# Simple three phase motor wiring question

Discussion in 'General Electronics Chat' started by oidium45, Sep 24, 2011.

1. ### oidium45 Thread Starter Active Member

Apr 24, 2010
130
8
Assuming that a motor is wired up to L1,L2,L3 (in that order) and it is moving forward. I understand that swapping two legs will cause the motor to go in reverse. For example: (L1,L3,L2), (L2,L1,L3), (L3,L2,L1). But what effect would this configuration likely produce? (L3,L2,L1), (L3,L1,L2), (L2,L3,L1).

2. ### #12 Expert

Nov 30, 2010
16,705
7,358
Just count the number of 2 wire reversals. Odd number, it runs backwards. Even number, it's turning the same way.

3. ### oidium45 Thread Starter Active Member

Apr 24, 2010
130
8
Eh? Odd number? Even number?
Are you saying that if i have "one" two wire reversal it operates in reverse, and "two" two wire reversals will cause the motor to operate forward again?

4. ### #12 Expert

Nov 30, 2010
16,705
7,358
The numbers 1,3,5,7,9 are odd numbers. The numbers 2,4,6,8 are even numbers.

Apr 24, 2010
130
8

6. ### #12 Expert

Nov 30, 2010
16,705
7,358
And you adding clarification to your question after I answered really makes me look sarcastic, but your premise in post #3 is correct. Every time you swap 2 wires, the motor reverses. Two reverses is back where it was in the first place.

7. ### oidium45 Thread Starter Active Member

Apr 24, 2010
130
8
Thank you! I appreciate the help.
Just to clarify, i was updating the post during your response.