Emerson Exchange 365

COMM-D / PowerFlex 70 VS 753 Device Net Programing Problem

I am having an issue adding one of our VFD's to device net. For our powerflex 70's we use the COMM-D adapter. for our PF 753's we use the  20-750-DNET adapter. I was able to successfully map out all the I/O's on our PF 70 using the Comm-d manual (Appendix D) except the start and stop command.  With our 753's we map the DST as follows,

Output, Boolean

First Bit - 2

Used Bits - 1

Byte Offset - 2

With this configuration we are able to start and stop the motor/pump using only one DST. When I try this with out PF 70's it dose not work. Looking at both manuals I believe the command start/stop I/O is the same. Can anyone shed some light on this?

Thanks,

Tom

• Device Net
• VFD

Thomas McGreevy

• 15 Jun 2021 1:52 PM
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5 Replies

• Casey Houchens

  

  • 16 Jun 2021 10:10 AM

  I believe that the issue might be that bit = 2, byte offset = 2 on the PowerFlex 753 is the RUN bit, but byte offset 2 on the PowerFlex 70 is actually the speed command word.

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• Thomas McGreevy

  

  • 16 Jun 2021 4:32 PM

  In reply to Casey Houchens:

  Thanks for the reply.
  
  Do you have any idea what I should be trying for the PowerFlex 70

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• Casey Houchens

  

  • 17 Jun 2021 10:18 AM

  In reply to Thomas McGreevy:

  For the PowerFlex 70, I believe that you may need to use two bits to Start/Stop the drive (3-wire control).
  Byte Offset = 0, Bit = 0 is the STOP command.
  Byte Offset = 0, Bit = 1 is the START command.
  The PowerFlex 70 manual states that the "Start will not function if a digital input (parameters 361-366) is programmed for 2-Wire
  Control (option 7, 8 or 9)," so you will need to check the programming of your digital inputs.

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• Matt Forbis

  

  • 17 Jun 2021 1:32 PM

  In reply to Casey Houchens:

  Agree with everything Casey says. One more item to check on a PF70 is the Start Mask (param 277) to make sure it's setup to allow starting from Ethernet IP.

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• Thomas McGreevy

  

  • 21 Jun 2021 2:37 PM

  In reply to Matt Forbis:

  Okay, Thank you both. I was able to get it working this morning after using two bits.
  
  Thanks again,
  
  Tom

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