Hitachi WJ200 Series Software, Instruction Manual

Page: 98 / 420

3
−
17
“A” Function Run
Mode
Edit
Defaults
Func.
Code
Name Description Lnitial data Units
A005
[AT] selection Three options; select codes:
00
...Select between [O] and [OI]
at [AT] (ON=OI, OFF=O)
02
...Select between [O] and
external POT at [AT]
(ON=POT, OFF=O)
03
...Select between [OI] and
external POT at [AT]
(ON=POT, OFF=OI)
The output frequency
corresponding to the analog
input range starting point,
range is 0.00 to 400.0
U 00 −
A011
[O] input active range start
frequency
U 0.00 Hz
A012
[O] input active range end
frequency The output frequency
corresponding to the analog
input range ending point,
range is 0.0 to 400.0
The starting point (offset) for
the active analog input range,
range is 0. to 100.
U 0.00 Hz
A013
[O] input active range start
voltage
U 0. %
A014
[O] input active range end
voltage
The ending point (offset) for the
active analog input range,
range is 0. to 100.
U
100. %
A015
[O] input start frequency
enable
Two options; select codes:
00
… Use offset (
A011
value)
01
…
Use 0Hz
U
01 −
A016
Analog input filter Range n = 1 to 31,
1 to 30 :
×
2ms filter
31: 500ms fixed filter with
±
0.1kHz hys.
U
8. Spl.
A016
:
External Frequency Filter Time Constant –
This filter smoothes the analog input
signal for the inverter’s output frequency reference.
・
A016
sets the filter range from n=
1
to
30
. This is a simple moving average calculation,
where n (number of samples) is variable.
・
A016
=
31
is a special value. It configures the inverter to use a movable deadband
feature. Initially the inverter uses the 500ms of filter time constant. 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 change.
When a 30-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.
The example graph below shoes a typical analog input waveform. The filter removes
the noise spikes. When a speed change (such as level increase) occurs, the filter
naturally has a delayed response. Due to the deadband feature (
A016
=
31
), the final
output changes only when the 30-sample average moves past the deadband threshold.