Siemens MICROMASTER 440 VFD 22kW 200-240V 3-Phase 6SE6440-2UC32-2EA1

Siemens MICROMASTER 440 VFD 22kW – E-Size High-Power Vector Drive for Heavy Industry

The Siemens MICROMASTER 440, model 6SE6440-2UC32-2EA1, delivers 22kW constant torque output power with 200-240V 3-phase input, with square-law torque rating extending to 30kW for pump and fan applications[reference:78]. This E-size unfiltered drive is designed for heavy industrial applications where high power output and reliable vector control are required for continuous operation.

At 22kW constant torque, the output current reaches 80A[reference:79], placing this drive firmly in the category of heavy industrial equipment. Applications at this power level typically involve large machinery with significant inertia: industrial fans with large-diameter impellers, centrifugal pumps handling high flow rates, and process machinery requiring consistent torque delivery under varying loads.

The E-size chassis provides the thermal capacity necessary for 24/7 operation at these power levels. The drive's sensorless vector control ensures stable performance even when load conditions vary—critical for applications like sludge pumps in wastewater treatment where solids content changes, or fans in variable air volume systems where static pressure fluctuates based on duct demand.

Key Specifications:
- Output Power: 22 kW (constant torque) / 30 HP
- Square-Law Torque Power: 30 kW (pumps, fans, centrifugal loads)[reference:80]
- Input Voltage: 200-240V AC 3-phase, +10/-10%, 47-63Hz[reference:81]
- Input Current: 71 A (constant torque)[reference:82]
- Rated Output Current: 80 A (constant torque)[reference:83]
- Output Frequency: 0-600 Hz[reference:84]
- Overload Capacity: 150% for 60 s, 200% for 3 s[reference:85]
- Protection Class: IP20
- Operating Temperature: -10°C to +50°C
- Dimensions (H×W×D): 650mm × 275mm × 245mm[reference:86]
- Weight: Approx. 28-35 kg
- Filter: Without built-in filter
- Frame Size: E

Typical Applications:
- Large centrifugal pumps for water/wastewater
- High-capacity industrial fans and blowers
- Heavy-duty conveyors for bulk materials
- Large extruders and mixing equipment
- Centrifuges and separators
- Screw compressors
- Industrial washers and dryers

Key Features:
- Sensorless vector control delivers 100% torque down to 0.5 Hz without encoder
- Built-in braking chopper for dynamic braking (external resistor required)
- BiCo technology for flexible I/O signal configuration
- 6 digital inputs, 2 analog inputs, 2 analog outputs, 3 relay outputs
- Integrated Modbus RTU interface
- Flying restart for capturing spinning motors
- DC injection braking for zero-speed holding
- PID controller for closed-loop process control
- 4 skip frequencies for resonance avoidance
- Comprehensive protection functions for reliable operation

Application Case: Wastewater Treatment Pump Control
In a typical wastewater treatment facility, pumps handling variable influent flow rates benefit significantly from VFD control. A 22kW MM440 controlling a centrifugal pump can maintain constant discharge pressure regardless of flow demand, prevent dry-running conditions with built-in detection logic, and reduce energy consumption by 20-40% compared to fixed-speed operation with control valves.

Important Notes:
- This product is discontinued (PM410). Available ONLY as a spare part
- Requires 3-phase input only; 80A output requires substantial supply capacity
- For new installations, SINAMICS G120 series is the recommended successor
- External braking resistor may be required for dynamic braking
- BOP or AOP required for parameter changes beyond factory defaults

FAQ:

Q1: What are the installation space requirements for this E-size drive?
A: The physical dimensions are 650×275×245mm (height×width×depth). Allow 100mm clearance above and below for proper airflow. For side-by-side mounting, no horizontal clearance is required, but adequate overall cabinet ventilation is essential at this power level.

Q2: Can this 22kW drive handle a 30kW motor in pump applications?
A: Yes, for centrifugal pump applications. The square-law torque rating of 30kW applies because pump torque increases with the square of speed (power increases with the cube of speed). At full speed, a 30kW pump draws 30kW, so this drive would be undersized for continuous 30kW operation. Consult the pump curve and verify that your operating point does not exceed the drive's current rating.

Q3: What communication options are available?
A: Standard RS-485 Modbus RTU is built-in. Optional PROFIBUS DP module (6SE6400-1PB00-0AA0) and DeviceNet module are available as accessories for integration into industrial automation networks.

Q4: What cooling requirements does this drive have?
A: Natural air convection cooling is the primary method. For cabinet installation, forced ventilation is recommended if multiple drives are mounted or if ambient temperatures approach the 50°C limit. Cabinet internal temperature should be maintained below the drive's maximum ambient rating.

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