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All about Motors
Star-delta switching of three-phase motors
 
Automatic reversing star-delta starter SDAIUL
Reversing
Klockner Moeller SDAIUL
Rating of switchgear
Q11, Q12 = Ie
F2, Q15 = 0.58 × Ie
Q13 = 0.33 × Ie

The maximum motor output is limited by the upstream reversing contactor, and is lower than with automatic star-delta starters for only one direction of operation

Standard version: relay current = motor rated current × 0.58
Reversing after actuation of pushbutton 0
Method of operation
Pushbutton I energizes contactor Q11 (e.g. clockwise), pushbutton II energizes contactor Q12 (e.g. anticlockwise). The contactor first energized applies voltage to the motor winding and maintains itself via its own auxiliary contact 14–13 and pushbutton 0. The normally open contact 44–43 fitted to each mains contactor energizes the star contactor Q13. Q13 energizes and switches on motor M1 in the star connection. At the same time, timing relay K1 starts. When the set changeover time has elapsed, K1/17–18 opens the circuit of Q13. Q13 drops out. K1/17–28 closes the circuit of delta contactor Q15.

Delta contactor Q15 energizes and switches motor M1 to the delta configuration, i.e. full mains voltage. At the same time, normally closed contact Q15/22–21 interrupts the circuit of Q13, thus interlocking against renewed switching on while the motor is running. Motor direction can be changed, either after pressing pushbutton 0, or by direct actuation of the reverse button, depending upon the circuit. In the event of an overload, disconnection is effected by the normally closed contact 95–96 of the overload relay F2.

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