rotork Mk3 - Editing the Foundation Specific Parameters 1-23 and 99; Editing the Actuator Setup Parameters 50-67

Foundation Fieldbus CP Option Card Technical Manual
54 of 116 Publication PUB089-005-00_0618
6.2.3 Editing the Foundation specific parameters 1-23 and 99
These parameters include settings that will be specific to the application and the method of control
adopted for the network as a whole. Some are related to standard FF functions and are not described
here. Completing the fields listed below will assist on site diagnostics on the installed system by
relaying field data to the control room.
Index 2
TAG_DESC
Enter the tag number allocated to the device
Index 14
ACT_MODEL
Select the type of actuator that the FF CP card is fitted into
from the list
Index 15
ACT_SN
The actuator serial number should be entered in this field.
The serial number appears on the actuator label
Index 20
VALVE_MAN_ID
The name of the valve manufacturer may be entered
Index 21
VALVE_MODEL_NUM
The valve manufacturer’s model number may be entered
Index 22
VALVE_SN
The valve serial number should be entered in this field
Index 23
VALVE_TYPE
For example – Gate, Butterfly, may be entered
6.2.4 Editing the actuator setup parameters 50-66
The actuator control performance is determined by a number of settings in this group of parameters.
When using direct editing of these parameters, close attention should be paid to the function of each.
Entering unsuitable values may result in difficulty in controlling the actuator. The parameters are
described with their Index numbers.
 Index 50 and 51 Limited Range Position Minimum and Maximum
These parameters are used to define the positions in the range of valve travel that will be reported as
0 to 100% if the whole travel from the closed position to the open position is not used. In addition, the
position demand set-point output value will also be modified to follow this limited range.
It is possible to make the position data reported and the position controller relate to a reduced span of
actual valve travel. In this mode the position data relates to the reduced portion of the valve stroke.
This is sometimes used where the valve is required to have a 0% position (or 100% position) that is
not the same as the fully closed position (or fully open position). These parameters define the actual
limited range of valve travel that will be used for the position reporting and control by the positioner.
Note that the digital open and close commands will still make the valve travel over its full stroke. The
special case analogue commands of 0% and 100% that would otherwise cause the actuator to travel
to the limit switch or torque off positions are inhibited if values other than 0 and 100 are set in these
parameters.
The values inserted relate to the maximum total valve travel between closed and open and represent
the point in the full stroke which will now be used for the limited stroke 0 and 100 values.
0% ----------------- Reported Position --------------------- 100%
Valve Stroke
CLOSED
OPEN

Position Minimum Setting

Position Maximum Setting
Fig 6.3: Limited Range Position Control and Reporting