limits switch activated randomly
- echesortux
-
Topic Author
- Offline
- Senior Member
-
Less
More
- Posts: 46
- Thank you received: 1
30 May 2016 14:56 #75246
by echesortux
limits switch activated randomly was created by echesortux
Hello everybody, last saturday our plasma machine started for first time we are very happy but we are having problems with limits switches the problem is that they are activated are anytime even when the machine is stopped. the configuration we have is the following:
home + both limits X
home + both limits Y
home + both limits Z
all of them normal close and we used invert option.
Someone has any tip or idea what this misbehavior happens. could it be a software issue? the swithces don't seem to activated in the breadboad
thanks in advance.
home + both limits X
home + both limits Y
home + both limits Z
all of them normal close and we used invert option.
Someone has any tip or idea what this misbehavior happens. could it be a software issue? the swithces don't seem to activated in the breadboad
thanks in advance.
Please Log in or Create an account to join the conversation.
30 May 2016 17:23 #75255
by PCW
Replied by PCW on topic limits switch activated randomly
This is usually a symptom of impulse noise pickup in the limit switch wiring
The most commonly applied fix is installing the debounce component
to filter the signals, something like:
loadrt debounce cfg=3
addf debounce.0 servo-thread
setp debounce.0.delay 20
net rawlimitx debounce.0.0.in
net rawlimity debounce.0.1.in
net rawlimitz debounce.0.2.in
net filteredlimitx debounce.0.0.out axis.0.home-sw-in
net filteredlimity debounce.0.1.out axis.1.home-sw-in
net filteredlimitz debounce.0.2.out axis.2.home-sw-in
The most commonly applied fix is installing the debounce component
to filter the signals, something like:
loadrt debounce cfg=3
addf debounce.0 servo-thread
setp debounce.0.delay 20
net rawlimitx debounce.0.0.in
net rawlimity debounce.0.1.in
net rawlimitz debounce.0.2.in
net filteredlimitx debounce.0.0.out axis.0.home-sw-in
net filteredlimity debounce.0.1.out axis.1.home-sw-in
net filteredlimitz debounce.0.2.out axis.2.home-sw-in
The following user(s) said Thank You: echesortux
Please Log in or Create an account to join the conversation.
- tommylight
-
- Away
- Moderator
-
Less
More
- Posts: 18514
- Thank you received: 6184
31 May 2016 01:37 #75274
by tommylight
Replied by tommylight on topic limits switch activated randomly
Also use shielded cabling on all inputs, all shields grounded properly, no machine cables going parallel with the torch cable, computer and electronics as far as possible from the plasma and torch cable. All this is paramount to a functioning plasma cutter, especially if you have a HF/HV start plasma (high frequency, high voltage). If using a cheap break out board, they need to have pull up resistors on all inputs, if they do not already have them, on some you need them at a lover value even if they do have them ( some cheap BOB use 10K pull ups and that is way to much for plasma functionality, they need to bee 1K or even 470Ohm ) otherwise they tend to get messed up as soon as the torch fires.
Regards,
Tom
Regards,
Tom
The following user(s) said Thank You: echesortux, stan
Please Log in or Create an account to join the conversation.
- echesortux
-
Topic Author
- Offline
- Senior Member
-
Less
More
- Posts: 46
- Thank you received: 1
31 May 2016 13:42 #75289
by echesortux
Replied by echesortux on topic limits switch activated randomly
how should I grounded all shields properly. Sorry but I have never used shield cables?
Please Log in or Create an account to join the conversation.
- Todd Zuercher
-
- Away
- Platinum Member
-
Less
More
- Posts: 4978
- Thank you received: 1377
31 May 2016 13:48 #75290
by Todd Zuercher
Replied by Todd Zuercher on topic limits switch activated randomly
Connect them to ground at only one end (the control end).
The following user(s) said Thank You: echesortux
Please Log in or Create an account to join the conversation.
Time to create page: 0.155 seconds