Using the IoT Port on PwnCNC Spindle Systems

Automatic Control of Dust Collection and Accessories

PwnCNC spindle systems include an IoT control port on the VFD enclosure that allows the spindle system to automatically control external accessories such as a shop vac or coolant pump.

This feature is designed to simplify CNC operation by reducing the number of manual switches required when starting and stopping a job.

How It Works

We use an IoT power control solution from Digital Loggers, which integrates cleanly with our spindle systems.

Each PwnCNC spindle system includes:

An IoT control plug
A low-voltage 2-conductor signal connection exposed from the VFD enclosure

By connecting this signal wire between the VFD enclosure and the Digital Loggers IoT Power Strip, the spindle system can automatically switch an outlet on or off based on spindle activity.

Automatic Shop Vac Control

The most common use case is dust collection.

The IoT Power Strip includes an “Usually Off” outlet
Your shop vac is plugged into this outlet
When the spindle ramps above approximately 5500 RPM, the VFD outputs the control signal
The IoT Power Strip activates the outlet, turning the shop vac on
When the spindle slows down or stops, the outlet turns off automatically

This happens without any CNC software configuration. It is handled entirely by the spindle system and VFD.

Electrical Limits and Compatibility

There are a few important limitations to be aware of:

The IoT Power Strip can control multiple AC loads up to 12 amps total
This is sufficient for most shop vacs
Larger dust collectors that draw high startup current may exceed this limit and are not recommended

Voltage Limitations

The Digital Loggers unit used here operates on 12–120VAC
This makes it suitable primarily for use in the United States
At this time, a 220V version is not available

Other Supported Uses

In addition to dust collection, customers often use this feature to control:

Spindle coolant pumps
Auxiliary fans or small accessories

If you use the IoT port to control a coolant pump, we strongly recommend adding a third-party flow indicator. This provides a visual confirmation that coolant is flowing when CNC operations begin.

What This Feature Is Not

This is not a high-power motor starter
It is not designed for large dust collectors
It does not replace proper electrical safety devices
It does not provide feedback to the CNC controller

It is intended as a convenience automation feature, not an industrial control system.

Technical Reference

We’ve attached the Digital Loggers technical datasheet to this article for customers who want deeper electrical and signaling details.

Final Notes

The IoT port is one of those “quality of life” features that many customers end up loving once it’s installed. It reduces steps, improves workflow, and helps keep CNC operation consistent from job to job.

If you’re unsure whether your accessory is compatible with this setup, feel free to contact support before connecting it.

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If you have additional questions, please reach out to us at [email protected]