Re: [CAD_CAM_EDM_DRO]Help please... SCR Servo Controller

zbarlranch wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, Babar <riet91@y...> wrote:
>
>
>>Hello Jon,
>>
>>Could you please recommend me some cheap DC (Brush
>>type) servo amps taking +/-10 V input ,to replace my
>>old GETTYS drives?
>>
>>Regards
>>
>>Babar
>>
>>--- Jon Elson <elson@p...> wrote:
>>
>>
>>
>>>Babar wrote:
>>>
>>>
>>>
>>>>Hello Friends,
>>>>
>>>>Does anyone can provide me some information about
>>>>
>>>>
>>>the
>>>
>>>
>>>>Inputs of GETTYS SCR Servo Controller Type
>>>>
>>>>
>>>11-1010-5H.
>>>
>>>
>>>>Or, any information about the website of GETTYS.
>>>>
>>>>
>>>>
>>>>
>>>These are obsolete antiques. Unless you have true
>>>3-phase power, the performance of these SCR drives
>>>is pretty awful. I think Gettys has been out of
>>>business
>>>for at least 20 years.
>>>
>>>Jon
>>>
>>>
>
>Not True. Getty's are still in business and going strong. They may
>be contacted at:
>(800) 558-9489
>As Jon says, you must have 3 phase power but they are excellent
>drives when matched with the Getty's motors.
>
>

Well, thanks for setting me straight. But, after some (more) searching
on the web, it seems they don't make their own servo amps, but resell
Yaskawa amps. I can't find any web site that mentions servo AMPS
under the Gettys label - only the motors.

Anyway, SCR servo amps must be at least 20 years old, and parts may
be very hard to come by, if you should need them. If Babar is trying to
use them in a retrofit project, he is likely to run into a number of
difficulties
in regards to 3-phase phase sequence, phase balance, etc. as well as making
sure the phase reference signals correspond to the power phases. I just
went through this on a Fanuc retrofit, where it was all still wired up
right,
but if any of it got disconnected, it would be a total nightmare to
connect it
up right again.

Jon

Jon