Honeywell DR4300 Fsmode Failsafe Mode Auto, Failsafe Latching Disabled When the recorder goes

DR4300 Circular Chart Recorder

Lower Display	Upper Display			Parameter
Prompt	Range of Setting			Definition
	or Selection
FAILSF	0 % to 100 %	FAILSAFE OUTPUT VALUE—Select the value you want
	[factory setting = 0]	the output to be when power is restored after a power
		down. The value used here will also be used as the
		output level if the input fails when input group “BRNOUT”
		parameter is set to “NONE”.
FSMODE		FAILSAFE MODE
	AUTO	Failsafe Latching Disabled – When the recorder goes
		into “Failsafe”, the control mode does not change. The
		output assumes the failsafe value if the recorder is in auto
		mode. When the cause of failsafe is removed, normal
		automatic control action resumes.
	MAN	Failsafe Latching Enabled – When the recorder goes
		into “Failsafe”, the control mode changes to Manual. If the
		recorder was in Auto mode, the output assumes the
		failsafe value. When the cause of failsafe is removed, the
		recorder remains in manual mode.
PBorGN		PROPORTIONAL BAND or GAIN—Use this parameter
		to choose whether you want to specify the proportional
		term in the PIDA or PDMR algorithms in terms of percent
		proportional band or of gain. Your choice here affects
		which tuning prompt, “PB” or “GAIN”, is displayed.
		This parameter is displayed only if the “CTRALG” (control
		algorithm) is set to “PIDA” or “PDMR”.
	PB	Percent proportional band is the percent of the range of
		the measured variable for which a proportional-only
		controller will produce a 100 % change in its output.
	GAIN [factory setting]	Gain is the ratio of output change (%) over the measured
		variable change (%) that caused it.
		The relationship between %PB and gain can be
		expressed as: GAIN = 100
				%PB
		For example, setting PB = 20 % will have the same effect
		on control as setting GAIN = 5. Therefore, if the change in
		the PV input were 3 % of the whole range of possible
		input values, then the resulting change in the output due
		to proportional only control would be 15 % of the output’s
		range, regardless of whether PBorGN = PB and PB = 20,
		or PBorGN = GN and GAIN = 5.
		Another example: Setting PB = 50 % will have the same
		effect as setting GAIN = 2. In this case, if the change in
		input were again 3 % of range, then the resulting output
		change would be 6 %.
			ATTENTION	If the setting of PBorGN is changed,
		you must change the value of the associated tuning
		parameter (“PB” or “GAIN”) if you want to maintain the
		same control action. For example, suppose PBorGN = PB
		and the value of tuning parameter “PB” = 20. If you
		change PBorGN to GAIN, the value of tuning parameter
		“GAIN” will now be 20 (the value formerly assigned to
		“PB”). If you want the same control action you had before,
		you must change the value of “GAIN” to 5.

98 DR4300 Circular Chart Recorder Product Manual 12/03