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Motor protection with MCB with thermal and magnetic trips
Operating mode: Same as for direct on line starting instead of fuses and thermal relay you can use a motor circuit breaker with thermal and magnetic trips, a simple but at least as effective component. By pressing Forward push button the Q2 coil contactor is energized the motor will be connected for clockwise run and maintains itself after the button Reverse by means of auxiliary switch Q2, the Stop button and the auxiliary contact of Q3, which serves as interlock, thus avoiding simultaneous connection of Q2 and Q3 contactors. In a similar manner things take place if we want to change the direction of rotation, thereby pressing Reverse button contactor Q3 is connected so the motor is rotating counterclockwise, this is possible only by activating previously the Stop button. When overload occur circuit breaker opens Q1 so the motor is stopped.
Calculation of MCB and contactors
The Q1, Q2, Q3 contactors must be chosen according with rated power of your motor.
This product can be bought using this link: https://automation-electric.com/shop/three-phase-motor-starters/forward-reverse-dol-starters/
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Protectie cu disjunctor magneto-termic
Modul de operare: Ca si in cazul pornirii directe in loc de sigurantele fuzibile si releul termic se utilizeaza un disjunctor magneto-termic, o pornire mai simpla dar cel putin la fel de eficienta. Prin acţionarea butonului Inainte se energizează bobina contactorului Q2, motorul v-a fi conectat pentru rotire în sens orar și se automenţine după eliberarea butonului Inainte prin contactul auxiliar Q2, butonul Stop si contactul auxiliar al Q3, care are rol de interblocare, astfel se evita conectarea simultana a celor doua contactoare . Prin acţionarea butonului Inapoi, se conectează contactorul Q3 astfel motorul se rotește în sens antiorar, acest lucru este posibil numai dupa actionarea butonului Stop. La suprasarcină se deschide disjunctorul magneto-termic Q1.
Dimensionarea componentelor
Valorile pentru Q1, Q2 trebuie alese in functie de puterea nominala a motorului, in conformitate cu datele de pe placuta cu informatii data de producator . Sigurantele fuzibile F1 si F2 pentru partea de comanda pot avea valori de pana la max. 2 A.
Asa arata un produs pe care il fabricam noi, care poate fi achizitionat de la magazinul online : https://automation-electric.com/ro/shop/three-phase-motor-starters/forward-reverse-dol-starters/
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