Honeywell UDC2500 manual Algorithm Set Up Group, Ctralg, 401, Onof, Other prompts affected

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 TREM) or “elapsed time” (see ET).

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 ALGOR Group (Numeric Code 400) Function Prompts

Function Prompt		Selection or Range of Setting			Parameter
Lower Display		Upper Display			Definition
English	Numeric	English	Numeric
	Code		Code
CTRALG	401			The CONTROL ALGORITHM lets you select
				the type of control that is best for your
				process.
		ONOF	0	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.
					Other prompts affected:
				ATTENTION
				OUTHYS

46 UDC2500 Universal Digital Controller Product Manual 4/07