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Older VFD rpm adjustment

Older VFD rpm adjustment

Older VFD rpm adjustment

See if there are any old guys out there that are familiar with these. We have a few Roll threaders that have Allen Bradley 1336 Impact drives on them. We initially set them up with the motor rpms from the motor nameplate. We now would like to have it reflect the rpm of the spindle so the operator knows the actual speed at which the dies are turning, relatively. I went through the manual and tried a couple of parameter changes to see if I could filter, or offset, the readout. Not having any luck, so I then just went into the setup and changed the rpm of the motor nameplate to reflect what the spindle was spinning at. Seems to work, but I am worried there may be an issue with the vector control affecting the motor. Otherwise if you know how to offset the readout the right way, please let me know. The Fuji Frenic VFDs are pretty easy with the adjustment of the coeffecient. I guess technology seems to get easier and cheaper as the industry progresses, so this old stuff is just out of date, but still works well.

RE: Older VFD rpm adjustment

So.. You were able to get the drive to shut-up about the #&%@# frequency (Hz) but it was the wrong value?

Or, you can't get it to show anything else but the Hz so you've changed something so the Hz is equivalent to the speed?

Keith Cress
kcress - http://www.flaminsystems.com

RE: Older VFD rpm adjustment

Have you considered adding a counter type panel meter to display the motor RPM separate from the VFD?

RE: Older VFD rpm adjustment

I don’t think the 1336 had scaling of the display as an option. I have an old copy of the manual(s) at the office, if I remember, I’ll take a look on Monday. However changing the programmed motor base speed will affect the output torque because it affects the V/Hz ratio.

You may want to consider an update. 1336 drives have been obsolete for years now, in fact you cannot get parts to repair them any longer. That puts you are severe risk for extended down time if anything goes wrong. For a while, Rockwell offered incentives to trade up, but even those may have expired by now. It’s worth asking though.

" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden

RE: Older VFD rpm adjustment

Yeah, good point. I was thinking that same thought about a seperate rpm readout. I will wait and see if there are any difficulties in the thread rolling process. I figure it won't really show up until we run the larger diameter bolts. I did write down the other readouts, like the torque and amps and the like, before and after the adjustment, and they are pretty much the same. At least with this specific diameter, anyways. Yes, I have installed a newer drive on a couple of newer roll threaders that we bought after these other ones. The Frenic Mega. It works well and I can easily adjust a parameter to get the rpm I want. I'm just trying to keep costs down. Let me know what you come up with on the manual jraef. I have a hard copy and I was looking at the Ptrim? I'm at home now and don't have the manual in front of me.

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