@donkjr Both with it connected to the lps and the 24v psu and not connected at all???
@Andy_Shilling
Best I can tell where you had the ground connected for the PWM is correct i.e. that is ground on the C3D (see board layout). @raykholo ???
Since removing it allowed the PWM to work something is “wrong” as that should not have made any difference.
Since you have a disconnect (reset) problem I suspect a ground loop exists.
Here is how I recommend (and have mine wired). That is not to say that all grounding acts the same :(.
Also check that your LPS frame is screwed to the body of the K40.
The circled “GND” is indeed a Ground and the other circled one 2.5 is the output of the N FET which turns L on.
I would concur with Don that something in the wiring is causing the reset issue.
I’m just sketching up my wiring for you to see.
@Andy_Shilling high level light control is the same as TL but it is high true.
Let me look over this tonight, in shop now and I’ll get back to you.
In the mean time try and take some pictures that show both ends of working in the same photo.
thanks @Andy_Shilling try running a wire from the 24v power supply ground (V-) to the frame.
I am assuming that E on your drawing it FG on the connector?
Where is the return from the lasers cathode connected?
Yes Don E is the chassis earth, this LPS has the high voltage and Cathode return seperate at the back of the unit.
So what your saying is to run a new wire from V- to earth from the 24v PSU correct.
@Andy_Shilling yes. If that does nothing then I would go around and measure (with power on) the voltage from the single point ground to all the other grounds and from ground to ground to see if there is voltage between any two ground points.
Try the above static and also while pulsing the laser test button.
@donkjr ok I will be home from work in 5/6 hours, I will check then and get back to you.
@donkjr Ok I’m in with the machine, I have just checked the lps psu and c3d for ground and it seems when I check the 24v psu I have 0.04v going to ground but neither the lps or c3d do. I have tried replacing both the earth lead and running a new wire from V- to the chasis earth but this has made no difference to it.
The 24v psu is only 4 weeks old but am I right in saying it shouldn’t be sending any voltage to ground no matter how small.
New update I feel a fool but also very confused. I am running a small job on the laser to see if it does disconnect completely and thought I’d watch the usb ports in device manager. Well let me tell you it’s not the bloody laser disconnecting it’s my mouse whenever the laser is firing:exploding_head:
. So if anyone could tell me why that happens I would be very greatful lol.
I don’t have another mouse to try at the moment but I am very happy that is not actually the laser having the problem.
I’m guessing it’s your usb port. @raykholo didnt we have a problem with certain usb configs.
@Andy_Shilling do you have the usb powering the c3d?
No it’s not Don, I cut the usb power when I was using my Mac. The strange thing is my web cam keyboard and the flash drive in using atm don’t seem to have this problem.
@Andy_Shilling where and how EXACTLY are you measuring the .04V?
To retract a bit. If you connect a ground from the C3D to the LPS like you originally had does the PWM still stop working?
My guess it that somehow you are injecting noise into your PC, or lifting its ground from the large energy dump in the laser. That is why USB things are disconnecting.
I think this is a byproduct of some other grounding problem as signified by the fact you cannot connect rational grounding between the C3D and the LPS.
This still does not make much sense …
@donkjr right let me try and get this in the correct order.
-
no laser fire on the first start up with C3D to Lps ground
-
Removed ground from C3D and lps, laser fires.
-
Check LPS ground to earth shoes 0v
Check C3D ground to earth shows 0v
Check PSU V- to earth shows 0.04v. -
Run a job with C3D only connected to PSU V-, job completes but with disconnection sounds throughout.
At that point I realised it was the mouse disconnecting not the C3D.
5 I think I then rewired the C3D to the lps ground and tried again and this time it run ok but still with the disconnect.
- To be continued because I have no idea what’s happening now, I am in your control.
@Andy_Shilling
Checking #5 says that you now have the gnd from the C3D to the LPS and the laser fires ok, but the disconnect happens???
@donkjr yes the ground at the lps is crimped in with the test switch so rather than cut the wire I just disconnected it from the C3D screw terminal and taped it up while testing your instructions. Once I found the 0.04v I automatically just untaped it and connected it back up and it worked?
I have no explanation to it but yes I still get the disconnect from the C3D usb.
I have ordered a new shielded usb lead just to make sure that’s not the problem.