Centroid Community CNC Support Forum

I am interested in integrating a restart functionality for the board so I do not need to cycle the machine when configuration changes.

I thought I could do this easily by using a normally closed time delay relay. I then can trigger the output, it will cycle the relay (open it) and then close it again, starting the board.

has anyone done this?

Not sure why it has to be this complicated. If you simply want to interrupt power to the Acorn have a simple SPST switch on your control panel with a guard on it that's locked in the "always on" position inline with the Acorn power and then cycle it when you need a restart.

This is assuming you have a master rotary switch somewhere to power up the entire system at once. Then you could just cycle the guarded switch to restart Acorn only when requested.

maybe overly complicated... but I am writing a new control UI for centriod and wanted to be able to cycle the board automatically when we make adjustments to the PLC in the UI. so, the restart would be controlled by the program.

Considering how may times and how many setups I have had to cycle the power on, I could see the benefit to this idea.

I used to do some timers that had an on time of around 10 seconds with just a relay, tip120 transistor, capacitor, and resistor. These were for a hidden switch for cops and their shotgun had a lock to keep someone from grabbing it. So they pushed the hidden sw and had 10 seconds to get the weapon out. Basically the power pulse would charge the capacitor and it would bleed off through a resistor while it held the relay on. When the voltage got low enough it dropped out.

Ken Rychlik wrote: ↑Thu Sep 04, 2025 1:00 pm
Considering how many times and how many setups I have had to cycle the power on, I could see the benefit to this idea.

....

+1

even testing beta stuff, I could not see a benefit.

A normal user will start the CNC, making parts and update maybe every year, requiring 2-3 powercycles.

Uwe