43
Configuration
Installation, Operation, and Maintenance Manual
ES-09373-1
Configuration
August 17, 2022
8.4
Configuration Menu (Continued)
8.4.4
T OUT Menu
8.4.4.2
Calibration Failure Alarm - Tout Alert
A failure is indicated if the valve does not respond within the time set in the menu.
Three consecutive failures must occur for the positioner to indicate an alarm.
Tout Alert can occur in three cases during the calibration process:
1 - Lack of initial movement:
Let’s assume that Tout was set to 10 seconds, and for some reason during the self
calibration process the actuator does not move its axis, example: lack of air, wrong
pneumatic connection, stuck valve, etc.
When you start the calibration procedure, the Tout time starts counting with the
display indicating 0%, and from this moment on we have the following steps:
A - Display showing 0% - At this point, the positioner will send a command for the
actuator to move to the rest position and wait 10 seconds (Tout set) then it logs
internal fault 1, as there was no movement.
B - Now the display changes to 5% - and the positioner sends a new command for the
actuator to go to position A (example: Open), and after 10 seconds it accumulates
internal fault 2, since there was no movement.
C - Then the display shows 10% - and the positioner sends a new command for the
actuator to move to position B (example: Closed).
D - Tout Alert is triggered generating an initial lack of movement fault. Note that only
after internal faults 1, 2, and 3 is the Tout Alert generated. Notice that it took 30s after
the start of the auto calibration routine, or 3 times the Tout set in the menu, for the
Tout Alert to be generated.
If in this case the Tout set was 120 seconds, the lack of initial movement alarm would
only be generated after 360 seconds.
2 - Actuator pressurization delay condition:
Imagine the case of an actuator that takes 100 seconds to fully open, and starts its
movement only from 90 seconds after the start of pressurization of its chamber.
In this case if the Tout is kept at 10 seconds, the display will indicate the steps 0%, then
5% and 10% and after the initial 30 seconds the Tout Alert will be generated, because
the actuator has not had time to start the movement of its axis, due to lack of pressur-
ization of the chamber.
In situations where this failure condition occurs, it is necessary that the user “reset”
Tout to a minimum value of 100 seconds.
