4–18

Using Intelligent Input Terminals

Analog Input Current/Voltage Select

Operations and Monitoring

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 controlling the inverter frequency.

Option

Terminal

Function Name

Input

Description

Code

Symbol

State

 

 

 

 

 

 

 

 

 

 

 

 

16

AT

Analog Input

ON

Terminal OI is enabled for current input (uses

 

 

Voltage/current

 

terminal L for power supply return)

 

 

Select

 

 

 

 

OFF

Terminal O is enabled for voltage input (uses

 

 

 

 

 

 

 

terminal L for power supply return)

 

 

 

 

 

 

 

 

 

 

Valid for inputs:

C_01, C_02, C_03, C_04,

Example (default input configuration shown

C_05

 

 

 

 

for –FU models; –FE and –FR models

Required settings:

A_01 = 01

 

require input configuration—

 

see page 3–32):

 

 

 

 

 

 

 

 

Notes:

• If the [AT] option is not assigned to any intelligent

 

 

 

 

 

 

 

 

 

AT

input terminal, then inverter uses the algebraic sum

 

 

 

 

 

 

 

 

 

of both the voltage and current inputs for the

 

 

L

 

5

4

3

2

1

P24

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.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

O

OI

 

L

FM

CM2

12

11

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4-20 mA when AT= ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+ –

 

 

 

 

 

0-10 V when AT= OFF

 

 

 

 

 

 

 

 

 

See I/O specs on page 4–6.