Malfunctions; Troubleshooting - Samson 3276-D Mounting And Operating Instructions

7 Malfunctions

Read hazard statements, warnings and caution notes in the 'Safety instructions and mea-
sures' section.

7.1 Troubleshooting

Malfunction
Actuator stem does not
move on demand.
Actuator stem does not
stroke through its com-
plete travel range.
Note
Contact our after-sales service for malfunctions not listed in the table.
EB 8318 EN
Possible reasons
Actuator is blocked.
Insufficient signal pres-
sure
Diaphragm in the actu-
ator defective
Handwheel is not in the
neutral position.
Handwheel is not in the
neutral position.
Insufficient signal pres-
sure
Incorrect setting of
valve accessories.
Recommended action
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.
Check the signal pressure.
Check the signal pressure line for leakage.
See 'Replacing the diaphragm' in the 'Servicing'
section.
See 'Manual mode' in the 'Operation' section.
See 'Manual mode' in the 'Operation' section.
Check the signal pressure.
Check the signal pressure line for leakage.
Check the actuator without valve accessories.
Check the settings of the valve accessories.
Malfunctions
7-1