yk31c not working please help

[LPRO]

so i have a yk31c controller (36v 500w but im using 24v).
when i got it i wired all the important stuff for a bench test (motor wire, power, lock, throttle)
and nothing happend. I tried everything to make it work but i cant figure it out so im asking for help!

 

[BaconBitRacing]

@Functional Artist is your friend, he's the electric expert! Welcome to the forum!

 

[LPRO]

Alright thanks!

 

[Functional Artist]

Howdy &

"I have a 36V controller but, I'm using 24V"

IMO there's your problem
...so, you'll need another 12V battery, to use that controller

The Low-Voltage cut-off of most 36V controllers is ~31.5V
...this "safety" feature will shut down the power (to the motor)
...so, you can't over-discharge (& potentially damage) your battery pack

But, "if" your only using a 24V battery pack, the top charge voltage (of that pack) is probably only ~27V
...which is not enough voltage to power a 36V controller/system

Here is a listing for a 36V YK31 speed controller
* Notice the "Short Voltage" (AKA Low-Voltage Cut-Off) of 31.5V, on the label?
https://www.ebay.com/itm/1542596113...ce7VzW1FbFvpQppQQXUkqGtHYA==|tkp:BFBM1Oj8svZh

 

[Functional Artist]

Also, here is a video I made a few years ago
It's for a 24V system
...& all of the concepts are the same
...except for the Voltage requirements of the battery pack

* Notice the "Short Voltage" (in Chinese) of ~20.5V, on the 24V speed controllers label?

 

[LPRO]

alright im gonna try it thanks!

 

[LPRO]

i tested it and it worked! thanks!

though i dont have a 36v motor so is there some way to bypass the cutoff?

edit: i found how to do it (i can change R31 from 3.6K to 4.7K)

 

[Functional Artist]

i tested it and it worked! thanks!

though i dont have a 36v motor so is there some way to bypass the cutoff?

Kool & your welcome!
No, not really as it's an integrated safety feature

Well, (2 options) your gonna have to either get a 24V speed controller, to work with your 24V motor
...or get a 36V motor to work with your 36V speed controller

I'd go bigger
...but, it really depends on what you're working on
...kids kart?
...adult kart?
...other?

 

[LPRO]

made it work at 24v thanks for the help! (all i had to do was change the resistor)

 

[BaconBitRacing]

made it work at 24v thanks for the help! (all i had to do was change the resistor)

Can we see what you’re building? I always like seeing projects.

 

[LPRO]

sure! i'll send pics when done! (hopefully today)

 

[LPRO]

finished my project,
here are some pics!

the project started from a 75$ razor mx350 and i have been upgrading it afterward!

 

[BaconBitRacing]

finished my project,
here are some pics!

the project started from a 75$ razor mx350 and i have been upgrading it afterward!

Thanks man, how does it drive? Good starter price.

 

[LPRO]

top speed is 15mph, stock is 12mph.

 

[BrownStainRacing]

top speed is 15mph, stock is 12mph.

I'd call that an improvement!!!!

Every little bit counts.

 

[LPRO]

thanks!

 

[BaconBitRacing]

thanks!

Maybe 36V when ya upgrade. Nice improvement, how much did it cost?

 

[LPRO]

the whole project cost about 200$ but the controller cost 20.

 

[LPRO]

took it for a test drive and found a new problem...

it stutters when under load, and i think the reason is some other resistors are connected to the one i changed.
and when i change one the others might get offset too.

heres a schematic (i changed R31)