SA304 24V AC-DC 3 Wire 3-point
SA304 provides 24V AC/DC three-wire, three-point or floating-point actuator control with clockwise (CW) and counter-clockwise (CCW) inputs. Powering one control input opens the valve; powering the other closes it. With neither input powered, the actuator stays in its last position.
Wiring Diagram
Wire Connections
Disconnect power before making or changing connections.
- Connect the black wire to DC negative or AC neutral of the 24V supply.
- Connect 24V DC positive or AC phase to the green wire to open the valve.
- Connect 24V DC positive or AC phase to the red wire to close the valve.
- The actuator moves in the selected direction while that control input is powered, until it reaches its travel limit. Removing power from both control inputs leaves it in its current position.
Floating-Point Positioning Example
For a valve with an assumed operating time of 10 seconds for 90° of travel, applying the opening input for 5 seconds moves it approximately 45° open. Removing the input leaves the valve in that position.
Applying the opening input again for more than another 5 seconds moves the valve fully open, where the internal limit switch stops the motor. This is an illustrative timing example, not a specified operating time for every actuator.
Internal Limit Switches
Although the actuator supports floating-point control, the internal motor stops when the fully open or fully closed limit switch is triggered. Keeping the relevant CW or CCW input powered after reaching that limit does not keep the motor rotating.
Floating-point control can serve as a partial alternative to proportional control. Appropriate feedback mechanisms can be used to control the valve's angular position.