http://pico-systems.com/osc2.5/catalog/product_info.php?products_id=31&osCsid=2n4hbnn63oqt9ncdlervb08tv6
On 2/12/20 1:52 AM, Gene Heskett wrote:
On Wednesday 12 February 2020 01:49:34 andrew beck wrote:
the option I just thought of while googling is, can I convert the sin
cos format in to a normal TTL or something like that? even 1000 ppr
would be heaps it is only on the spindle.
One thing you might try, is to use a couple of those $2 rs485 to ttl
boards. I bought an encoder to put on the rear of the spindle motor,
only to find on its arrival it had a balanced output of only a few
millivolts, nothing ttl about it. So I made a small hammond box with
two of those in it to translate it to ttl for feeding the encoder in the
5i25. Works a treat. But because the sin/cos is generally magneticly
generated, its signal may get weak enough to miss count at very low
speeds, which might lead to enough error to make sloppy threads when
rigid tapping with a peck routine. It might miscount at the turnaround
at the bottom of the hole.
I just want to get the data into the vfd so It knows when the motors
is slowing down. and so I can rigid tap and the existing encoder is a
high quality heidenhian one so might be good to keep it if it is not
too much trouble.
ISTR Jon has a board for that, see at PicoSystems.com.
regards
Andrew
On Wed, Feb 12, 2020 at 7:43 PM andrew beck <andrewbeck0...@gmail.com>
wrote:
Hi guys
wondering if anyone has any ideas here.
I have a heidanhain spindle motor that runs up to 10000 rpm and has
a 5v sin cos encoder on it. I am currently controlling the motor
with a schiender vfd. I am talking to the support engineers here in
New Zealand about buying a encoder card so I can get better low down
torque. If I run the card in full encoder closed loop control in
the vfd I can get 200 percent of the torque right down to 0 rpm for
30 seconds or so which is pretty useful. I am currently just
running the drive in Variable frequency control which rapidly looses
torque at low rpm.
Anyway they have a bunch of cards I can use but don't have a encoder
card that is suitable for sin cos encoders. I have no trouble
changing the encoder but am not sure if I can get a source of
encoders that spin up to 10k rpm.
Anyone have any suggestions?
regards
Andrew
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Cheers, Gene Heskett
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