Self-calibration
When operating voltage is applied, the actuators self-calibrate (fully retracted ➙ fully
extended ➙ setpoint).
Never intervene manually during self-calibration.
● Correct calibration is only possible with valve stroke > 0.05 inch (1.2 mm). Valve stroke
< 0.05 inch (1.2 mm) results in calibration failure.
● If calibration fails, the actuator performs another calibration automatically after
10 seconds.
● After three failed calibration attempts, the actuator stem remains in the extended
position and the valves are open.
Electrical fail-safe function (for SSC161.35U, SSC131.39U only)
When first connected to power, or after a power failure, the capacitor which stores energy for
the fail-safe function will be charged. This process takes up to 180 seconds. While the
capacitor is being charged, the actuator cannot respond to any control signals.
In the event of a power failure of more than 5 seconds, the actuator will return to its fail-safe
position within 30 seconds.
Manual operation
A 3-mm Allen wrench can be used to move the actuator to any position.
To move the actuator stem manually
1. Open the cover using a proper screwdriver.
2. Press and hold down button (a) illustrated below for at least three seconds.
– The actuator ignores any control signal from the controller.
Power
On
Calibration
Y
t
Fully retracted
Fully extended
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