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Manual 5020, rev.03 07/2021 - SC/VHS 17
7.3.2 Restoring automatic operation
In addition to the basic instructions enclosed in the specific Instruction Manual 2094, the following
steps, after the restoring of automatic operation, are recommended for actuators used in SIL
applications:
- restore the supply pressure inside the actuator’s cylinder;
- operate the actuator with supply pressure;
- by exhausting the supply pressure check that the actuator is able to reach the fully closed position,
in case of fail close actuator, or the fully open position in case of fail open actuator.
It is possible to verify the correctness of the fully stroked position by checking the position indicator
or limit switches, if fitted.
- In case the actuator is not able to reach fully stroke, verify the position of manual override following
the instructions enclosed in the specific Instruction Manuals.
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