OMRON 3G3MX2 frequency converter

Product specifications and scope of application

Model system

200V single-phase: 3G3MX2-ABxx (0.1~2.2kW)

200V three-phase: 3G3MX2-A2xx (0.1-15kW)

400V three-phase: 3G3MX2-A4xx (0.4-15kW)

Core electrical parameters

Project parameters

Output frequency 0.1~400Hz

Starting torque 200% @ 0.5Hz (no sensing vector)

Overload capacity CT: 150%/60s; VT：120%/60s

Carrier frequency 2-15kHz

Control mode V/F, sensorless vector, free V/F

Communication interface RS485 Modbus RTU (standard)

Safety function STO (ISO 13849-1 PLd)

Safety regulations (mandatory requirement)

High voltage hazard: Wait for 10 minutes after power failure before operation, ensure that the CHARGE light is off

Installation requirements: It must be installed on flame-retardant steel plates and vertical vibration free walls

Grounding specifications: 200V level ≤ 100 Ω, 400V level ≤ 10 Ω, single point grounding

Prohibited items: Do not connect the power supply to the output terminal U/V/W; Prohibit connecting capacitors on the output side

Personnel requirements: Only professional electrical personnel are allowed to install and debug

Installation and heat dissipation

Installation direction: Vertical installation to ensure unobstructed heat dissipation ducts

Distance requirement: Up, down, left, right * * ≥ 100mm**

Heat dissipation conditions: ambient temperature * * -10~50 ℃ * *, humidity 20~90% RH

IP54 model: equipped with dust and water resistance, EMC filter, suitable for harsh environments

Wiring specifications

1. Main circuit wiring

Terminal function

R/L1, S/L2, T/L3 three-phase power input

L. N single-phase power input

U/T1, V/T2, W/T3 motor outputs

+1. P/+2 DC reactor/braking unit

RB braking resistor

FG grounding

2. Wiring specifications

Wire diameter: AWG16~AWG2 (matched by power)

Screw torque: M3.5 (1.0N · m)~M8 (8.8N · m)

Fuse: Class J, 10A~80A (matched by model)

3. Control circuit

Intelligent input: 7 channels, customizable functions (forward rotation, reverse rotation, multi-stage speed, etc.)

Intelligent output: 3 channels, relay/open collector

Analog quantity: 0~10V/4~20mA input, 0~10V output

USB：mini-B， Used for PC debugging

RJ45: Remote Operator Interface

Parameter system (core grouping)

D group (monitoring): output frequency, current, temperature, fault history, life monitoring

F group (main parameters): target frequency, acceleration and deceleration time, operating direction

Group A (standard function): frequency command source, operation command source, highest frequency, base frequency

Group B (Fine tuning): Carrier frequency, torque boost, electronic thermal relay, protection threshold

Group C (Smart Terminal): Input/Output Function Allocation

H group (motor parameters): motor pole number, rated current, self-tuning

Core functions

Speed control

16 preset speeds, binary/bit control modes

Acceleration and deceleration: linear, S-curve, U-curve, inverse U-curve, EL-S curve

PID control

Closed loop feedback, supporting temperature/pressure/flow closed-loop

Sleep function, PID reverse output, feedforward control

torque control

Torque limitation and torque bias under sensorless vector

safety function

STO safety torque shutdown, reaching PLd/Cat. 3

protection function

Overcurrent, overvoltage, undervoltage, overload, brake resistor overload, ground fault, overheating

Debugging and operation

keyboard operation

RUN/STOP/RESET: Run, Stop, Reset

PRG: Parameter Switching; ▲/▼: Numerical adjustment; SET: Confirm

Power on testing steps

Confirm wiring → Set command source=keyboard → Set motor parameters → Test run → Check steering direction

Parameter initialization: restore factory settings to avoid parameter confusion

Fault diagnosis and maintenance

Fault monitoring: D081~D086 record the last 6 faults (code, frequency, current, voltage)

Common Faults

E01: Overcurrent; E02: Overvoltage; E05: Overload; E06: Overload of braking resistor

Maintenance points

Cooling fin cleaning, fan inspection, capacitor life monitoring

Check the wiring torque every year and replace vulnerable parts every 3-5 years

Key issues

Question 1: What is the difference between the two overload levels CT/VT of MX2 frequency converter, and what scenarios are they applicable to?

Answer: CT (constant torque/heavy load): 150%/60s overload, suitable for equipment such as conveyors, cranes, elevators, etc. that require high starting torque; VT (Variable Torque/Light Load): 120%/60s overload, suitable for variable torque loads such as fans and pumps, with higher rated current at the same power.

Question 2: How to quickly set the MX2 inverter to “keyboard controlled start stop+keyboard set frequency” through the keyboard?

Answer: 1 Set A001=02 (frequency command=keyboard); 2. Set A002=02 (run command=keyboard); 3. Set A003 (base frequency), A004 (highest frequency), H004 (number of motor poles); 4. Press RUN to start, ▲/▼ adjust the frequency, and STOP to stop.

Question 3: What must be done when the output line of the MX2 inverter motor exceeds 10 meters? Why?

Answer: An output reactor/surge filter must be installed (mandatory requirement for 400V level). Because the PWM waveform can generate surge voltage on the long line, it may break through the motor insulation, causing damage to the motor and reducing interference.