Honeywell UDC3200 - Algorithm Set up Group; Table 3-7 ALGORTHM Group Function Prompts

Configuration
3.7 Algorithm Set Up Group
Introduction
This data deals with various algorithms in the controller and Timer functions.
The Timer section allows you to configure a time-out period and to select the timer start
by either the keyboard (
RUN/HOLD key) or Alarm 2. An optional digital input can also be
configured to the start the timer. The timer display is selectable as either “time
remaining” (see TI REM) or “elapsed time” (see E TIME).
Alarm 1 is activated at the end of the time-out period. When the timer is enabled, it has
exclusive control of the alarm 1 relay—any previous alarm 1 configuration is ignored. At
time-out, the timer is ready to be activated again by whatever action has been configured.
Function Prompts
Table 3-7
ALGORTHM Group Function Prompts
Function Prompt
Lower Display
Selections or
Range of Setting
Upper Display
Parameter
Definition
CONT ALG The CONTROL ALGORITHM lets you select the
type of control that is best for your process.
ON-OFF
ON/OFF is the simplest control type. The output can
be either ON (100 %) or OFF (0 %). The Process
Variable (PV) is compared with the setpoint (SP) to
determine the sign of the error (ERROR = PV–SP).
The ON/OFF algorithm operates on the sign of the
error signal.
In Direct Acting Control, when the error signal is
positive, the output is 100 %; and when the error
signal is negative, the output is 0 %. If the control
action is reverse, the opposite is true. An adjustable
overlap (Hysteresis Band) is provided between the
on and off states.
ATTENTION Other prompts affected: OUT HYST
DUPLEX ON/OFF is an extension of this algorithm
when the output is configured for a Duplex control
algorithm. It allows the operation of a second
ON/OFF output. There is a deadband between the
operating ranges of the two inputs and an adjustable
overlap (hysteresis) of the on and off states of each
output. Both Deadband and Hysteresis are
separately adjustable. With no relay action the
controller will read 50 %.
ATTENTION Other prompts affected: OUT HYST
and DEADBAND
50 UDC3200 Universal Digital Controller Product Manual 12/04