Tiny Controls · Own design
PWM to 0-10V (TSR1)
Isolated PWM to 0-10 V converter with adjustable output and two on-board relays, for spindle speed control.
Overview
Most CNC controllers set spindle speed with a PWM signal. Most VFDs expect an analogue 0-10 V. The TSR1 sits between them and converts one to the other.
Input and output are isolated from each other, which is the part that matters. A VFD is a switching power converter sharing a panel with the controller, and tying their grounds together is a reliable way to inject noise into the control system — or worse, to put drive-side potential onto a controller input. Isolation removes that path.
The 0-10 V output is adjustable, so the top of the range can be trimmed to the VFD's actual full-speed input rather than assuming exactly 10 V. The converter works across a range of PWM frequencies, so it does not have to be matched to one particular controller.
Two relays on the board handle the switched signals a spindle needs alongside the speed reference — typically run enable and direction.
Designed and built by Tiny Controls in India.
Specifications
| Board Power Supply | 5 V DC |
|---|---|
| Isolated Analog Power Supply | 10 V DC |
| Relays | 2 On Board |
| Input | PWM & RELAY2 |
Downloads
Questions
What do I use this for?
Spindle speed control. Your controller outputs PWM; your VFD wants 0-10 V. This converts between them, isolated, so the two systems do not share a ground.
Which PWM frequency does it need?
It works across a range rather than one fixed frequency. The exact limits are not stated in our record — tell us your controller and we will confirm.
What are the two relays for?
The switched signals a spindle needs alongside speed — typically run enable and direction. Contact ratings are not in our record, so ask if you are switching anything substantial.
Why does isolation matter here?
A VFD is a switching converter in the same panel as your controller. Sharing a ground between them is a common source of noise and false triggering; isolation removes that path.