On Wed, 2017-02-15 at 14:06 -0800, Kirk Wallace wrote: > On 02/15/2017 10:36 AM, Valerio Bellizzomi wrote: > > On Wed, 2017-02-15 at 10:22 -0800, Kirk Wallace wrote: > >> On 02/15/2017 09:25 AM, Valerio Bellizzomi wrote: > >>> Hello, > >>> > >>> I have an Toshiba vfd which has a current signal input (max 20mA), is > >>> that compatible with linuxcnc to be wired to S gcode command ? > > > > I am not aware of any interface hardware , I thought to wire one > > parallel pin to the vfd, but I might be wrong. > > > > suggestions? > > If you reply with the Toshiba model number, we could give you better > information. Pictures and overview of your project would be even better. > > Basic direction an speed control can be done with just a parallel port > and a few electronic parts. Here is an example: > http://linuxcnc.org/docs/html/examples/spindle.html#_pwm_spindle_speed > > The PWM bits create an analog signal using a digital parallel port pin > and switching it on/off in a way that effectively acts like an analog > signal. This would go to your VFD analog speed or frequency input. This > is only needed if you want LinuxCNC to control VFD speed. The example > shows the PWM signal being connected to the parallel port pin 9. > > Sections 3 and 4 below the spindle section (2) connect the basic digital > signals to parallel port pins 14, 16, and 17. > > Usually the VFD inputs are opto-isolators which are usually a floating > LED and current limit resistor circuit. Common parallel port buffer > boards are good for driving these inputs. A breakout board with > opto-isolators is not needed. A nice thing about parallel ports is that > add-on cards are cheap and you can add as many ports as your computer > slots can hold. The down side is that parallel ports are slow, so the > PWM signal will not have high resolution. >
the VFD is a Toshiba VFS15-4037PL-W, it has a Forward input, a Reverse input, and a current speed input (and alternatively a 0-10V input). There isn't an enable input. I do not need the reverse so it should be two parallel pins, one for forward and one for speed. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
