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7.7.2 Inside Delta Connected Starter

An inside delta connected soft starter is shown in Figure 40, where the power poles are connected in series with the stator windings of a

delta connected motor.

For an inside delta connected motor, the starter current is less than the line current by a factor of 1.55 (FLA/1.55). By comparison of

Figure 39 and Figure 40, the most obvious advantage of the inside delta starter is the reduction of current seen by the soft starter. The

soft starter can be downsized by a factor of 1.55, providing significant savings in cost and size of the starter.

An inside delta soft starter can also be considered for motors with more than 6 leads, including 12 lead dual voltage motors.

NEMA and IEC use different nomenclature for motor terminal markings, for 3 and 6 leaded motors.

NEMA labels motors leads, 1,2,3,4,5,6,

IEC labels motor leads, U1, V1, W1, U2, V2, W2

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7 - THEORY OF OPERATION

Figure 40: Typical Inside Delta Motor Connection

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