Menu

Omron 3G3MX2-A4055-V2 5.5 kW 400 V VFD - front view showing the 7-segment LED display, the rotary RUN/STOP/parameter-select knob, the STO safety input terminals, and the 7 digital inputs + 2 digital outputs + 2 analog inputs + 1 analog output terminal block

Omron 3G3MX2-A4055-V2 — Drive

SKU: 3G3MX2-A4055-V2

USD 290.00

MX2-series 5.5 kW (ND) / 7.5 kW (LD) 400 V 3-phase variable frequency drive with V2 firmware (PM motor sensorless vector, expanded Modbus, improved autotune). 14.5 A ND / 19.1 A LD output, 0.1-590 Hz, built-in EMC filter, STO SIL3, Modbus RTU, PID, optional EtherCAT.

1-Year Warranty Full manufacturer warranty
Global Shipping Worldwide delivery available
Genuine Omron 100% authentic product
Ready to Ship Usually ships within 24h
In Stock

This item is available for immediate shipment from our warehouse.

Request Quote

Contact for pricing, bulk discounts, and shipping

Product Overview

The 3G3MX2-A4055-V2 is Omron's 5.5 kW (Normal Duty) / 7.5 kW (Light Duty) 400 V 3-phase variable frequency drive with V2 firmware — the middle-power sibling in the MX2-series 400 V lineup, between the A4040-V2 (already done, 4 kW) and the A4075-V2 (already done, 7.5 kW). The 5.5 kW ND / 7.5 kW LD dual rating allows the VFD to drive both a normal-duty load (150% overload for 60 s, e.g., conveyors, mixers, fans) and a light-duty load (120% overload for 60 s, e.g., centrifugal pumps, HVAC fans) without derating.

Decoding 3G3MX2-A4055-V2 within the MX2 family

The 3G3MX2-@@@@@@@ model code has multiple positional segments that encode input voltage, power rating, and firmware generation. The 'A' = 3-phase 400 V input (vs 'AB' = single-phase 200 V, 'A2' = 3-phase 200 V, 'C' = single-phase 100 V). The '4055' = 5.5 kW Normal Duty / 7.5 kW Light Duty rated power (vs '4004' = 0.4 kW, '4007' = 0.75 kW, '4015' = 1.5 kW, '4022' = 2.2 kW, '4030' = 3.0 kW, '4040' = 4.0 kW, '4075' = 7.5 kW, '4110' = 11 kW, '4150' = 15 kW).

Built-in V2 firmware features — sensorless vector for PM motors

The V2 firmware generation (vs the older V1) adds several capabilities important for modern motor control: (a) PM motor sensorless vector control — the VFD can control permanent-magnet (PM) synchronous motors without an encoder, using the motor's back-EMF to estimate rotor position. This is critical for high-efficiency applications (HVAC fans with PM motors, servo pump drives, hybrid vehicle test rigs) where the older V1 firmware could only control PM motors in V/f open-loop mode.

Built-in safety — STO SIL3, no external safety relay needed

The 3G3MX2-A4055-V2 includes STO (Safe Torque Off) SIL3 per IEC 61800-5-2 and PLe per ISO 13849-1 as a built-in function. The STO is wired via two dedicated safety input terminals (typically labeled 'S+' and 'S-' or 'STO1' and 'STO2'); when both inputs are energized, the drive operates normally; when either input is de-energized (e.g., by an E-stop contact opening), the drive removes torque from the motor within 5 ms (the safe state). This is the highest level of drive-integrated safety — equivalent to a hardwired contactor-based E-stop, but without the contactor cost or the contactor coil current.

Key Features

  • MX2-series 5.5 kW / 7.5 kW three-phase 400 V variable frequency drive
  • V2 firmware generation
  • ND rating: 5.5 kW / 14.5 A continuous output, 150% overload for 60 s
  • LD rating: 7.5 kW / 19.1 A continuous output, 120% overload for 60 s
  • Control methods: V/f, Sensorless vector, Closed-loop vector
  • PM motor support: Yes
  • Built-in Modbus RTU via RS-485
  • Built-in EMC filter
  • SKU: 3G3MX2-A4055-V2
  • Series: 3G3MX2 V2 Multi-Function Compact VFD
  • Voltage: 380-480 VAC
  • I/O: 3 I/O

Best-Fit Applications

  • Water-treatment pump skid - 5.5 kW 3-phase centrifugal pump with PID loop on the VFD's analog input, the VFD auto-adjusts.
  • HVAC supply / return fan control - 5.5 kW 3-phase fan with PID loop on the duct static-pressure sensor, the.
  • Conveyor speed control in a packaging line - 5.5 kW 3-phase conveyor motor with master speed reference from the PLC's.
  • Plastic extruder screw drive - 5.5 kW 3-phase extruder motor with torque-controlled sensorless vector, the VFD maintains constant torque at.

