Honeywell UDC2500 manual Deviation Process Variable, 0PCT, Auxiliary Output LOW Scaling

Configuration

Function Prompt		Selection or Range of Setting		Parameter
Lower Display		Upper Display		Definition
English	Numeric	English	Numeric
	Code		Code
		DEV	4	DEVIATION (PROCESS VARIABLE
				MINUS SETPOINT)—Represents –100 %
				to +100 % of the selected PV span in
				engineering units.
				Zero deviation will produce a center scale
				(12 mA or 50 %) output. A negative deviation
				equal in magnitude to the Auxiliary Output
				High Scaling Factor will produce a low end
				output (4 mA or 0 %) output. A positive
				deviation equal in magnitude to the Auxiliary
				Output Low Scaling Factor will produce a
				high end output (20 mA or 100 %).
				FOR EXAMPLE:
				Input 1 = Type T High Thermocouple
				PV range = –300 °F to +700 °F
				PV span = 1000 °F
				Deviation Range = –1000 °F to +1000 °F
				Auxiliary Output Low Scale Value = 0.0
				Auxiliary Output High Scale Value = 1000
				If PV = 500 °F and SP = 650 °F
				then Deviation Display = –150 °F, which
				is
				–7.5% of the Deviation Range, so
				Auxiliary Output = 50% – 7.5% = 42.5%
		OUT	5	OUTPUT—Represents the displayed
				controller output in percent (%). Cannot be
				used with
				Three Position Step Control.
		SP	6	SETPOINT—Represents the value of the
				setpoint currently in use and is shown in the
				same units as those used by the PV.
		LSP 1	7	LOCAL SETPOINT ONE—Auxiliary output
				represents Local Setpoint 1 regardless of
				active setpoint.
		LSP 2	8	LOCAL SETPOINT TWO—Auxiliary output
				represents Local Setpoint 2 regardless of
				active setpoint.
0PCT	902	Value in		AUXILIARY OUTPUT LOW SCALING
		Engineering Units		FACTOR— This is a value in engineering
				units used to represent all AUX OUT
				parameters except Output.
				For Output, this is a value in percent and can
				be any value between –5 % and +105 %.
				However, keep in mind that relay output
				types can only be scaled 0 % to 100 %.

68 UDC2500 Universal Digital Controller Product Manual 4/07