16 6.Troubleshooting:
Causes and solutions
ED. 2010/11
6.
Troubleshooting: Causes and solutions
PROBLEM
CAUSE/EFECT
SOLUTION
THE VALVE IS
JERKING
Insufficient air supply
•
Check that the compressed air
circuit bypass valve is open.
•
Check the supply pressure.
•
Insufficient flow.
The actuator is not driving the valve efficiently.
•
Check the compressed air feed
pressure.
•
Replace a pneumatic actuator for
a bigger one.
Excessive line pressure
•
Check the pressure in the
installation and regulate whenever
appropriate.
THE VALVE DOES
NOT OPEN/CLOSE
The compressed air feed is not open.
There is not enough air pressure.
There is air, but the solenoid valve is not working.
Dirt access to the actuator.
•
Open the compressed air passage
towards the control head.
•
Increase the feed air pressure.
•
Check that power is being
supplied.
•
Check the compressed air
pressure and the pipes.
THERE IS NO
POSITION SIGNAL
The detectors do not detect the shaft in position.
•
Adjust the height of the detectors.
•
Check to see that the
detectors/microswitches are
working properly.
AIR LEAK
The air is continuously leaking from inside the head
•
Check all of the pneumatic
connections of the head’s internal
components.
HAMMERING
The shutoff valve is closing very quickly.
•
Fit a flow regulator at the actuator
inlet, in order to control the flow
speed.
WATER HAS GOT
INSIDE
Failure of gasket sealability
•
Tighten the cover and base
screws.
•
Change the base or cover seal, if
necessary.
Checks to be made in the event of a breakdown/repair of or to any particular component:
ELECTRICAL
(the head must be connected to the mains)
•
Check that the proximity detectors are working properly by introducing a metal object into the detection area.
•
Check that the microswitches are working properly by activating the lever with your finger.
(if the status LED comes on this shows that the detector/microswitch is working properly.)
PNEUMATICS
(the compressed air feed must be open).
•
Make sure that there are no air leaks at the pneumatic connections.
•
Check the proper working of the electrically operated valves by activating them manually.
