Problem with limit sensors, double triggering

I have a BlackBox x32 and openbuilds limit sensors. The limit switches sensors throw alarm when pressed but also when released, causing a double alarm.
I mean that the sensor triggers the alarm with a change of state and not just when pressed.

 

I have tried it with my custom machine but with the complete openbuilds kit. When you reach the end and press the sensor, all the movement stops and throws the alarm at me, I clean the alarm and when the movement returns it releases the sensor but when you release it, it throws the alarm again as if it were pressed again. I have checked and the sensors are connected correctly in the axes.

 

These are my settings, thanks for your reply.

 

I tried with 10, 15 and 20 mm and I still have the same problem

 

The purchased kit only brought 3 end-of-travel sensors, one per axis, a simple configuration. All three are connected at the same time in their correct positions.

 

I have tried with a sensor from another brand and it has the same behavior.
Apparently, when it detects the sensor that is pressed, it throws the alarm and when removing said alarm, the last state of the sensor is saved, having a change of state again, which is when the sensor is stopped being pressed, said change is detected and stops all movement again.

I don't know if I'm using the sensors wrong or I have to do some extra configuration.

 

I am going to try to put the upper layers of the sensors and I will test how it works. I do the tests with continuous movement. In a few moments I'll tell you how it went. Thanks.

 

I have already placed the covers on the sensors and with the insulating rubber they have been placed on the structure. Unfortunately I keep getting the same unwanted behavior. Any other solution ideas? As I told you, with the same connection mode but with a sensor from another brand I also have the same result.

 

That's right, I have tested with all the displacement of my table that is 3m. The sensor starts pressed in position 0.00 and when the movement starts it stops just when the sensor is released, which is approximately 3mm. We do not have any machine that generates EMI and the cables are separated from each other.

Is there any configuration to indicate that the sensors are to detect the zero position or the limit of the movement?

 

Cua

What is the difference between hard limits and home limits?

When the movement finds the sensor and presses it, the alarm is:
ALARM: 1 - Hard limit triggered. Machine position is likely lost due to sudden and immediate halt. Re-homing is highly recommended. [ undefined ]

And when I release the sensor when I try to return the movement, the alarm is:
ALARM: 3 - Reset while in motion. Grbl cannot guarantee position. Lost steps are likely. Re-homing is highly recommended.


I have the error:
[Starting...]

[14:56:47] [ Firmware Upgrade ] env: python: No such file or directory

[14:56:47] [ Firmware Upgrade ] [exit:127]

[14:56:47] [ Firmware Upgrade ] Firmware Update FAILED! Please review the logs above, or try again

 

I have updated the firmware, I have changed the settings to a stock machine (LEAD 1515), the movement is logically different but the behavior of the sensors is the same.

Sometimes alarms 1 and 3 are activated regardless of whether the sensor is pressed or released, sometimes the alarm 1 is activate when pressed or released the sensor.

When you say "disconnect the V+ cable" are you referring to the V+ cable of each sensor or the V+ of the general power supply?

 

I have already tried removing the V+ from the sensors but it seems that they are still working the same, they are activated by pressing and sending a signal, even without the power. And the double-activation behavior is still. Something to add, my plasma is low frequency and when it is on cutting it also triggers the alarm that an limits sensors has been activated, sometimes

 

Yes, the second alarm is related with EMI because when plasma is off, that alarm don’t show up. It’s necessary isolate the sensors?
And the double triggered persist in my system even without the V+ wire.

 

What is blowback? In fact my plasma inversor is LF, but I think that it’s a lie.

Yes, I have tried several cuts / movements in the air with the plasma completely turned off and the double triggered as well as alarm 1 and 3 also appear.

 

Is there specific documentation or videos on how to use the limit switch sensors?