Created Date: June 13,2010

Created by: milldrone

vf816,

The most common way to do what you want is to designate one drive as the master. If this were a series of conveyors I would use the last one as the master. The master will be controlled by the speed pot. Then take the analog output from the master and feed it to the next drive's analog input. So on and so on. If any speed tweaking needs to be done there is usually an analog gain that can be adjusted to make things right.

Created Date: June 13,2010

Created by: vf816

Thanks for the advice.I was not sure if it could be done with out over loading the primary speed control.I have a filler with infeed and out feed conveyors,and i want them to follow the speed of the filler.I hope it Helps to keep the bottles from trying to jump out of the conveyor.when we run at lower speeds they tend to twist up. because i need to have them running fast enough to keep up with the filler when we get to speed.so if I take the anolog output from the filler and series it to the conveyor drives that should work.

Thanks

Created Date: June 14,2010

Created by: KPrice

Another suggestion: Use a PLC with a 4-20ma input module and a pot signal conditioner to read the master pot. And use 4-20ma out module(s) to send the speed signals to the VFDs. You could check on possible communication capability. But with the different make VFDs, it might be simpler to use 4-20ma signals than communications. Use a C-more to display input/output signals and allow hand/off/auto switches and numeric entries for testing. I tend to want to solve everything with a PLC, depending on your requirements, a DL06 or DL205.