in Machines & Robotics

Two Motor Controls with a Shared E-stop

1.8k Views

Two Motor Controls with a Shared E-stop

This video demonstrates how to implement a shared emergency stop (E-stop) circuit for two motor controls. The E-stop circuit ensures that both motors can be safely shut down in an emergency situation.

The circuit uses a normally closed (NC) pushbutton for the E-stop. When the pushbutton is pressed, the circuit is broken, and the motors are stopped. This ensures that the motors can be stopped quickly and safely in an emergency.

The circuit also uses a normally open (NO) pushbutton for the start button. When the start button is pressed, the circuit is closed, and the motors start. This ensures that the motors can be started safely and easily.

The circuit is simple and easy to implement. It can be used with a variety of motor controls.

Components

The following components are needed to build the circuit:

  • Two motor controls
  • One normally closed (NC) pushbutton for the E-stop
  • One normally open (NO) pushbutton for the start button
  • Two relays
  • Two diodes
  • One power supply
  • Some wire

Circuit Diagram

The circuit diagram is shown below.

Emergency stop circuit diagram

Construction

To build the circuit, follow these steps:

  1. Connect the E-stop button to the NC contact of the first relay.
  2. Connect the start button to the NO contact of the first relay.
  3. Connect the common terminal of the first relay to the positive terminal of the power supply.
  4. Connect the NO contact of the first relay to the positive terminal of the second relay.
  5. Connect the common terminal of the second relay to the positive terminal of the motor control.
  6. Connect the negative terminal of the motor control to the negative terminal of the power supply.
  7. Connect the diode to the negative terminal of the motor control and the positive terminal of the power supply.
  8. Repeat steps 1-7 for the second motor control.

Operation

When the start button is pressed, the first relay is energized, and the NO contact is closed. This allows current to flow to the second relay, which is also energized. The NO contact of the second relay is closed, and the motor starts.

When the E-stop button is pressed, the NC contact of the first relay is open. This breaks the circuit, and the second relay is de-energized. The NO contact of the second relay is open, and the motor stops.

Safety Precautions

It is important to take the following safety precautions when working with electrical circuits:

  • Always disconnect the power supply before working on the circuit.
  • Never touch any live wires.
  • Use appropriate safety equipment, such as gloves and safety glasses.

Conclusion

This video has demonstrated how to implement a shared emergency stop (E-stop) circuit for two motor controls. The E-stop circuit ensures that both motors can be safely shut down in an emergency situation. This is a simple and easy-to-implement circuit that can be used with a variety of motor controls.

For more information on motor controls and emergency stop circuits, please refer to the resources listed below.

Trades & Skills