2009/10/11 Hubert Bahr <h...@hbahr.org>: > The X3 sold by Harbor Freight and also Grizzley (G0463) use a > speed potentiometer. My first attempt will be to use the VFD outputs of > the Gecko G540 which provides an opto isolated pwm to analog reference. > In its case it is limited to 12 volts
Can I just mention again that it might be worth finding the manufacturers data sheet for the drive and seeing what they say? I managed to break some components around the potentiometer by trying a simplistic "replace the pot with a voltage" approach. It was only while trawling the net for a replacement drive that I found the instructions to apply the control voltage between motor negative and the pot wiper terminal (both of which had extra lugs on the board) and when I tried that I found I still had a working drive in external control mode. The manual stressed quite strongly that the variable voltage must be from a floating supply, not referenced to machine or PC ground. If the Gecko VFD drive voltage is not floating at both ends and your drive is similar to mine, then there is a fair chance of breaking both the drive and the Gecko. -- atp ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
