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Overcurrent meter goes to full scale!!! (RESOLVED!!!)
Posted: Tue Jun 16, 2015 11:05 am
by gantarone
I just installed a new laser tube ,
I connected everything .
set the potentiometer is nearly at minimum
but just do the test laser current meter goes to full scale!!!
the laser begins to work if I put the pot in the middle ( the needle always goes to full scale ) the laser starts to work but unable to affect just paper
I may not have well-insulated connections to the tube maybe....
Can someone please help me!!!
Please Help!!!!
Re: Overcurrent meter goes to full scale!!!
Posted: Tue Jun 16, 2015 11:13 am
by Tech_Marco
You need to post pictures of your connection. Can't help if without info from you.
Marco
Re: Overcurrent meter goes to full scale!!!
Posted: Tue Jun 16, 2015 12:06 pm
by gantarone
I just disconnected the old tube and replaced with the new one(the wires are only two and I have reconnected in the same position)
(at the moment I can not post photos , tomorrow I will post

)
Re: Overcurrent meter goes to full scale!!!
Posted: Tue Jun 16, 2015 12:11 pm
by Tech_Marco
Check the pot (assuming you're using a 3 legs potentiometer) connection that used to limit the laser current, that one of the legs that go to the Gnd may got lose. If it got in full scale, then what happen to the laser tube. Full power output also? I want to know more before we can help. Remember that by calling "not working", you will not get much hep
Marco
Re: Overcurrent meter goes to full scale!!!
Posted: Tue Jun 16, 2015 12:25 pm
by gantarone
Thanks Marco,
when i got full scale, the laser tube power output is vary vary low....
at the moment i'm outside, .....but i will check...
maybe I have disconnected the Gnd

Re: Overcurrent meter goes to full scale!!!
Posted: Tue Jun 16, 2015 11:43 pm
by Tech_Marco
Seems you didn't has the Gnd wire attached. If so, it is very dangerous
Marco
Re: Overcurrent meter goes to full scale!!!
Posted: Wed Jun 17, 2015 4:49 am
by gantarone
Re: Overcurrent meter goes to full scale!!!
Posted: Wed Jun 17, 2015 7:52 am
by gantarone
Bad news ,
now the power supply (side hight voltage laser) It stopped working.....
low power 12V is ok ...
I think that the power supply is gone
help!!!
Re: Overcurrent meter goes to full scale!!!
Posted: Wed Jun 17, 2015 12:29 pm
by Tech_Marco
Sorry to hear that.
BTW, the pictures you sent didn't help much because it is not completed and I can't see the completed connection. Plus, no label on each plugs.
May be you should get a standard LPSU instead.
Marco
Re: Overcurrent meter goes to full scale!!!
Posted: Tue Jun 23, 2015 7:16 am
by gantarone
Hi Again,
are really desperate ,

I have replaced the power supply but the problem remains .
Here it is my connection (below )...... but everything seems ok (because I did not touch anything ) ....
summary:
About a month ago the water pump stopped working and I burned the laser
I replaced the laser, but when I just turn the pot power the current goes over 40mA!!!
Please someone help me !!! I am desperate !!!
Re: Overcurrent meter goes to full scale!!!
Posted: Thu Jun 25, 2015 2:03 am
by gantarone
it is possible that the tube is broken again?
someone has an idea of what happened?
Please Marco I need your help , I'm in stuck!!!
Simone
Re: Overcurrent meter goes to full scale!!!
Posted: Thu Jun 25, 2015 10:00 am
by Tech_Marco
Sorry I have no clue. That power supply seems not able to output more than 30mA and ifor it could go beyond it. It is a little odd
Marco
Re: Overcurrent meter goes to full scale!!!
Posted: Thu Jun 25, 2015 10:00 am
by Tech_Marco
Sorry I have no clue. That power supply seems not able to output more than 30mA and it could go beyond it. It is a little odd
Marco
Re: Overcurrent meter goes to full scale!!!
Posted: Thu Jun 25, 2015 10:10 am
by gantarone
Re: Overcurrent meter goes to full scale!!! (RESOLVED!!!)
Posted: Thu Jun 25, 2015 10:18 am
by Tech_Marco