EB 5866 EN 8-1
Malfunctions
8 Malfunctions
Read hazard statements, warnings and caution notes in the 'Safety instructions and mea-
sures' section.
8.1 Troubleshooting
Malfunction Possible reasons Recommended action
Actuator and plug stem
does not move on de-
mand.
Actuator is blocked. Check attachment.
Remove the blockage.
WARNING! A blocked actuator or plug stem (e.g.
due to seizing up after remaining in the same posi-
tion for a long time) can suddenly start to move un-
controllably. Injury to hands or ngers is possible if
they are inserted into the actuator or valve.
Before trying to unblock the actuator or plug stem,
disconnect and lock the air supply or power supply
as well as the control signal. Before unblocking the
actuator, release any stored energy in the actuator
(e.g. spring compression of the Type2780
Pneumatic Actuator). See associated actuator
documentation.
Electric actuators:
No or incorrect supply
voltage connected.
Check the supply voltage and connections.
Pneumatic actuator:
Diaphragm defective
See associated actuator documentation.
Pneumatic actuator:
Signal pressure too low
Check the signal pressure.
Check the signal pressure line for leakage.
Actuator and plug stem
does not stroke through
the entire range.
Electric actuators:
No or incorrect supply
voltage connected.
Check the supply voltage and connections.
Pneumatic actuator:
Signal pressure too low
Check the signal pressure.
Check the signal pressure line for leakage.
The valve leaks to the
atmosphere (fugitive
emissions).
Plug stem seal defective Contact our after-sales service.
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