Re: [CAD_CAM_EDM_DRO] Rutex

vrsculptor wrote:

> Has Rutex come back to life? I received a note from Vladimir and their
> web pages hows inventory available on all the 2000 series drives. Are
> these drives the classic version or a new revision?

Umm, yes, apparently. But, you might want to get an independant
opinion of any of their hardware before you go and spend money
there. I don't know how much improvement they have made on
their old products, or whether they have even gotten their
wildly inflated specs back in line. They at one time had taken
the published International Rectifier 25 C - infinite heat sink
- one-time survival spec and made it the peak current rating of
their drive at 75 C. That was something like 220 A. Of course,
their connectors were rated at 20 A at best, and that would have
dissipated 2420 W in their current sense resistors, even if the
transistors could have survived such an assault! Oh, I just
looked, they STILL list the R2020 at 220 A peak, and 0-70 C
temperature. Sorry to be blunt, but WHAT a crock! The 2-piece
plug connectors on the R2030 are rated at either 15.6 or 20 A
depending on which manufacturer's parts he uses. That amp is
rated to 110 A. The connector would explode in a bright flash
at 110 A. (Oh, I see up on the first page it says 34 A for the
R2010/R2030, and 56 A for the R2020. So, why the insane numbers
in the Electrical Specifications below?)

Ask Vladimir if he's ever TESTED the complete R2020 amp to 220
A! (I know the answer to this, he lets his CUSTOMERS do his
testing....)

And, of course, you need these hideous series resistors between
the motor and amp to cover up the other bad design features.
That's not on the data sheet, but with larger motors, the
returned current when braking will pop transistors unless you
add these resistors, which horribly sap system performance.
As far as I know, you still need these.

Jon