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| Across-the-Line
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Connects motor directly to power source.
Full voltgage applied to motor when controller is actuated.
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| Primary Resistor
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When controller is actuated, a resistance is connected to each phase.
Resistors are by-passed after a time delay and motor then runs at full voltage. |
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| Autotransformer
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Starters supply reduced voltage starting at motor terminals through use of tapped, 3-phase autotransformer.
A timing relay causes transfer of motor from reduced voltage start to line voltage operation without disconnecting motor from power source.
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| Wye Delta Closed
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Same sequence as Open Transistion.
Connected to resistors in each phase during transistion from wye to delta. |
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| Part Winding
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Motor starts on one winding.
After a time delay second winding is connected in parallel to the line. |
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| Wye Delta Open
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On controller activation, motor windings wye-connected for starting.
After a time delay, automatically converts to delta connection for running, applying full voltage to motor windings.
Most often used with transfer swithc/emergency generator applications. |
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| Solid State Start
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Reduces inrush current to motor with adjustable ramp time.
Stop sequence reduces possibility of surges occurring in the system. |
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| Variable Speed Pressure Limiting
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Micro-processor based it displays module and pressure adjustment that is accessible without opening main door.
Has built in variable frequency drive.
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