4–51

L200 Inverter

Analog Input Operation

The L200 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“Analog Input Current/Voltage Select” on page 4–23. Remember that you must also set A001 = 01 to select analog input as the frequency source.

AM H O OI L

+V Ref.

Voltage input

Current input

A GND

V/I input

 

 

A001

 

select

 

 

 

 

Freq.

 

 

 

 

[AT]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

setting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AM H O OI L

4-20 mA, AT=ON

+ –

 

0-10 V, AT=OFF

 

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 common

 

 

 

 

 

 

 

 

 

 

 

AM

H

O

OI

L

way to control the inverter output frequency

 

 

 

 

 

 

 

 

 

 

 

(and a good way to learn how to use the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

analog inputs). The potentiometer uses the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

built-in 10V reference [H] and the analog

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ground [L] for excitation, and the voltage

 

 

 

 

 

 

 

 

 

 

1 to 2k

Ω

 

 

, 2W

input [O] for the 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 uses

 

 

 

 

 

 

 

 

 

 

 

 

 

AM

H

O

OI

L

 

terminals [L] and [O]. Attach the signal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

cable’s 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

 

 

 

 

 

 

 

 

 

 

 

 

 

AM

H

O

OI

L

 

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

 

 

comes from a sourcing type transmitter; a

4 to 19.6 mA DC,

 

 

 

 

 

 

 

 

 

sinking type will not work! This means the

 

 

 

 

 

 

 

 

 

4 to 20 mA nominal

 

 

 

 

 

 

 

 

 

current must flow into terminal [OI], and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

terminal [L] is the return back to the transmit-

See I/O specs on page 4–6.

 

 

 

 

 

 

 

 

 

ter. The input impedance from [OI] to [L] is

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

Operations Monitoring and