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Author Topic: Using a spindle sensor for Mach and VFD  (Read 3507 times)

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Offline derek

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Using a spindle sensor for Mach and VFD
« 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

Offline Hood

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Re: Using a spindle sensor for Mach and VFD
« Reply #1 on: November 18, 2012, 11:18:22 AM »
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

Offline derek

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Re: Using a spindle sensor for Mach and VFD
« Reply #2 on: November 18, 2012, 11:30:59 AM »
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

Offline BR549

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Re: Using a spindle sensor for Mach and VFD
« Reply #3 on: November 18, 2012, 11:37:21 AM »
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

Offline Hood

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Re: Using a spindle sensor for Mach and VFD
« Reply #4 on: November 18, 2012, 11:41:54 AM »
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

Offline derek

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Re: Using a spindle sensor for Mach and VFD
« Reply #5 on: November 18, 2012, 12:04:10 PM »
I have a pokeys to run the ATC if that would make things easier

Offline Hood

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Re: Using a spindle sensor for Mach and VFD
« Reply #6 on: November 18, 2012, 12:11:13 PM »
I would have the index going into Mach via whatever you are using as the controller, ie parallel port or smoothstepper or.........
Hood

Offline derek

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Re: Using a spindle sensor for Mach and VFD
« Reply #7 on: November 18, 2012, 12:47:31 PM »
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

Offline BR549

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Re: Using a spindle sensor for Mach and VFD
« Reply #8 on: November 18, 2012, 01:07:07 PM »
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

Offline Hood

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Re: Using a spindle sensor for Mach and VFD
« Reply #9 on: November 18, 2012, 01:17:52 PM »
I would echo that, isolation is always a wise move.
Hood