Trouble firing 45 watt TTL Laser on "output6_buff" PMW

jimakron

Is it possible to us the 'out6_buff' to fire a TTL CO2 Laser? We are currently trying to control an 45 watt TTL CO2 Laser using a Cloudray MYJG50W Power Supply using a Duet 3 Mini5+ Control board.

On the Cloudray MYJG50W power supply, the 'L' pin is a digital on/off >3 Vdc = OFF and less than .3 Vdc = ON. The 'IN' pin is the analog PMW signal.

We are ABLE to fire the laser using the 'out6_buff' pin on the Duet 3 Mini +5 control board when we wire the 'out6_buff' to the L pin on the MYJG50W.

We are NOT ABLE to fire the laser using the 'output6.buff" pin on the Duet 3 mini 5+when we wire to the IN pin on the MYJG5W. The 'L' pin on the MYJG50W is a Digital TTL on/off and the 'IN' pin is a analog 0-5vdc analog PMW signal.

Since the 45 watt CO2 laser that we are using TTL logic, I had to use a '!" to invert the output in the config. g file in the program to fire the Laser on TTL low.

; Tools
M563 P1 S"Laser" F0 ; define tool 1 Laser
G10 P1 X0 Y0 Z0 ; set tool 1 axis offsetsC
G10 P1 R0 S0 ; set initial tool 1 active and standby power to 0
M452 C"!out6" R255 S0 F3000 ; enable Laser mode, on out6 (F3000)

I'm not sure if this is a programming issue or a wiring Issue. Any advice to resolve the issue will be greatly appreciated.

fcwilt

@jimakron said in Trouble firing 45 watt TTL Laser on "output6_buff" PMW:

Given the IN pin accepts 0-5 VDC or PWM I suspect that you need to connect a resistor (1K should be suitable) from the 5V_EXT pin to the out6_buff pin.

Frederick

droftarts

@jimakron said in Trouble firing 45 watt TTL Laser on "output6_buff" PMW:

We are NOT ABLE to fire the laser using the 'output6.buff" pin on the Duet 3 mini 5+when we wire to the IN pin on the MYJG5W.
The ... 'IN' pin is a analog 0-5vdc analog PMW signal.

M452 C"!out6" R255 S0 F3000 ; enable Laser mode, on out6 (F3000)

Have you got a link to the manual for the Cloudray MYJG50W PSU? The product page is quite vague, https://www.cloudraylaser.com/products/cloudray-50w-co2-myjg-series-power-supply-black-shell-myjg-50w

As far as I can tell 'H' and 'L' are on/off (L being H inverted) inputs. The 'IN' pin is said to support "input 0V to 5V analog signal, can also input PWM signal" (there's no such thing as an "analog PWM" signal). By 'analog signal', it means a signal of 0 to 5V, usually controlled by a potentiometer. The Mini 5+ output6.buff doesn't supply an analogue signal, only a 5V PWM signal.

I can't find any information on the PWM frequency that the Cloudray MYJG50W accepts, but it's possible that F3000 in the M452 command is too high. The firmware default is 500Hz (F500), have you tied that?

Ian