Too much burn power

[Len-Tikular (George Pilch)]

I dont know whats happening with my Setup, 75W Chinese Laser with Ruida 6442S B(EC)

from the simplest line to complex graphic my Millamp meter clocks around 18ma. Thats even with power settings set to zero. Laser is very bright and seems to be running at max power whatever power settings in lightburn I enter…
I have realigned all mirrors and they are spot on all the way round the bed.and I did a ramp test and that comes out as 20mm focus which is good. If I try slate then the burn is so fierce it almost melt.
Can any one help me put the correct.

Lightburn is also at the latest version.

[jkwilborn (Jack Wilborn)]

@Len-Tikular

Millamp meter clocks around 18ma.

This is a problem… I assume this happend quickly as it sounds like a hardware problem… From what I’ve seen of these, you’ve lost the laser power supply (lps).

You can do a quick diagnosis of the problem…

Set the Ruida for a continuous pulse at 50%… I just picked 50% as it’s easy to compute half of something…

Without the lps having mains power, pulse the machine and read the pwm (LPWM1) at the controller or at the IN terminal of the lps.

If it reads 1/2 of 5V (2.5V) then the controller would likely be ok and the lps would be at fault.

The L terminal or Laser Enable from the Ruida (L-On1) enables or allows it to lase at the IN or pwm specified current level.

Make sense?

[Len-Tikular (George Pilch)]

Thanks Jack, I’ll check this out tomorrow.

[Len-Tikular (George Pilch)]

No not making any sense I’m afraid Jack, Terminology is an issue for me. Ruida (L-On-1) I need to locate. What’s is IPS. Is that the main power supply. If so how can I pulse the laser. The connections to my power supply are H,L,P,G,In,5V L & P are tied together, There are no connections at H, or 5V

@jkwilborn

r allows it to lase at the IN or pwm specified current level.

[jkwilborn (Jack Wilborn)]

@Len-Tikular

I need to locate. What’s is IPS

Laser power supply (lps) or the hv supply to the tube…

Here are the main signals.

@Len-Tikular

L & P are tied together

L should be driven by L-On1 from the Ruida. Is there any wire from L-On1 to anything?

It’s ok that there isn’t any connections to the H or +5V connections of the lps.

[Len-Tikular (George Pilch)]

Hi Jack,

OK I understand now, I disconnected the Laser Power Supply (LPS)
I connected my Voltmeter to the ‘IN’ terminal of the LPW and earth.

with 50% power applied in lightburn I show zero Volts,

Am I doing this correctly.

George

[jkwilborn (Jack Wilborn)]

@Len-Tikular

disconnected the Laser Power Supply (LPS)

These signals come from the controller. If you disconnect the controller, and measure at the lps, it will (should) be in an off or low state.

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What I was suggesting, if you don’t have a switch that applies mains power to the lps, you can pull the mains connector (red box in photo) to disable the lps from working or lasing. The other connector is all the control signals.

Is this what you did?

[Len-Tikular (George Pilch)]

Thanks Jack, lots of testing this afternoon, I have established that the controller is indeed sending the correct pwm signals, evidently the LPS is ignoring them I think?

I hope the attachments are clear, 25% , 50% and 75% are shown as the pmw from the RuiDa to the input at the LPS

[jkwilborn (Jack Wilborn)]

I assume you have the order hosed up… appears to be 50%, 75% and 20%, in order.

Looks good… do you have two channels by any chance? PWM on one, and L on two…

If not…

Hook up to the L input and see if it’s active.

[Len-Tikular (George Pilch)]

Well Jack, that confirms that the controller is good.
I get 5Vdc at L-on1 with no file running. As soon as I run a file L-on1 drops down to almost 0Vdc, this indicates the controller is doing it’s job and it’s now looking to the PSU. I have asked Cloudray for a replacement as mine is still within warranty,.

Thank you so much for your help.

George

[jkwilborn (Jack Wilborn)]

From what you describe, it sounds like the lps… It’s much lower cost to replace the lps over the Ruida

Good luck