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#129287 - 01/03/05 04:25 PM Motor Hook 12 lead  
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 822
Michigan
We have a 12 lead mtr. For a fire pump . Voltages on name plate 200/400.
We're being told it can be hooked up to a Straight 208 vOLT 3 PHASE. One Starter/
Wiring diagram on mtr shows Start y Run Delta.
20 hp. anyone ever run into this???


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#129288 - 01/03/05 06:09 PM Re: Motor Hook 12 lead  
aland  Offline
Member
Joined: May 2004
Posts: 186
United Kingdom
Could it be a two speed motor? sounds to me like a set of windings for low speed and a set for high speed simple resistance test across windings might give you a clue!


#129289 - 01/03/05 06:21 PM Re: Motor Hook 12 lead  
Anonymous
Unregistered

Just use a start Y, run Delta starter. and feed it with the 208 Y.

The starter will have two contact sets and coils which should be interlocked.


#129290 - 01/03/05 06:27 PM Re: Motor Hook 12 lead  
Anonymous
Unregistered

http://www.usmotors.com/products/ProFacts/1-105ystart.htm

Sorry I could not edit my original post. Hope this helps. 12 leads because your 200/400.


#129291 - 01/03/05 08:01 PM Re: Motor Hook 12 lead  
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
The run configuration is delta, so hook it up per the low voltage run connection.
Don


Don(resqcapt19)

#129292 - 01/04/05 12:40 AM Re: Motor Hook 12 lead  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
 
From a liability standpoint for building-fire protection, it may be a serious mistake not to have specific documentation that the starting method called out by the pump manufacturer is unambiguously provided but the fire-pump controller, with the two correctly interconnected.

If the fire pump is intended for reduced-voltage starting, a controller providing only full-voltage starting may be a critical misapplication.


#129293 - 01/07/05 10:53 AM Re: Motor Hook 12 lead  
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 822
Michigan
Answer is Delta Run. Checked with several motor rewind shops ect.

Its also in Electrical Engineering Pocket handbook.
Thanks guys for the imput. Never to old to learn. Yoopers
L1=1-6-7-12
L2=2-4-8-10
L3=3-5-9-11

low voltage run


#129294 - 01/08/05 02:06 AM Re: Motor Hook 12 lead  
electricpete  Offline
Junior Member
Joined: Nov 2004
Posts: 3
"If the fire pump is intended for reduced-voltage starting, a controller providing only full-voltage starting may be a critical misapplication."

Reduced voltage starting protects the power system, not the motor. Prevents things like neighbor's lights flickering. Would not afffect the fire pump function.

[This message has been edited by electricpete (edited 01-08-2005).]


#129295 - 01/08/05 04:03 AM Re: Motor Hook 12 lead  
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,707
Anaheim, CA. USA
electricpete,

1st off, welcome to ECN!

I believe the point of which Bjarney is referring to
(reply covering the Wye / Delta starting intentions of the Motor and the possible liability involved with misapplication),
would be critical issue to the design and application of this particular Motor/Pump assembledge.

In other words, if the connected Pump has something similar to excessive head pressure (per an Air Compressor's Pump at start without "dumping" the pressurized air between cylinder and tank), the Motor may either stall / continuous Locked Rotor scenario, or draw excessive Current for an excessive time period - both of which will cause one or both of the following:
<OL TYPE=A>

[*] Overcurrent device trip,

[*] Huge volumes of Smoke loss from Motor's windings.
</OL>

I can see the Lower Voltage (Wye Connection) starting means allowing the Pump to get things flowing enough to allow full speed / line voltage connection of Motor to enable without the effects of "A" and/or "B" above.

***DISCLAIMER***
I am probably wrong about the starting intentions, along with Bjarney's reply, so feel free to flame away at me if above information is indeed bunk!

Just my 2¢

Scott35

edited to fix bad HTML tagging ... Bad tag!!! go sit in the corner!!!

[This message has been edited by Scott35 (edited 01-08-2005).]


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

#129296 - 01/14/05 09:13 AM Re: Motor Hook 12 lead  
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 822
Michigan
Controller & motor supplied by the Fire Pump installers , Reason I had asked the question was for my piece of mind.


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