Promax SD003 1K Digital Display Potentiometer - Panel Mount Speed Controller

Specifications

• Model Designation: SD003-DVR

• Equivalent Resistance: 1K Ohm (Linear)

• Display Power Supply (Pins 4/5): 6V to 30V DC

• Display Type: 4-Digit Red LED 7-Segment

• Mounting Type: Panel Mount (Snap-in retention clips)

• Terminal Interface: 5-Pin Screw Terminal Block

• Knob Material: Knurled Aluminum Alloy

• Internal Calibration: Yes (via rear A/B tactile buttons)

• Enclosure Material: Gray ABS Plastic

Downloads:

• Promax SD003 Digital Display Potentiometer_Datasheet
• Promax SD003 Digital Display Potentiometer_User Manual

Key Applications and Projects

• Lathe and Mill Spindle Control: Replacing the stock analog dial on a mini-lathe to achieve highly repeatable turning speeds for different metals.

• VFD Remote Panels: Building a remote control box for an air compressor or dust collector stationed across the workshop.

• Conveyor Belt Calibration: Ensuring a manufacturing assembly line runs at the exact same speed during every shift.

Unlock New Capabilities (Project Evolution) The Precision Pottery Wheel: Are you building a custom DIY pottery wheel using a salvaged treadmill motor and a cheap PWM controller? Dialing in the perfect speed with clay-covered hands on a standard plastic knob is frustrating and inaccurate. Evolve your build! Wire this SD003 module into your controller enclosure. The knurled aluminum knob is easy to grip even when messy, and the bright digital display allows you to memorize the exact numerical speeds required for centering, pulling, and trimming your clay. You have just upgraded a scrap-yard build into a professional-grade ceramic studio tool!

PACKAGE INCLUDED

• 1 x Promax SD003 1K Digital Display Potentiometer Module

FREQUENTLY ASKED QUESTIONS (FAQ)

1. What does this module actually do? It physically replaces a standard mechanical 1K Ohm rotary potentiometer. It provides the same control signal to your motor driver, but adds a bright digital display so you can see exactly where your dial is set.

2. Can I use this to power a motor directly? Absolutely not. This is a low-power control signal device. It must be connected to a dedicated motor driver, VFD, or PWM controller. Connecting motor power directly to this module will instantly destroy it.

3. What is the equivalent resistance value? This specific module is calibrated to simulate a 1K Ohm potentiometer.

4. Can I use this to replace a 10K Ohm potentiometer? Generally, no. You should match the resistance value recommended by your motor controller's manual. Using a 1K pot on a circuit designed for 10K can draw excess signal current or drastically alter the control curve.

5. What are the 5 pins on the back for?

• Pins 1, 2, and 3: These correspond to the ends and the center wiper of the 1K potentiometer. They connect to your motor controller.

• Pins 4 and 5: These are the positive (+) and negative (-) power inputs to turn on the red LED display.

6. What voltage is required to turn on the display? Pins 4 and 5 require a Direct Current (DC) power source between 6V and 30V.

7. Can I power the display with AC voltage? No. Supplying Alternating Current (AC) to Pins 4 and 5 will destroy the internal electronics.

8. Does the digital display show my actual motor RPM? No. It displays a scaled numerical value (usually 0 to 100 percentage) corresponding to the position of the knob. It does not possess a tachometer sensor to measure the physical spinning speed of the motor.

9. What do the small "A" and "B" buttons on the back circuit board do? These tactile buttons are used to enter the module's internal menu to calibrate the display scaling (e.g., changing the maximum displayed number from 100 to a custom value) and adjust the responsiveness of the encoder.

10. How do I mount this into a control panel? It is designed for snap-in panel mounting. You cut a rectangular hole in your metal or plastic enclosure, slide the module in from the front, and the plastic side clips will snap outward to lock it in place.

11. Does the module remember its setting when I turn the power off? Yes, the internal digital logic retains the last set value in its memory when power is removed, so it will start up at the exact same setting when you turn the machine back on.

12. Is the rotary knob continuous, or does it have hard stops? It utilizes an endless rotary encoder. Unlike an analog pot that stops at 0 and 270 degrees, this knob spins continuously in both directions.

13. What kind of wire should I use for the screw terminals? Standard 22AWG to 18AWG stranded copper wire is ideal for securing into the green terminal block.

14. Can I use this to dim LEDs directly? No. Just like with motors, this cannot handle high power. You must connect it to the control pins of a high-power LED dimming module or constant current driver.

15. Can I use this for audio volume control? It is not recommended. Audio equipment requires a logarithmic taper potentiometer to match human hearing. This module provides a strict linear output intended for industrial machinery.

16. Is the display visible in bright workshop lighting? Yes, the 7-segment red LED display is extremely bright and provides excellent contrast, making it easy to read from across the room even in well-lit environments.

17. Why is my VFD showing an error when I connect this? Verify your wiring. Ensure Pins 1, 2, and 3 are correctly matched to the VFD's 10V Reference, Analog Input, and Ground pins. Incorrectly wiring the wiper (Pin 2) to a high voltage can cause controller faults.

18. Does this module output a PWM signal? No. It outputs an analog resistance/voltage signal. It is meant to be plugged into a module that generates PWM.

19. Is the aluminum knob removable? Yes, it is typically secured to the encoder shaft via a small set screw on the side or by a tight friction fit, allowing you to swap it for a different style of knob if desired.

20. Is this module waterproof? No. The front face provides basic dust resistance, but it is not IP-rated against liquids. It should be mounted in a dry environment and protected from cutting fluids and coolants.