Analog Input Current/Voltage Select - Hitachi L200 Series Instruction Manual

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 A001 = 01 to enable the analog terminal set for control-
ling the inverter frequency.
Option Terminal
Code Symbol
16 AT Analog Input
Voltage/current
Select
C001, C002, C003, C004,
Valid for inputs:
C005
A001 = 01
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 A001=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
A001=01 to select the analog input terminals.
Input
Function Name
State
ON
OFF
L200 Inverter
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 models require input
configuration—see page 3–42):
AT
L 5 4 3
AM H O OI L
+ –
See I/O specs on page 4–6.
4–23
2 1 PCS
4-20 mA, AT=ON
0-10 V, AT=OFF