Thread: Help with wiring a teco fm50 vfd !!!

Originally Posted by INVENTOR

Ideally I want to operate the VFD with momentary style Start/Stop , Forward and Reverse ( selectable switch) and perhaps jog function ( at least in forward direction)

Hi,
I dont believe this is possible. You need to either use a latching relay or a normal switch.
I haven't heard of a CD either.
There are a lot of different ways to wire these things up. Some like one way, others like another way.

Stuart

Hi Inventor,

What sort of machine is it?

Simplest wiring is a forward/off/reverse switch and a pot for speed control. That's all you need. (actually you could eliminate all the external wiring and switches, and just use the keyboard, but I don't think that's what you had in mind)

As Stuart says, the inputs to the drive are level sensitive, if you want edge triggered (momentary switches) for fwd/rev, then some external circuitry will be needed. Could be as simple as a latching relay, or as complex as you like. Depends on what you want to do.

Sorry, that's not more help, but it might help clarify the question.

Regards
Ray

Why not try another manufacturer's more detailed manual, in case it reveals more of the underlying logic.

For example, the ABB manual for the ACS350 drive (hope this link works)
http://www.google.com.au/url?sa=t&so...JTXqyA&cad=rja

Inventor,

In case you missed it, there was a post a short time ago re wiring up a VFD to an Arboga mill.

Right at the start of the post, is a diagram showing a remote control pod hooked up to a VFD.

The VFD in this case is a Teco unit modified to run a 415 3-phase motor, from a 240V 1-phase supply. This aspect should not be a concern to you.

If your operating instructions are anything like mine, you will find a wiring diagram for FWD STOP REV SPEED. Forward, stop and reverse is a 3-position switch. Speed utilises a 10K linear pot.

The post is here.
https://www.woodworkforums.com/f65/wi...a-mill-132429/

Stu can probably advise on setting up the parameters.

Ken

Hi INVENTOR,
If you dont have the Manual for the FM50 you can download from Teco's web site. The wiring diagran on page 15 shows that you need a maintained contact for the Multi Function Inputs, so if you want to use Push Buttons you would need to use a Relay to acheive this. As you have an Electrical Background this would be easy for you to do, if you are unsure I could draw a Circuit for you.

Regards,
Keith.

Thanks all, for your responses thus far. I will be wiring the unit on the test best thus far with the intention of using on a lathe ( that doesn't have any controls).
So I would like to replicate the usual set up on 'sa'y a metal lathe where the 'soft touch' control doesn't rely on remembering to switch 'certain switches' into appropriate positions all the time.

I do want to add extra control switches in the circuit for extra stop buttons etc.

I do have the manual, but it is not very good.
I have found various schematics from the web, I will try and post one or two for comment. they used the multifunction inputs without the need to employ relays, but I would value extra comments, before I go wiring it up.

Originally Posted by INVENTOR

. they used the multifunction inputs without the need to employ relays,

You could make a solid-state (do we still use that word?) circuit to get rid of the relay, but there has to be some form of external latching if you want soft touch controls.
Look forward to your schematics.

Stuart

Thanks for the reply Stuart. I think that I would probably feel 'easier' if I set the unit up with external relay/s but I am still very intrigued how people can wire these units using its own settings etc. given that I have the unit on the bench and using a spare motor, I feel like trying a few options, to learn how they work.
here is one post I found , also see attached files

TECO FM-50 Setup on Hendey Lathe - Practical Machinist - Largest Manufacturing Technology Forum on the Web

What I don't know ( a lot, I know) is how the separate 'functions' work eg: if you use a conventional switch for the on/off can you effectively also incorporate the jog control ( referring to the drawing)
Also for my ideal set up, I would want to be able to run in reverse in both 'normal' and jog mode.
Without wasting too much of your time, is it worth following some of these types of circuits ( and function settings) or better to add an external relay?

The on/off switch isn't momentary so there is your latching.
I don't like using that E/stop system(but that's a personal choice, I don't like that you have to make a circuit to stop the lathe)
You cant run the lathe in REV except at JOG speed.
The jog circuits(there can be up to three) are separate from the FWD/REV circuits. They lock the drives Hz. You then use the FWD/REV how ever you please.
I would wire it a little differently, I'd draw what I think you have in mind.

Stuart

Here you go. I had to do it it paint so the switches are the press I could do.

Hi, Stuart, that was fast. yes as you say the on/off switch in spst. If you don't set up the emergency stop as he has shown ( i like your thinking) then how do you suggest to wire up the stop contact/s?
With the circuit you have drawn, does the VFD know to reduce down to jog hz when the 12volts is applied to the SP1 terminal? ( eg: over-rides the 'normal' speed setting) and/or do you have to set the fwd/reverse switch to 'off' before hitting the jog?
It is this part that has me unsure. the way I read the manual, it doesn't spell out which (if any) functions take precedence.

Thanks heaps, I am learning a lot.

Originally Posted by INVENTOR

Hi, Stuart, that was fast. yes as you say the on/off switch in spst. If you don't set up the emergency stop as he has shown ( i like your thinking) then how do you suggest to wire up the stop contact/s?

Sorry that drawing was if you planned to include his stop circuit. If you plan on using that as your normal stop button I don't have so much of a problem with it. Its when it is used as an E/stop I have issues with it.

Originally Posted by INVENTOR

With the circuit you have drawn, does the VFD know to reduce down to jog hz when the 12volts is applied to the SP1 terminal? ( eg: over-rides the 'normal' speed setting) and/or do you have to set the fwd/reverse switch to 'off' before hitting the jog?

Never tired it. I assume in will go to jog speed even if running, I'll check and get back to you.

Originally Posted by INVENTOR

It is this part that has me unsure. the way I read the manual, it doesn't spell out which (if any) functions take precedence.

For the speed control the precedence is on page 35 of my manual(who knows in yours) It goes Jog > SP1 > keypad setting or external speed pot.
BTW
1. If you are using the E/stop circuit you can only have one jog speed. No biggy if you have speed pot anyway.
2. As the jog speed has precedence the speed pot has no effect once jog is switch on

If you use the stop function ( as shown in his drawing) as your main stop ( as I guess you can simply add numerous stop switches eg: knee bar/ door lockouts etc in series) to the circuit BUT, how do you achieve a 'real' Estop?
Am I correct in saying that VFD's don't like being isolated from the incoming supply while under load? ( eg: if you were to use a main isolating Estop switch 'external' to the VFD)

I know you don't use any switches etc between the motor and VFD.

Wow, I am asking a lot of questions, but so much to learn.

I try tried the jog circuit while the machine was running. It slows(or speeds up, now that could be a trap) to jog Hz and the returns to the prior speed setting once jog is removed.

As far as E/stops go. I have a foot pedal as the stop. That's what I always use and that's what I feel I will go for in an emergency. I don't like to have another E/stop as you wont go for it first anyway. But there are wildly differing opinions on this.

Stuart