Er, the settings are backwards, but perhaps the author was using different software. The result is still the same.Quote:
Originally Posted by Agathon
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Er, the settings are backwards, but perhaps the author was using different software. The result is still the same.Quote:
Originally Posted by Agathon
To be honest I'm not sure. The manual seems to suggest they are step/dir compatible and, to my knowledge, no other forum posts dealing with these drives have mentioned it. The sheet from the manual that I posted seems to state that it will accept pulse and direction.Quote:
Originally Posted by m_c
Sorry see attachment.
Attachment 22483
This is what the manual says in the introduction:
Quote:
Control Functions:
Any one of the following 4 control modes can be selected in the parameter settings.
S Position Control (Factory Setting)
Controls the position and speed of the Servomotor very precisely with pulse-train input signals. Any one of the following 3 pulse trains can be selected: forward/reverse pulses, feed pulses/ directional signals, or 90 degree differential phase (A/B phases) signals.
I'm going to ask a simple question, you have compared the full model number on the drive to the manual?
It's not got any additional codes that could signify it's a slightly different model?
I've just searched for Omron R88D-U Analog, and it's thrown up a link to an analogue input version of the drive...
Ouch - I think this has just turned into an expensive experiment. The model number is R88D-UA08V. The A is for analogue. Bollox.Quote:
Originally Posted by m_c
At least you know what the problem is now!
Well, it's not all negative. It's a steep learning curve, but I'm pretty sure the 200W servos will drive the Fehlmann table without too much trouble. There seem to be plenty of Omron/Yaskawa drivers about and I'll think hard about a use for the three analogue drivers I have - they'd make an excellent power feed for a small mill.Quote:
Originally Posted by m_c
It is a lesson in there not being any free lunches and if something is a bargain price then there's a reason. I shall embark on the next purchase with the question of analogue and digital firmly planted in my consciousness!
I know I'm going to regret asking this as I'm sure it will be more complex and expensive than just shoving these drives back on fleabay, but...
A brief and desperate search leads me to believe that it is possible to control analogue servo drives for position by converting step and direction to analogue signals. Anyone have any knowledge/experience?
This chap appears to be doing the very thing:
https://youtu.be/kQV5dGQltpU
if you have a suitable spare galil lying around, then its a very valid option, but galil boards are not that cheap.Quote:
Originally Posted by Agathon
I've seen step/dir to +/-10v interfaces mentioned, but can't remember ever seeing one that's commercially available.
If you did want to run analogue servos, a CS-Lab Csmio/ip-a, Dynomotion Kflop+Kanalog, or whatever the Mesa analogue output board is, would be far better options.