SERIES EL-940 SPRING RETURN ELECTRIC ACTUATORS A SPRING RETURN electric actuator designed for load requirements up to 1750 "lbs. The actuator comes standard with two auxiliary switches (Form C), an internal tow power heater, a NEMA 4X environmental rating, and in 120/230VAC or 24VAC/DC supply voltages. The EL Series mechanical connections utilize an IS05211 mounting system, size F12 with an 8 point 27mm female drive. control), Jog (floating control) and Proportional (modulating control). Application requirements will dictate whether lo utilize a CW (clockwise spring return) or CCW (counter-clockwise spring return) model. While power is present, the actuator will respond to drive control signals depending on the model chosen. A 2 position unit will drive until it reaches the full end of travel setting opposite the spring return direction. A Jog unit will drive OPEN. CLOSED or HOLD position until it receives a command to move otherwise. A Proportional control unit will follow an analog control signal for positioning and will HOLD until a modified control signal is received. In each of these models a motor brake unit is utilized to HOLD the actuator in position until commanded to move OR a loss of supply voltage. If power is lost or removed at any time, the brake is released and the mechanical spring mechanism returns the actuator to it's normal (unloaded) position. Once the spring mechanism has been released, the actuator will not drive under power again until a) the unit has reached it's fail stop (unloaded) position and b) power has been restored to the actuator. While the actuator is in its fail stop position, the MANUAL HANDLE may be employed to position the actuator anywhere between the UNLOADED and LOADED position and the actuator will HOLD in that position indefinitely, regardless of whether power is present. The MANUAL HANDLE must return the actuator to its fully UNLOADED position BEFORE electrical operation of the actuator will be possible, THIS IS A SAFFTY FFATURE. Additionally if the actuator has been driven electrically to its fully LOADED position, the MANUAL HANDLE cannot be used to drive the actuator back to its fully UNLOADED position, THIS IS ALSO A SAFETY FEATURE. This prevents unexpected release of stored spring energy. Remote indication of actuator status is possible by utilizing built-in auxiliary switches. These dry contacts can show when an actuator has been overridden after power has been restored, indicating the actuator will NOT operate under control again until it has been manually returned to the full Fail-Safe position (explained above).

Application Notes: 1. These actuators are designed to be used in either a horizontal or upright position. Do NOT mount the actuator with the top below a horizontal position. 2. When installing conduit, use proper techniques for entry into the actuator. Use drip loops to prevent conduit condensate from entering the actuator. 3. Both NPT conduit ports MUST use proper equipment to protect the NEMA Ax integrity of the housing. 4 The internal heater is to be used in ALL applications. 5. Do NOT install the actuator outdoors or in humid environments unless it is powered up and the heater is functioning....

Wiring Diagrams for EL-940 Series Field Conlrol Device may be relay conlact. Switch or Vattorc type. Pilot device 10A MAX Auxiliary switches dry type Form C. Terminals accept 12-18ga solid/ stranded wire. On/Off or 2 Position control ts used for damper or valve applications where the requirement is for either fully open or fully closed positioning. This actuator must drive to it's end of travel opposite the spring fail position Loss of control signal or power before reaching it's end of travel will cause the unit to spring OPTKJNAL <J-ttUflU Jog/Floating Control Jog/Floating control is used for...

Wire Sizing Data Switch/Cam arrangement for On/Off control {CW Version shown)