- Configuring LinuxCNC
- Basic Configuration
- Crosstalk between water cooled spindle and endstops immediately when starting
Crosstalk between water cooled spindle and endstops immediately when starting
22 Oct 2018 20:48 #119220
by goaran
Hi,
a friend of mine has build a cnc that uses the "default 2,2Kw water cooled spindle" that is availabe on ebay.
Now there is the problem, that as soon as the spindle is started the endstops of the cnc are triggerd.
The spindle is not yet connected to PWM or something so its just the speed-control-inverter plugged in near the cnc.
As soon as the spindle starts (also very slow) the endstops of the cnc are triggered.
If it is plugged in a power point a few meters away at the wall it gets better but still sometimes triggers the endstops.
First I thought it might be because the endstop-wires are not shielded but even moving the spindle far away from the wires does not help.
The wiring of the endstops is as described here: linuxcnc.org/docs/html/config/stepconf.h...witch_wiring_options with the "Normally Closed Switches"
There are no pullup resistors at the moment but I do not see how this could lead to a false positive with the "Normally Closed Switches"-wiring.
Do you have any idea what could be the problem here?
Cosstalk trough induction over a distance of 2m (that is what we have tried) seems a bit far for me) or some ground-lifting problem over the powerline? Or something else?
a friend of mine has build a cnc that uses the "default 2,2Kw water cooled spindle" that is availabe on ebay.
Now there is the problem, that as soon as the spindle is started the endstops of the cnc are triggerd.
The spindle is not yet connected to PWM or something so its just the speed-control-inverter plugged in near the cnc.
As soon as the spindle starts (also very slow) the endstops of the cnc are triggered.
If it is plugged in a power point a few meters away at the wall it gets better but still sometimes triggers the endstops.
First I thought it might be because the endstop-wires are not shielded but even moving the spindle far away from the wires does not help.
The wiring of the endstops is as described here: linuxcnc.org/docs/html/config/stepconf.h...witch_wiring_options with the "Normally Closed Switches"
There are no pullup resistors at the moment but I do not see how this could lead to a false positive with the "Normally Closed Switches"-wiring.
Do you have any idea what could be the problem here?
Cosstalk trough induction over a distance of 2m (that is what we have tried) seems a bit far for me) or some ground-lifting problem over the powerline? Or something else?
Please Log in or Create an account to join the conversation.
23 Oct 2018 15:40 #119267
by andypugh
Replied by andypugh on topic Crosstalk between water cooled spindle and endstops immediately when starting
Electrical noise in the mains-feed wiring.
Put one of these (or local equivalent) on the power input to the VFD (close to the VFD)
www.ebay.co.uk/itm/250785925764
It might also help to pass the motor cables through (and maybe round) a ferrite choke.
And then you probably should add some software filtering in HAL too.
linuxcnc.org/docs/2.7/html/man/man9/debounce.9.html
Put one of these (or local equivalent) on the power input to the VFD (close to the VFD)
www.ebay.co.uk/itm/250785925764
It might also help to pass the motor cables through (and maybe round) a ferrite choke.
And then you probably should add some software filtering in HAL too.
linuxcnc.org/docs/2.7/html/man/man9/debounce.9.html
Please Log in or Create an account to join the conversation.
- Configuring LinuxCNC
- Basic Configuration
- Crosstalk between water cooled spindle and endstops immediately when starting
Time to create page: 0.066 seconds