Hitachi L2002 Run, –FU, Mode, Func, Name, Edit, Code, (EU), Lo Hi, (USA), A016:, –FE(F), Description, SRW Display, “A” Function, External Frequency Filter Time Constant –

3–15

L2002 Inverter

		“A” Function		Run		Defaults
				Mode
Func.	Name /				–FE(F)	–FU
			Description	Edit			Units
Code	SRW Display			Lo Hi	(EU)	(USA)
A005	[AT] selection		Four options, select codes:	✘ ✔	00	00	Hz
			00 .. Select between [O] and
	AT-Slct	O/OI
			[OI] at [AT]
			01 .. [O] + [OI] ([AT] input is
			ignored)
			02 .. Select between [O] and
			keypad potentiometer
			03 .. Select between [OI] and
			keypad potentiometer
A011	O–L input active range		The output frequency corre-	✘ ✔	0.0	0.0	Hz
	start frequency		sponding to the analog input
			range starting point,
	O-EXS	0000.0Hz
			range is 0.0 to 400.0
A012	O–L input active range		The output frequency corre-	✘ ✔	0.0	0.0	Hz
	end frequency		sponding to the analog input
			range ending point,
	O-EXE	0000.0Hz
			range is 0.0 to 400.0
A013	O–L input active range		The starting point (offset) for	✘ ✔	0.	0.	%	Configuring ParametersDrive
	start voltage		the active analog input range,
			range is 0. to 100.
	O-EX%S	00000%
A014	O–L input active range		The ending point (offset) for	✘ ✔	100.	100.	%
	end voltage		the active analog input range,
			range is 0. to 100.
	O-EX%E	00100%
A015	O–L input start		Two options; select codes:	✘ ✔	01	01	—
	frequency enable		00 .. Use offset (A011 value)
			01 .. Use 0 Hz
	O-LVL	0Hz
A016	External frequency		One range plus one setting:	✘ ✔	2.	8.	Sam-
	filter time constant		01 to 16... Moving average,				ples
			where n=1 to 16 (number of
	F-SAMP	00008
			samples for average)
			17 .. Use 16-sample average,
			plus deadband +0.1/–0.2Hz.
	A016: External Frequency Filter Time Constant – This filter smooths the analog input signal

for the inverter’s output frequency reference.

•A016 sets the filter range n=1 to 16. This is a simple moving average calculation, where n (number of samples) is variable.

•A016 = 17 is a special value. It configures the inverter to use a moveable deadband feature. Initially the inverter uses the average of the previous 16 samples. Then, the deadband is employed for each subsequent average of 16 samples. The deadband works by ignoring small fluctuations in each new average: less than +0.1Hz or –0.2Hz change. When a 16-sample average exceeds this deadband, then the inverter applies that average to the output frequency reference, and it also becomes the new deadband comparison point for subsequent sample averages.