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Blackbox PWM with NEJE 20w laser

Discussion in 'Controller Boards' started by Nathan Sowers, Dec 4, 2019 at 6:29 PM.

  1. Nathan Sowers


    Feb 6, 2018
    Likes Received:
    I am having issues with the laser being at full power all the time. (PWM has 5 volts won't do variable voltage) I have used the suggested 3 wire instructions. I also tried the spindle 0 to 10v and it reacts the same way. This should be able to adjust power for different power output for engraving and cutting. Any firmware settings I need to check? Am I missing something?

    NEJE 450nm 20W Laser Module
    Wavelength 450nm
    Radiator Size 30*80mm
    Material Copper + Aluminum
    Weight 202g
    Drive Position Built-in
    Is the Power Adjustable PWM can be adjusted
    Drive Protection Surge Protection, Overvoltage Protection
    Input Power approx. 12V2A, about20W (without fan power)
    Output Optical Power 5.5W
    Line Length 300mm
    Control Line Installation Method Pluggable
    Fan Size 30*10mm
    Fan Speed 15000 rpm
    Controllable Temperature Less than 60 degrees Celsius
    PWM 20KHz / 3.3V
    Temperature Sensor Yes
    Focus Range 40mm-60mm ( 50mm is best)
    Focus Diameter 0.05mm
    Best Focal Length 10mm from the light exit
    Interface Specification 4pin PH2.0 (red: 12V, black: GND, yellow: PWM, green: temperature signal)
    Main Applications Paper cutting, Wood cutting(<5mm), Depth Engraving, g-code drawing...
    Note 1. It is heavier, not suitable for engraving, only suitable for cutting.
    2. Please apply this module under the premise of safety protection!
    3. Recommended application machine: NEJE Master.
    4. NEJE Master comes standard with 12V2A charger. If you want to upgrade your old machine, you need to prepare another 12V3A power supply.
    #1 Nathan Sowers, Dec 4, 2019 at 6:29 PM
    Last edited: Dec 5, 2019 at 8:23 AM
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
    Staff Member Moderator Resident Builder Project Maker Builder

    Mar 1, 2017
    Likes Received:
    - Assuming you read gnea/grbl and are sending M3 or M4 with Sxxx where xxx is between 0 and the value of $30 in Grbl Settings
    - Make sure $32=1 is set
    - Make sure you are using CAM software that supports Grbl's Laser Mode and that the S value range is correct
    #2 Peter Van Der Walt, Dec 5, 2019 at 3:24 PM
    Last edited: Dec 5, 2019 at 4:24 PM

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