Honeywell VRX180 user manual RATE#2, RESET#1, Reset Limit, Ratio Bias

		Programming Function Blocks and Features
	Table 4-10 Loop Prompts (continued)
Prompt	Range/Selections	Definition
RATE#1 &	0.02-10.00 minutes	Modifies the loop output based on the rate of change of the
RATE#2		process variable. The output is modified by a value that
		assumes the rate of change of the process variable will
		continue for the time period specified. Enter a starting value
		or OFF at the time of configuration. The value may be altered
		Online for final loop tuning. For loops with dual tuning, Rate 1
		is the rate for the first set of tuning parameters. Rate 2 is for
		the second set. (Variable Rate1 is available by programming
		a constant's Destination with RT. Program Constants, Section
		4.16.)
RESET#1 &	0.005-99.99 repeats/minute	Determines the period of time for a repeat of the proportional
RESET#2		gain output. Enter a starting value at initial configuration. The
		value may be altered Online for final loop tuning. For loops
		with dual tuning, Reset 1 is the time for the first set of tuning
		parameters. Reset 2 is for the second set. (Variable Reset1
		is available by programming a constant's Destination with RS.
		See Program Constants, Section 4.16.)
		A value of OFF may be entered to allow proportional-only
		control. When turned off, the manual reset value determines
		the loop output at set point. Bumpless manual to automatic
		transfer is canceled when proportional only control is
		selected.
RESET LIMIT	OFF or 100 to 200%.	This value restricts the calculated integral value of the loop
		during Cold Start or on a manual-to-automatic transfer.
RATIO BIAS		Enter a bias value to be used in calculating the working set
		point of the ratio control loop. This is essentially a value that
		will be added to the product that results when RATIO
		SETPOINT is multiplied by the ratio loop’s wild variable input
		value. For example, in the fuel-air ratio control scenario
		introduced in the RATIO SETPOINT section, suppose fuel
		flow is the wild variable that measured to be 60. With the
		RATIO SETPOINT prompt set to 0.5, the result will be 30
		when the RATIO SETPOINT is multiplied by the fuel flow. If
		the RATIO BIAS prompt is then set to 10, the actual set point
		that the ratio loop will use to control air flow will be 30 + 10 =
		40.
		To make a ratio control loop’s working set point equal to:
		(RATIO SETPOINT x Wild Variable value) + RATIO BIAS
		the loop’s working set point must be toggled to SP2 using the
		“SP (Set Point select)” key while viewing the loop’s ON LINE
		display. Refer to Figure 4-1.

Video Recorder – User Manual 97