Tuesday , September 14 2021

Reverse and Forward Control Diagram

Power Wiring OF Reverse And Forwaed Motor

For three phase motor forward reverse negative feedback circuit . We use 2 ‘magnetic contactors’ as forward reverse switch. Here I showed the forward reverse schematic . within the diagram I connect the incoming three phase supply L1, L2, L3 to the MCCB breaker (molded case circuit breaker). And from the MCCB breaker, I connect the availability to both ‘magnetic contactors’. Here the L1 is connecting to the both contactors first terminal. L2 wire connected to the both ‘contactors’ 2nd terminal. And L3 wire connected to both ‘contactors’ 3rd terminal.

But the out connection is different. Where L1 is connected on T1 terminal and connected on T3 terminal in 2nd magnetic contactor. The L2 is connected is both contactor in same terminals (T2). The L3 is connected in T3 terminal in first contactor and in 2nd contactor in T1 terminal. After that the three phase supply goes to thermal overload relay and from thermal overload relay the soppy goes to the three phase motor connection plate and provided to three phase motor. Here I even have shown the forward reverse control diagram for 3 phase motor.

Reverse And Forward Control Diagram

Forward reverse control diagram Now come to the controlling wiring. Here I had shown that the both cont actors are 220 VAC. this suggests that the contactors also required the neutral wire. within the above 3 phase motor forward reverse schematic . The neutral wire first goes to the thermal overload relay NC contacts and to the sunshine indicator. From the 2nd thermal overload relay Normal close contacts the availability goes to the both contactors coil contacts/terminals. And hook up with both magnetic contactors A1-A1 terminals. After that the L1 wire is goes to the thermal overload relay NO contacts and from 2nd thermal relay NO contacts terminal the wire goes to the sunshine indicator. So if the motor trip the sunshine indicator will glow up. For Normally close (red/stop) push switch the availability comes from the L3 in red color wire. And from the NC switch the wire goes to both NO switches (forward and reverse push button). And from here the Hold current wire goes to the both magnetic contactors NO auxiliary contacts(connection points). From the forward push switch the (touch current) supply goes to 2nd contactor NC auxiliary contacts and from the auxiliary contacts the wire goes to the primary magnetic contactor NO auxiliary contacts terminal and coil A2 terminal as shown within the above forward reverse control diagram. The same wiring connection is completed with the reverse push switch. The touch or starting current goes from the reverse push and hook up with the primary contactor Normally close auxiliary contact/terminal and from the auxiliary contacts the wire goes to 2nd contactor Normally open auxiliary contacts/terminal and contactor coil A2 terminal as shown in above diagram.

In the above connection, if the one contactor energized then other contactor won’t energized in same time.

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