Dahlander pole changing circuit (speed control). - Electrician Talk - Professional Electrical Contractors Forum
Go Back   Electrician Talk - Professional Electrical Contractors Forum > Electrical Trade Topics > PLCs, VFDs, Motors and Controls

Thread Tools Display Modes
Old 03-21-2013, 01:42 PM   #1
Junior Member
Join Date: Mar 2013
Location: Ontario, Canada
Posts: 1
Rewards Points: 10
Default Dahlander pole changing circuit (speed control).

Anyone have any experience with a 3 phase Dahlander pole changing starter? The motor has 6 windings with 9 leads out. It's a delta/parallel wye squirrel cage motor used to rotate a board cooler. Starts in delta (slow speed) for 1 second, switches to paralled wye for 2 seconds (fast speed) and back to delta for 1 second. It's been running for 20 years with no problems until now. This is not a reversing starter but in the past week its started in the oposite direction for one cycle and then goes forward again. Its done this about 6 times in the past week. We're going to put a drive in place of the 4 contactors but I was curious if anyone has heard of this before.
rrogers343 is offline   Reply With Quote
Join Contractor Talk

Join the #1 Electrician Forum Today - It's Totally Free!

ElectricianTalk.com - Are you a Professional Electrical Contractor? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's the leading place for electricians to meet online. No homeowners asking DIY questions. Just fellow tradesmen who enjoy talking about their business, their trade, and anything else that comes up. No matter what your specialty is you'll find that ElectricianTalk.com is a great community to join. Best of all it's totally free!

Join ElectricianTalk.com - Click Here JOIN FOR FREE

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ElectricianTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

Sponsored Links
Old 03-21-2013, 02:37 PM   #2
John Valdes's Avatar
Join Date: May 2007
Location: South Carolina
Posts: 16,276
Rewards Points: 1,228

I am not familiar with a nine lead motor being used in this manner.
John Valdes is offline   Reply With Quote
Old 03-21-2013, 03:34 PM   #3
Senior Member
JRaef's Avatar
Join Date: Mar 2009
Location: SF Bay Area, California
Posts: 5,378
Rewards Points: 636

You don't need 4 contactors for a Dahlander motor, it is just the IEC terminology for exactly the same as a 2 speed 1 winding motor in NEMA terminology. It only takes 3 contactors to make it work. The 4th is then likely a reversing contactor, even though you may have never used it that way on purpose. Sounds to me like something has gone wrong with your control circuit and now it is reversing on you.


Is it weird how saying sentences backwards creates backwards sentences saying how weird it is?

Last edited by JRaef; 03-21-2013 at 03:37 PM.
JRaef is offline   Reply With Quote
The Following User Says Thank You to JRaef For This Useful Post:
John Valdes (03-22-2013)

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Three Speed Ceiling fan control for three fans DCooper Residential Electrical Forum 4 07-30-2012 08:03 PM
Fan Speed Control crazymurph General Electrical Discussion 1 02-08-2010 11:45 PM
Motor Speed Control Royston PLCs, VFDs, Motors and Controls 7 08-02-2009 01:31 PM
Speed control and power consumption Keln General Electrical Discussion 2 02-10-2009 11:17 PM
can a 200 mA speed control motor overload? theripley General Electrical Discussion 1 01-09-2009 10:45 AM

All times are GMT -4. The time now is 05:11 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Our Pro Sites Network
ContractorTalk.com | DrywallTalk.com | HVACSite.com | PaintTalk.com | PlumbingZone.com | RoofingTalk.com