Honeywell VRX180 user manual Reset #1, Rate #1, PROP. Band #2, Reset #2, Rate #2, SET Timebase

Online Operation Using Menus

Table 7-9 Tune Loop Prompts (continued)

Prompt	Range/Selections		Definition
RESET #1	0.005-99.99 repeats/minute		Determines the period of time for a repeat of the proportional
			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 setpoint. Bumpless manual to automatic
			transfer is canceled when proportional only control is
			selected.
RATE #1	0.02-10.00 minutes	Modifies the loop output based on the rate of change of the
			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.)
PROP. BAND #2			See GAIN #1
RESET #2			See RESET #1
RATE #2		See RATE #1
MANUAL RESET	-100 to +100		This feature functions only when OFF is configured for the
			loop’s RESET parameter. Enter a value equal to the desired
			loop output when the process variable is at setpoint. This
			allows correction of output to account for load changes to
			bring the process variable up to setpoint.
SUPPRESS	YES, NO		This parameter set to YES limits overshoot of the Setpoint
OVERSHOOT			(SP) by the Process Variable (PV) after a disturbance in the
			process such as a load or SP change. Through fuzzy logic,
			the working SP of the control loop is dynamically modified by
			the control algorithm to reduce or eliminate overshoot.
PRETUNE			Pretune calculates optimum values for a loop's Proportional
			Band/Gain, Reset and Rate by analyzing the reaction of the
			loop to a "step change" in setpoint or output. After these
			new tuning values have been calculated you have the option
			of applying (installing) or not applying them to a preselected
			tune set of the loop. You can pretune a loop while another
			loop is pretuning.
			See Pretune Loop on page 238.
SET TIMEBASE	5 MIN, 15 MIN, 30 MIN,		Enter the timebase for the time axis of the tuning trend
	1 HR, 2 HR, 4 HR		display.

236 Video Recorder – User Manual