Hitachi WJ200 Series Instruction Manual page 98

Func.
Name
Code
[AT] selection
A005
[O] input active range start
A011
frequency
[O] input active range end
A012
frequency
[O] input active range start
A013
voltage
[O] input active range end
A014
voltage
[O] input start frequency
A015
enable
Analog input filter
A016
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.
"A" Function
Description
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
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.
The ending point (offset) for the
active analog input range,
range is 0. to 100.
Two options; select codes:
00...Use offset (A011 value)
01...Use 0Hz
Range n = 1 to 31,
1 to 30 : ×2ms filter
31: 500ms fixed filter with ±
0.1kHz hys.
Defaults
Run
Mode
Lnitial data Units
Edit
00 −
0.00 Hz
0.00 Hz
0. %
100. %
01 −
8. Spl.
3−17