I’m trying to install the ultimate air support on my Ruida 6442G.
When I’m running a file with air support the voltage drops from 24V to 21.5V.
I only want to install the pneumatic solenoid valve to the +24V and Wind.
No need for me with all the switches.
Does anybody know what could be the issue? I think the voltage should drop to nearly 0V
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Your profile says “Sculpfun S30 Pro Max”, which is definitely not a DSP machine. What machine are you working on?
Where is that voltage measured?
Do you have a diagram of what you’ve wired up?
If the current required to run the solenoid exceeds the 6442’s 500 mA limit, it can kill the controller’s output transistor, after which the output will never work again. What is the valve’s current specification?
What kind of solenoids are you using? A link would be good.
I bought a set on Aliexpress, but the component itself is from Airtac
It’s a CO2 laser, Zing1390, I change my profile. The diode is my previous laser
I measured the voltage between +24V and Wind, directly on the Ruida connection. It’s on CN1
This is the schematic, BUT I only connected H (to G) I just let the compressor run continously, therefor I did not connect the relay to “Status”
Do you have a diagram of what you’ve wired up?
If the current required to run the solenoid exceeds the 6442’s 500 mA limit, it can kill the controller’s output transistor, after which the output will never work again. What is the valve’s current specification?
It’s an airtac 3v2-08-nc, I bought it as a package on AliExpress for CO2 laser assist.
I did read on a different thread about dead transistor. If you think that is the case, than I can replace the transistors. Just need to find out which type is used.
If that’s the case, then the voltage between 24 V and Wind should be about 0 V with the output inactive (Wind off) and a little less than 24 V with the output active (Wind on).
That does not match what you describe, so something is incorrect.
You should measure voltages between the Wind terminal (red meter lead) and Ground (black meter lead), which is what everyone expects when they read a voltage.
Relay H is miswired. When the Status output goes active (~ 0 V), relay H will close. The contacts then connect the Status pin to Ground, so the relay will never release: the controller cannot raise the Status pin when the relay contacts force it to Ground.
Following the link brings up a description with “AC110V standard voltage”, but the picture shows a relay labeled “24VDC”: the relays are available with many different coil configurations. If you have an AC version (particularly for 110 VAC), it will not work with the 24 VDC power supply. What relay coil is on the valve you bought?
The picture also shows “7.0W” at 24 VDC, which implies a continuous 300 mA load and does not include the much higher current immediately after applying voltage to the coil. While this should work with the controller’s 500 mA current rating, I would buffer the controller outputs with solid state relays, because relays are cheap and controllers are expensive.
@jkwilborn doesn’t use relays and has had no problems, so I may be overcautious.
Unless you have experience repairing surface-mount devices, this is difficult to accomplish without causing further damage.
Generally the package has a top mark identifying the specific transistor type, but manufacturers sometimes remove the marks to ensure only their service departments will use the correct device.
I assume you enabled air assist? You should also use snub diodes across any coil.
Your link’s description is a bit off, as @ednisley stated, AC110V, but the solenoid states 24V in the photo.
I believe these are the 4 output transistors on the motherboard, don’t know which is for the wind sink or for that matter which is which period.
On the solenoid it says 24V, same as in the picture
and indeed, the air assist output is on.
It’s working, in some way, but the voltage drop is only 2V5
Might try to connect it to Status and see if it operates. Status should go low when the machine is in run mode executing a layer.
You should measure voltages between the
Windterminal (red meter lead) and Ground (black meter lead), which is what everyone expects when they read a voltage.
Then I measure around 2.5V and 0V
Relay H is miswired. When the
Statusoutput goes active (~ 0 V), relay H will close. The contacts then connect theStatuspin to Ground, so the relay will never release: the controller cannot raise theStatuspin when the relay contacts force it to Ground.
I think it’s okay, when status is 0, total volt is 24V, relay sets the connection.
But I’m not gonna use it anyways
What relay coil is on the valve you bought?
It says 24V on the side, identical as in the picture, not sure why the website indicates an 110AC
But is 24V, for sure. I tested the solenoid at my job with 24V DC, and it worked
Unless you have experience repairing surface-mount devices, this is difficult to accomplish without causing further damage.
That is the easy part 
I work at a small PCB assembly factory
Generally the package has a top mark identifying the specific transistor type, but manufacturers sometimes remove the marks to ensure only their service departments will use the correct device.
I think its a MMBT2222A. Found in another discussion
Machine in idle, give 24V between Status and GND.
While running, Lighttower turns green, and voltage drops to 0V.
That seems to work.
I tested the solenoid at work on a power supply. It worked.
Also measured between Wind and Zero, it was 2.5V during running, and 0V when finished
Sounds like the wind transistor has gone out. Has all the symptoms.
If:
GND terminalThen the valve coil requires more current than the output transistor can sink to ground. Or, alas, the transistor is dead.
You should definitely have a solid state relay on that pin to buffer the controller’s output transistor.