[3.5.0-beta4] PWM controlled Brake does not de-energize upon M18

[tristanryerparke]

Just upgraded from 3.4.5 --> 3.5.0-beta4 today to try the new PWM controlled brake feature on my machine. I use several 1HCLs on 48v and was previously running 48v and 24v to all of them for solenoids and a brake on the z axis (belt driven).
I used the command M569.7 P120.0 C"out0" V24 S250 to configure the brake and it all seems to work well until I tried M18 which made the Z axis drop. After M18 the axis is movable by hand with no resistance until resetting the machine.

@dc42 I'm assuming this is a bug as in 3.4.5 this did not happen with the 24v (non PWM) brake.
Cheers,
T

[dc42]

@tristanryerparke please try the 1HCL firmware at https://www.dropbox.com/sh/c4aatfdsejjjab0/AACGuZ4qUBvZz49zxErkhmnWa?dl=0 and let me know whether that fixes it.

[tristanryerparke]

@dc42 This did not fix the axis drop when sending m18 but it did seem to keep the axis from dropping upon hitting emergency stop.

I also noticed on this belt driven z with the 1HCL that sometimes the axis will drop during tuning using 3.5.0-beta4 (and still with beta4+ from dropbox). I believe I've fixed the issue by increasing the current slightly but if it worked in 3.4.5 with the lower current that would be the ideal situation. Can open a new thread for this if need be.

Overall the new firmware is making my X and Y 1HCL axes run super smooth/quiet and they seem to be able to run much faster than before.

Cheers,
T