Alfa Laval ESE02126-EN, Instruction Manual

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2 Safety
2.4 Loss of air supply
The Unique Control reacts differently to a loss of air supply compared to a regular spring-return actuator. e.g. the LKLA.
The Unique Control does not have a built-in spring to return the actuator to the de-energised position in cases of air supply
failure. Instead, the Unique Control features a built-in check valve that ensures that the actuator remains in the current
position if the air supply fails.
In the case of electrical power failure, the Unique Control responds in the same way as regular actuators installed with con-
trol heads from the ThinkTop series.
Please refer to the table below for an overview of the actuator responses in different error scenarios.
Unique Control Spring-return actuator (LKLA)
Actuator type
Error Scenario
De-energised Energised De-energised Energised Actuator status
Air pressure lost No change No change No change
Actuator changes to
De-energised position
Electrical power lost
No change
Actuator changes to
De-energised position
No change
Actuator changes to
De-energised position
Actuator response
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