The contactor or relay coil is a rather large inductor and when the drive current from your 24vdc plc is opened the coil inductor tries to keep the current. Now the reverse contactor gets supply through phase r off push button f2 reverse contactor coil r1 phase y.
Reversing Motor Starter Wiring Diagram H1 Wiring Diagram
Dol starter forward reverse diagram. Rdol starter consists of two contactors connecting power supply to the motor. For simplicity the plc implementation of the circuit in figure 1 includes all of the elements in the hardwired diagram even though the additional starter contacts normally closed r and f in the hardwired circuit are not required since the push button interlocking accomplishes the same task. These type of starters are used in various applications eg mixing of materials dying. The first contactor provides a phase sequence to stator of motor to produce rotation in one direction while other contactor has different phase sequence changing the di. Direct on line starter wiring diagram. The connection of contactor can be done among relay coil supply voltage as well as thermal overload.
The figure given below shows the control and power diagram of forward and reverse starter diagram. To run the motor of above 05 hp rating circuit has to made in star delta. In this post you will complete learn about the forward reverse three phase motor controlling starter diagram. I believe your plc card is getting damaged by the reverse voltage surge when the contactor coil is turned off. A dol starter or direct on line starter or across the line starter is a method of starting of a 3 phase induction motorin dol starter an induction motor is connected directly across its 3 phase supply and the dol starter applies the full line voltage to the motor terminals. Reverse forward motor starter control and power circuit with diagram motor windingstar delta starterdol starterstar delta connection3 phase dol starter connection diagram direct online starter.
Dol starter control diagram three phase. The wiring of direct on line control circuit starter is following. The auxiliary contact r2 becomes no from nc therefore the motor does not run in the forward direction. In the 3 phase motor forward reverse starter wiring diagram. The l1 contactor is connected from normally open no to r phase using mccb. Despite this direct connection no harm is done to the motor.
Figure 2 forwardreverse motor wiring diagram. Forward reverse star delta starter control wiring connection diagramstar delta control circuit diagram reverse forward star deltalight bulbelectronicssta. I shown the 3 pole mccb circuit breaker 2 magnetic contactor normally open normally close push button switch thermal overload relay 3 phase 4 wire system supply 3 phase. These forward and reverse starters are dol type and not used above the 05 hp motors. What is dol starter. Wiring diagram of dol starter.
Gallery of Dol Starter Forward Reverse Diagram
