4-11
Level Controller Configuration
TUNE THE LOOP
At this point, you should tune the loop according to industry accepted
practices. See “Autotuner” on page 4-12 if you have purchased the
Autotune feature (Option Code CC). If you do not have Autotune
capabilities, follow the instructions in “Set Control Tuning.”
NOTE
You cannot tune the loop if the controller is out-of-service (OOS). You
must change the controller mode to MAN or AUT before tuning the loop.
Set Target Mode
The user can select the mode of the control function to be MAN
(manual), AUT (automatic), or OOS (out-of-service).
In automatic mode the controller output is determined by the control
function, where a control algorithm sets the control output value.
In manual mode the controller output is adjusted by the operator via
digital communications.
In OOS mode, the output remains frozen.
Set Control Tuning
Gain This selection sets the controller gain value. This value is used for all
four control types (P, PI, PID, PD).
Gain is a proportional calculation value (higher numbers result in
larger gain action).
Factory Default: 1.0
Valid Range: 0.0 to 100.0
Reset This selection sets the controller reset value. This value is only used if
the Control Type is set to PI or PID.
This setting is used as the integral time for the PID or PI algorithm
equation.
Rate is an inverse calculation value (smaller numbers result in larger
reset action). However, setting the reset value to 0 turns off the reset
factor.
Factory Default: 0.0 seconds (OFF)
Valid Range: Any value >
0.0
Rate This selection sets the controller rate value. This value is only used if
the Control Type is set to PD or PID.
this setting is used as the derivative time for the PID or PD algorithm
equation.
Rate is a proportional calculation value (higher numbers result in
larger rate action). Setting the rate value to 0 turns off the rate factor.
Factory Default: 0.0 seconds (OFF)
Valid Range: Any value >
0.0
HART Comm.
3, (MAN) (AUT)
(OOS)
HART Comm.
6, 2, 1, 2
HART Comm.
6, 2, 1, 3
HART Comm.
6, 2, 1, 4
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