Relays, transformers, actuators and a differential controller

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SUMMARY

This discussion focuses on controlling an actuator motor for a valve using a differential temperature controller and a 120V relay. The user aims to utilize the relay's output to switch a transformer that supplies 24VAC to the actuator motor, allowing it to turn the valve in both directions based on the relay's state. The proposed solution involves using a double throw relay to manage the direction of the 24VAC supply, but concerns arise regarding continuous power draw on the actuator. Proper electrical design considerations are necessary to ensure the actuator operates correctly without damaging the components.

PREREQUISITES
  • Understanding of differential temperature controllers
  • Knowledge of relay operation and wiring
  • Familiarity with transformer usage in AC circuits
  • Basic principles of actuator motors and their control
NEXT STEPS
  • Research wiring configurations for double throw relays in actuator applications
  • Learn about transformer specifications for supplying 24VAC
  • Investigate the electrical design principles for controlling motors with relays
  • Explore the use of limit switches for position feedback in actuator systems
USEFUL FOR

Electrical engineers, hobbyists working on automation projects, and anyone involved in designing control systems for actuators and relays.

nlaham
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I have a uniquie project I am working on and was wondering if someone could tell me how it would be possible to control a mechanism using my current controller.

Right now I have a differential temperature controller that uses two sensor probes and turns on and off a 120V relay switch if the conditions are met. The output is normally used to provide power or cut power to a pump, but I want to use the output for something a little more complicated if possible.

I have an actuator motor that turns a valve. When supplied with 24VAC it will activate the motor. When supplied current in the other direction, it turns back to the original position.

How can I use the output of the 120V relay to turn the valve when the controller outputs power, and turn the valve back when the controller cuts power.

I thought if I use a transformer to provide the valve 24V to a double throw relay, and have my relay coil wired to the 120V output. Then when I give power to the relay, I have 24V in one direction, and when I lose power to the relay, I have power in the other direction. Only problem is, then the actuator valve is always drawing 24V. I'm not sure if it is designed for this, or if I'm supposed to cut the 24V after the valve turns.

Any ideas? I am pretty bad at electrical design.
 
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You could use a couple of Limit Switches

http://www.ustudy.in/sites/default/files/limit_switch.jpg
 
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