Emergency Action - Samson TROVIS 3730-3 Mounting And Operating Instructions

Further troubleshooting
Description of fault
No reading on the display
Actuator moves too slowly
Actuator moves in the wrong direction.
Air leaks from the positioner.
Limit switch does not work properly

9.1 Emergency action

Upon failure of the air supply or electric signal, the positioner vents the actuator, causing the
valve to move to the fail-safe position determined by the actuator. Plant operators are re-
sponsible for emergency action to be taken in the plant.
Tip
Emergency action in the event of valve failure is described in the associated valve documen-
tation.
EB 8484-1 EN
Measures
Î Check electrical connection and power supply.
Î Check the ambient temperature (the display's
operating range is from –30 to +65 °C).
Î Check the supply pressure.
Î Correct setting for filter (transit time).
Î Check the cross-section of the piping and screw
fittings.
Î Check the configuration of the mounting parts.
Î Check the characteristic setting.
Î Check piping.
Î Check the configuration of the mounting parts.
Î Check seals.
Î Check the mounting and cabling.
Î Check polarity of signal wires.
Malfunctions
9-5