The motor is using for induced draft fan. A dual starter connects the motor terminals directly to the power supplyhence the motor is subjected to the full voltage of the power supplyconsequently high starting current flows through the motor.
Star Delta Starter Plc Programming And Wiring Part 1
Star delta starter with vfd diagram pdf. Difference between dol star delta vfd and soft starter. Star delta starter can be used only for low to high power three phase induction motors. Here the starting current will be 6 times of full load current. We closed all the dampers and started the motor with stardelta starter by setting the star time as 9sec anf relay. Refer to the below star delta circuit. For a star delta starter there is a possibility to place the overload protection in two positions in the line or in the windings.
Overload relay in line. It has two alternatives one is vfd and other is stadelta starter switching. The power circuit uses to create contact between the motor and three phase power supply. The peak starting torque is 33 of full load torque. The peak starting current is 13 to 26 of full load current. The control circuit uses to control the starter circuit such as on off and tripping operations.
The starting current is 33 of full load current for star delta starter. In the line is the same as just putting the overload before the motor as with a dol starter. Characteristics features of star delta starter. Star delta starters consist of a power circuit and control circuit. This is a big advantage of a star delta starter as it typically has around 13 of the inrush current compared to a dol starter. This type of starting is suitable for small motors below 5 hp 375 kw.
Star delta connection diagram and working principle. A star delta starter is a type of reduced voltage starterwe use it to reduce the starting current of the motor without using any external device or apparatus. Size of each part of star delta starter 1 size of over load relay. Now drive is in trouble we tried to switching the motor with star delta starter but it is tripping continuously. Each starter is delivered assembled bare cabled by us and contains. 1 km1 line contactor 1 km2 star contactor 1 km3 delta contactor the hold in contacts the electrical interlocking contacts for both the star and delta contactors the space for the thermal ol relay direct mounting.
The difference between dol direct online starter star delta vfd and soft starter is explained below with operation diagram and their uses in different applications. Star delta connection circuit diagram. Dol direct on line starter.
Gallery of Star Delta Starter With Vfd Diagram Pdf
