43
Analog Input Operation
The WL200 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
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
, 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.
setting
V/I input
select
[AT]
+ -
4-20 mA
0-10 V
AM H O OI L
1 to 2k
, 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 23, 24.
