Malfunctions; Troubleshooting; Emergency Action - Samson 3275A Mounting And Operating Instructions

8 Malfunctions

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

8.1 Troubleshooting

Malfunction
Piston stem does not
move on demand.
Actuator stem does not
stroke through its
complete travel range.
Note
Contact our after‑sales service for malfunctions not listed in the table.

8.2 Emergency action

Plant operators are responsible for emergency action to be taken in the plant.
EB 8314-1 EN
Possible reasons
Actuator is blocked.
Insufficient signal
pressure
Signal pressure not
connected properly.
Insufficient signal
pressure
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.
Injury to hands or fingers is possible if they are
inserted into the actuator or valve.
Before trying to unblock the actuator stem,
disconnect and lock the pneumatic air supply as
well as the control signal.
Check the signal pressure.
Check the signal pressure line for leakage.
See 'Signal pressure routing' in the 'Design and
principle of 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
8-1