tag:blogger.com,1999:blog-247130680149573043.post2560782748055096424..comments2024-03-21T02:26:58.014-07:00Comments on Don's Laser Things: K40-S Laser Power Supply Control "Take 2"DonKJrhttp://www.blogger.com/profile/14497402158163702122noreply@blogger.comBlogger11125tag:blogger.com,1999:blog-247130680149573043.post-46254637226593095832020-08-31T07:23:15.285-07:002020-08-31T07:23:15.285-07:00Yup! Do you have a specific item you want to under...Yup! Do you have a specific item you want to understand the relevance on?DonKJrhttps://www.blogger.com/profile/14497402158163702122noreply@blogger.comtag:blogger.com,1999:blog-247130680149573043.post-68682566888170579912020-08-28T21:19:52.594-07:002020-08-28T21:19:52.594-07:00Is this still relevant, today??Is this still relevant, today??pkhttps://www.blogger.com/profile/05863084765117557046noreply@blogger.comtag:blogger.com,1999:blog-247130680149573043.post-16517861632670227832020-01-19T15:31:00.884-08:002020-01-19T15:31:00.884-08:00It's a 5A cartridge fuse: * https://amzn.to/2N...It's a 5A cartridge fuse: * https://amzn.to/2NGJjJH <br />It may be larger than the original but works ok.<br />Located in this blog post: https://donsthings.blogspot.com/2017/01/k40-lps-repair-and-test.html<br />*As an amazon affiliate I earn from qualifying purchases.DonKJrhttps://www.blogger.com/profile/14497402158163702122noreply@blogger.comtag:blogger.com,1999:blog-247130680149573043.post-29751581958391555072020-01-19T15:16:13.133-08:002020-01-19T15:16:13.133-08:00Any idea what the input fuse ratings are on the 3 ...Any idea what the input fuse ratings are on the 3 green connector power supply ?gnhttps://www.blogger.com/profile/01958753505548347643noreply@blogger.comtag:blogger.com,1999:blog-247130680149573043.post-29256817525322683162019-03-19T10:08:05.035-07:002019-03-19T10:08:05.035-07:00This comment has been removed by a blog administrator.Anonymoushttps://www.blogger.com/profile/13489550152838869116noreply@blogger.comtag:blogger.com,1999:blog-247130680149573043.post-26229834000660142252019-03-16T14:54:23.631-07:002019-03-16T14:54:23.631-07:00It is very common for the LPS or arcs from the LPS...It is very common for the LPS or arcs from the LPS to cause USB problems. Usually this is from a poorly grounded system. <br />You must have good grounding without ground loops for digital controllers to work reliably with the high voltage available in this machine.<br />If you have any HV arcing you must fix that because nothing will prevent it from disrupting low voltage digital communications.<br />The LPS often go bad in these machines and the HVT arcs (hissing noise) this could be a source of your noise.DonKJrhttps://www.blogger.com/profile/14497402158163702122noreply@blogger.comtag:blogger.com,1999:blog-247130680149573043.post-50574407585301428412019-03-16T10:21:52.492-07:002019-03-16T10:21:52.492-07:00Hi,
Arduino and RAMPS arrived:) Have wired everyt...Hi,<br /><br />Arduino and RAMPS arrived:) Have wired everything and, from the first, it was firing the laser as soon as I have enabled "Engraving" button. So I checked the D6 using voltmeter and it was 5V just on Arduino boot-up. Looking at the source code of Turnkey, I just added:<br />laser_fire(0);<br />in the laser.cpp file and just before line:<br />laser_extinguish();<br />in function laser_init(). That solved the problem of PWM "full power" on boot-up.<br />However, I now how a different kind of problem and don't know why... I have tested with a .g code generated using Turnkey plugin and Inkscape streamed using Repetier. Laser started, did a couple of passes and stopped:( Sending commands from Repetied results in Repetier "stacking" commands. If I disconnect and try to reconnect, Repetier reports unable to connect because device is not responding. Then I unplugged and plugged USB in my laptop, the connection was successful. Tried the g code again, but now the same problem showed up but a little latter than before. Then I reconnected the usb cable and connected again and started the g code streaming without activating the laser beam. That went without any usb connection problems. Tried again the same but started laser after a couple of minutes: again usb stopped responding. I also tested just reconnecting to USB and fire a couple of laser beams using "Test" button. Again problem with communication!!!! So my conclusion is that firing laser somehow produces problem with Arduino USB communication that gets resolved with a simple reconnect of the USB cable. Did anyone experienced similar behavior? Is it possible that high voltage of the laser somehow blocks Arduino USB communication? I don't have LCD for now so I can't tell if Arduino is completely blocked or just the USB communication.<br />Anonymoushttps://www.blogger.com/profile/09617278242672264058noreply@blogger.comtag:blogger.com,1999:blog-247130680149573043.post-55750398608742898742019-02-25T06:17:04.959-08:002019-02-25T06:17:04.959-08:00Usually you can invert the PWM signal in the confi...Usually you can invert the PWM signal in the config.DonKJrhttps://www.blogger.com/profile/14497402158163702122noreply@blogger.comtag:blogger.com,1999:blog-247130680149573043.post-88015805461039180582019-02-25T05:59:29.027-08:002019-02-25T05:59:29.027-08:00I'll be using TurnkeyTyranny firmware and I ho...I'll be using TurnkeyTyranny firmware and I hope PWM is configured as non-inverted. Worst that can happen is that 20% power actually works as 80% (as an example) but will have a look at the configuration before burning firmware to Arduino. I am still waiting for Arduino and RAMPS to arrive but once I put all together and test, I'll get back with the information how all went:) Thanks for your help!<br /><br />Kind regards,<br />Gabrijel<br />Anonymoushttps://www.blogger.com/profile/09617278242672264058noreply@blogger.comtag:blogger.com,1999:blog-247130680149573043.post-56061979727243827822019-02-25T04:11:40.059-08:002019-02-25T04:11:40.059-08:00Yes I think the 2n7002 should work fine.
Take car...Yes I think the 2n7002 should work fine. <br />Take care that you are driving the gate properly.<br />Let us know here how it goes!DonKJrhttps://www.blogger.com/profile/14497402158163702122noreply@blogger.comtag:blogger.com,1999:blog-247130680149573043.post-71865842235493133962019-02-25T02:14:00.922-08:002019-02-25T02:14:00.922-08:00Hi,
Thanks for all your work and very detailed ex...Hi,<br /><br />Thanks for all your work and very detailed explanation on how to convert a K40 to an Arduino driven laser. I'll upgrade my laser with RAMPS board. However, I have a question regarding PWM control. The original controller board is connected to the "L" of the laser PS so I'll also connect the PWM like that. As not to connect directly to the RAMPS, I'll be using and N-MOSFET and the choice is 2N7002 connected as so:<br />1. Gate to PWM of the RAMPS<br />2. Source to ground<br />3. Drain to "L" on the PS board<br />4. 100kOhm resistor between Gate and GND (to ensure proper gate ground for the mosfet).<br /><br />Do you thing 2N7002 will be OK? Or I shall go with a different mosfet or maybe with a NPN transistor? Thanks!Anonymoushttps://www.blogger.com/profile/09617278242672264058noreply@blogger.com