Allend Bradley PowerFlex 755 VFD, analog output.
- Thread starter Elcan
- Start date
jacoffey85
Member
Is that a screenshot of the PowerFlex 755 manual? If so, could you post the link or upload it?
Thanks!
You can get your very own copy here.
http://literature.rockwellautomation.com/idc/groups/literature/documents/in/750-in001_-en-p.pdf
I had that one. I meant the one used in the screenshot.
The closest I got was the parameters for a 753.
jacoffey85
Member
This is the one I pulled the screenshot from (pg 249):
http://literature.rockwellautomation.com/idc/groups/literature/documents/pm/750-pm001_-en-p.pdf
As far as I know, the 755 has the same available parameters as the 753 plus a few extra for added functionality (noted in the PDF).
alan_505
Lifetime Supporting Member
One of the main differences between the PF753 and the PF755 is that the PF753 has analog on the main board.
To get analog on the PF755 you must use a option board, the parameters will be the same as teh above screenshot but will have different parameter numbers.
Alan
To get analog on the PF755 you must use a option board, the parameters will be the same as teh above screenshot but will have different parameter numbers.
Alan
jraef
Member
Correct. And there is only one manual for both versions. The reason you can't find info on programming the analog output on a 755 is because there are no outputs at all on the bare drive, only one digital input. All othe I/O is added with cards and the programming of those cards depends on which slot you plug them into.
This explains my confusion!
As a side note, for me it does not make sense that a high end VFD doesn't have analog outputs on board. That's why I prefer ABB!
jraef
Member
Different markets. ABB is not in the networked control business in the same way A-B is. Sure they have it available, but no market share for controllers, so they have to make theirs adaptable to other control systems, which isn't as easy to implement.
The 755 is INTENDED to be used as a network connected drive connected to A-B controllers. So your desire for an analog output is in conflict with the person using it as a network connected drive and saying "Why do I have to pay for all this I/O that I never use?" If you want I/O on the drive, you select the 753.
Very good explanation, thank you!
I like ABB for little things like a Local/Remote button, 3 line Advanced display, and also for good price, quality and free tech support.
My intention was not to start a ABB Vs AB debate, though.
jraef
Member
With a few* exceptions, anyone succeeding in the worldwide VFD market is making good products. There is room for everyone and a flavor to suit whatever you are looking for.
* Ultra-cheap bottom-feeder products sold on FleaBay and other web portals are the exception. They continually change their names or don't even bother using a brand name to avoid association, because they rarely sell to the same person twice.
* Ultra-cheap bottom-feeder products sold on FleaBay and other web portals are the exception. They continually change their names or don't even bother using a brand name to avoid association, because they rarely sell to the same person twice.
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