VFD spindle stopping speeds (normal M5 & E-stop)
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Firmware Wishlist
Hiya – I’m just making an observation about VFD spindle stopping times which might be useful to consider some behaviour of the Duet.
I'm using a RS Pro L510s VFD for a small 1.5kw spindle on my setup. These VFD are very customisable, for example I am able to programme mine to accept an input to switch between a main and secondary frequency select. That was I can use the signal from the duet – and switch to a manual mode using a potentiometer. I am also able to use a signal from my physical E-stop and to have two different stopping speeds. Under a normal M5 command the spindle will stop in just under 10 seconds but if I press the physical estop – along with an external M112 trigger for the duet, I have physically wired the E-stop to my VFD to perform a faster stop under 4 seconds.
I’ve noticed that if I press the digital estop button either on the web interface or paneldue, the spindle stops at the M5 speed. I want to request that the m112 command be revised so include the ability to select an arbitrary pin to use as an output trigger for braking components external to the duet – such as a spindle frequency drive.
Cheers, Savvas
