Help connecting servos to breakout board Mach3

[Agathon]

The drives are definitely step/dir input, and not analogue?

The creeping sounds just like what an analogue drive would do if the servo loop wasn't active, and the residual voltage was causing drifting. It would also tie in with the moving at speed, or creeping, as the direction pin goes from near 0V to whatever voltage it puts out at high (3.3-5v?).

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.

[Agathon]

Sorry see attachment.

[Agathon]

This is what the manual says in the introduction:

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.

[m_c]

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...

[Agathon]

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.

[m_c]

At least you know what the problem is now!

[Agathon]

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.

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!