Rosemount 3095, Product Manual

Page: 48 / 115

Rosemount Model 3095 Multivariable
™
Level Controller
4-6
Adaptive Bias Control
(ABC) Settings Adaptive Bias Control (ABC) provides a method to create a steady state
deadband for the level controller. Once the desired level is obtained, the
controller could repeatedly open and close the valve for very small
differences between the setpoint and the actual tank level. ABC allows
the controller to determine that the level is stable, and to not change the
valve position except when a larger difference occurs between the
setpoint and the actual tank level. This saves on unnecessary valve wear.
ABC is only available if the control mode is set to P or PD.
Bias is modified when ABC is enabled in Auto mode. See page 3-7 for
details about ABC.
Adaptive Bias Control
This selection enables or disables the ABC algorithm.
Factory Default: Off
Valid Range: On, Off
ABC Static Error
This selection sets the minimum amount that the level must differ from
the setpoint before the ABC algorithm changes the bias level.
This parameter is set in level units.
Factory Default: 1.0 inch
Valid Range: 0.0 to 20 in.
ABC Stability Threshold The stability threshold is the user-defined limit on the rate of change
of level. When inside this limit, the algorithm considers the process
to be stable.
This parameter is set in level units per second.
Factory Default: 1.0 inch per second
Valid Range: 0 – 10 in./sec.
Set Power-Up Output
Power-Up Output The user can set the control output value when the Level Controller
powers up or the Level Controller is reset.
This value is entered as a percentage of controller output. For example,
a power-up output value of 50% corresponds to 12 mA.
(50%
3
(20 – 4 mA) + 4 mA = 12 mA)
Factory Default: 0%
Valid Range: –0.625 to 105% (3.9 to 20.8 mA)
(Saturation Low to Saturation High)
HART Comm. 6, 2, 1, 8
HART Comm. 6, 2, 1, 9
HART Comm. 6, 2, 1
HART Comm. 6, 2, 3, 6