Product Description
If your GT-900D industrial overlock machine has inconsistent foot-pedal speed control, this Speed Controller Foot Pedal PCB Module is designed as a replacement electronic control board. It uses the SUPU Pedal Potentiostat VER:1.25 configuration to read pedal movement and provide variable speed control to the compatible direct-drive motor system.
The PCB is intended for GT-900D, GT-700D and compatible direct-drive industrial overlock machines using the specified SUPU pedal potentiostat system. The supplied board is a PCB module only, not a complete foot pedal assembly.
The competitor listing also positions the GT-900D speed controller as a replacement part for industrial overlock machines and describes its purpose as smoother, more precise speed regulation.
What This Speed Controller PCB Does
The pedal PCB converts the movement of the sewing machine foot pedal into an electronic control signal for the motor drive. This allows the operator to start at a controlled speed, increase speed progressively and reduce speed by changing pedal pressure.
A functional foot controller is important for controlled overlock sewing, especially when handling detailed sections or working at lower speeds. General SUPU foot-controller documentation likewise describes variable speed operation through pedal pressure.
Key Features
- SUPU Pedal Potentiostat VER:1.25 PCB configuration
- Integrated Hall-effect magnetic sensor for pedal position detection
- Onboard signal-processing circuitry
- Protective silicone/resin coating over critical electronic areas
- Multi-pin header connection points
- Rigid PCB mounting base with pre-drilled mounting holes
- Suitable replacement component for compatible direct-drive overlock pedal systems
- Pack of 1 piece
The PCB marking/revision is specified as VER:1.25 (2019.1.2 / 2023.2).
Machine Compatibility
| Machine Type | Compatible |
|---|---|
| GT-900D Industrial Overlock Machine | Yes |
| GT-700D Industrial Overlock Machine | Yes |
| Compatible Direct-Drive Overlock Machine using SUPU VER:1.25 pedal PCB | Yes |
| Single Needle Lock Stitch Machine | No |
| TA1 Umbrella Sewing Machine | No |
Important: Compatibility depends on the pedal electronics and motor-control system. Please compare your existing PCB marking, connector arrangement and mounting layout before ordering.
If your existing board does not match the SUPU Pedal Potentiostat VER:1.25 configuration, please verify compatibility before purchase.
Why Replace the Pedal Controller PCB?
A damaged or malfunctioning pedal sensor board can affect how the machine responds to foot pressure. Symptoms may include irregular speed response, difficulty controlling low-speed operation or an inconsistent start/stop response.
Replacing the PCB can restore the pedal’s electronic position-sensing function when the original board is faulty and the replacement matches the machine’s control system.
This is particularly useful for tailors, garment factories, overlock machine technicians and sewing-machine repair professionals maintaining direct-drive industrial equipment.
Best Use Cases
This electronic spare part is intended for industrial overlock machine speed control, rather than fabric-specific sewing.
The controller can be useful when the operator needs controlled machine speed for operations involving:
- Cotton garments
- Polyester garments
- Lightweight fabric
- Knitted materials
- General garment overlocking
- Detailed edge finishing
- Production sewing
The fabric itself does not determine PCB compatibility. The machine’s pedal and motor-control electronics do.
How To Install the PCB
- Switch off and unplug the machine before opening the pedal housing.
- Remove the existing foot-pedal cover according to the machine’s service procedure.
- Compare the old PCB with the replacement, including the PCB marking, connector arrangement and mounting holes.
- Disconnect the existing board carefully.
- Install the replacement PCB in the same orientation and mounting position.
- Reconnect the wiring and terminals exactly as required by the original configuration.
- Close the pedal housing securely.
- Power on the machine and test pedal response gradually.
Electrical installation should be performed by a qualified sewing-machine technician when you are unsure about the wiring or control-board connections.
3. FREQUENTLY ASKED QUESTIONS
Is this a complete foot pedal?
No. This listing is for one Speed Controller Foot Pedal PCB Module. It is the electronic PCB component used inside the compatible pedal assembly, not a complete pedal housing or complete foot controller.
Is this PCB compatible with the GT-900D overlock machine?
Yes. It is specified for the GT-900D industrial overlock machine and uses the SUPU Pedal Potentiostat VER:1.25 configuration. The GT-900D is also listed commercially with a dedicated speed-controller replacement board.
Can I use this PCB with GT-700D?
Yes, according to the supplied compatibility information. It is specified for GT-700D as well as GT-900D and compatible direct-drive overlock systems using the same SUPU pedal potentiostat configuration.
What does a sewing machine pedal speed-control PCB do?
It detects foot-pedal movement and converts it into an electronic control signal for the motor system. This lets the operator vary sewing speed through pedal pressure rather than simply switching the motor between on and off.
Does this PCB work with every industrial overlock machine?
No. Compatibility depends on the machine’s motor-control system, pedal electronics, connectors and PCB configuration. Check your existing board for the SUPU Pedal Potentiostat VER:1.25 marking before purchasing.
Is this suitable for a Single Needle Lock Stitch Machine?
No. This product is specified for compatible industrial overlock machines, including GT-900D and GT-700D. It should not be treated as a universal sewing-machine speed-control PCB.
