Emergency STOP on mesa card 7i76e

Sray69 wrote:

Question: If I am running a breaker before the PSU's, should I also run fuses between the PSU's and the components? Seems a little redundant but I have read some posts where people do.

It is a nice idea if there are a lot of components powered from the same power supply, but for drives only i would not bother.
Switch mode power supplies (SMPS) have current limiting so if something goes south, it will shut down ... and power up, and shut down .... till the fault is removed, so chances of causing catastrophic failures are relatively small.

Sray69 wrote:

Well it looks like the 30mA ones are not very common on this side of the Atlantic. The standard here is 4mA-6mA from what I have found. There is mention of Equipment GFCI's that are in the 30mA range but the do not seem as easily sourced.

Any of those should do just fine, the lower the value = greater chances of saving your life, and in the 4-6mA range, even people with heart issues might get alive on the other side!

I would always recommend powering the spindle through a relay controlled by the CNC system.

Apart from anything else, it is a lot more convenient.

There are commercially available devices that can make this easy, for example: www.amazon.com/Iot-Relay-Enclosed-High-P...pberry/dp/B00WV7GMA2