Samson EB 31a-23, Mounting And Operating Instructions

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8-1
EB 31a-23_EN
Edition: November 2021
Speci
fi cations subject to change
Malfunctions
8 Malfunctions
The work described in this section is only to be performed by fully trained and quali fi ed personnel.
8.1 Troubleshooting
Malfunction Possible reasons Recommended action
Uneven rotation
Inadequate supply Check the supply system and make sure that the supply pressure is correct.
Missing lubricant
Disassemble the actuator, lubricate all the sliding parts and reassemble the ac-
tuator.
Worn components
Disassemble the actuator, inspect and replace the worn/damaged compo-
nents.
Control system
Make sure the control system components are correctly assembled. Check the
control system documentation and contact the manufacturer.
Faulty valve
In case of actuator mounted over the valve, check the valve documentation
and contact the manufacturer.
Incomplete rotation
Incorrect stroke adjustment Follow the indications in section 9.5.8 for correct stroke adjustment.
Foreign object left inside Disassemble the actuator, inspect and remove any foreign object.
Incorrect assembly after maintenance Disassemble and reassemble the actuator correctly.
Hydraulic circuit blocked, compressed or
with speed control valve problems Check all the tubing and fi ttings, remove any foreign object/damaged compo-
nent.
Control system
Make sure the control system components are correctly assembled. Check the
control system documentation and contact the manufacturer.
Faulty valve
In case of actuator mounted over the valve, check the valve documentation
and contact the manufacturer.
Loss of power
Inadequate supply pressure Check the control system and make sure that the supply pressure is correct.
Supply pipe blocked, compressed or with
sealing problems Check all the tubing and fi ttings, remove any foreign object/damaged compo-
nent.
Actuator seals leakage Disassemble the actuator, inspect and replace any damaged seals.
blocked air exhaust hole Remove plugs or foreign objects from the exhaust hole.
Faulty valve
In case of actuator mounted over the valve, check the valve documentation
and contact the manufacturer.
Uneven deceleration Missing hydraulic oil Make sure the HCD chambers bodies are correctly fi lled.
− Contact PFEIFFER after-sales service for malfunctions not listed
in the table.
− Spare parts are to be ordered with all information acc. to the
identi
fi cation of the actuator. Only original parts from PFEIFFER
Chemie-Armaturenbau GmbH may be installed.
8.2 Emergency action
The plant operator is responsible for emergency action to be tak-
en in the plant.
Note