Video of machine using G251s
Apart from the confusion as to whether or not the G251s are opto-isolated, the drives installed easily and integerated easily with the MACH software as you would expect. There has been a bit of confusion as to if the drive is opto-isolated as the website used to say that it was. As there is no isolation, it appears as though there is some sort of ground-loop problem causing a vibration on the motor(s) while at rest. This should be easy to resolve when I get a chance.
Here is a video of the first run of the machine using the G251 drives. With only a few minutes of tuning, the X-Y rapids are at 600 IPM. This is really good considering the ratios of the mechanical drives, and that I am only using a 35 volt supply.
One of the more "difficult" tasks in tuning things was the slow-speed adjustment on the drive itself. Finding a screwdriver tip that would fit well into the POT proved to be a problem. It is a tiny philips screw that is very shallow so you almost need a small screwdriver with the tip ground flat.
This should be the link to the video
http://www.youtube.com/profile_videos?user=RIAMCNC
Not sure if I did everything correct with setting up the You Tube account or even the link to the video. It appears to work for me, but I know how these things can get a bit "wanky".
Chris
Chris D and G251, a happy couple
WOW
Any chance you might post/share your code for your test program? Are you a choreographer by day? Impressive machine and demonstration.:)
select a higher rated D1 for "Returned Energy Dump"
Quote:
Originally Posted by
rwaudio
Mouser part numbers you could use are:
TIP147 = 512-TIP147T
D1 = 512-1N4007
You will need something bigger for D1, the 512-1N4007 is only rated at 1A. From my understanding of the circuit "Normally power supply current flows thru rectifier D1", therefore D1 needs to be rated at the power supply current. This is why there is no part number identified in the circuit as it will depend on your application. To find the correct diode search for "rectifier diode" and chose one with a rated current equal to or greater than your power supplies max current. e.g. power supply current is 7.5Amps, find an 8-10Amp rectifier diode.