Hitachi SJ100 Analog Input Current/Voltage Select

4–20

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, C_06

for –FU models; –FE and –FR models require

Required settings:

A_01 = 01

input configuration—see page 3–34):

Notes:

AT

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

L

6

5

4

3

2

1

P24

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.	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.