24V/36V YIYUN YK31C Controller for brush motor review and manual

Maybe it also happened that the control unit YK31C on an electric bicycle or a four-wheeler or electric scooter.In this article I will describe a relatively good substitution for the old control unit, you will learn the pros and cons, there is also a good manual to connect the circuits to the control unit

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Review Pros and Cons
Detailed description of brush ebike controller YIYUN YK31C
Schematic manual
Technical parameters of brush controller
Buy in shop

Where to buy

Review with Pros and Cons

Now I am describing my experience with the YIYUN YK31C Speed controller for brush motor, I tested about 12 pieces of this product and all worked OK.  Read the pros and cons of this product:

YK31C dc brush motor controller
YK31C dc brush motor controller

Pros:

  • A small box, will fit almost everywhere
  • It has battery protection, and if the voltage drops, the control unit switches off
  • Compatible with parts for electric bicycles  36V/48V batteries,brakes,throttle and meters.
  • s costly about 10-17 $  even with shipping

Cons:

  • It’s not completely waterproof (little water does not matter eg rain).
  • In the case of a long-term very high load, it can burn down,(the control unit is small and the heat has no place to escape)

 

Review conclusion:

It is a good device  with a good price.You pay from 10-17 usd (even with shipping) and you will get a stable device with good performace and with basic funtions.

For long-term high current consumption, the control unit needs to be cooled (Such as a long hill climb).

  • My rating is positive before writing reviews I tried about 12 pieces of  YIYUN YK31C.

The best use this 24V/36V YIYUN YK31C  is for  brush motor this include e-bike,mini elektrobike,electric  cart ,e-scooters and and so on.

Detailed description of brush ebike controller YIYUN YK31C

YIYUN YK31C controller can buy in diferent voltage and watage variation i seek this version in table:

24V 36V 48V
250-350W 250W-350W 250W-350W
500W 500W 500W
800W 800W

  • It ranges from the version of how much current it can bring eg. 24V 350W má maximum current about 25A
  • The controller is stored in the aluminum cover,and secured by cross screws.
  • Cable wires with connectors are about 15cm long
  • On the top of the cover there is a description of the wiring but it is Chinese so I will show below how to correctly connect the control unit
  • Supports the Hall sensor three-wire control throttle
  • In YK31C is used CNX-50 for motor or battery and CNX-54 for throttle , other connector is CNX-54 its good explained on this page
  • The controller has an integrated battery protection, for example, when the 24V system is switched off at 20.5V at 36V it is 31.5V and at 48V jet approx. 43.5V

Here is manual for YIYUN YK31C Controller  how  to properly plug the connectors

  • Battery :Thick Black (Power Negative) /Thick Red (Power Positive)
  • Motor :Thick Yellow (Motor Negative) /Thick Blue (Motor Positive)
  • Ignition Switch :Thin Red(VCC)/Thin Blue
  • Indicator : Thin red (Indicator power output) /thin black (indicator negative)
  • Brake: Thin yellow (Brake signal)/thin black(Negative Power)
  • Speed governor : Thin blue(Speed handlebar Signal input) /Thin black (Negtive Power) /thin red(5V Positive Power)
  • Charge Port: Thin red (charge input power Positive) /thin black (Power negative)
  • Brake Light: Thin red (power Positive) /thin black (Power negative)
  • Most often works with SLA lead batteries but can also be li-ion or li-po, lifepo4.

 

Here can  download manual with wirring controller manual for YIYUN YK31C Controller

YK31C diagram

  • An important note when connecting the throttle must be good wires !! Otherwise an electric scooter will not work

On schematic is called “speed governor” is connector for thortle Well see how the wires are arranged

  • First is blue signal wire (Also often marked green)
  • Second is black (- 5V negative )
  • The third one is red (+5V positve)

But on the throttle the most common electrical wires are connected as follows

  • First  is black (- 5V negative )
  • Second is  is blue signal wire (Also often marked green)
  • The third one is red (+5V positve)

Connect the wires to black, red to red, and color to color – You have to reassemble the wires from the connector again.

