Malfunction; Detecting And Rectifying Errors - Samson EB 31a Mounting And Operating Instructions

8

Malfunction

When rectifying the faults, chapter "1 Safety instructions and safety measures" must be observed.

8.1 Detecting and rectifying errors

Type of fault
The actuator shaft does not
move even if requested.
Uneven rotation
Incomplete rotation
EB 31a_EN
December 2022 edition
Subject to technical changes
Possible cause
The actuator is mechanically
blocked.
The signal pressure is not
suffi cient.
Signal pressure not connected
to the correct port ("2" or "4").
Defective pistons or seals in the
actuator.
The signal pressure is not
suffi cient
Lack of lubricant
Worn components
Control system
Defective valve
Incorrect end position
adjustment
Foreign material inside
Incorrect assembly after
maintenance
Control system
Defective valve
Check the installation.
Remove the blockage, see Chapter "1 Safety instructions and safety measures".
WARNING!
A blocked actuator shaft (e.g. due to "seizure" if not actuated for a long period of
time) can release unexpectedly and move uncontrolled. This can lead to crushing if
reaching into them.
Before trying to release a blockage of the actuator shaft, interrupt and lock the
pneumatic energy and the control signal. Release the residual energy from the
actuator (spring tension) before freeing the blockage, see chapter "11.1 Releasing
the spring tension in the actuator".
Check the signal pressure.
Check the signal pressure line for leaks.
Connect the signal pressure, see Chapter "5.4 Establishing the pneumatic
connection"
Disassemble the rotary actuator, lubricate all sliding parts, see chapter "1 Safety
instructions and safety measures".
Replace the pistons and seals, see Chapter "12.1 Replacing defective components"
Check the supply system and ensure the correct signal pressure.
Disassemble the rotary actuator, lubricate all sliding parts, see chapter "1 Safety
instructions and safety measures".
For the recommended lubricant, see Chapter "15.1.2 Lubricant"
For the required repair instructions, see Chapter "12 Repairs".
Repairs are necessary.
Disassemble the rotary actuator, see chapter "1 Safety instructions and safety
measures".
Request spare parts from PFEIFFER Chemie-Armaturenbau GmbH, see Chapter
"15.2 Spare parts and wear parts".
For the required repair instructions, see Chapter "12 Repairs".
Check the correct assembly of the control system components.
Check the control system documentation and contact the manufacturer.
Disconnect the connection to the control pressure.
Remove the actuator from the valve (observe the "Safety instructions and safety
measures", see the included valve manuals).
Check the valve documentation and contact the manufacturer.
Observe the notes for the correct end position adjustment, see Chapter "3.14.6 End
position adjustment for the standard actuator".
Disassemble the rotary actuator, see chapter "1 Safety instructions and safety
measures".
Remove any foreign material.
For the required repair instructions, see Chapter "12 Repairs".
Disassemble the rotary actuator, see chapter "1 Safety instructions and safety
measures".
Assemble the rotary actuator correctly.
For the required repair instructions, see chapter "3.14 Rotary actuator assembly"
and "12 Repairs".
Check the correct assembly of the control system components.
Check the control system documentation and contact the manufacturer.
Disconnect the connection to the control pressure.
Remove the actuator from the valve (observe the "Safety instructions and safety
measures", see the included valve manuals).
Check the valve documentation and contact the manufacturer.
Measures
Malfunction
8-1