Analog Input Operation - Hitachi WJ200-001S Instruction Manual

Analog Input Operation

The WJ200 inverters provide for analog input
to command the inverter frequency output
value. The
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 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
= 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
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
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.
analog input terminal
, 2 Watts.

sinking
+V Ref.
group
Voltage input
Current input
A GND
V/I input
select
[AT]
AM H
0 to 9.6 VDC,
0 to 10V nominal
type will not
4 to 19.6 mA DC,
4 to 20mA nominal
See I/O specs on
AM H O OI L

O OI L

4-20 mA
+ -
0-10 V
AM H O OI L
1 to 2k, 2W
AM H O OI L
+ -
AM H O OI L

page 4-6.
487
Freq.
setting