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43
NDX VALVE CONTROLLER
12.8.2
Calibration
To open the main menu, press menu button (if PIN code is
activated, PIN code will be asked when something is tried
to change). Select Calibration and press enter to open
Calibration menu.
There are three different calibration options in the device:
•
Manual Calibration
•
1point Calibration
•
Automatic Calibration
During the calibration the device searches for optimum
internal control parameters for the valve position control.
Also it defines open and close ends. After the calibration
sequence is finished, press enter to get back to the menu
view. You may interrupt the calibration sequences at any
time by pressing back button. then device returns to cal
ibration menu display. Calibration parameters will not be
changed if calibration is cancelled or failed.
Always when calibration is done, it is added to event history
which can be checked with DTM. Also, if calibration is failed,
there is more detailed reason for failure in the event history.
For some reason if calibration fails, device shows that in
the display and event log.
NOTE
If there is no mechanical limit in the actuator
or if it’s not allowed to drive the valve into a
fully open or closed position for some reason,
manual calibration is required.
WARNING
Automatic calibration drives the valve against
the mechanical open and closed travel limits
of the valve actuator assembly. Make sure that
these procedures can be safely executed.
Manual Calibration
After selecting the Manual calibration from the menu, press
enter. Switch the device to manual control mode pressing
enter. Next drive valve manually into open or close end
(depends on installation). After defining end position with
enter there is a warning about automatically moving valve
before tuning part will start. If it is safe to continue, press
enter and arrow keys at the same time as shown in the
display. Display shows progress of the calibration.
After calibration the display shows CALIBRATION SUC
CESSFUL text. Device returns to menu by pressing enter or
automatically to monitoring view after 60 seconds.
1-point Calibration
1point calibration is useful in cases in which the valve controller
needs to be changed but it is not possible to run the normal
calibration. For example the valve is not allowed to change
position because the valve is active.
Before starting 1point calibration check that the valve is
mechanically locked.
Set turning range or stroke length depending on the valve type.
Set approximate actuator stroke volume. Always round your
estimation to a smaller value.
Set current valve position.
Set direction to close valve.
After defining correct settings confirm them and start the
calibration by pressing enter and arrow keys at the same time.
Canceling the calibration at this point will cancel all the settings
you have made.
After calibration the display shows CALIBRATION SUCCESSFUL
text. Press enter to proceed.
After successful calibration the display asks to Switch to auto
matic control mode. Ensure that valve is not mechanically
locked anymore and it’s safe to move the valve before pro
ceeding. Press enter to proceed.
Finally the display reminds to run automatic or manual cali
bration as soon as possible. Press enter to finish.
Manual
Automatic
Finish
Canceling
the calibration
results in
failure
Go to Menu
If Valve type = Rotary
1-point calibration
If Valve type = Linear
12 LOCAL USER INTERFACE (LUI)
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