Analog Input Operation - Hitachi WJ200 Series Quick Reference Manual

Analog Input Operation

The WJ200 inverters provide for analog input to
command the inverter frequency output value.
The analog input terminal group includes the [L],
[OI], [O], and [H] terminals on the control
connector, which provide for Voltage [O] or
Current [OI] input. All analog input signals must
use the analog ground [L].
If you use either the voltage or current analog
input, you must select one of them using the logic
input terminal function [AT] analog type. Refer to
the table on next page showing the activation of
each analog input by combination of
parameter and [AT] terminal condition. The [AT]
terminal function is covered in
Current/Voltage Select" in section
that you must also set
input as the frequency source.
NOTE: If no logic input terminal is configured for the [AT] function, then inverter recognizes
that [AT]=OFF and MCU recognizes [O]+[OI] as analog input.
Using an external potentiometer is a common way to
control the inverter output frequency (and a good way
to learn how to use the analog inputs). The
potentiometer uses the built-in 10V reference [H] and
the analog ground [L] for excitation, and the voltage
input [O] for the signal. By default, the [AT] terminal
selects the voltage input when it is OFF.
Take care to use the proper resistance for the
potentiometer, which is 1~2 k
Voltage Input – The voltage input circuit uses
terminals [L] and [O]. Attach the signal cable's
shield wire only to terminal [L] on the inverter.
Maintain the voltage within specifications (do not
apply negative voltage).
Current Input – The current input circuit uses
terminals [OI] and [L]. The current comes from a
sourcing type transmitter; a sinking type will not
work! This means the current must flow into
terminal [OI], and terminal [L] is the return back to
the transmitter. The input impedance from [OI] to
[L] is 100 Ohms. Attach the cable shield wire only
to terminal [L] on the inverter.
A005
"Analog Input
4. Remember
A001 = 01 to select analog
Ω , 2 Watts.
41
AM H
+V Ref.
Voltage input
Current input
A GND
V/I input
select
[AT]
set
AM H O OI L
+ -
AM H O OI L
1 to 2kΩ, 2W
AM H
0 to 9.6 VDC,
0 to 10V nominal
AM H
4 to 19.6 mA DC,
4 to 20mA nominal
See I/O specs on
O OI L
A001
Freq.
setting
4-20 mA
0-10 V
O OI L
+ -
O OI L
page 4-6.