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Author Topic: A way to control the direction on VFD  (Read 171 times)
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lukejenson
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« 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?
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garyhlucas
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« 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.
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joeaverage
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« 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
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garyhlucas
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« Reply #3 on: May 13, 2018, 10:06:34 AM »

Tapping?
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joeaverage
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« 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
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