
36
7 ND90 71 en
7.5
Notifications
8
TROUBLE SHOOTING
Mechanical/electrical defects
1. A change in the valve position setpoint will not affect the
position of the actuator
Supply pressure too low
Spool valve sticks
Incorrect configuration parameters
Actuator and/or valve jammed
Signal wires incorrectly connected, no value on dis-
play
Circuit boards are defective
Calibration has not been carried out
Device is in manual mode
Prestage is defective
Device is in fail-safe mode
Spool mounted backwards into spool valve
2. The actuator goes to the end position with a small
change of input signal
Tubes between controller and actuator are incorrect,
see Fig. 7 and 8
The parameter settings
PFA
and
ROT
are incorrectly
selected
3. Inaccurate positioning
Spool valve dirty
Too high actuator load
Supply pressure too low
Spool or pressure sensors are defective
Actuator leakage
4. Overshooting or positioning too slow
Change
PERF
value
Spool valve dirty
Supply air tube too small or supply air filter dirty
Valve sticks
Check leakages in tubes between controller and
actuator
Check leakages in mechanical stop screws
5. Error during valve travel calibration
Valve controller is in
MAN
mode
Check the coupling alignment with the pointer, see
Fig. 6.
The parameter settings
PFA
and
ROT
are incorrectly
selected
The actuator or valve did not move or was stuck dur-
ing calibration
Supply pressure too low
Spool valve dirty
Display message
Description
POSITION CALIBRATION
SUCCESSFUL
Position calibration successfully
performed.
LINEARIZATION SUCCESSFUL
3P/9P linearisation successfully
performed.
TEST CANCELLED
Off-line test has been cancelled.
TEST DONE
Off-line test has been successfully
performed.
TEST FAILED
Off-line test failed. Repeat the test
sequence.
CALIBRATION CANCELLED
Calibration has been cancelled.
FACTORY DEFAULTS ACTIVATED
Factory settings activated. Device
have to be configured and
calibrated.
PT NOT ACTIVATED
(Only with position transmitter
option).
The position transmitter is not
energized.
1PT CAL FAILED
1-point calibration failed. Check
the mounting of the valve
controller. Verify input parameter
(range) value. Check rotation
parameter (ROT).
REDUCED PERFORMANCE
DEACTIVATED
Spool valve measurement and
normal valve control is recovered.