LaserUser.com Forum (formerly RDWorksLab)

I'm not familiar with these solenoids, so my questions are very basic.

Is there an anti-kickback diode in parallel with the coil? If not, you'll need one. Generally speaking, when the current in an inductor is interrupted, the voltage will spike to compensate for it. It is possible that you damaged the RuiDa with such a spike (I hope not!). Upon further thought, perhaps RuiDa has an anti-kickback diode built-in to the controller.

Is the "Wind" connection open-collector? If so, that would affect your measurements when the coil is not present.

Jeffrey Aley wrote: Tue Feb 09, 2021 I'm not familiar with these solenoids, so my questions are very basic.

Is there an anti-kickback diode in parallel with the coil? If not, you'll need one. Generally speaking, when the current in an inductor is interrupted, the voltage will spike to compensate for it. It is possible that you damaged the RuiDa with such a spike (I hope not!). Upon further thought, perhaps RuiDa has an anti-kickback diode built-in to the controller.

mmmh. I not insert diode in parallel.
Today the valve do not open, and with the multimeter the tension is zero.
If I disconnect the valve from the controller, the tension go up to 24V. So, I think that the controllar has a protection (I hope).
The valve is 0,5A. I will try to insert a diode.

Jeffrey Aley wrote: Tue Feb 09, 2021 Is the "Wind" connection open-collector? If so, that would affect your measurements when the coil is not present.

I can't understand, what do you mean with "open-collector"?

By(t)e

Andrea Badiali wrote: Wed Feb 10, 2021

Jeffrey Aley wrote: Tue Feb 09, 2021 I'm not familiar with these solenoids, so my questions are very basic.

Is there an anti-kickback diode in parallel with the coil? If not, you'll need one. Generally speaking, when the current in an inductor is interrupted, the voltage will spike to compensate for it. It is possible that you damaged the RuiDa with such a spike (I hope not!). Upon further thought, perhaps RuiDa has an anti-kickback diode built-in to the controller.

mmmh. I not insert diode in parallel.
Today the valve do not open, and with the multimeter the tension is zero.
If I disconnect the valve from the controller, the tension go up to 24V. So, I think that the controllar has a protection (I hope).
The valve is 0,5A. I will try to insert a diode.

Please remember that the diode should be in parallel, and be reverse-biased during normal operation. In other words, the cathode should go to +24V and the anode should go to the WIND output.

Andrea Badiali wrote: Wed Feb 10, 2021

Jeffrey Aley wrote: Tue Feb 09, 2021 Is the "Wind" connection open-collector? If so, that would affect your measurements when the coil is not present.

I can't understand, what do you mean with "open-collector"?

By(t)e

"Open collector" is a circuit configuration in which the output is either "Open" = not connected, or it's connected to Ground (Earth). It never goes to 24V; you'd need to connect a load to pull up the output to 24V. It's a common electronics term, so you can probably find a better explanation on Google (and you can probably find an explanation in Italian!)

Jeffrey Aley wrote: Tue Feb 09, 2021 I'm not familiar with these solenoids, so my questions are very basic.

Is there an anti-kickback diode in parallel with the coil? If not, you'll need one. Generally speaking, when the current in an inductor is interrupted, the voltage will spike to compensate for it. It is possible that you damaged the RuiDa with such a spike (I hope not!). Upon further thought, perhaps RuiDa has an anti-kickback diode built-in to the controller.

Is the "Wind" connection open-collector? If so, that would affect your measurements when the coil is not present.

I think that I break my controller
Now if I start the engraving without any connect on pin wind, it shot 24V on multimeter, but if connect something (the valve with the diode or a relay), the voltage show 0...
Of course, the valve and the relay works, but the wind output don't works.

By(t)e

Jeffrey Aley wrote: Wed Feb 10, 2021 "Open collector" is a circuit configuration in which the output is either "Open" = not connected, or it's connected to Ground (Earth). It never goes to 24V; you'd need to connect a load to pull up the output to 24V. It's a common electronics term, so you can probably find a better explanation on Google (and you can probably find an explanation in Italian!)

Here:
https://forum.lightburnsoftware.com/t/a ... g/15935/39

someone tell that the wind output are open-collector.

By(t)e

Any suggestion?

By(t)e

Andrea Badiali wrote: Mon Feb 15, 2021 Any suggestion?

By(t)e

Connect a resistor between +24V and Wind. The value of the resistor can be anything from 1K to 22K ohms.
Use your meter to measure the voltage between Wind and Ground. Using this setup, you should be able to tell what the controller is doing, and whether it is doing it properly.

A low voltage (close to zero volts) would represent the Wind = "on". A high voltage (close to 24V) would represent the Wind = "off".

Jeffrey Aley wrote: Tue Feb 16, 2021
Connect a resistor between +24V and Wind. The value of the resistor can be anything from 1K to 22K ohms.
Use your meter to measure the voltage between Wind and Ground. Using this setup, you should be able to tell what the controller is doing, and whether it is doing it properly.

A low voltage (close to zero volts) would represent the Wind = "on". A high voltage (close to 24V) would represent the Wind = "off".

I will try, thank you.

By(t)e

Jeffrey Aley wrote: Tue Feb 16, 2021 Connect a resistor between +24V and Wind. The value of the resistor can be anything from 1K to 22K ohms.
Use your meter to measure the voltage between Wind and Ground. Using this setup, you should be able to tell what the controller is doing, and whether it is doing it properly.

A low voltage (close to zero volts) would represent the Wind = "on". A high voltage (close to 24V) would represent the Wind = "off".

Finnaly I tried.
I connected a 4.7k ohm resistor between +24 an Wind. When I switched on the laser, I read 23.1V between Wind and ground, before I started to engrave.
Then I removed the resistor and I read about 2 volts between Wind and ground, before or after I start to engrave.

By(t)e

Andrea Badiali wrote: Tue Mar 09, 2021

Jeffrey Aley wrote: Tue Feb 16, 2021 Connect a resistor between +24V and Wind. The value of the resistor can be anything from 1K to 22K ohms.
Use your meter to measure the voltage between Wind and Ground. Using this setup, you should be able to tell what the controller is doing, and whether it is doing it properly.

A low voltage (close to zero volts) would represent the Wind = "on". A high voltage (close to 24V) would represent the Wind = "off".

Finnaly I tried.
I connected a 4.7k ohm resistor between +24 an Wind. When I switched on the laser, I read 23.1V between Wind and ground, before I started to engrave.
Then I removed the resistor and I read about 2 volts between Wind and ground, before or after I start to engrave.

By(t)e

What was the measurement while the laser was engraving (with the 4.7k ohm resistor in place) ?

The measurement (2 volts) without the resistor does not really tell you anything.

Also, what kind of meter are you using - analog or digital?