Recent content by data74

Why is it better to measure KW and not amps when comparing to similar motors driving the same load? P= V*I*cos(phi) I thought that both would pick up the imbalances.

Thanks for the Info Forumees

Yes you are right, the proxies will pick up the Lower speeds better but at higher speeeds there were some significant discrepecies. Will send details of the original arrangement with proxies on each side of the clutch.

Thanks for that Guys. Here is some more info open to discussion. 1. E3's are not accurate for frequencies less than 20HZ 2. Idea of using proxy switches has failed, they are too slow to pick up the speed differences 3. We still need to confirm the calibration of the curent measurement....compare...

Unfortunatetly i can't install any hardware i.e tachometer/ encoder. The only option i'm left with is maniplating the code to be able to pick up the difference in the Individual line currents......I was thinking of using an S-curve or something like that??

Hi Guys I've got a machine with 3 * 37kW motors driven from one VSD driving one gear wheel, Each motor has an Individual MCB and an AB E3 O/L for protection, also before the gearbox is a fluid filled clutch. We tried to detect clutch slippage using proxies but they were not quick enough to...

Does anyone out there know of any installations that have succesfully implemented and ethernet based control system for MCC's. I am looking at options of implementing a system with 100 11kW motor starters and get rid of control wiring????

Is it possible to view a rslogix5000 v17 in a pc that runs v16?

Our process is a pulp and paper in Southern africa. Is the plc option out of the question???

We have a bailey system running close to 7000 tags on site. We intend to replace it as it has close to 12 years worth of support.Anyone out there has gone through the same process?? I have two ideas in mind: 1. Change to clgx plc 2. Install an ABB interface to the current system.....preferably...

Thanks everyone, i've sent a request to Brush for a relay setting sheet.....i know it will cost a bit of $$$$ to get the archives.

I'm making an effort to edit the settings of the MultiLin489, How does one determine the synchronous reactance? i require this in order to determine the settings for the MoH circles?? The machine name-plate gives a value of 0.8 for the power factor.....is this the optimal power factor under FL...

Thanks for that info Scotty, will certainly do some research!

Any Generator Protection Guru's out there? We are using a MultiLin489 relay to protect this generator.....the generator is not earthed i.e (Floating).What categories of protection do i require??

Anyone out there with Bailey inFi90 system?? I need haradware & software reading material....even snap shots of example programmes.