7i76 spindle setup

Is there a real manual for the drive that explains the speed control input?
The partial manual I found seems to indicate some kind of polarity swapping inputs (pushbutton+ pushbitton -)

Sorry I thought Id attached the manuals.

Yes the options all seem to swap the +/- by either external relays or the internal logic.

As far as I can tell you should be able to get bidirectional operation by driving PB8 with the 7I76s DIR output

Drive 7I76 TB4
1 --> 3 SPIN+
5 --> 1,5,7 SPIN-, ENA-,DIR-
6 --> 2 SPINOUT
8 --> 8 DIR+
9 --> 6 ENA+

That might work, I would have to connect pin 3 and 4 together as the inverted signal feed to pin 6 is output on pin 4.

I have emailed Sprint to see if that would be OK. I think the push buttons are latching so both are needed on a change over.

I have seen the similar thread RE +/-10v for indexing and I noticed that you said the analogue spindle output isn't fast enough for indexing. Would i be better to use the step gen output and then a converter for PWM with a +/- 10v outputs like a dc servo drive?

If I'm reading the manual correctly its should just work:

a) Hence if PB+ Terminal 7 remains open then a switch on PB- Terminal 8 can be used to change modes.

I did'nt spot the truth table! Mark from Sprint has aslo confirmed it works that way and that using the spin out into pin 6 will also invert the signal ok.

Tho only question seems to be if i can use the enable and direction direct to the 340 as aparrently it is designed for push buttons so has 47k pull upp resisitors to the +12v line. will the optos be ok to pull that down or would it be safer to use relays?

Thanks for you help with this, getting there now.