IM-P713-01 CTLS Issue 1
13
AEL7 Series Electric actuator
3.2 Operational Considerations – End Position and Stroke
Settings
The AEL7 Series actuator typically uses two physical force dependent (torque) switches to determine the
end position of the actuator stroke in both directions i.e. it uses the end stops within the valve in order to
determine stroke.
The force dependent switches do not require any adjustment to correspond to valves with different lengths
of stroke.
The potentiometer and positioner card (when fitted) are set to a predetermined stroke at the factory. This
can be adjusted locally (Sections 5.3 and 5.5) in order to suit the respective valve and provide optimum
position control or feedback.
For the 8-20 kN versions only, valve stroke can be reduced with an internally configured travel dependent
switch (S3). This is used to prevent potential damage to the valve plug and stem in the case when maximum
material strength is exceeded.
Stroke settings for new actuators are identified in Table 2. Optional auxiliary switches, when fitted, do not
impact actuator stroke. Adjustment of the S3 cams can be found in Section 6.2.
Table 2 Actuator Stroke Settings
Actuator Thrust
( kN)
Maximum stroke Set Stroke
(mm)
Positioner or
Potentiometer
Set Stroke
(mm)
Travel
Dependent
Switch S3
AEL71 - - - - - - 1 20 20 - n/a -
AEL72 - - - - - - 2 40 30 - n/a -
AEL73 - - - - - - 4 40 30 - n/a -
AEL74- - - --- 6 50 30 - n/a -
AEL75 - - - - - - 8 60 30 30
AEL76 - - - - - - 12 60 30 30
AEL77 - - - - - - 15 60 30 30
AEL78 - - - - - - 20 100 70 70
3.3 Operational Considerations – Motor Brake
The motor of the AEL7 Series actuator typically slows and stops under its own momentum when the control
power is removed. For the 20 kN version only (AEL78), an electronic brake is used on the motor in order to
reduce inertial overrun and positioning inaccuracy, therefore reducing the wear on the actuator components.
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