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Moeller Wiring Manual > Electronic motor starters and drives > General > Three-phase asynchronous motor > Starting and operating methods
Electronic motor starters and drives
General

Starting and operating methods [t-head3-np]

The most important starting and operating methods for three-phase asynchronous motors include:

DOL starters
(electromechanical)
 
Star-delta circuit
(electromechanical)

 

 
M ~ I, n = constant
 
M ~ 1⁄3 M, n = constant

 

 

Soft starter and solid state contactor
(electronic)
 
Frequency inverter
(electronic)

 

M ~ U2, n = constant
 
M ~ U/f, n = variable

 

 

UBoost = Start pedestal (adjustable)

tRamp = Ramp time (adjustable)

 

U2 = Output voltage (adjustable)

UBoost = Start pedestal (adjustable)

tRamp = Ramp time (adjustable)

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