Relay Logic Elevator Controller Using VF Motor Drive

Popular project, this 5-stop elevator.

Have a look at previous: Here and here.

It looks like you may have posted at one of these already. Did you read the thread? If it was not you, please review them both for ideas.

I have seen those sir, what I need is a relay logic with automatic doors,selective-collective, using VFD motor drive. Thanks

Have you written at least a part of the ladder logic? Can you show us?

Even if not using a PLC, this will be useful.

Given the frequency with which this comes up I think this is part of some class work assignment; elevator mfrs stopped using relay controls years ago. Please don't help students do their homework, it encourages them to be lazy.

And don't bother claiming you are not a student. If you are someone qualified to be engineering a control system with a VFD in it, relay ladder logic would be the least of your concerns. If you are unable to figure out such a simple logic scheme or interpret what has already been shown to you, you have no business doing this at all!

Hello JRaef.

Oh, I agree this is classwork of some type. Please note I have given him (her?) no real answers, only attempted to steer him to clearer more complete thinking.

Having had some experience with uninspirational instructors, I see nothing wrong with prodding someone down the path of inspired thought. Like you, I never very seldom give full answers to this sort of thread; that would, indeed, promote or reward laziness.

We've had some engineering students get really demanding about getting their answers, I like to respond that they must be more suited for management than engineering, because engineers want to learn how to do things, managers want to learn how to get other people to do things.

That is well said, JRaef.

What about you, cocoy sangalang. Are you engineer material?