# circuit diagram question

Discussion in 'Electronic Basics' started by Chuck Young, Oct 25, 2003.

1. ### Chuck YoungGuest

I bought a surplus 0.7 amp motor without paying attention to the wiring
diagram printed on it.

It has:

Red ---------Line
Black - - - - Line
Black---)|---Red
Blue ---------Line
Green--------Grnd

I'm not sure what the dotted line from black to line voltage is, and have no
clue what component a )| is. Any help? Thanks!

2. ### John PopelishGuest

I think this may be a reversible motor. You connect the cap between
black and red and connect blue to one side of the line. To get it to
go one way, also connect red to the other side of the line. To make
it go the other way, instead of connecting red to the line, connect
black to the line.

When red is connected to the line, the winding from red to blue is
directly fed, and the winding between black and blue is fed through
the cap.

When black is connected to the line, the winding between black and
blue is directly fed, and the winding between red and blue is fed
through the cap.

If I am right, you should read similar resistances between red and
blue as between black and blue, and twice this resistance between
black and red (the two windings in series).

capacitor

4. ### Paul BlitzGuest

Sounds to me like it COULD be a 3-phase motor.... (except that is normally
red / blue / yellow)

The "Black---)|---Red" says to me that you need to connect the external
starting capacitor between Black & Red

Paul

5. ### Don KellyGuest

-----------
If 3 phase, no start capacitor is needed. I think you are right as to the
start capacitor connection -the blue -line is a bit of a puzzle -possibly
from start winding to the line connected to red. However, it is an easy job
to check continuity between terminals and sort out what is connected to what
in the motor.