Spindle reversing using a reversing relay wanted with delay or wait low RPM

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5 years 11 months ago #188836 by alkabal
Spindle reversing using a reversing relay wanted with delay or wait low RPM was created by alkabal
Hi all

I like to allow my spindle mill Cortini L300 to lowering the rpm before activating/desactivating relay.
The relay is connected directly to motor wire, inversion is like a manual switch, and i think this is a really bad idea to do this immediately whithout checking low rpm or 0 rpm.

Some month ago i do something similar for delay the enable pin from vfd for add a "soft stop"

Unfortunately the timedelay is not enough for reverse/forward change because the asked speed from motion is done immediately.

so i have do this that "do the job"" but i'm open to any better suggestion
Code:
# timedelay before changing direction for prevent too much current inside motor and relay setp timedelay.spindle-reverse-soft-stop.on-delay [SPINDLE_0]SOFT_REVERSE_DELAY setp timedelay.spindle-reverse-soft-stop.off-delay [SPINDLE_0]SOFT_REVERSE_DELAY net spindle-ccw => timedelay.spindle-reverse-soft-stop.in net spindle-reverse-soft-stop <= timedelay.spindle-reverse-soft-stop.out net spindle-reverse-soft-stop => [HMOT](CARD0).7i76.0.0.spindir setp near.spindle-reverse-timedelay.difference 0.002 net timedelay-near-zero-reverse <= timedelay.spindle-reverse-soft-stop.elapsed net timedelay-near-zero-reverse => near.spindle-reverse-timedelay.in1 setp near.spindle-reverse-timedelay.in2 5.002 # time elapsed after change so does not work at startup need to first select both direction for initilising net timedelay-near-reverse-enable-pid <= near.spindle-reverse-timedelay.out net timedelay-near-reverse-enable-pid => and2.spindle-reverse-timedelay.in0 net spindle-enable-soft-stop => and2.spindle-reverse-timedelay.in1 net spindle-enable-soft-stop-and2revdelay <= and2.spindle-reverse-timedelay.out net spindle-enable-soft-stop-and2revdelay => pid.spindle.enable

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5 years 11 months ago #188980 by alkabal
Replied by alkabal on topic Spindle reversing using a reversing relay wanted with delay or wait low RPM
Hi

Impossible for me to found a way to do this correctly from hal so I’m in the process of writing a .comp for allow spindle enable management and dir relay vs actual velocity.

This is not what I really want but that work really better :woohoo:


If this can be useful for someone you can ask

Br

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5 years 11 months ago #189064 by alkabal
Replied by alkabal on topic Spindle reversing using a reversing relay wanted with delay or wait low RPM
Investigating some signal i have see something strange, using 2.8 from rpi4 official iso (thanks a lot for this !!)

I have see some irregularity in the spindle.0.on signal with halscope

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What did you think about that ?

For the moment i can't reproduce so this is maybee only a little bug from halscope, i don't know

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5 years 11 months ago #189079 by alkabal
Replied by alkabal on topic Spindle reversing using a reversing relay wanted with delay or wait low RPM
Well

I have some good result with .comp for adding a soft stop and soft reverse.

The very good news is the unplanned good effect on the mill controller.

Planned : add some delay if relay need to be activated/deactivated before starting controller

Planned : add some speed check before reversing direction for controller that need a relay for inverting motor wire

Planned : Soft stop allow my lathe to decrease speed before activate the regen brake (i think this one is too much efficient but i wan't to keep it for emergency use) forum.linuxcnc.org/10-advanced-configura...le-soft-stop?start=0

Unplanned : Soft stop allow the mill (without any brake) to decrease speed more quickly :woohoo: B)

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