Author Topic: A way to control the direction on VFD  (Read 616 times)

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Offline lukejenson

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A way to control the direction on VFD
« on: May 12, 2018, 05:41:04 PM »
I have a -10V to +10V signal from a device which I would like to control a AC Tech VFD with https://www.clrwtr.com/Products/ESV751N04TXC.

I want at -10V the motor to reverse & at +10V the motor to go forward. At 0V the motor should stop.

Can this be done?

Offline garyhlucas

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Re: A way to control the direction on VFD
« Reply #1 on: May 12, 2018, 06:37:43 PM »
Looking at page 35 P159 mentions +-10v, but P158 above says it is not currently supported. No wiring diagrams show it either so I believe you are out of luck.

Offline joeaverage

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Re: A way to control the direction on VFD
« Reply #2 on: May 12, 2018, 07:51:05 PM »
Hi Luke,
just as a matter of interest why do you want it to go backwards? Do you have LH cutting tools or LH drills?

Craig
My wife left with my best friend...
     and I miss him!

Offline garyhlucas

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Re: A way to control the direction on VFD
« Reply #3 on: May 13, 2018, 10:06:34 AM »
Tapping?

Offline joeaverage

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Re: A way to control the direction on VFD
« Reply #4 on: May 13, 2018, 11:35:58 PM »
Hi,
yes tapping, but VFD driven spindles have such poor torque at low speed that it doubtful it will work
unless its a really big spindle. Additionally you'll need some sort of encoder to synchronise with the
other axes, and position control with asynchronous spindles is fraught at best.

Craig
My wife left with my best friend...
     and I miss him!