Parameters
Publication PUB088-005-00_1017
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In addition, when tuning the valve positioner the setting can be used to allow the plant dynamics to
stabilise between valve movements.
Not supported by CVA.
7.1.5
Manual Movement Travel (Parameter 7)
Manual Movement Travel sets the amount of valve travel not under motor action that is permitted
before being considered 'Manual Movement'. The setting must be sufficiently large to cover overrun of
position control due to valve inertia. Too small a setting will result in Manual Movement alarms each
time the valve is positioned, particularly if the deadband is small.
7.1.6
Valve Jammed Time (Parameter 8)
Parameter 8 sets the time delay that must elapse without any actuator movement before deciding the
Valve Jammed status bit must be set. Valve Jammed is only announced if the actuator is asked to
move and fails to respond when it should. The time must be long enough to ensure that the valve is
not moving at all.
7.1.7
Watchdog Timeout (Parameter 9)
If the watchdog trips to reset the processor the Watchdog Recovery data bit is set. The data bit will
automatically reset to '0' after the time period set in this parameter register.
7.1.8
Action on Loss of Comms (Parameter 10)
This parameter is used in conjunction with Parameter 11 (Comms Lost Position) and 12 (Comms Fault
Timer).
The Action on Loss of Comms parameter defines the actuator action that will result after the time set
for the Comms Fault Timer (parameter 12) if there is no network communication activity detected by
the PFU.
The action may be
Nothing
(0)
No action, actuator will complete any command in process (the default
setting)
Open
(1)
The actuator will open the valve
Close
(3)
The actuator will close the valve
Stop
(5)
The actuator stops
Position
(7)
The actuator will adjust the valve position to the setting given in the
Comms Lost Position (parameter 11).
7.1.9
Comms Lost Position (Parameter 11)
The setting in this parameter determines the position in the range 0 to 100% that the actuator will
move to if the Profibus network communications stops being received, provided the Action on Loss of
Comms (parameter 10) is set to 'Position'. No action will be taken unless the communication stops for
a period equal or greater than the setting in the Comms Fault Timer (parameter 12).
