- #CONTROL CIRCUIT FOR FORWARD AND REVERSE MOTOR HOW TO#
- #CONTROL CIRCUIT FOR FORWARD AND REVERSE MOTOR SOFTWARE#
- #CONTROL CIRCUIT FOR FORWARD AND REVERSE MOTOR SERIES#
#CONTROL CIRCUIT FOR FORWARD AND REVERSE MOTOR SOFTWARE#
We have solution by controlling the relay switching by software programming, to add middle transition status – both relays off in between, so the new working logic has become Relay 1 on Relay 2 off -> Both Relays off -> Relay 2 on Relay 1 off, and we can further add a timer to better protect our DC motor.Īnother factor to notice is since current to motor goes through both relays, it is very important to make sure both relay rating is enough for DC motor, and make sure the wires or PCB connection is enough too, or sometimes too high motor load current would cause damage to our control board, especially to the PCB track on board. (forward and reverse) for a three-phase electric motor: This is a realistic scenario, where the only type of switch you have available is a SPDT, but the wiring diagram calls for something different. AC Motor Control Circuits AC Electric Circuits.
#CONTROL CIRCUIT FOR FORWARD AND REVERSE MOTOR SERIES#
In addition to the popular World K series of standard AC motors, Oriental Motors newer KIIS series of high torque three-phase AC motors were designed to to work with VFDs. When a logic signal is applied to the forward terminal, the GN0 switches L1 and L2 directly to. Run this motor in the Forward and Reverse direction using Ladder Diagram. A VFD is designed to control the direction and speed of three-phase motors (and much more), so instantaneous forward/reverse operations can be done much easier.
Problem Description A motor is connected to PLC. However, simple switch between relay status, such as Relay 1 on Relay 2 off -> Relay 2 on Relay 1 off may cause damage to DC motor, especially when the load is high, since the relay switch is very quick compared to motor mechanical move forward to stop and then move backwards. This is a PLC Program to Drive Motor in Forward and Reverse Direction. When, for example, relay 1 activated and relay 2 de-activated, NO1 connected to COM1 and NC2 connected to COM2, battery current flows from positive contact -> NC2 -> COM2 -> DC motor’s lower contact -> DC motor’s upper contact -> COM1 -> NO1 -> battery negative contactĪnd when relay 1 is de-activated and relay 2 is activated, NC1 connected to COM1 and NO2 connected to COM2, battery current flows from positive contact -> NC1 -> COM1 -> DC motor’s upper contact -> DC motor’s lower contact -> COM2 -> NO2 -> battery negative contactĪs you can see, we have switched the polarity connection to DC motor by switching the on-off status of SPDT relays, thus simply can control the garage open or close etc. The short principle is only one relay activated at one time, no more, no less.
#CONTROL CIRCUIT FOR FORWARD AND REVERSE MOTOR HOW TO#
The trick involves a DC motor and two SPDT relays – the most common seen one which has three pins marked N/C COM N/O, and the matching circuit to control the two SPDT relays, or you can buy our wireless remote relay SR-RCS-202U, which has integrated two SPDT relays and control mechanism.Īs you can see from above schematic diagram, the connection is very simple, and here is a short description on how to achieve motor forward and reverse using above connection. While some motors have this feature built-in, most of them we seen today doesn’t, so we may need a little trick to achieve the goal. The NPN transistor BD 139 drives the output from timer IC, this output pulse duration decides the speed of DC motor, by varying the VR1 resistor we can vary the pulse output of timer.Motor forward and reverse is a very common seen application in our daily life, for example, we can use DC motor to control garage door open and close, gate extract and retract, curtain up and down etc, these all have one thing in common, the DC motor movement in two directions. The diode D1 protects the DC motor from the back emf effect hence there is no output load effect rise. The DC motor is connected to the supply through DPDT ( double pole double through ) switch, by changing the switch position we can get forward and reverse rotation from the DC motor because this switch interchanges power supply polarity applied to the DC motor. In this website we already published about Speed control of DC motor with timer IC, here this circuit constructed for the basic motive to meet the forward / Reverse operation of DC motor with speed control.