplied the controller might be in order, or possibly, to KT themselves? Ask them for their opinion. Suddenly reversing mid throttle like that is pretty crazy.....

I did get in touch with seller and they kept insisting that my motor is faulty even after I showed them the motor working perfectly fine with a different controller and their solution was to send the controller back to China to get a partial refund.

E-HP · Jan 23, 2020

brhooma said:
Thanks for the advice, I did that and manage to get the wheel to spin in the right direction but now it makes loud noise when accelerating, I guess I need to experiment with the order more.

Possibly this diagram posted by TommyCat would be of assistance:
https://endless-sphere.com/forums/viewtopic.php?f=2&t=103373&p=1512036#p1512036

docw009 · Jan 23, 2020

Controller is advertised by one ebay seller with an optional dual mode that allows it to work with sensorless or sensored motors. Switches to sensorless if sensors aren't working. Sounds scary to me. That should be a option set by user, not the controller.

The above is the only scenario I could see for a unit to change direction.

By the way, it must be a direct drive motor if you can see it change direction.

amberwolf · Jan 23, 2020

docw009 said:
Controller is advertised by one ebay seller with an optional dual mode that allows it to work with sensorless or sensored motors. Switches to sensorless if sensors aren't working.
<snip>
The above is the only scenario I could see for a unit to change direction.

this does not happen on the grinfineons that do this (autoswitch to sensorless when sensors fail). they continue to operate in the correct direction as before.

brhooma · Feb 4, 2020

Tried all the combinations. Motor either stuck, spisn in the right direction but makes noise or silent but goes both forward and reverse. I guess I'm just going to run it without connecting the hall sensor for now while I find a solution.

Motor going both forward and reverse with KT controller

brhooma

1 mW

amberwolf

Administrator

brhooma

1 mW

amberwolf

Administrator

amberwolf

Administrator

AHicks

10 kW

brhooma

1 mW

E-HP

10 GW

docw009

1 MW

amberwolf

Administrator

brhooma

1 mW

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