Honeywell VRX180 user manual Tune Loop Prompts, Bold items are read-only

Online Operation Using Menus

7.6 Tune Loop

This option lets you tune (change) various loop parameters online. These tunable parameters depend on the loop type in use and are described in Section 4.8, Program Control Loops. Also, the following menu choices are available.

Table 7-9 Tune Loop Prompts

Prompt		Range/Selections		Definition
LOOP TYPE		STD, ADV, SPLIT, ON OFF,		STD: Standard
		CAS P, CAS S, RATIO,		ADV: Advanced
		DIAT		SPLIT: Split Output
				ON OFF: On/Off
				CAS P: Cascade Primary
				CAS S: Cascade Secondary
				RATIO: Ratio
				DIAT: DIAT
PV		Number	Value of PV
OUTPUT		-100 to +100		Loop output %.
SETPOINT SOURCE		SP1 or SP2		Indicates which setpoint is being used by the loop. SP1 must
				be a number; SP2 may be a number or a value from a
				function block (remote setpoint).
Bold items are read-only
TOGGLE SETPOINT		SP1, SP2		Press Enter to change the Setpoint Source from SP1 to SP2
SOURCE				or vice versa.
SETPOINT #1		Number		Enter the new value of SP1.
SETPOINT #2		Number or parameter		Enter the new value of SP2. If SP2 is a remote setpoint you
				cannot change the value here.
PROP. BAND #1				See Gain #1.
GAIN #1	Enter a value of 0.1 to 200			Gain is the proportional gain entry for the control loop (The
		for Gain, or 0.5 to 1000.0 for		value entered here is the gain applied to the error signal to
		Proportional Band. Enter		determine the loop output. For example, a 10% change in
		OFF to allow integral only		process variable (with respect to the input range) from a
		control.		balanced condition will result in a 10% change in output,
				when a gain of 1.0 is used. Enter a starting value at initial
				configuration. The value may be altered Online for final loop
				tuning. If an indirect source is specified as in an adaptive
				gain configuration, the value can only be altered at the
		(Variable Gain1 or PB1 is		source.
		available by programming a		Gain and Proportional Band are interchangeable values
		constant's Destination with
				(Proportional Band = 100/Gain). For loops with dual tuning,
		GN or PB. See Program
				Gain 1 is the gain for the first set of tuning parameters. Gain
		Constants, Section 4.16.)
				2 is for the second set.

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