The EN44C2 and EN88C2 direct coupled 24 VAC non-spring return rotary electronic actuators are designed for tri-state (floating) control or two position control (with external relay) of valves and dampers. They may be used in applications requiring up to 44 in-lb (5 N-m) of torque or 88 in-lb (10 N-m) of torque.

Models EN44B2 and EN88B2 direct coupled 24 VAC non-spring return rotary electronic actuators are designed for modulating control of dampers or valves. They may be used in applications requiring up to 44 in-lb (5 N-m) of torque or 88 in-lb (10 N-m) of torque.

OPERATION
Two Position or Tri-state: A floating control signal controls the actuator. The actuator’s angle of rotation is proportional to the length of time the signal is applied. A 24 VAC control signal to wire 6 causes the actuator coupling to rotate clockwise.  A 24 VAC control signal to wire 7 causes the actuator coupling to rotate counterclockwise. In the event of a power failure, or with no control voltage, the actuator holds its current position.

An improperly-tuned control loop will cause excessive repositioning that will shorten the life of the actuator.

Modulating Type: A continuous 0 to 10 VDC signal from a controller to wire 8 operates the actuator. The angle of rotation is proportional to the control signal. A 0 to 10 VDC position feedback output signal is available between wires 9 and wire 2 (com) to monitor the position of the motor.

In the event of a power failure the actuator holds its position.  In the event only the control signal is lost, the actuator returns to the “0” position.