Emerson Bettis CL-05, User Instructions

Page: 60 / 91

February 2019
User Instructions
MAN-02-04-60-0350-EN Rev. 3
55
Section 7: Parameter Menu
Parameter Menu
7.13 Parameter Group: PID Controller (optional)
The optional PID controller is used for controlling an external actual value (process variable)
to a setpoint using 0/4-20 mA signal by readjusting the actuator.
Table 21. PID Controller Parameter Group (1)
Menu Item
Sub Menu
Item Poss.
Setting
Notes / Comments
P14.1 PID-controller Function
0: disabled PID controller disabled
1: Position
The output of the PID controller corresponds to the
position setpoint of the actuator. The positioning
(tracking of the actual position to the setpoint) is done
by the positioner (see 7.12).
2: Speed
The output of the PID controller corresponds to
the change of the position setpoint (speed) of the
actuator. The positioning (tracking of the actual
position to the setpoint) is done by the positioner
(see 7.12).
5)
P14.2 PID-controller
External
Setpoint
0: fixed
The PID controller uses an internal, fixed setpoint
(see param P14.3).
1: external
The PID controller uses the external setpoint.
The adjustment of this setpoint is done with the
params P13.2 and P13.3 (see 7.12).
P14.3 PID-contoller Fixed setpoint 0 – 100% Specification of the internal fixed setpoint
P14.4 PID-contoller Start (at 0%) 0 - 20,5 mA mA value at 0% of the external actual value
P14.5 PID-controller End (at 100%) 0 - 20,5 mA mA value at 100% of the external actual value
P14.6 PID-contoller Gain (P) +50,0 - 50,0
Gain (proportional value) of the PID-controller. A
negative value reverses the effective direction of the
PID-controller, e.g.: Positive gain: The actuator opens
when the desired value is greater than the external actual
value. Negative gain: The actuator closes when the
desired value is greater than the external actual value.
P14.7 PID-contoller Reset time (I) 0 – 100,0 s
The shorter the reset time (integral time, integral
value), the stronger is the effect of the integral
component of the PID-controller. Values below 1,0 will
disable the integral component.
P14.8 PID-controller Lead time (D) 0 – 100,0 s
The larger the lead time (differential/derivative value),
the stronger is the effect of the dervative component
of the PID-controller. To reduce the influence of noise
a first-order lag element with 1sec time constant is
added (DT
1
)
P14.9 PID-contoller Offset -200 – 200%
The offset value will be added to the output value of
the PID controller.