ARI Armaturen DP34 EN - Manual (Page 27)

0040504000 1210 Page 27
Operating and installation instructions
Pneumatic actuators - DP32 / DP33 / DP34
10.0 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 „11.0
Troubleshooting table“, the supplier or manufacturer should be consulted.
11.0 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 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)
Replace springs (actuator unit)
Stem sealing has a leak 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 adjustment