Three phase system

Thread Starter

feferry

Joined Dec 8, 2005
1
How would you determine proper phase sequence using an oscilloscope. Please detail connections and procedure.
 

beenthere

Joined Apr 20, 2004
15,819
Hi,

Pick a phase as a reference and display on ch 1. Pick another & see if it leads/lags the reference.

Another quickie - if the motor runs the wrong way, just swap any two phases to correct.
 

dougp01

Joined Dec 6, 2005
28
Three phase systems operate on 120 degree angles. If you reference phase A with one o'scope probe, a second scope probe will show phase B lagging A by 120 degrees, and phase C should lag A by 240 degrees.
 
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