Hitachi L100 - Manual (Page 67)

L100 Inverter
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3–11
Analog Input Settings
The inverter has the capability to accept an external analog input that can command the
output frequency to the motor. Voltage input (0 –10V) and current input (4–20mA) are
available on separate terminals (“O” and “OI,” respectively). The analog input settings
add scaling and offset adjustments between the analog input and the frequency output.
In the graph below (left), A13 and A14 select the active portion of the input voltage or
current range. The parameters A11 and A12 select the start and end frequency of the
converted output frequency range, respectively. Together, these four parameters define a
line segment as shown (below, right). When the line does not begin at the origin, A15
defines whether the inverter outputs 0Hz or the A11frequency when the analog input
value is less than the A13 setting (determines the non-linear part of the translation).
Frequency
10V
20mA
A13 A14
0V
4mA
A11
A12
A15 = 00
A15 = 01
Frequency
% input
scale
10V
20mA
A13 A14
0V
4mA
A11
A12
% input
scale
0 Hz
“A” Function
Run-
time
Edit
Defaults DOP,DRW,DOP+
Func.
Code
Name Description
EU/
US
Units
Func.
Code
Name
A11 External frequency
output zero reference The output frequency corre-
sponding to the analog input
range starting point ✘ 0
Hz
F-31 IN EXS
A12 External frequency
output span reference The output frequency corre-
sponding to the analog input
range ending point ✘ 0
Hz
F-31 IN EXE
A13 External frequency
input bias start The starting point (offset) for
the active analog input range ✘ 0
%
F-31 IN EX%S
A14 External frequency
input bias end The ending point (offset) for
the active analog input range ✘ 100
%
F-31 IN EX%E
A15 External frequency
offset enable Two options; select codes:
00... Use offset (A11 value)
01... Use 0 Hz ✘ 01 — F-31 IN
LEVEL
A16 External frequency
filter time constant Range n = 1 to 8, where n =
number of samples for avg. ✘ 8 Sam-
ples
F-31 IN
F-SAMP
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