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How do you convert 200 volt 3 phase without a common lead to power a single phase 200 volt ac motor with separate phase two speed connectors they are marked Run Start and Common?
Thebeast73
Any two phases of the three phase can be used.
Connect one phase to the Common and the other to both the Run and the Start.
The Common means that it has a common connection with the Run winding and the Start winding. When the circuit is energized both the Run and the Start windings will be energized to start the motor turning (motor needs the extra torque provided by the Start winding to get the motor spinning). Once the motor reaches 75% of normal operating speed the centrifugal switch that is in series with the Start winding will open, removing power from that part of the circuit and the Run winding will keep the motor spinning.
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∙ 14y ago
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