Dynomotion

Group: DynoMotion Message: 5797 From: dralk44 Date: 10/13/2012
Subject: VFD spindle control, Analog or Modbus
I will be using Mach3 for controlling my mill and I was wondering which would be a better control method for my VFD.

I can use either an analog signal from my kanalog board or modbus RS232/RS485. My VFD is a Teco 7300CV

I do plan to eventually trying and get rigid tapping working and was not sure which method would work better.
Group: DynoMotion Message: 5799 From: Tom Kerekes Date: 10/13/2012
Subject: Re: VFD spindle control, Analog or Modbus
Hi Wes,
 
You didn't include a link to your VFD manual.  I Googled and found this:
 
 
 
Is that your unit?  I didn't see any Modbus info.
 
I think Analog would be simplest.  Modbus is relatively slow.  Modbus from the PC would be indeterminate (You can't count on Mach3 or anything under Windows User mode to be real-time).  We do now have some ModBus routines that run in KFLOP but serial ModBus communication would always be slower than Analog commands.  If you want to do Rigid Tapping spindle position feedback is required (an encoder).  Does your spindle have an encoder?  I didn't see any encoder outputs on the VFD.
 
Regards
TK
 
 
 

Group: DynoMotion Message: 5800 From: Wes Carras Date: 10/13/2012
Subject: Re: VFD spindle control, Analog or Modbus
Hi Tom,

Here is a link to the page for my VFD.

http://www.factorymation.com/s.nl/it.A/id.5578/.f?sc=2&category=15367

I have this cable connected to my PC which allows me to configure the drive as well as monitor loads etc. I maybe misunderstanding the terms modbus and RS-232. I assumed that they worked together to control the VFD.

http://www.factorymation.com/s.nl/it.A/id.5580/.f?sc=2&category=15369

I plan to add an encoder to my spindle since it doesn't have one. Just looking for which method of control would be better for rigid tapping since I hate having to redo work later on. Only want to have wire my VFD one time.

I well just go with analog since that sounds like a better route.

Thanks
    -Wes

On 10/13/2012 6:27 PM, Tom Kerekes wrote:
 
Hi Wes,
 
You didn't include a link to your VFD manual.  I Googled and found this:
 
 
 
Is that your unit?  I didn't see any Modbus info.
 
I think Analog would be simplest.  Modbus is relatively slow.  Modbus from the PC would be indeterminate (You can't count on Mach3 or anything under Windows User mode to be real-time).  We do now have some ModBus routines that run in KFLOP but serial ModBus communication would always be slower than Analog commands.  If you want to do Rigid Tapping spindle position feedback is required (an encoder).  Does your spindle have an encoder?  I didn't see any encoder outputs on the VFD.
 
Regards
TK
 
 
 

From: dralk44 <wes@...>
To: DynoMotion@yahoogroups.com
Sent: Saturday, October 13, 2012 11:17 AM
Subject: [DynoMotion] VFD spindle control, Analog or Modbus
 
I will be using Mach3 for controlling my mill and I was wondering which would be a better control method for my VFD.

I can use either an analog signal from my kanalog board or modbus RS232/RS485. My VFD is a Teco 7300CV

I do plan to eventually trying and get rigid tapping working and was not sure which method would work better.

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