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4/00 UDC 3300 Process Controller Product Manual 97
Lower Display
Prompt
Upper Display
Range of Setting
or Selection
Parameter
Definition
FFWDMu FEEDFORWARD MULTIPLIER—Feedforward uses Input
A, following a Ratio and Bias calculation as a value
multiplied directly with the PID computed output value and
sent, as an output value, to the final control element.
(NOTE 1)
The following formula applies:
Controller Output = PID Output x (Input A x Ratio A + Bias A )/Input A Range
RELHUM RELATIVE HUMIDITY—Input 1 reads the wet bulb
temperature. Input 2 reads the dry bulb temperature. Both
inputs must be 100 ohm RTD inputs.
ATTENTION
The Relative Humidity selection will
automatically force both Analog Input actuations to the
100 ohm low setting.
The controller will indicate measured Relative Humidity as
a Process Variable (PV) with a setpoint range of 0 % to
100 % RH.
SUMMER SUMMER WITH RATIO AND BIAS—The following
formula applies:
PV = (Input A x Ratio A + Bias A) + (Input B x Ratio B + Bias B) + (Input C x Ratio C + Bias C)
HI SEL INPUT HIGH SELECT WITH RATIO AND BIAS—This
selection specifies the PV or SP as the higher of Input 1 or
Input 2. The following formula applies:
PV = higher of (Input A x Ratio A + Bias A) or (Input B x Ratio B + Bias B)
LO SEL INPUT LOW SELECT WITH RATIO AND BIAS—This
selection specifies the PV or SP as the lower of Input 1 or
Input 2. The following formula applies:
PV = lower of (Input A x Ratio A + Bias A) or (Input B x Ratio B + Bias B)
MuDIV (note 2)
MULTIPLIER DIVIDER WITH SQUARE ROOT—The
following formula applies:
*PV = K x
(Input B x Ratio B + Bias B)
(Input A x Ratio A + Bias A) x (Input C x Ratio C + Bias C)
x (Calc Hi – Calc Lo)
See Figure 4-1 at the end of this section for an example of Mass Flow
Compensation using Multiplier/Divider Algorithm.
MULT (note 2)
MULTIPLIER WITH SQUARE ROOT—The following
formula applies:
(Input A x Ratio A + Bias A) x (Input C x Ratio C + Bias C) x (Input B x Ratio B + Bias B)*PV = K x x (Calc Hi – Calc Lo)
MuDIV MULTIPLIER DIVIDER—The following formula applies:
*PV = K x
(Input B x Ratio B + Bias B)
(Input A x Ratio A + Bias A) x (Input C x Ratio C + Bias C)
x (Calc Hi – Calc Lo)
MULT MULTIPLIER—The following formula applies:
*PV = K x [(Input A x Ratio A + Bias A) x (Input C x Ratio C + Bias C) x (Input B x Ratio B + Bias B)] x (Calc Hi – Calc Lo)
CARB A CARBON POTENTIAL A—Make this selection if you have
a Cambridge or Marathon monitor type Zirconium Oxide
sensor.