Author Topic: CNC Speed Control  (Read 1360 times)

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Offline RozeTopic starter

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CNC Speed Control
« on: March 04, 2019, 03:59:56 pm »
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
 

Offline ThomasDK

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Re: CNC Speed Control
« Reply #1 on: March 04, 2019, 05:47:25 pm »
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.

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:
 

Offline RozeTopic starter

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Re: CNC Speed Control
« Reply #2 on: March 04, 2019, 06:10:18 pm »
Thank you for that note, I shall order the proper one then!

 :)
 


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