SERIES-EL-930-ELECTRIC-ACTUATOR0 pages

SERIES EL-930 SPRING RETURN

ELECTRIC ACTUATORS

A SPRING RETURN electric actuator designed tor load requirements up to

450'lbs. The actuator comes standard with two auxiliary switches (Form C>, an

internal low 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 F07 with an 8 point 17mm female drive.

The EL Series is offered in three different control modes ...On/Off (2 position

control), Jog (floating control) and Proportional (modulating control). Application

requirements will dictate whether to utilize a CW (clockwise spring return) or

CCW (counter-clockwise spring return) model.

Theory of Operation

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 it's 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 FFATURF 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).