Omron 3G3RX2-A2 Series User Manual

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Control circuit

■RS485 Communication Terminal

SP and SN terminals with the same names are internally connected respectively, so they can be used

for wiring multiple terminals.

Terminal

symbol

Terminal

name

Description

Electrical character-

istics

RS485 com-

munication

Serial

communi-

cation

(CM1)

RS-485

terminal

for Modbus

communi-

cation

SP terminal: RS-485 differential (+) signal

SN terminal: RS-485 differential (-) signal

RP terminal: Connect to SP via tile terminating

resistor

CM1 terminal: Connect with the signal ground

of an external communication device.

(also used by FM terminal)

There are two SP terminals and SN terminals

each, which are connected internally.

Maximum baud rate is 115.2kbps.

Equipped with termi-

nating resistor

(120Ω)

Enable: Short RP-SN

Disable: Open RP-SN

(+) (-)

Control circuit terminal area

Modbus communication

RPSNSPSNSPCM1

Connect CM1 to the SG

(signal ground) of an

external device.

When enabling the terminating

resistor, short RP-SN.

Questions and Answers:

S
Steven GilbertAug 22, 2025
Why does my Omron Inverter show error E044?
- H
  Heather WeberAug 22, 2025
  The E044 error on your Omron Inverter indicates that a subroutine, 'for next' command, or 'if' command is nested over eight levels. To resolve this, correct the program to ensure that the number of nesting levels is eight or less.
T
turnermarkSep 1, 2025
How to fix error E043 on an Omron 3G3RX2-A2?
- M
  Meghan FisherSep 1, 2025
  The E043 error on your Omron Inverter means that the terminal PRG was turned ON even though no program was downloaded into the inverter. To fix this, you should create the program again and then download it to the inverter.

Omron 3G3RX2-A2 Series Specifications

General

Category	Inverter
Frequency Control Range	0.1 to 400 Hz
Enclosure Rating	IP20
Series	3G3RX2-A2
Output Frequency	0 to 400 Hz
Current Range	3.5 A
Control Method	V/f control, Sensorless vector control
Overload Capacity	150% for 60 seconds
Protection Functions	Overcurrent, Overvoltage, Undervoltage, Ground fault
Communication	RS-485 (Modbus ASCII/RTU)
Operating Temperature	-10°C to +50°C (14°F to 122°F)
Storage Temperature	-20 to +60°C (-4 to 140°F)
Cooling Method	Fan Cooled