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

lol That's ok inventor, but I'll be given the misses your name, you may have some explaining to do

What I don't like about using that E/stop is that you must use the motor braking. If you set it to short you are putting wear and tear on things every time you stop. If you set it long so that is stops slowly in an emergency it will drive the spindle at full power during ramp down(on a lathe it will drive the power feed as well). On machines of this size I prefer free run stop, except for special cases like threading to a shoulder. Having said all that I most likely have my ramps to long.

For a real E/stop, I think you need a brake.

Would I wire my machines up like that? Maybe, in the short term. I'll have to have more of a think about that.

Stuart

I would suggest that if you want to have an E/Stop that it goes Line Side and drops power to VSD, commom industry practice, it would be in keeping with E/Stop Categories.
If you want to bring the Motor to a quick stop then E/Stop Category 2 would apply where a Failsafe Controller would signal the VSD which would have separate input to bring the Motor to a quick safe halt then the Failsafe Controller would issolate the circuit.
I attach a diagram I did for a VSD Circuit which is very similar to what I feel this circuit woud be.
As this is a domestic installation the normal Standards that would apply to Industry are not manditory but I think you should consider them as they are there to ensure safety to operators of the equipment.

Regards,
Keith.

Thanks Keith, I will study the drawing today. thanks for posting it.

Keith,
Can you fix the wire that goes from T1 to 5. It upset my eyes

Stuart

Keith and Stuart,

I have played around with the drawing, trying to add a jog function that can operate in both FWD and REV.
Not knowing enough about how the 'software' of the unit overrides the external inputs I came up with the first drawing ( the wire should ideally go onto terminal 6 'SP1' instead of how it is shown on terminal 7 'RST')
it also uses a n/c contact ( of the jog button) in the 'normal' supply.
But, then I realized that perhaps it would be better to use the n/c contact to open the relay, totally. So that if you happen to push the jog button while the motor is running the motor would permanently stop running at the selected 'normal' speed and run at the jog speed while ever the jog button is held in.

Do I have this correct, or is it totally rubbish/unnecessary?

In a 'domestic' situation you could prossibly use a switch instead of the contactor ?

invertor,
Terminals 6 and 7 are pretty much interchangable.
I don't understand why you have added so much. You just need a SPST from 12V[5] to SP1[6](or RST[7]), if the switch is closed the VSD goes to jog speed(or sp1 depending on software settings), if its open it runs at "normal" speed. Am I missing something?
Stuart

Hello Stuart thanks for the response. I was assuming that you first have to hit the start button, then the motor runs at the selected speed and then if you push the jog button it would either speed up or slow down to the set jog speed.

Or does the pot control the speed of the jog as well? ( up to the frequency that it is set) I don't know!

Then when the jog switch is released it would go back to normal speed, which depending upon the application, could be unwanted.
I was assuming that it might be 'safer' to have to restart the normal speed mode after the jog has been used.

Does that make sense?

I need a icon with a puzzled face

"I was assuming that you first have to hit the start button" No, you can switch jog on before or after the motor is running.

"Or does the pot control the speed of the jog as well?" No, regardless of the setting on the pot speed control the jog speed overrides it(slower or faster)

"Then when the jog switch is released it would go back to normal speed, which depending upon the application, could be unwanted.
I was assuming that it might be 'safer' to have to restart the normal speed mode after the jog has been used."
Could be I guess. You might be able to use a DPDT center off switch, but I'll have to think a little more about that.

Stuart

Stuart, if there is only a spst switch for the jog ( as you mentioned in your earlier post. And the fwd/reverse switch is set to either one. Then, if you select jog ( without hitting the start button), doesn't there need to be 12v connection to the fwd/rev switch?

If you only want to jog the motor without actually starting it to run at normal speed but need to select what rotation it goes in.

Oh ok now I see what you are trying to do.
I think what you are trying to do is better described as "inching" rather than "jogging", but maybe I am playing word games.

I have no idea what the VSD would think of that. Although I guess the guy you linked to is getting away with it.

I think you might be better off forgetting about it for the minute and just using the speed pot. Is there a reason you think you want inching? There is a way of inching with the current switch setup up but I am sure it would be frowned upon

Stuart

Hello Stuart, yes I guess I was thinking of inching, where you might want to have a preset speed that you can select for various operations. And I thought if it is easy to add then it would be a nice feature, but I think it would be good to be able to have it fwd and rev.
Now that you and others have so kindly helped me, I will start trying a few options.
Do you find its best to connect all of the control wiring in shielded wiring? with one end grounded (I will be enclosing the VFD in a metal enclosure and using shielded cable to the motor)?

I've only done one VSD although not a standard one. I have used cat5 cable for all my controls. No shielding on the motor cables so AM radio is out while the VSD is turned on. So I can't really comment.

Stuart

Originally Posted by INVENTOR

Do you find its best to connect all of the control wiring in shielded wiring? with one end grounded (I will be enclosing the VFD in a metal enclosure and using shielded cable to the motor)?

Hi Inventor,

I would have contributed a bit more to this thread a little earlier but I've been away on a job. But I see Stuart has you heading in the right direction anyway!

No real need to shield the control cables, if you already have shielded cable then by all means use it. However you should keep the control cables away from the vfd output to the motor. Try not to have long parallel runs with the power cabling.

The power cable from the VFD to the motor, however, does needs to be shielded for EMI supression.
Having said that, I have just orange circ on mine ... but my excuse is I'm going to re-do it when I do the CNC stuff.

Regards
Ray

Hi INVENTOR & Stustoys,
I attach an update on the circuit diagram where I have put a Rotary Pushbutton NO with a feed from Terminal 5 to Terminal 6. This would when closed set the Frequency to the set SP1 Frequency as I see it from the Manual, but I could be wrong.
I fixed the colour from Terminal 5 for you Stustoys, dont want to upset your eyes.

Regards,
Keith.