Phase Rotation Detector
Phase Rotation Detector
(OP)
Can anyone fill me in on how a phase rotation detector works? I need to alter an existing design, but I'd like to understand how they works before attempting to do that. Any help would be great!






RE: Phase Rotation Detector
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Phase Rotation Detector
Beware that changing the phase sequence of your system will also change the direction of rotation of all your 3 phase motors presently in the system.
*Why a man thinks he outrun a chasing dog when it has twice as many legs?*
RE: Phase Rotation Detector
RE: Phase Rotation Detector
Since you now have created an asymmetry, the distance from this lagging voltage to the next vector is smaller than the distance to the preceding vector. Using purely resistive voltage dividers in the other two phases, you can get a significant difference, which is dependent on rotation direction. Sometimes two simple neon lights are used to show rotation direction - the one connected to the preceding vector is always the brightest.
A relay with dual coils is sometimes used to close a contact when rotation is right.
What is it that you need to change?
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Phase Rotation Detector
RE: Phase Rotation Detector
You just play around with what you have. Cannot do much harm if you remember to have enough series resistance so you do not peg the instrument.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...