Technical parameters of brush controller

 

  • Voltage:  24Volts or 36v or 48V
  • Rated power:  250-800 watts
  • Match Motor: depend on the power version of the control unit (24,36,48, can be 250W,350W,500W,800W)
  • Current Limit:28A+-1AShort Voltage
  • Protection:20V+-0.5V (for 24V)
  • Brake handle: mechanical normally open
  • Speed Regulator 1-4 V(Throttle )
  • Size 102x65x38mm

 

If you have any questions, write them in the comments

41 thoughts on “24V/36V YIYUN YK31C Controller for brush motor review and manual”

  1. Good work you did translating meaning of the Chinese words.
    Can you explain what is meant by “Brake” only.
    Brake light I understand but Brake is for what intent please.
    Thank you for your time,
    Timothy

    1. Thank to good question
      Brake = Two wires from the brake sensor

      The brake sensor is the most common micro switch in the brake that interrupts the circuit when braking

      When braking, the control unit disconnects the electric motor

      1. Hello

        Brake handle: mechanical normally open….Does it mean that we have to jumper it to get working the motor?

        Thank you very much.

  2. I’m curious about the Charge Port connection. Does this mean it has a charger built in and I simply need to put 120V to that? or does it mean I need a Charger and then just use those wires as the Battery connection from the charger? I’m assuming its the second option but I thought I’d check.

    Also I wanted to be able to limit the speed so a small child can ride it, but then crank it up when dad or big brother wants to take it for a rip (electric go kart) I’m assuming a potentiometer in line after the throttle should work for that. I realise it will only limit the power not the top speed (rpm) but hopefully it will work out well enough.

    Oh and I got 48v version, and I’m hoping to wire in a wireless kill switch, is the Ignition connector also 48v or will it be 12v? This effects the switch I get. Could also cause an issue with the main ignition switch I’m realising immediately after ordering…

    Thanks for your help

    1. Good day …on charger port is 48V (if you have 48V yiyun controller) do not connect 110V connection is direct to battery ,, do not put 110v to battery …

      Cann you add potetiometer to green signal wire.

      I not measurerd voltage on Ingnition connector,I have to verify it, I will do a video with the control unit measuring the voltage. Maybe there is only 5V

  3. Just bought the same product, but its not working, the motor runs as soon as I connect the clips. Speed adjust and brakes do nothing. Any helpful ideas?

  4. It seems like this module is come with battery charger unit. Wonder if this could be used for all battery types..Sealed acid, LI ion, Ni metal hydride… This for sharing

  5. I bought your product 36V 1000W. Why you don’t specify on the controler very important parameter – amperes (10A, 15A, 20A……..)??????????. Without this parameter the motor will burn down. CORRECT THIS ERROR!!!!!!!!!!!!!! I saw your roller on 8 demountable controler. Where to find the reference to your controler 36V 1000W, there 10 sockets.

  6. Have you seen the yiyun controller going full voltage to motor with no input from the throttle before?

    The first time: Been riding the razor for two days and today all of a sudden it went full voltage to motor as soon as i turned it on. Had to pull a cable off a battery to get it to stop. to troubleshoot I unhooked everything but the motor and batteries and it still goes full throttle. I pulled the controller apart and there is no black/fried spots or smells. ❓

    Second time with a new controller
    Rode the gokart for the two days probably over 1 hour on it. Today I plugged it in to charge and as soon as I plugged it in, it went full throttle again.. Doesn’t matter if everything else is unplugged she still goes.. Wondering if it could be my power switch or possibly something else?

    500w unite motor
    36v 10ah batteries
    12ga wiring

    1. Hi CK,

      these SPD’s are designed for long term use. you can use them for 30 – 45 min and let it cool down.
      Try to replace the MOSFETs (check which one is not functional) an dtry again.

      good Luck.

      Martin

  7. I wonder, I read here that the brakewires, if disconnected, stop the motor. Does Thie mean that I have to Connect them to drive? I have no brake handles with switches so I just shortcuts the two brake wires?
    Thanks for replying

  8. Hi I m Hanumanth, when I m connecting the battery power to controller the motor running directly at full throttle speed with out giving acceleration….
    Can you please suggest me what I should do…

  9. Attachment

    I would not use this for anything more than a 350w motor at 24v. There is very little difference between the36v and the 48v version. Slightly bigger capacitors and slightly better spec MOSFETs. I will attach a picture of my current unite 800w scooter controller next to the two versions of the yk31s. 5 x low spec MOSFETs with 60v caps vs, 13x decent MOSFETs and 80v capacitors. The wire gauge is also very telling 12awg at best left vs 10awg right. The one the right cost an extra $10.

