Honeywell UDC2800 Product Manual page 100

Function Prompt
Increment
Input Math Algorithms —Controllers with two inputs are provided with one input
algorithm. Unless otherwise noted, these selections are provided only as part of the
Math Options package. Each algorithm can be configured to provide a derived
(calculated) PV or a derived Remote Setpoint. Up to three inputs may be applied to
the calculation. See Inputs A, B, and C for definitions per equation.
All algorithms operate in engineering units except Feedforward (F FWRD) which
operates in percent of output units.
ATTENTION: When the Input C configuration is set to NONE, the value of
Input C used in the functions is automatically set to 1.0, except for the
Summer algorithm, where it is set to 0.0.
Input Algorithm 1
Selections or Range of
Setting
Alarm 1
Minutes
Seconds
None
Weighted Average
(See Note 2)
(Standard feature on
controllers with two
analog inputs)
Feedforward
Summer
(Standard feature on
controllers with two
analog inputs)
Chapter 4 - Configuration
Parameter Definition
timer with the keyboard (Run/Hold
key) or Alarm 1.
allows you to increment
Increment
the timer in either minutes or
seconds.
Input Algorithm 1 has the following
selections from which to choose:
No algorithm configured
When you configure for Weighted
Average, the controller will compute
a PV or SP for the control algorithm
from the following equation:
Alg1 = [(Input A x Ratio A + Bias A) +
(K x Input B x Ratio B + Bias B)] / (1
+ K)] + Alg1Bias
Feedforward Summer —Feedforward
uses Input A, following a Ratio and
Bias calculation as a value summed
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
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