7i77 5i25 PNCconf

Hi there! I m trying to configure my retrofit using pncconf. I m using the 7i77 & 5i25 kit too and have a couple of questions.

On the Motor configuration window, how do I choose the values for the PID info? I found some guides where only the P value is entered as 1.000, but in my case the pre-selected value was 50.000.

One of my motors uses a 24V powered brake. I think I need to directly wire it to an output pin on the 7i77. Any ideas on that?

Thanks everyone in advance, please ask for any more information I need to provide

LinuxCNC does not have any built-in pins for axis motor brakes. Typically you would connect the brake release to the same HAL pin as the amp-enable, though probably to a different physical output pin.

PanagiotisZ wrote:
One of my motors uses a 24V powered brake. I think I need to directly wire it to an output pin on the 7i77. Any ideas on that?

The 7i77 max output load according to the manual is 300mA. Is that going to be enough to open and hold your brake? I kind of doubt that. You will probably need a relay.
Mark

The brake needs 0.5A, so I' ll try using a relay connected to my psu and the amp-enable to disable it.

Be aware that you might need a short delay before releasing the brake.

Thanks for noting! I am aware, I might need to place a timer on the enable signal, I m not sure yet how I ll implement it. I manually tried enabling and debraking at the same time and the drive presented an error because the brake caused over-current. When I complete the circuit I ll post the results.