  10. i have tried to connect the wires like it is said but it does not work. Should I connected a switch to the port and turn it on so that wires will join together then the throttle will function.
    Kindly advice

  11. Hi, I bought a YK31C here in Germany, but my version has much more cable than the Picture above and (maybe all) websites show.

    Do you know a different version of YK31C?

    On my Version there are 3 Wirepairs labeled with brake, 4x red/blak are unlabled, there is a red/blue/yellow/black one unlabled and a blue/red (with fuse) unlabled, than a single yellow, single blue – and two lon thing black, one grey and one brwon cable.

    The label on the device shows it is the YK31C DC36V, 800W, 1-4V.

    Regards from Germany
    Sven

  12. Hi i have an electric quad and its was all running fine all of sudden it stop working i took it apart and found it all runs on a yiyin yk31c bushless motor and i have power comeing out of everthing but asa i twist the throttle the motor dosent do nothink….so check motor on battery and works fine so brought new throttle and tryed that and still dosent work just can any one help

  13. Hi sir i want to know about brake light connection.
    Can i connect this to a simple led which nornallyworks on 3v such leds can i use to this brake light connector…my controller is of 24v…
    And also sir how can we assure that the battery is fully charged…my charger is of 24v 1.8A…

  14. Hello, can you help me? I have a 24v 250w controller and when i connect the battery the protection fuse burn out.
    it’s like there is a short circuit inside the controller.
    I’m conecting the battery after all other connections.
    Can you tell me what can be wrong?
    Thank you!

  15. I have the 24v 500w YK21c did not connect all wires but scooter works . Problem is no reverse,I checked throttle wires have +5 on red but I don’t have -5 on black , blue only has +5 when push forward button . I’m guessing I don’t have something connected.
    Please advise

  16. I have just fitted one of these (36v 800W version) to an old powabyke & it seems fine. I only did it to get rid of the annoying soft (delayed) start on the original. Although this is an old powabyke it must be a later version as the others had a throttle that stopped with the signal high but this one is the normal type. It would cause the throttle to work in reverse otherwise. If you are careful you can convert those reversed thottles by taking them apart & turning the magnets around.

  17. My 24v/350w brush controller faulty due to use over voltage how can recti
    ify and what possible major fault in ckt mosfet transistor and dual diode ok
    Where maintenance point

  18. What voltage should the charger be for the 24v version. My old charger is 30v thought that my be a little high . Should I replace with a charger that put out 24v ?

  19. Hi all,
    have you any idea how is controlled the charging process? How is indicated that the battery is charged fully?
    The charging is finished automatically?

  20. Hi Man, nice website! So I got the YK31C controller and the vgeby throttle controller. I am insure if I connected this thing proberly. may I send u some photos? with my adress?

      1. hey yes! I connected the three wires from.the throttle. there are two more.wires from the throttle blue and yellow. I dont know where to connect them. If i connect the batteries the motor immediately starts going instead of being throttle controlled. Do you have a picture of the right connections since u have the same hardware? thank you very much

  21. Attachment

    Hope you can help. Doing my own e-bike design but I get no voltage going to motor. I have tested Throttle and it works. I connected Throttle black red and blue wire to controller black, red and green wire. I am getting 24 volts to the Power Lock. Closed the connection for the Power Lock using a wire to join both leads. When I put a volt meter to the leads that go to motor, I get no voltage even though I am on full throttle. I am attaching a picture. I would really appreciate any feedback.

  22. I have the yk31c all I want to use are the 3 throttle wires do I hook them to the 3 wires from the controller that are together. I have a off/on switch on my positive batt. with a fuse, the only wires I switched are the motor wires so it will turn the motor in the direction I want it to go, iff that matters, but my throttle will not work and I have no other options that I know of, the motor will run with the restart knob, but it’s not what I want. any help would be appreciated. thank’s
    jolly

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