boom and dark

[Jacala]

Hello!

My DSP-40 watt dsp laser system had a weard encounter.

I was engraving a large tekst (lots of laser on time) an then the main fuse of my house blew. After that the lasermachine would power on but the laser would not fire.

After opening the laser powersupply, noticing a broken fuse and replacing that it all worked fine again.

But that can not be healty for the system. Overheating? I was burning at 85% power.

Weard.

[Tech_Marco]

Not quite sure what is your problem now. Did you mean the power is always at 85% high?
Did you check the Max power setting? You may want to update the setting onthe DSP. If it doesn't help, then the control circuit on the power supply should be damaged.

By the way, what caused the blew of the fuse?


Marco

[Jacala]

The laser cad setting was at 85%, I never go above 90%

the DSP setting is MAX power 90%

Wat caused the fuse to blow? No idea, I flipped the main fuse in my house en replaced the glass fuse in the laser power supply. Then everything worked again.

[waltfl]

he hey
did you wath the current???? probably not because if you have the max setting at 85% and never go over 90%
you overtpower the tube because the most machines can only use up to 45% to be below the max current of 18mA
for the 40W tube. the DSP does not control the max current if you use 90% then the tube would be powerd to about 24mA
and this will destroy your tube verry fast ( within a few 100 hours)
greetings
waltfl

The laser cad setting was at 85%, I never go above 90%

the DSP setting is MAX power 90%

Wat caused the fuse to blow? No idea, I flipped the main fuse in my house en replaced the glass fuse in the laser power supply. Then everything worked again.

[Toasty]

Holy crap! You never go above 90%?!?!

I have mine set to never go above 30%. I can't imagine driving it at 90!

That being said. I'm surprised it threw the main breaker in your house. My machine has a small fuse where the mains power comes into the case. I think it's only 5 amps or something like that. Hard to believe that wouldn't blow first.

If I was the programmer for this software I would have it default to a much lower percentage out of the box.

Btw, anyone know how many amps the fuse is on a k40 (120 volt version)? I don't see any numbers on my fuse and I'd like to get a couple spares to have around.

[Tech_Marco]

I think he may has other appliance are sharing the AC outlet. The 40W power supply was just a "trigger " to cause the blocker latched. It happen if you share water heatwr,or microwave .

For 220v version, you may try 2.5A fuse. For 110v version, use 5A should be fine
But I can't imagine how it couLd below the fuse of the power thought . I thing the HV cable could be damaged and cassing "leak" sothat the PS was overloaded

As I have emphasize times that the grounding of a laser machine is impotant more than anything, especially in regard to safety.

Marco

[Jacala]

mmm, how do you measure the 18 mA?

Then I'm gonna do that before using the laser more.

I thought that a 40 watt power supply could power a 40 watt tube and that they were matched for each other.

But apparently it could be easily overpowering my tube. when set to 90% with the software?

So: how do I measure the 18 mA maximum?

I must use the ground terminal of the laser on the power supply and use the meter as I would with a normal amp check right?

[waltfl]

hi jacala
you need to put a mA meter between the negative pol ( black or blue wire on the tube) and the sam wire what goes in the
laser power supply.
the most K40 machines have a mA meter build in already thats what you need to use, only then you can control the real current what goes in the tube
greetings
waltfl

mmm, how do you measure the 18 mA?

Then I'm gonna do that before using the laser more.

I thought that a 40 watt power supply could power a 40 watt tube and that they were matched for each other.

But apparently it could be easily overpowering my tube. when set to 90% with the software?

So: how do I measure the 18 mA maximum?

I must use the ground terminal of the laser on the power supply and use the meter as I would with a normal amp check right?

[Jacala]

Thanks Walt!

I'm gonna do that right now.


After checking:

I'm reaching 18 mA at 68% so I've set my max to 65%

Now, i'm gonna align my mirrors and give the machine a maintenance checkup.

Thanks for the information!

[waltfl]

Hi jacala
no set the max to 93% in the manufacturer settings, remember the DSP does not control the current
this is what you do with your power setting for each file part.
my experience is:
for engraving set the frequency to 20,000Hz
for cutting set the frequency to 15,000Hz
greetings
waltfl

Thanks Walt!

I'm gonna do that right now.


After checking:

I'm reaching 18 mA at 68% so I've set my max to 65%

Now, i'm gonna align my mirrors and give the machine a maintenance checkup.

Thanks for the information!

[Jacala]

I've set the max power (65%) in the manufacturer parameter tab of the system options.

Now I can not go higher than 65%.

Is that what you mean Walt?

[waltfl]

hi jacala
no again, the most importantfactor is the current what should never go over 18mA that the tube would
not be destroyedvery fast. the percentage is just for orientation.
if your tube needs allready 65% to get 18mA then it is allready on the way out and I would recommend
to order a replacement. that does not mean you can not work with it it just takes higher settings in the file
settings and mostly the cutting does not go as far as it did before.
greetings
waltfl

I've set the max power (65%) in the manufacturer parameter tab of the system options.

Now I can not go higher than 65%.

Is that what you mean Walt?