Hitachi CONVENTION 14 Welding System User Manual


 
Analog Input Operation
The X200 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” on
page 4–22. Remember that you must also set
A001 = 01 to select analog input as the
frequency source.
N
OTE: If no logic input terminal is configured for the [AT] function, then inverter
recognizes that [AT]=OFF.
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.
V
oltage 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).
C
urrent 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 250 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]
Å
+
-
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
Å
See I/O specs on page 4-6.
455
Inverter Mounting
and installation
4 55
Operations and
Monitoring