2Overview
38 Festo – P.BE-MPA-EN – 1309f – English
2.5.1 Manual override (MO)
The manual override (MO) enables the valve to be actuated when not electrically activated or ener-
gised. You only need to switch on the compressed air supply.
You should use the manual override mainly when commissioning the pneumatic system in order to
check the function and operation of the valve or the valve-actuator combination.
Actuation types of the manual override
Non-detenting actuation: The valve is activated by pressing the manual override. After the MO is
released, the valve automatically switches by spring force back into the
neutral position.
Detenting actuation: The switching position can be engaged by turning the manual override
clockwise. The manual override remains actuated until it is reset by
hand.
Tab. 2.16 Actuation types of the manual override
The ope ration of the manual override is desc ribed in section 4.3.
The basic logic functions of the manual override can be changed by mounting a co rresponding MO cov-
er cap:
Functions of the MO co ver caps
Cover cap, non-detenting: This cover c ap prevents engaging of the MO. The manual override can
then only be ac tuated in a non-detenting way.
Cover cap, concealed: This cover cap completely covers the MO, which is thus secured against
undesired actuation.
Tab. 2.17 Manual override cover caps
Mounting of the MO cover caps is described in section 4.4.
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