Low power high speed

[simon harker]

Hello,

Sorry to be a pain but i am back again :)

So thanks to Dave I have a laser machine running and been using it for about a week now,

Now I seem to have developed a problem. When running at high speed and low power. The laser does not fire. e.g. 100speed and 20% power. Nothing happens. Higher power or lower speed and it works fine, No problems at all.

Any advice, is this normal?

Thanks

[Dave Sheldrake]

Hiya Si,

Some DC tubes don't like firing when you get down to under 20% power, the bigger the tube the more power is required to sustain the arc. Sounds like it *may* be a trigger wire if the machine runs ok at slower speeds.

Have a check of the wiring where it goes into the HV psu and at the opposing end where it joins the card. Sometimes the wires can shake loose so give them a nip up with a screwdriver just to be sure.

PLEASE leave the machine off for 24 hours first, the residual power in the PSU hot side can be quite an experience ;) it won't kill you but it's not something you want to experience for laughs :)

good news about the machine though :)

best wishes

Dave