Hitachi hitachi series inverter 用户手册
41
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].
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
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
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.
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
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).
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.
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.
setting
setting
A001
V/I input
select
select
[AT]
+ -
4-20 mA
0-10 V
AM H O OI L
1 to 2k
Ω, 2W
0 to 9.6 VDC,
0 to 10V nominal
0 to 10V nominal
AM H O OI L
+ -
4 to 19.6 mA DC,
4 to 20mA nominal
4 to 20mA nominal
AM H O OI L
See I/O specs on page 21,22.