Re: [CAD_CAM_EDM_DRO] Inverter Drives

C.S. Mo wrote:

>I'm looking at purchasing an Inverter drive for my milling machine. The
>machine has a 3phase 3hp motor with a variable speed head. The spindle
>speeds range from 80-4200 rpm.
>
>I'm currently looking at two Teco drives - the FM50 and FM100. The basic
>difference seems to be that the FM50 only goes up to 120hz, whereas the
>FM100 goes to 400hz. Will I ever need/want to run the motor at >120hz?
>Also, ultimately I want to control the rpm with Mach1/2 or EMC. Are there
>any potential problems with either drive for doing this? Has anyone else
>used either of these particular drives?
>
>If you are only thinking of using the standard 60 Hz motor on the
>

stock spindle, 120 Hz is probably all you should permit. Running a 60
Hz motor on 400 Hz, and
increasing spindle RPM that much, too, could be asking for serious
damage. If you ever want
to put a high-speed direct-drive spindle, like a Rockwell/Precise or
Westwind on it, however,
the extra frequency is what you want.

Mach 2 should have methods to control the analog input to the VFD, and
EMC can in some versions.
When some more work is done documenting the internals of EMC, it should
be possible to
get analog spindle control from all variants of EMC.

For a 3 Hp motor, and running from single phase, you might want to go
for a 5 Hp drive (unless these
are specifically rated for single-phase input.)

>

Jon