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Author Topic: How to use 0-3.3 volt analog output to control 0-10 Volt VFD ?  (Read 9452 times)

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I don't know what circuit or device to use to interface the Pokeys analog output to a 'standard' VFD. The VFD requires 0-10 Volts to go from stopped to full speed.

Thanks in advance !

CNC4PC has a model C14 0-5 volt converter which can deliver a output of 0-10 volts  , (For only $12.28) , but my pokeys unit only goes to 3.3 volts ?

« Last Edit: August 13, 2009, 09:48:13 AM by RadiantHeat »

Offline borisz

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Re: How to use 0-3.3 volt analog output to control 0-10 Volt VFD ?
« Reply #1 on: August 13, 2009, 10:49:14 AM »
Hi!

Ask Arturo from CNC4PC what should be changed for 0-3.3V input.

regards

Boris
www.poscope.com home of PoKeys USB HID, IO, USB, Ethernet controler and PoScope USB PC oscilloscope

Offline poppabear

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Re: How to use 0-3.3 volt analog output to control 0-10 Volt VFD ?
« Reply #2 on: August 13, 2009, 07:33:59 PM »
if you VFD (check you programming manual), it may have an Analog Offset that you can scale to the 3.3

scott
Commercial Mach3 & Mach 4, Design/Build/Retrofit CNC and Industrial machines.
http://www.ss-systems-llc.com/
Re: How to use 0-3.3 volt analog output to control 0-10 Volt VFD ?
« Reply #3 on: August 18, 2009, 05:51:19 AM »
Just a small-signal PNP transistor with a 10-12 volt external power source should do the trick. NTE 59 or equiv. should do it.

Offline borisz

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Re: How to use 0-3.3 volt analog output to control 0-10 Volt VFD ?
« Reply #4 on: August 18, 2009, 06:14:54 AM »
Transistor is not linear at it ewill not do the work correctly.


CNC4PC has a model C14 0-5 volt converter which can be adjuste for 3,3 V.
www.poscope.com home of PoKeys USB HID, IO, USB, Ethernet controler and PoScope USB PC oscilloscope