Basic Start/Stop AC Motor Control Schematics

The following Drawings / Schematics demonstrate Basic Start & Stop Control Circuitry for 3 Phase, Squirrel-Cage Rotor type AC Induction Motors.

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A: Full-Voltage Start / Stop Control
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Schematic #1: Full-Voltage Start / Stop ("3-Wire") AC Motor Control;
Control Circuit = Line Voltage (Motor Voltage).

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Schematic #2: Full-Voltage Start / Stop ("3-Wire") AC Motor Control;
Control Circuit = Low Voltage (via Transformer connected to Motor Circuit).

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B: Basic Wye-Delta Start / Stop Control
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Schematic #3: Wye-Delta Reduced Voltage Start / Stop Motor Control.

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end.
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Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!