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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 A005 set
parameter and [AT] terminal condition. The [AT]
terminal function is covered in “Analog Input
Current/Voltage Select” in section 4. Remember
that you must also set A001 = 01 to select analog
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
Ω, 2 Watts.
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.
AM H O OI L
+V Ref.
Voltage input
Current input
A
GND
AM H O OI L
Freq.
settin
g
A001
V/I input
select
[AT]
+
-
4-20 mA
0-10 V
AM H O OI L
1 to 2kΩ, 2W
0 to 9.6 VDC,
0 to 10V nominal
AM H O OI L
+
-
4 to 19.6 mA DC,
4 to 20mA nominal
AM H O OI L
See I/O specs on page 21,22.