Re: odd yet consistant problem

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Steve Haushahn"
<haushahn@c...> wrote:

> This is happening at 100% jog and I am running it back and forth

-deliberately- till the drive faults...Which can be as quick as half a
table pass..Loosening up the gibs took strain off the drives but I
cant work close tolerance jobs with loose table like that..You
familiar with Rutex drives? I have the current limit variable resistor
cranked all the way to maximum current .Documentation with the drives
didnt give me any clues to 'proper' adjustment for that one...And no
,during approximately 50 runs of an engraving program it has never
faulted.But it is not a program that works the machine hard..

> Steven
>

The Rutex (at least the ones I have) do not appear to have thermal
shutdown. If they did, it would probably come after extended
operation of the drives under heavy load conditions. You would
probably not be able to comfortably touch the unit (too hot). Nor do
they have an intergal overvoltage shutdown.

I suspect that you are spiking past the current rating. Which drive
model do you have? What size motors. Have you monitored the DC
voltage as you do these jogs. I have some of the older R90 series
Rutex and a R996 I have been using for over a year on my plasma
cutter. They will definitely fault if you put the motor in a bind.
Motor current goes up dramatically if there is excess binding or
friction. give me the Rutex model numbers and some info (whatever you
have) on the motors and lets see what we can figure out.

Now is a good time to own a scope and current probe! Since a sudden
spike of current will shut the drives down it will be hard to catch
with simple meters.