Samson 3276-D, Mounting And Operating Instructions

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EB 8318 EN 7-1
Malfunctions
7 Malfunctions
Read hazard statements, warnings and caution notes in the 'Safety instructions and mea-
sures' section.
7.1 Troubleshooting
Malfunction Possible reasons Recommended action
Actuator stem does not
move on demand.
Actuator is blocked. Check attachment.
Remove the blockage.
WARNING! A blocked actuator (e.g. due to seizing
up after remaining in the same position for a long
time) can suddenly start to move uncontrollably. In-
jury to hands or fingers is possible if they are insert-
ed into the actuator or valve.
Before trying to unblock the actuator stem, discon-
nect and lock the pneumatic air supply as well as
the control signal. Before unblocking the actuator
stem, release any stored energy in the actuator (e.g.
spring compression). See 'Relieving the spring com-
pression in the actuator' in the 'Removal' section.
Insufficient signal pres-
sure
Check the signal pressure.
Check the signal pressure line for leakage.
Diaphragm in the actu-
ator defective
See 'Replacing the diaphragm' in the 'Servicing'
section.
Handwheel is not in the
neutral position.
See 'Manual mode' in the 'Operation' section.
Actuator stem does not
stroke through its com-
plete travel range.
Handwheel is not in the
neutral position.
See 'Manual mode' in the 'Operation' section.
Insufficient signal pres-
sure
Check the signal pressure.
Check the signal pressure line for leakage.
Incorrect setting of
valve accessories.
Check the actuator without valve accessories.
Check the settings of the valve accessories.
Contact our after-sales service for malfunctions not listed in the table.
Note