Klockner Moeller Electric Parts from KlocknerMoeller.net

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All about Motors
Star-delta switching of three-phase motors
 
Automatic star-delta starters SDAINL EM
Klockner Moeller Automatic star-delta starters SDAINL EM
 
Method of operation
Pushbutton I energizes star contactor Q13, the normally open contact Q13/14–13 applies voltage to mains contactor Q11: Q11 closes and applies mains voltage to motor M1 in star connection. Q11 and Q13 maintain themselves via normally open contact Q11/14–13 and Q11 additionally via Q11/44–43 and pushbutton 0. Timing relay Q11 is energized at the same time as mains contactor K1. When the set changeover time has elapsed, K1 opens the circuit of Q13 via the changeover contact 15–16 and closes the circuit of Q15 via 15–18. Star contactor Q13 drops out.

Delta contactor Q15 closes and switches motor M1 to 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.

The motor cannot be started up again unless it has previously been disconnected by pushbutton 0, or in the event of an overload, by the normally closed contact 95–96 of the overload relay F2, or via the normally open contact 13–14 of the motor-protective circuit-breaker or circuit-breaker.
 
 

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