Samson 3275A, Монтаж и эксплуатация, Страница: 31 / 52

EB 8314-1 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
Piston 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.
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.
Insufficient signal
pressure
Check the signal pressure.
Check the signal pressure line for leakage.
Signal pressure not
connected properly.
See 'Signal pressure routing' in the 'Design and
principle of operation' section.
Actuator stem does not
stroke through its
complete travel range.
Insufficient signal
pressure
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.
8.2 Emergency action
Plant operators are responsible for emergency action to be taken in the plant.
Note