The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Looking for older post
by Trumpy
16 minutes 16 seconds ago
Last time to chat here
by Trumpy
Yesterday at 11:41 PM
Unsafe Situations
by Trumpy
Yesterday at 09:46 PM
Safety at heights?
by Trumpy
Yesterday at 09:13 PM
Webmaster > Admin
by Trumpy
Yesterday at 08:29 PM
New in the Gallery:
Desk-mounted "power-board"
Shout Box

Top Posters (30 Days)
Admin 35
HotLine1 20
Trumpy 19
Ruben Rocha 17
gfretwell 15
Who's Online
1 registered (Trumpy), 160 Guests and 11 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#35117 - 03/05/04 09:49 AM Motor Connection
Roger Loock Offline
Member

Registered: 10/04/02
Posts: 16
Loc: Hillsboro,Oregon,USA
Does anyone have a connection diagram for an old (1940's) 4 lead motor. Dual voltage?
Owner says its 120/240 V single phase, 1.5 HP.

Thanks, Roger

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#35118 - 03/05/04 10:39 AM Re: Motor Connection
Trumpy Online   content


Member

Registered: 07/05/02
Posts: 8560
Loc: SI,New Zealand
Roger,
Is there a chance that this motor may be a multi-speed type?.
Some motors have a seperate Live wire for Low, Medium or High speed.
Only other thing that I can think of, would be that two of the wires are meant for the connection of a Starting Capacitor.
Hope that this is of some help to you.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin

Top
#35119 - 03/05/04 12:59 PM Re: Motor Connection
Roger Loock Offline
Member

Registered: 10/04/02
Posts: 16
Loc: Hillsboro,Oregon,USA
Don't think so. It's on an air compressor. He got it from his father in law. It was running on 120v, he re wired it to 220 and it won't come up to speed, of course the wiring diagram is missing.

I am just not familiar with 4 lead motors, thought it may be some antique winding method. I do not see any evidence of a starting cap.

Thanks, Roger

Top
#35120 - 03/05/04 01:36 PM Re: Motor Connection
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
Suggest taking it to a motor shop and let an experienced motorguy sort it out. {Check under terminal cover for label.}

Verbal information from a non-motor person should be suspect. A wrong connection may easily smoke the motor before you can get to the plug. An induction motor ‘not coming up to speed’ will soon be a smoker, too.

Top
#35121 - 03/06/04 07:33 AM Re: Motor Connection
classicsat Offline
Member

Registered: 11/23/02
Posts: 449
It's probably a Repulsive Induction motor
(something I know a little of, got a half dozen on the farm).

If thats the case each pair is a winding wired in series or parallel for 230 or 110V operation. The trick is finding the polarity for each, so the motor properly runs.
Direction is reversed by moving the brush assembly.

Top


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals