Parameter Group: Positioner (Optional) - Emerson Bettis RTS FQ Series Operating Manual

User Instructions
MAN-02-04-60-0351-EN Rev. 3
8.12

Parameter Group: Positioner (optional)

The positioner SR option is used to control the electric actuator by means of a set point
input 0/4-20 mA signal. The SR helps control the position of the actuator, i.e. the positioner
ensures that the actual value and thus the position of the actuator matches the desired
set point.
Table 20.
P13.1
P13.2
P13.3
P13.4
P13.5
P13.6
Parameter Menu
Positioner Parameter Group (1)
Sub Menu
Menu Item
Item
Positioner Function
Positioner Begin (at 0%)
Positioner End (at 100%)
Positioner Dead band
Positioner Gain
Live zero
Positioner
detect.
Poss. Set-
Notes / Comments
ting
off Positioner disabled
1: Position mAinput for the position setpoint
2: Pos mAinput for the position setpoint, taking into
valvechar. account the valve characteristic
0 – 20,5
mA value of the setpoint for the CLOSED (0%)
mA
position
{4,0 mA}
0 – 20,5
mA mA value of the setpoint for the OPEN (100%) position
{20,0 mA}
Tolerance range for the control deviation (set point
0,1 –
position - actual position) where no adjustment occurs.
10,0%
The deadband should not be set too low to prevent
{1,0%}
actuator oscillation.
The gain (gradient) affects the positioning close to
the target position. The smaller the gain selected (for
example, 20%), the earlier the actuator starts reducing
its speed in case of speed variable actuators on
1 – 100%
approaching the target position. In case of actuators
{100%}
with fixed speed (reversing starters) the speed reduction
is done by pulsing (also see params P13.9 and P13.10).
This provided a better positioning (smaller reachable
deadband). A 100% setting disables this gradient.
The setpoint monitoring (monitoring the setpoint to
Ignore
below approximately 2mA = loss of signal) is disabled.
Stop Actuator stops on signal failure.
Open On signal failure, actuator moves the OPEN position.
Close Actuator moves on signal failure to the CLOSED position.
Emerg. On signal failure, the actuator moves the defined
pos. emergency position (see parameter P13.7).
Section 8: Parameter Menu
Febraury 2019
52