Hitachi L100 Series Instruction Manual page 129

4–18
Using Intelligent Input Terminals
Analog Input Current/Voltage Select
The [AT] terminal selects whether the inverter uses the voltage [O] or current [OI] input
terminals for external frequency control. When intelligent input [AT] is ON, you can set
the output frequency by applying a current input signal at [OI]-[L]. When the [AT] input
is OFF, you can apply a voltage input signal at [O]-[L] to set the output frequency. Note
that you must also set parameter A_01 = 01 to enable the analog terminal set for control-
ling the inverter frequency.
Option Terminal
Code Symbol
16 AT
Valid for inputs:
Required settings:
Notes:
•
If the [AT] option is not assigned to any intelligent
input terminal, then inverter uses the algebraic sum
of both the voltage and current inputs for the
frequency command (and A_01=01).
•
When using either the analog current and voltage
input terminal, make sure that the [AT] function is
allocated to an intelligent input terminal.
•
Be sure to set the frequency source setting
A_01=01 to select the analog input terminals.
Input
Function Name
State
Analog Input ON
Voltage/current
Select
OFF
C_01, C_02, C_03, C_04,
C_05
A_01 = 01
Description
Terminal OI is enabled for current input (uses
terminal L for power supply return)
Terminal O is enabled for voltage input (uses
terminal L for power supply return)
Example (default input configuration shown
for –FU models; –FE and –FR models
require input configuration—
see page 3–32):
L 5 4
H O OI L FM CM2
4-20 mA when AT= ON
0-10 V when AT= OFF
+ –
See I/O specs on page 4–6.
AT
3 2 1 P24
12 11