ARI Armaturen DP34 Tridem EN - Manual (Page 15)

Page 15 0040504001 2010
Operating and installation instructions
Pneumatic actuators - DP34T / DP34Tri
9.0 Troubleshooting
In the event of malfunction or faulty operating performance check that the installation and
adjustment work has been carried out and completed in accordance with these Operating
Instructions.
If malfunctions cannot be eliminate with the help of the following table „10.0
Troubleshooting table“, the supplier or manufacturer should be consulted.
10.0 Troubleshooting table
ATTENTION !
It is essential that the safety regulations are observed when identifying faults.
ATTENTION !
- read point 7.0 and 8.0 prior to dismantling and repair work !
- read point 6.0 before restarting the plant !
Fault Possible causes Corrective measures
Actuator unit does not move No compressed air on the control
pressure line Discern the causes and remedy
Actuator unit has been improperly
installed Check the actuator’s operating
mode and connect to the control
pressure line in accordance to this
operating mode.
The rolling diaphragm is defect Let replace the rolling diaphragm
and springs
Manual emergency adjustment is
blocked Set the manual emergency
adjustment into the correct position
(both position indicators must be at
the starting point and be in the same
position).
There is not enough positioning
force available Wrong spring pieces
(the spring range of the actuator is
wrong) Let replace springs (actuator unit)
Stem sealing has a leak Let renew the stem sealing
The ventilation is plugged and the air
cannot escape from the actuator unit Screw cap must be disengaged
The actuator unit does not ventilate
sufficiently Check the control adjutment