1. Introducció
This manual provides essential information for the safe and efficient use of your NULKOMMA JH4AJ6566DZHBK Brushless DC Motor Controller. Please read this manual thoroughly before installation and operation to ensure proper function and longevity of the product.
The JH4AJ6566DZHBK is designed to provide steady speed and sensitive control for electric bicycles and scooters, managing braking and direction changes effectively. Its aluminum alloy shell ensures good heat dissipation and protects internal circuits.
2. Informació de seguretat
- Desconnecteu sempre l'alimentació abans de realitzar qualsevol instal·lació, manteniment o resolució de problemes.
- Ensure all connections are secure and correctly matched according to the labels. Incorrect wiring can cause damage to the controller or other components.
- Eviteu exposar el controlador a l'aigua o a temperatures extremes.
- Do not attempt to open or modify the controller casing, as this may void the warranty and pose safety risks.
- Si no esteu segurs sobre algun dels passos d'instal·lació, consulteu un tècnic qualificat.
3. Producte acabatview
The NULKOMMA JH4AJ6566DZHBK Brushless DC Motor Controller is a robust unit designed for reliable performance in e-bike and scooter applications. Key features include:
- Sensitive control for steady speed and responsive braking.
- Durable wires and interfaces for long-term use.
- Aluminum alloy shell for effective heat dissipation.
- Labeled interfaces for straightforward installation.


4. Especificacions
| Paràmetre | Valor |
|---|---|
| Número de model | JH4AJ6566DZHBK |
| Voltage | DC 48V |
| Corrent màxima | 21A ±1A |
| Volum baixtage Protecció | 39V ± 1V |
| Material | Aliatge d'alumini |
| Pes de l'article | 286 grams (aproximadament 10.1 unces) |
| Dimensions del paquet | 9.45 x 5.91 x 1.57 polzades |
5. Configuració i instal·lació
The controller features labeled interfaces for easy connection. Carefully identify each connector before plugging them in. Refer to the diagram and video below for guidance.

- Identificació de connectors: Before connecting, familiarize yourself with the various connectors extending from the controller. Each connector is typically color-coded or labeled for its specific function (e.g., motor phase wires, battery, throttle, brake, display).
- Motor Phase Wires: Connect the three thick wires (usually green, blue, yellow) from the controller to the corresponding motor phase wires.
- Connexió de la bateria: Connect the main power wires (red for positive, black for negative) to your DC 48V battery pack. Ensure correct polarity to prevent damage.
- Throttle/Accelerator: Connect the throttle cable to the designated connector.
- Palanques de fre: Connect the brake lever cables. The controller is designed to detect low-level brake signals, cutting power to the motor for safe stopping.
- Display/Panel: If applicable, connect your e-bike display or control panel to the appropriate connector.
- Altres connexions: Connect any other auxiliary components such as pedal assist sensor (PAS), lights, or speed sensor as required by your e-bike system.
- Connexions segures: Double-check all connections to ensure they are firm and properly seated. Loose connections can lead to intermittent operation or damage.
Watch the video below for a visual guide on the controller's components and connections:
Video 1: A detailed look at the NULKOMMA JH4AJ6566DZHBK Brushless Motor Controller, demonstrating its various wire harnesses and connectors for proper installation on an e-bike or scooter.
6. Instruccions de funcionament
Once the controller is correctly installed and all connections are secure:
- Encès: Turn on the main power switch of your e-bike or scooter. The display (if connected) should illuminate.
- Control de l'accelerador: Gently twist the throttle to engage the motor. The controller will provide sensitive and steady speed control.
- Frenatge: Apply the brake levers. The controller is designed to detect low-level brake signals, cutting power to the motor for safe stopping.
- Direction Changes: The controller facilitates smooth and responsive direction changes based on your input.
- Seguiment: Pay attention to any indicators on your display for battery level, speed, and error codes.
7. Manteniment
- Inspecció periòdica: Periodically check all wiring and connectors for signs of wear, corrosion, or looseness.
- Neteja: Keep the controller clean and free from dust, dirt, and moisture. Use a dry, soft cloth for cleaning. Do not use harsh chemicals or abrasive materials.
- Dissipació de calor: Ensure the controller's aluminum casing is not obstructed, allowing for proper airflow and heat dissipation.
- Evitar l'impacte: Protect the controller from physical impact or drops.
8. Solució De Problemes
Si teniu problemes amb el controlador, consulteu els problemes i solucions habituals següents:
- El motor no respon:
- Comproveu la connexió de la bateria i el nivell de càrrega.
- Verify all motor phase wires and Hall sensor wires are securely connected.
- Inspect throttle connection and functionality.
- Potència intermitent:
- Ensure all connectors are tight and free from corrosion.
- Check for any damaged or frayed wires.
- Sobreescalfament:
- Ensure the controller is mounted in a location with adequate airflow.
- Verify the motor is not drawing excessive current (e.g., due to mechanical resistance).
- Incorrect Speed/Braking:
- Check throttle and brake sensor connections.
- Ensure the controller is compatible with your motor and battery specifications.
For persistent issues, contact NULKOMMA customer support.
9. Garantia i Suport
The NULKOMMA JH4AJ6566DZHBK Brushless DC Motor Controller comes with a 1 any de garantia des de la data de compra, cobrint defectes de fabricació.
For technical support, warranty claims, or any questions regarding your product, please contact NULKOMMA customer service. Please have your model number (JH4AJ6566DZHBK) and purchase details ready when contacting support.
You can visit the official NULKOMMA store for more information: NULKOMMA Store