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

I'm pretty sure it can be, just a question of how much rewiring needs to be done and if extra switches are needed. That depends on what you have now.
We'll see soon enough

Stuart

Ok I wired it up like you said and it works with inching switch but in fwd it goes the speed of jog that is programmed and rev is full speed. Start up ramp(accel time) is .7 sec.

At a guess it sounds like you need a double pole jog switch.(it likely is double pole)
Or you may need to add another switch.
I can't really say more than that until I've seen what you have and how its currently wired as I assume you want it to be able to jog in reverse as well.

If you only want it to jog FWD and the jog button is double pole, wire one pole 12V to FWD and the other pole 12V to SP1.

Stuart

p.s. A question for those in the know. the 12V on these VSDs, is it AC or DC?. i.e. could you remove the need for the double pole switch by fitting a diode?

Not really following the double pole bit. Could post a drawing?

I think wiki has explained it better than I could.
DTST(double pole single throw) "Equivalent to two SPST switches controlled by a single mechanism"

Switch - Wikipedia, the free encyclopedia

AT a guess. If you have FWD and SP1 wired to a single pole of the jog switch, when you try and run the lathe with the other switches those wires are connecting FWD and SP1 so it only runs at job speed. If you put them on seprate poles that cant happen.

Stuart

Originally Posted by Stustoys

p.s. A question for those in the know. the 12V on these VSDs, is it AC or DC?. i.e. could you remove the need for the double pole switch by fitting a diode?

Hi Stuart,

It's DC, I've been meaning to try and contribute something to this thread, but things are a bit crazy around here with work at the moment.

If I get a chance I'll have a look a the the Teco on the Mill tomorrow and see if I can draw a circuit.

Regards
Ray

So a diode would work then? Not sure I like the idea but as a failed diode would make the machine run slower or not at all I guess its not so bad if the switch turns out to be hard to replace.....

Stuart

Put a 3 amp diode I had kicking around between Fwd and Sp and now it all works properly! Thanks Guys. On another note what enclosures are you all using or should I bother? Worried about grinding dust etc.

Good to hear its sorted.

Originally Posted by 2rods

On another note what enclosures are you all using or should I bother? Worried about grinding dust etc.

I'm having the exact same issue ATM, two of my VSDs are on grinders, I've been thinking about boxes with car air filters. Though given they are 2.2kW drives and 2hp or less motors I have been thinking about pulling them in a steel box and see if they trip............but that seems just a little rough, even for me.


Stuart

I am wondering about an old computer case. You could block the back off for wiring and a filter and maybe cut out front or make a new faceplate so front of vsd is visible and accessible to program. Those enclosures are expensive.

Hi Stuart, Gerry,

You can get away without having air vents if the heat dissipation from the enclosure surface is large enough to provide cooling.

Or just the heatsink on the back, like this.




Regards
Ray

Yeah the heatsink comes out the back on my Teco (I'm pretty sure). But not on the cheap ones. I also wish the fans on the cheap one didnt run when the output was off. As you can see all my problems are large lol

Stuart

Should the VFD be left powered up or is it Ok to cut the power to it if not in use? Do they consume any power when left on? Thanks

Anyone?