H O OI L FM CM2 12 11
4 to 19.6 mA DC,
4 to 20 mA nominal
See I/O specs on page 4–6.

4–29

L100 Inverter

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 “Analog Input Current/Voltage Select” on page 4–18. Remember that you must also set A_01 = 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

 

 

A 01

 

select

 

 

 

 

Frequency

 

 

 

 

[AT]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

setting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H O OI L FM CM2 12 11

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

H

O

OI

L

FM

CM2

12

11

 

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

comes from a sourcing type transmitter; a sinking type will not work! This means the current must flow into terminal [OI], and terminal [L] is the return back to the transmit-

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