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CNC Speed Control

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Roze:
Hi,
I recently bought a Spindle motor with speed controller from china, link below. And now my plan is to replace the supplied pot with some logic to be able to set speed from G-Code.

Non the less, do anyone have experience with similar speed controllers? If so, is it a voltage or current controlled input? Or is it some other form of control, like 555 based where replacing the pot is far harder?

If it is voltage controlled, I was thinking of using a LTC2644 as a bridge from the supplied PWM to a voltage level.

Any info is appreciated.

//Kind regards.

Link to Controller: https://www.banggood.com/Machifit-AC-110-220V-Power-Supply-Speed-Governor-For-ER11-Chuck-CNC-500W-Spindle-Motor-p-1160828.html?rmmds=search&cur_warehouse=CN

ThomasDK:
From one of the reviews:


--- Quote ---Very carefully!
It is not galvanically isolated. The potentiometer wires are also galvanically connected to the mains. You have to solve the touch protection! Install a FI relay! There is nothing to limit the switch-on current. Appropriate NTC installation is recommended! No noise protection. It is necessary to install an appropriate suction guard! It can be used after replacing the deficiencies.
--- End quote ---

With the potentiometer at mains potential, it is not just a matter of throwing in a DAC.

Note that another version of the controller exists with a 0-10V input for speed control:

Roze:
Thank you for that note, I shall order the proper one then!

 :)

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