Ruida RDC6442s air assist not working

Hi all, i have a vevor black and red cutter that im trying to hook up a cloudray ultimate air assist kit (bought directly from them).

I have it wired up as per the image attached. When i enable/disable blower in rdworks/lightburn it only seems to enable/disable the status pin. The air assist solenoid has the led barely lit and no change when runnings jobs with air assist on or off.

If i connect the ground line of the solenoid to gnd it fires ok. Im not quite sure what ive done wrong? Does anyone know what i should be checking?

air assist (1)

It’s probably that you haven’t enable the ‘air assist’ sink.

Screenshot from 2022-02-17 08-09-19

The ‘Status’ goes low or ‘sinks’ current anytime the machine is in ‘run’ mode. Seems pretty common that it’s used to enable air to the machine.

After that it goes through some type of restrictor to get low pressure for engraving. So anytime the machine is in ‘run’ mode you will have low pressure.

If you enable ‘air assist’ on a layer… when that layer executes, the ‘Wind’ goes low, picking a bypass solenoid to allow for full pressure air.

Make sense?

Beware of those solenoids… I found it was worth hooking them up and testing them before I used them.

I use two regular air solenoids, lower cost and less like to some other way… One for main air/high pressure, the other bypasses the restrictor.

If this is your application, I’d suggest the lower cost single solenoid valve. I use these.

24V Air Solenoid

If you already bought it, then I get it…

Good luck


Sorry i should have been clearer. When i “enable air assist output” it does nothing on the wind pin but it enables /disables the status pin.

Does that mean the solenoid isn’t operating or that you put a volt meter across it?

Some of those solenoid models have diodes in the ‘case’ so ensure you paid attention to polarity if it’s marked. Usually red/black wires or on the case where it goes into the solenoid body.

Have you ensured the solenoid is working? I’ve been burnt by these before, they are my first ‘go to’ suspect.

These are not only used for switching one feed to one of two outlets. The two outlets could be inputs to combine one with another. Flow is in the opposite direction. Look the same but they only function in the ‘wrong’ direction… making them useless for this application.

I have a 6442G, I doubt it operates differently. Don’t remember what the ‘S’ version is for.

The function of the ‘Status’ sink is to indicate it’s in ‘run’ mode. I don’t know how you could change it.

When I received my machine, ‘air assist enable’ was off and I was using the ‘Status’ to start the compressor and fan via a ssr. I had it that way a good month or more before I started dealing with the ‘Wind’ sink, and had to enable it…

We might want to go over the specifics again. Something doesn’t sound kosher.


Jack, thanks for that mate. When i say “does nothing” i should say the solenoid doesnt fire /no change on the led. Ill check that model number i may have mis-remembered it. Ill check the pin with a multimeter tonight.

What led? There is no led for the ‘Wind’ port, that I know of.

Maybe we are not talking about the same thing…

Yes, check the pin, from 24v to the pin, being negative.

While you are there, check that the ‘Status’ goes/stays low during ‘run’ mode.

If you have any connectors, it’s relatively easy to put a resistor/led together and just plug it in to see if it’s working. I like to ensure a ‘load’ since they are open collector outputs.

Good luck


I doubled checked and i have “enable wind assist output” set to true. The led i mentioned is the led on the solenoid. If i hook the solenoid up to the 24v and ground pins it fires and draws around 300ma. The same when it is hooked up to 24v and status when running a job. However when hooked to 24v and wind i only get around 40ma which doesnt switch when start and stop a job.

I also checked the model and it is a rdc6442s-b

This is odd… Since it works with ‘Status’ I would expect it to work with ‘Wind’.

Do you get full 24v across the solenoid when connected to ‘Wind’?

Not sure where to head here, if ‘Air assist’ is enable on the layer and on the controller is should be working. I have never seen a ‘partial’ current like that.

Almost sounds like a flaky connection…


I think the wind pin might be faulty. I am going to get another controller and give it a go.

Assume you don’t get the 24 volts.?

Hardware does ‘break’, but it seems pretty rare. These controllers are pretty tough, I’ve seen them really abused and survive.

Good luck, keep us updated…


Nah i get 21v. all i can think is i hooked it up wrong when i first did it and blew the pin. As soon as my controller arrives ill testit and update.

Since you know the solenoid works both ‘on the bench’ and via the ‘Status’ I think you’ve gone the only route available… I always hate to say it’s hardware…

Keep us updated…

Good luck

Take care.


I installed a new controller and its works right off the bat. Guess the pin is dead on that one


i have this same problem right now. i get no power on the wind pin.

and also this

sounds like i need to also get a replacement.


You shouldnt get power on the wind pin. It is a ground switch. You get pwr from 24v and use it to power your relay and gnd through the wind pin. With mine i was always getting a ground with a high restriction no matter what. Where the new unit there is no ground until i run an air assist layer.

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