ZK-MG PWM DC Motor Speed Controller – Precise, Digital & Easy to Use

Take full control of your DC motor projects with this ZK-MG PWM Motor Speed Controller. Designed for hobbyists, engineers, and makers alike, this compact unit supports DC 5V–30V input (compatible with 12V and 24V systems) and handles a rated current of 5A continuous, up to 15A peak — perfect for a wide range of DC motor applications including fans, pumps, conveyors, and automation systems.

The built-in digital encoder knob delivers far greater accuracy and repeatability than a standard potentiometer, letting you dial in your exact duty cycle or frequency with confidence. A clear digital display keeps your settings visible at a glance, and all parameters are saved to memory even after power loss.

Key Features

Wide Voltage Range: DC 5V–30V input with built-in anti-reverse polarity protection
Rated 5A / Max 15A: Up to 150W maximum power output
Soft Start Function: Current ramps up gradually on motor start — no sudden current spikes, extending motor lifespan
Adjustable PWM Frequency: 1 KHz–99 KHz in 1 KHz steps (default 20 KHz, ~1% accuracy)
Full Duty Cycle Control: 0–100% in 1% steps; upper and lower duty cycle limits are independently configurable
Digital Encoder Knob: Rotate clockwise to increase duty cycle, counterclockwise to decrease — more precise than a potentiometer
Start/Stop Button: Short press to start or stop the motor; external switch control also supported via STOP port (3.3V logic or switch key)
Power-Down Memory: All set parameters are retained after power is removed
Standard 5135 Instrument Shell: ABS housing for easy panel mounting and installation
Made in Mainland China

Technical Specifications

Input Voltage	DC 5V – 30V
Rated Current	5A (Max 15A)
Maximum Power	150W
PWM Frequency	1 KHz – 99 KHz (default 20 KHz)
Duty Cycle	0% – 100% (1% step)
Material	ABS
Package	1 × ZK-MG PWM Motor Speed Controller

How to Use the Encoder Knob

Default Interface (Duty Cycle Display):

Short Press — Toggle motor start/stop
Long Press — Enter settings menu
Rotate Clockwise — Increase duty cycle
Rotate Counterclockwise — Decrease duty cycle

Settings Interface:

Short Press — Cycle through parameters: Duty Cycle Lower Limit (L__), Upper Limit (H__ / 100), Working Frequency (F__)
Long Press — Exit settings
Rotate — Increase or decrease the selected parameter value

External STOP Port: Connect an external switch or apply a 3.3V logic signal to remotely toggle the motor's start/stop state — ideal for automation and custom control setups.

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For further reading on electrical safety and standards for electronic components, visit the U.S. Consumer Product Safety Commission (CPSC).

Frequently Asked Questions

Q: What voltage range does the ZK-MG PWM motor speed controller support?

A: The ZK-MG supports a DC input voltage of 5V to 30V, making it compatible with common 12V and 24V DC motor systems used in hobby, automotive, and industrial applications.

Q: Can I control this PWM motor controller with an external switch?

A: Yes. The rear STOP port allows you to connect an external switch or 3.3V logic signal to remotely toggle the motor start/stop state, making it ideal for custom automation and control panel setups.

Q: Will the settings be saved if the power goes out?

A: Absolutely. The ZK-MG features power-down memory storage, so all your configured parameters — duty cycle limits, working frequency, and more — are retained even after the unit loses power.

Q: What is the maximum current and power this controller can handle?

A: The controller is rated at 5A continuous current with a maximum peak of 15A, and a maximum power output of 150W. For sustained high-current applications, ensure adequate heat dissipation.

Q: How does the soft start function benefit my motor?

A: The soft start gradually ramps up current when the motor is turned on, eliminating sudden current spikes that can stress motor windings and reduce lifespan — keeping your equipment running longer and more reliably.