Re: [CAD_CAM_EDM_DRO] Added a VFD to my CNC mill

Dan,
I'm also running a Mitsubishi VFD but mine is the S500 series. Up
until just the other day, when I read a post from one of the list members, I
didn't realize it was possible to control speeds through the CNC driver.
That goes onto my list of functions when I design my system.

Marv Frankel
Los Angeles

----- Original Message -----
From: "Dan Mauch" <dmauch@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, October 27, 2002 11:32 AM
Subject: [CAD_CAM_EDM_DRO] Added a VFD to my CNC mill


>
> About a year ago I bought am Mitsubishi VFD for $238 on ebay. It
> came with a 190 page installation, setup and operation manual. I took a
> look at it and indeed it was a really nice inverter that would take
> single or three phase supply and would run the three phase motor on my
> enco mill. Most important was that it allowed for external manual
> control with a speed pot, Parameter Unit, (a fancy keypad and LCD
> display for programming the unit) and for setting various parameters)
> and last and most importantly it took a +5 analog signal from an
> external source for PC control. Well. I finally got around to connecting
> it to my machine. Wow! I am impressed. So far I am just using the
> parameter unit for changing speeds. It works like a dream and runs the 3
> phase motor much better than the Phase-o-matic inverter that I use to
> use.
> Most impressive is that you can program the acceleration and
> deceleration rates of the motor. Before my spindle would take for ever
> to coast to a stop. I would have to use the brake. Now I have it
> programmed to stop in 4 seconds.
> I am going to figure out how to use the analog signal from DeskwinNC to
> turn on and off my VFD and set the speed from computer via the G code. I
> think that would really be a nice to automatically turn on the spindle
> motor and set the speed via the program. So far I can heartily recommend
> the Mitsubishi FR200E series inverters. BTW I have been told these
> normally sell for around $800 but got mine New off ebay for a fraction
> of that. It sure is nice not to have to change pulleys all the time.
> Last I would like to know how to calculate the maximum safe speed that I
> can run the spindle at. I would think that the 3500 RPM 50 Hz motor
> would cause the spindle pulley to explode if run at 400 Hz.
> Dan
>
>
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