×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

single phase motor
2

single phase motor

single phase motor

(OP)
I have a single phase 115v reversible motor with a destroyed
switch. I have four wires from the motor (there is also a capacitor) they are labeled 1,2,3 and 4  From an ohmmeter 1 and 2 give a completed circuit.  What kind of switch do I need and how do I wire it.  

RE: single phase motor

Hi bemerdude

Your running winding 1 & 2 appears OK .One question,if you have a destroyed starting switch,why can't you remove it and purchase a similar one form the vendor.
MG1-2.41 Terminal Markings Identified by wire colour or #s
T1/Blue/T2/White/T3/Orange/T4/Yellow
Starting windings T5/Black  T8-Red
Main Windings of asingle phase motor are T1/T2/T3/T4
Starting windings are T5/T6/T7/T8.
These leads may not be used on all of the motors .It depends if they,2 voltage,reversible or a combination.
You say that your leads are marked 1/2/3/4.You could have the starting winding leads internally connected.
In any case,your capacitor is in series with the CS(centrifugal switch)and the starting winding.
Each lead from your starting winding connects to the wires on your main winding.

Good Luck  

GusD

RE: single phase motor

I agree with Gus that 1 & 2 are the RUN windings.

If the motor is 115v ONLY then 3 & 4 are the start windings.
Is the switch in the motor (centrifugal) bad or do you need the reversing switch (wall mount)?

What is the rating on the capacitor and if you swap the ohm meter leads on the "OPEN" leads does the needle jump for just an instant?

RE: single phase motor

(OP)
steveKW - Yes it jumps for an instant.  The old switch which has no manufacturers label is a 12 connection 16 amp
3 phase 600V AC switch with a cylindrical body and has plastic cams that activate two contacts on each of three levels.  Thanks for your help.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources