rotork CK Series User Manual

Profibus Installation Manual
42
7.1.3 Motion Inhibit Timer (Parameter 6)
The Motion Inhibit Timer setting is the period that must
elapse between consecutive starts of the actuator motor
when in positioning mode. The idle period will prevent the
actuator motor from exceeding its rated number of starts
per hour.
In addition, when tuning the valve positioner the setting can
be used to allow the plant dynamics to stabilise between
valve movements.
7.1.4 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.
7.1.5 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.
7.1.6 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.
7.1.7 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).
7.1.8 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).
7.1.9 Comms Fault Timer (Parameter 12)
Parameter 12, the Comms Fault Timer setting, determines
the number of seconds that network communication must
be absent before the setting for the Fault Mode will be
carried out.
Parameters
A4US
US
A4
US A4
US
A4

rotork CK Series Specifications

General

Brand	rotork
Model	CK Series
Category	Controller
Language	English