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Old 03-20-2012, 11:19 PM   #41
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Have you guys seen ABB OTDC Series. That's their latest disconnects & DC rated for PV systems.

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Old 05-22-2012, 03:23 AM   #42
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spoke to an inspector recently about this issue as we were planning on installing VFD's and had been informed that a disconnect opening when drive running caused damage he said there was no need of a disconnect beside the motor as long as there was a notice at the motor clearly stating where the disconnect was located and again a notice on the disconnect clearly identifying the location of the motor
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Old 05-22-2012, 04:02 AM   #43
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That maybe true in Canada but not allowed under the NEC.
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Old 05-22-2012, 04:30 AM   #44
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Sir, good day! If i have a three water cooled chillers which each are having power capacity is 251kw, FLA is 421.14Amp and starting current is 1086 Amp. What should be the size of circuit breaker that I'm going to use each machine?

Thank you in advance and More Power.
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Old 05-22-2012, 11:19 PM   #45
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Originally Posted by marcusandreus View Post
Sir, good day! If i have a three water cooled chillers which each are having power capacity is 251kw, FLA is 421.14Amp and starting current is 1086 Amp. What should be the size of circuit breaker that I'm going to use each machine?

Thank you in advance and More Power.
You should start another new thread, this is not germaine to the original thread that you posted in. That said, this is a forum for North American electrical engineering issue for the most part. What you are describing is something that would relate to whatever the electrical codes and standards are in your country. What we would tell you that applies to North America may not be correct in your country. You should hire a qualified electrical engineer.
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Last edited by JRaef; 05-22-2012 at 11:22 PM.
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Old 05-23-2012, 12:23 AM   #46
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[quote="JRaef"]
You should start another new thread, this is not germaine to the original thread that you posted in.


The goddamn germans got nothing to do with it, don't you hear good?
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Old 05-23-2012, 01:17 AM   #47
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Im so sorry coz im new here. abyway,thanks for your professionalism.
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Old 05-23-2012, 04:35 PM   #48
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[quote=socalelect;721778]
Quote:
Originally Posted by JRaef
You should start another new thread, this is not germaine to the original thread that you posted in.


The goddamn germans got nothing to do with it, don't you hear good?
Not German, GERMAINE!


As in Germaine Jackson, Michael's brother.
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Old 05-23-2012, 11:09 PM   #49
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U totally missed it dude apparently u don't know who Buford t justice is.
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Old 05-30-2012, 11:21 AM   #50
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Alot of the places I work at have a kaleidoscope of drives from Cutler hammer to AB. We have disconnects at each motor or (some of you are going to get excited) receptacles. The operators constantly turn those disconnects on and off and sometimes the drive trips but they just reset it. You can have almost all the faults talk to your plc so the operator can see it on the HMI and reset it. *we log that information and review it* thats for 5 hp or less. Over that hp, either run a feed all the way to the motor disconnect first and then back to the drive. OR we install a custom box where the operator has to key off the drive before its possable for him to physically get at the disconnect. Of course there are lots of variables so its hard to say this will work or will not we almost exclusively use coast to stop.
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Old 06-07-2012, 09:48 AM   #51
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430.102 B 2 Says that the controller disconnecting means Shall be permitted to serve as the disconnecting means for the motor and exception 2 makes the allowance for a locking means when located out of sight of the motor, also FPN 1 seems to make a pretty obvious clarification for vfd's as being subject to additional hazards to property. It seems to me that a lockable disconnect anywhere up stream of the drive including the circuit breaker would satisfiy the NEC. What am I missing?
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Old 06-07-2012, 10:58 AM   #52
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Originally Posted by sseivard View Post
430.102 B 2 Says that the controller disconnecting means Shall be permitted to serve as the disconnecting means for the motor and exception 2 makes the allowance for a locking means when located out of sight of the motor, also FPN 1 seems to make a pretty obvious clarification for vfd's as being subject to additional hazards to property. It seems to me that a lockable disconnect anywhere up stream of the drive including the circuit breaker would satisfiy the NEC. What am I missing?
IIRC, it has to be a facility with an established LOTO safety procedure that is reviewed and monitored, something to that effect. So it doesn't universally apply to every installation.
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Old 06-07-2012, 11:19 AM   #53
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Thats Exception 2 b Which I took to be totally seperate.
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Old 10-18-2012, 09:07 PM   #54
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Quote:
Originally Posted by MDShunk View Post
Since I'm mostly an Allen-Bradley guy... I'll respond from an A-B persepective.

Yes, you can absolutely have a disconnect on the load side of a VFD, if you keep certain things in mind. Like the French sparky rightly points out, you MUST have it interlocked with the VFD itself. If you simply disconnect the three line side conductors, you'll toast your VFD. You absolutely need a 4th contact to interlock with the VFD to disable it from trying to run. In Allen-Bradley terms, that would mean installing the "Drive Guard" module in the VFD (standard fare, lately).

I like to use Meneekes IEC-style motor disconnects, which feature a low-current 4th pole as a standard item. Very LOTO friendly also.
http://www.mennekes.com/product_moto..._features.html
Hubbell makes a suspiciously similar product.
how about a disconnect with an aux. one that interrupts the run cmd.
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Old 10-18-2012, 09:13 PM   #55
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Quote:
Originally Posted by Peewee0413
how about a disconnect with an aux. one that interrupts the run cmd.
That's what we are talking also about. I know Square D has an add on kit for their newer disconnects. I'm sure the others do also.
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Old 10-19-2012, 02:22 AM   #56
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Hubble makes one that I have found to be reliable on an 7 hp motor.
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Old 10-19-2012, 06:10 AM   #57
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To add to all this, I wired a roof top exhaust fan that is controlled by a vfd back at the range hood. There was a factory installed disconnect on the fan and it had a sticker on it warning that the vfd must be shut off before the disconnect is shut off or "damage to drive may occur and warranty can be voided".

It seemed more to cover the manufacturers azz but at least they did post a warning.
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Old 10-19-2012, 06:19 AM   #58
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Quote:
Originally Posted by socalelect

U totally missed it dude apparently u don't know who Buford t justice is.
Jr, when i get home, im gonna punch ur momma right in the mouth!
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Old 10-19-2012, 10:26 AM   #59
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how about a disconnect with an aux. one that interrupts the run cmd.
If you look at my long previous post, I addressed this. If you just interrupt the Run command, the VFD output may still be On if the drive is programmed to Decel. You need to use an input on the drive that KILLS the output completely. They all have it, you just need to find it or program one of the inputs to do that.
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Old 10-19-2012, 10:42 AM   #60
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Jr, when i get home, im gonna punch ur momma right in the mouth!
Just heard an interview with Tyler Perry because he's in a new movie. They played a line of his from another movie where a father and son are talking.

"Daddy, why you being so mean?"
"Son, I wish I'd been meaner with your Mamma, then I wouldn't have to put up with you."

Looks like he stole that line concept from Smokey and the Bandit.

I just saw SatB on TV again last week, I admit now to being a little slow on the uptake of the references to Buford T. Justice. Great character.

I ran into a cop like him outside of Huntsville AL once a long time ago. Unlit cigar stub in his mouth and all. Pulled me over for doing 50mph, I said the last sign I saw said it was a 50mph limit. He said "Son, speed limit on this here stretch is 35, because I say so and I'm the law 'round here. But being that I see y'all are from California, I'm gonna take pity on ya 'n let ya off with a warnin' this time. You people are in too big a hurry to die as it is, I don't reckon I'll see you in this town again anyway."

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