Dynomotion

Group: DynoMotion Message: 1828 From: morgtod Date: 9/26/2011
Subject: VFD 0-10volt isolation
What is the best way to isolate the VFD 0-10 input signal from the system ground? Most of my VFD manuals say do NOT ground the negative input signals. A DC/DC converter of some sorts???
Todd
Group: DynoMotion Message: 1829 From: Tom Kerekes Date: 9/26/2011
Subject: Re: VFD 0-10volt isolation
Hi Todd,
 
I don't know of an easy way.  We are designing a new board with an isolated analog output created from a KFLOP 3.3V PWM signal.  We tested this circuit and It seems to work well.
 
 
Regards
TK
 
 

Group: DynoMotion Message: 1830 From: morgtod Date: 9/26/2011
Subject: Re: VFD 0-10volt isolation
I'll take a couple when they're ready.
todd

--- In DynoMotion@yahoogroups.com, Tom Kerekes <tk@...> wrote:
>
> Hi Todd,
>  
> I don't know of an easy way.  We are designing a new board with an isolated analog output created from a KFLOP 3.3V PWM signal.  We tested this circuit and It seems to work well.
>  
> http://dynomotion.com/Software/Circuits/IsolatedPWMtoAnalog.png
>  
> Regards
> TK
>  
>  
>
> From: morgtod <todmorg@...>
> To: DynoMotion@yahoogroups.com
> Sent: Monday, September 26, 2011 4:35 PM
> Subject: [DynoMotion] VFD 0-10volt isolation
>
>
>  
> What is the best way to isolate the VFD 0-10 input signal from the system ground? Most of my VFD manuals say do NOT ground the negative input signals. A DC/DC converter of some sorts???
> Todd
>
Group: DynoMotion Message: 1831 From: karmannelectric Date: 9/27/2011
Subject: Re: VFD 0-10volt isolation
Please check out the files referred to in this link:

http://finance.groups.yahoo.com/group/geckodrive/message/9200

Very similar to your schematic, heck even includes gerber files.
- Steven Ciciora


--- In DynoMotion@yahoogroups.com, Tom Kerekes <tk@...> wrote:
>
> Hi Todd,
>  
> I don't know of an easy way.  We are designing a new board with an isolated analog output created from a KFLOP 3.3V PWM signal.  We tested this circuit and It seems to work well.
>  
> http://dynomotion.com/Software/Circuits/IsolatedPWMtoAnalog.png
>  
> Regards
> TK
>  
>  
>
> From: morgtod <todmorg@...>
> To: DynoMotion@yahoogroups.com
> Sent: Monday, September 26, 2011 4:35 PM
> Subject: [DynoMotion] VFD 0-10volt isolation
>
>
>  
> What is the best way to isolate the VFD 0-10 input signal from the system ground? Most of my VFD manuals say do NOT ground the negative input signals. A DC/DC converter of some sorts???
> Todd
>