Honeywell UDC 3300 manual Relhum, Summer with Ratio and BIAS- The following

Lower Display

Prompt

Upper Display		Parameter
Range of Setting		Definition
or Selection
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:

	(Input A x Ratio A + Bias A) x (Input C x Ratio C + Bias C)
*PV = K x		x (Calc Hi – Calc Lo)
	(Input B x Ratio B + Bias B)

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:

*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)

MuDIV

MULTIPLIER DIVIDER—The following formula applies:

*PV = K x	(Input A x Ratio A + Bias A) x (Input C x Ratio C + Bias C)
		x (Calc Hi – Calc Lo)
	(Input B x Ratio B + Bias B)

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.

4/00 UDC 3300 Process Controller Product Manual 97