4–24

Analog Input Operation

Analog Input Operation

The L100 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. If terminal [AT] is Off, the voltage input

[O]can command the inverter output frequency. If terminal [AT] is On, the current input [OI] can command the inverter output frequency. The [AT] terminal function is covered in the logic input section on page 4–15. Remember that you must also set A01 = 01 to select analog input as the frequency source.

H O OI L FM CM2 12 11

+V Ref.

Voltage input

Current input

A GND

V/I input

A01

 

 

 

select

 

 

 

Frequency

 

 

 

[AT]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

setting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H O OI L FM CM2 12 11

4-20 mA, AT= On

+ –

0-10 V, AT= Off

 

Operations and Monitoring

NOTE: If no logic input terminal is configured for the [AT] function, then inverter sums the voltage and current input to determine the desired input value.

Using an external potentiometer is a popular

 

H

 

O

OI

L

FM

CM2

12

11

way to control the inverter output frequency

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(and a good way to learn how to use the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

analog inputs). The potentiometer uses the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10V reference [H] and the analog ground [L]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

for excitation, and the voltage input for the

1 to 2 k Ohms, 2 Watts

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 to 2 k Ohms, 2 Watts.

Voltage Input – The voltage input circuit

 

 

H O OI L

FM CM2 12 11

uses terminals [L] and [O]. Attach the cable

 

 

shield wire only to terminal [L] on the

 

 

 

 

 

 

 

 

 

 

 

0 to 9.6 VDC,

 

 

 

 

 

 

 

 

 

 

 

 

inverter. Maintain the voltage within specifi-

 

 

 

 

 

 

 

 

 

 

 

0 to 10V nominal

cations (do not apply negative voltage).

 

 

 

 

+ –

 

 

 

 

 

 

 

 

 

 

 

Current Input – The current input circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

O

OI

L

FM

CM2

12

11

 

uses terminals [OI] and [L]. The current come

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

from a sourcing type transmitter; a sinking

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

type will not work! This means the current

 

 

 

 

 

 

 

 

 

 

 

4 to 19.6 mA DC,

must flow into terminal [OI], and terminal [L]

 

 

 

 

 

 

 

 

 

 

 

4 to 20 mA nominal

 

 

 

 

 

 

 

 

 

is the return back to the transmitter. The input

See I/O specs on page 4–5.

impedance from [OI] to [L] is 250 Ohms.

 

Attach the cable shield wire only to terminal [L] on the inverter.

Page 115
Image 115
Hitachi L100 instruction manual Analog Input Operation

L100 specifications

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