Breakout Board Speed Control

Makes sense. So I need a separate power supply for this converter? Here is the documentation for my KDIC unit. I'm still a little unsure of what the danger is. I still would like an explanation as to why my HAL file isn't working.

Logthor wrote:

So I need a separate power supply for this converter? 

If a device is not isolated from the power grid, it may cause fatal shock, damage to the electronics or its incorrect operation.
What's worse, it all depends on which wire you connect where.
The machine can operate safely and without failure for years, and when connected to another wall socket, it may burn itself or kill the operator.
To prevent this from happening, all you need to do is spend a few dollars more on an already expensive machine.
I really don't know what to discuss here...

Alright, fair enough. I've already purchased a separate supply and a PWM to analog converter. I'll just use the pot on the board to make it send out a max of 7 volts and use the basic stepconf to set up the spindle RPM.

I am doing this like I said, but I am still quite confused on how this could pose a shock hazard. It doesn't matter if the e-stop, homing switches, etc. are connected to the spindle control circuit if it is optically isolated between the KBIC and break out board. I just don't see how buying a separate supply and separate PWM to 0-10V analog unit is going to make it any safer.

Logthor wrote:

I am doing this like I said, but I am still quite confused on how this could pose a shock hazard. It doesn't matter if the e-stop, homing switches, etc. are connected to the spindle control circuit if it is optically isolated between the KBIC and break out board. I just don't see how buying a separate supply and separate PWM to 0-10V analog unit is going to make it any safer.
 

For electric current to flow, two conditions must be met - there must be a potential difference (voltage) and a closed circuit. Until you close the circuit (e.g. by touching the controller and some ground with your body at the same time) you will not be aware that there is dangerous voltage there. Current may flow, for example, from the controller terminal's power grid, through the controller input to the 0-10V board, from there to the 12V power supply, through the power supply to the homing limit switch, through the limit switch and your body to the housing of the device grounded to the other pole of the power grid. Believe me, there will be voltage and a closed circuit...

Current may flow, for example, from the controller terminal's power grid, through the controller input to the 0-10V board, from there to the 12V power supply, through the power supply to the homing limit switch, through the limit switch and your body to the housing of the device grounded to the other pole of the power grid. Believe me, there will be voltage and a closed circuit...

Yes, but there is an optocoupler between the KBIC and BoB I'm not sure where the danger is. Assuming that the optocoupler is functioning as it should mains shouldn't even reach the BoB.