Honeywell UDC2800 User Manual

Function Prompt
Selections or Range of
Setting
Parameter Definition
Three Position Step Control
applications.
The following formula applies:
Controller Output = PID Output +
(Input A x Ratio A + Bias A ) x (100 /
Input A Range)
Feedforward Mult
(Standard feature on
controllers with two
analog inputs)
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.
This algorithm will only function in
automatic mode and is not used for
Three Position Step Control
applications.
The following formula applies:
Controller Output = PID Output x
(Input A x Ratio A + Bias A ) / Input A
Range
Summer
(See Note 2)
Summer with Ratio and Bias —The
following formula applies:
Alg1 = (Input A x Ratio A + Bias A) +
(Input B x Ratio B + Bias B) + (Input
C x Ratio C + Bias C) + Alg1Bias
High Select
(See Note 2)
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:
Alg1 = higher of (Input A x Ratio A +
Bias A) or (Input B x Ratio B + Bias
101
Chapter 4 - Configuration

Honeywell UDC2800 Specifications

General

Control Modes	PID, ON/OFF, Manual
Mounting	Panel Mount
Display	Dual 4-digit LED
Input Types	Thermocouple, RTD, mA, mV, V
Output Types	Relay
Power Supply	100-240 VAC, 50/60 Hz
Communication	RS-485 Modbus RTU
Enclosure Rating	NEMA 4X