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Thread: E-stop and Teco VFD's
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16th April 2011, 10:27 PM #1Product designer retired
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E-stop and Teco VFD's
For those new to the forum, I purchased a special Teco VFD from Drives Direct in the UK.
When I say special, the VFD is a standard unit modified to run from a 240V 1-phase input, and have a 415V 3-phase output.
The question of E-stops has come up from time to time, so I dropped Drives Direct an email, it reads as follows
Hi Dave,
Recently I purchased a 240V 1-phase to 415V 3-phase 1 HP VFD for my Arboga milling machine.
My question is where to install an E-switch?
I know that there can be no interruptions between the VFD and the motor, so that only leaves the 240V line in, or is there another way?
Kind regards,
Ken
And his reply
Hi Ken,
YES there is another way, if the ES switch had a normally open contact then just connect it between the 12V and SP1 terminals of the inverter and set up the function of SP to ES with the DSP FUN function,
If the ES is normally closed(the normal way) you can still do this with the addition of a 1K resistor, connect the resistor between the 12V terminal and SP1 and the ES switch should be connected between SP1 and 0V and that will then work fine,
The software setting parameter is F19 and that need to be set to a value of 3,
I hope this helps,
Many thanks
dave.
Stu, does the above make sense to you, I'm a bit confused.
Ken
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16th April 2011 10:27 PM # ADSGoogle Adsense Advertisement
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17th April 2011, 12:22 PM #2.
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KJ,
Why don't you hook up the VFD to the mill and at least see if everything works as it should before you start finessing with the controls? You'd be spritely enough to leap out of the way if things turn bad. Just remember to roll the sleeves of your cardigan up.
BT
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17th April 2011, 02:44 PM #3
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17th April 2011, 02:47 PM #4Cliff.
If you find a post of mine that is missing a pic that you'd like to see, let me know & I'll see if I can find a copy.
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17th April 2011, 04:33 PM #5Product designer retired
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Thanks Cliff,
I was hoping Drives Direct would suggest putting an E-stop in the 240V line in, but they didn't.
To me, this would seem logical. An E-stop here would kill everything.
Ken
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17th April 2011, 04:38 PM #6GOLD MEMBER
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Ken,
That's a neat trick, both his answer and getting an answer from him
Chris,
Your explanation is about how to us a NO E/stop circuit, adding the resistor lets you use the more normal NC E/stop circuit(of course if the 1kresistor fails you're stuffed).
Stuart
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17th April 2011, 04:48 PM #7Product designer retired
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Stu,
I agree. In a preceeding email from Drives Direct, they say they have just moved into their new premises. How long's that been, 12 months?
Nice to see the service has improved dramatically.
Ken
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17th April 2011, 05:24 PM #8
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17th April 2011, 07:36 PM #9Product designer retired
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Thanks Greg,
I obviously don't know how VFD's work. I assumed that if you shut down the power, the motor would come to fairly hasty stop.
Maybe an even dumber question, is an E-stop or red schidt button, really necessary?
Ken
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17th April 2011, 07:36 PM #10New Member
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Are you sure you have a 240v 1phase to 415V 3phase and not 220v 3phase?
You should have forward-stop-reverse buttons on your VFD, usually the forward and reverse is a closed contact and stop is open, it is on mine. You can use a SPDT center off switch.
You can setup the start for soft start and the stop with quick braking. I like a quick stop in case of emergencies. Although on my first setup for quick stop I did not realise my large 4 jaw chuck was not on tight and when to VFD pulled up quick the chuck nearly spung off. lol
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17th April 2011, 07:48 PM #11New Member
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You can adjust the stopping speed by programming
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17th April 2011, 08:05 PM #12
I think that installing an e-stop is like a dog _______ his ____. He does it because he can.
I don't have an answer for you on that. Current standards would require one if you were going to install a machine commercially I think. How much of that is relevant is up to you. Myself...I jabbed myself in the eye once with a cotton ball. Do the maths...
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17th April 2011, 08:52 PM #13Product designer retired
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Greg,
Good point. I sometimes wish my tongue was that long, if only to lick my eyebrows.
Ozengines. Oh yeah, my VFD is definitely 240V in to 415 out. As mentioned above, it's a special.
AB, you suggest just hooking it up, to be honest, I'm apprehensive. I'm afraid I'm going to fill my mate's shed with acrid white smoke. Who am I kidding, maybe this week I'll give the Arboga a whirl, and I will take my camera, if I ever get it back from Greg.
Ken
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17th April 2011, 11:01 PM #14
But as I said... "If you put it in the 240V line, then when you hit it, the power to the controller would go off & the motor would free wheel to a halt."
If you wire up an emergency stop via the controller, then it will stop faster.
The 2 VFDs that I have both have a big red stopper that will stop the motor in 3 seconds.
Both also have an isolation switch in fairly easy reach that I can turn off if smoke starts coming out of the motor or the controller.Cliff.
If you find a post of mine that is missing a pic that you'd like to see, let me know & I'll see if I can find a copy.
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17th April 2011, 11:34 PM #15GOLD MEMBER
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If you feel isolation is likely to be a problem, this is the way I would go about it. (although I'm still not convinced about braking on the VSD I have with machines the size of mine)
Its possible you could cut the 240V and activate the E/stop on the VSD at the same time. But that's not something I would like to do often.
Stuart
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