1HCL Brake delay

[HighFreq]

@dc42 thanks, we tested but still have the same problem at random times. maybe it needs a bit more delay?

[dc42]

@highfreq when are these "random times" when the gantry drops: are they when you enable the motors, or when you disable them; or both?

[HighFreq]

@dc42 when we enable them.

[dc42]

@highfreq I notice from the config.g file in your other thread that you enable the Z motor (and hence disable the brake) using a M17 Z E command in config.g. I think the problem may be that when this command is executed, the supply voltage has not been high enough and the EXP1HCL not running for for long enough for the motor driver to have finished initialising. Therefore, please try one of the following:

• Either move the M17 Z command and the Z motor tuning commands to the start of the Z homing sequence;
• Or insert a G4 delay command in config.g immediately before the M17 Z command. One or two seconds should be sufficient.

If the driver has finished initialising by the time the M17 command is executed then I would not expect to need any delay between enabling the driver and releasing the brake, because the motor phases should be energised almost instantly whereas the brake will take a significant amount of time to release. It's different when powering down the motor because of the time that the brake takes to engage.

[HighFreq]

@dc42 will try and let you know.

thank you.