Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: derek on November 18, 2012, 10:36:55 AM
-
Hi
I have a spindle sensor setup using a QRB 1134 optical sensor. I'm installing a Delta VFD-M for my ATC. It has an option for indexing the spindle. It has programmable digital inputs.
Is there a way to share the signal from the sensor between the VFD and Mach.
Thanks
Derek
-
Have a look and see if there is an output in the VFD for the revs, you may be able to configure an output to puit out a pulse every rev.
Hood
-
Actually I'm trying to go the other way. I need the optical sensor to signal the VFD so it can index.
It has a simple indexing function. The vfd shuts down then turns slowly till the sensor triggers. It pulls an input on the VFD low. It then turns to a programmed angle. I'm curious if I can just run the signal wire to the VFD and share it between the two
Thanks
Derek
-
Derek you run the risk of different voltages of the signals. Might want to consider a very small relay or electronic switch to separate the 2 signals.
Just a thought, (;-) TP
-
What I would try is using a Brain. as the index signal to the VFD will be at low revs then it might be ok.
Have the index signal go to Mach as normal then have a brain switch an output using the Index as a trigger, have the oput[put going to the VFD. Might not be good enough but not much hassle to try.
Hood
-
I have a pokeys to run the ATC if that would make things easier
-
I would have the index going into Mach via whatever you are using as the controller, ie parallel port or smoothstepper or.........
Hood
-
I'm using a parallel port. So if I run a wire from the parallel port to the input pin on the VFD are there any issues I should be aware of?
I'm worried my ignorance could be costly this time!
Thanks
Derek
-
I F you use the Brian approach consider an AND function with a led. That way you can turn the function on and off when needed. It keeps the brain from pulsing the output all the time.
Hood, Good call on using a brain to reroute the signal.
I would NOT wire anything direct to the LPT port I would run a GOOD BOB in between to isolate signals . IF you mistaking input 24v into your PC/BOB it could toast it .
Just a thought, (;-) TP
-
I would echo that, isolation is always a wise move.
Hood
-
Thanks for the help.
This gives me some food for thought.
Derek
-
Derek this would work to safely interface your rutex MB output to teh input of the VFD.
http://www.cnc4pc.com/Store/osc/product_info.php?cPath=24&products_id=273
(;-) TP