Buying Checklist

  • Pick 3G3MX2-A4055-V2 for 5.5 kW 400 V 3-phase VFD with V2 firmware - middle-power motor control
  • Pick 3G3MX2-A4040-V2 for 4.0 kW 400 V 3-phase VFD - smaller motor loads
  • Pick 3G3MX2-A4075-V2 for 7.5 kW 400 V 3-phase VFD - larger motor loads
  • Pick 3G3MX2-A4110-V2 for 11 kW 400 V 3-phase VFD - industrial motors
  • Pick 3G3MX2-A4007-V2 for 0.75 kW 400 V 3-phase VFD - small motor loads
  • Pick 3G3MX2-AB007-V2 for 0.75 kW 200 V single-phase VFD - single-phase input applications

Technical Specifications

Model 3G3MX2-A4055-V2
Series 3G3MX2 V2 Multi-Function Compact VFD
Type 5.5 kW (ND) / 7.5 kW (LD) three-phase 400 V variable frequency drive, V2 firmware
Input Voltage 3-phase 380-480 VAC +/-10% (50/60 Hz)
Input Phase 3-phase
Output Voltage 3-phase 0 to input voltage (variable frequency)
Output Frequency Range 0.1 to 590 Hz
Normal Duty (ND) Rating 5.5 kW / 14.5 A continuous, 150% overload for 60 s
Built-in Communications Modbus RTU via RS-485 (RJ45 port)
Optional Communications Cards 3G3AX-MX2-ECT (EtherCAT), 3G3AX-MX2-DRT (DeviceNet), 3G3AX-MX2-PRT (PROFIBUS), 3G3AX-MX2-CMP (CompoNet)
Digital Inputs 7 programmable (multi-function: start, stop, reverse, jog, multi-speed, etc.)
Digital Outputs 2 programmable (1 relay SPDT 2 A, 1 open-collector 50 mA)
Analog Inputs 2 (0-10 V / 4-20 mA selectable, plus -10 to +10 V for direction/bias)
Analog Output 1 (0-10 V or 4-20 mA for motor frequency, current, output voltage, etc.)
Pulse Train Input Yes (0 to 32 kHz; for follower / master-slave operation)

FAQ for 3G3MX2-A4055-V2

What's the difference between 3G3MX2-A4055-V2 and 3G3MX2-A4055-V1?
Both are 5.5 kW 400 V 3-phase VFDs in the MX2 family. The difference is the firmware generation: V1 (older, ~2014-2019) supports V/f and sensorless vector for induction motors only; V2 (newer, ~2020+) adds sensorless vector for PM (permanent-magnet) motors, expanded Modbus register map, faster CPU processing, more accurate autotune, and improved braking algorithm. For new installations, V2 is the right pick unless you have a specific need for V1 (e.g., to match existing V1 fleet for spares compatibility).
What's the difference between V2 and EV2 firmware on the 3G3MX2 VFD?
V2 and EV2 are both firmware generations for the 3G3MX2 VFD, with EV2 being the newest (introduced 2024). The key differences: (a) EtherCAT support - EV2 supports the 3G3AX-MX2-ECT EtherCAT option card, V2 does not. EtherCAT integration is critical for NJ-series machine controllers (NJ501-1400 etc.) and high-speed multi-drive systems. (b) Smart Active Parts - EV2 supports Omron's Smart Active Parts library for HMI integration (NB/NS series HMIs), V2 does not.
Can the 3G3MX2-A4055-V2 do closed-loop vector control with an encoder?
Yes - the 3G3MX2-A4055-V2 supports closed-loop vector control with an optional encoder feedback card. The encoder card is the 3G3AX-PG01 (line-driver differential encoder input) or 3G3AX-PG02 (open-collector encoder input). The card plugs into the option slot on the bottom of the VFD.
What is the STO (Safe Torque Off) function on the 3G3MX2-A4055-V2?
The 3G3MX2-A4055-V2 includes STO (Safe Torque Off) SIL3 per IEC 61800-5-2 and PLe per ISO 13849-1 as a built-in function. The STO is wired via two dedicated safety input terminals on the VFD's control board. When both inputs are energized (24 VDC applied to both), the VFD operates normally. When either input is de-energized (e.g., by an E-stop contact opening), the VFD removes torque from the motor within 5 ms - the safe state.

Similar Products

Explore related Omron models often viewed alongside this product.