Siemens MICROMASTER 440 VFD 0.25kW 200-240V 1/3-Phase 6SE6440-2UC12-5AA1

Siemens MICROMASTER 440 VFD 0.25kW – Compact Vector Drive for Precision Motion Control

The Siemens MICROMASTER 440, model 6SE6440-2UC12-5AA1, delivers 0.25kW output power with 200-240V 1/3-phase input. This unfiltered compact drive is part of the MICROMASTER 440 series, featuring advanced vector control technology and a built-in braking chopper for dynamic response. The MM440 series is ideal for applications where load conditions vary and high starting torque is required.

Key Specifications:
- Output Power: 0.25 kW (constant torque)
- Input Voltage: 200-240V AC 1/3-phase, +10/-10%, 47-63Hz
- Input Current: Approx. 1.8 A
- Rated Output Current: 1.3 A
- Output Frequency: 0-650 Hz
- Overload Capacity: 150% for 60s, 200% for 3s
- Protection Class: IP20
- Operating Temperature: -10°C to +50°C
- Dimensions (H×W×D): 173mm × 73mm × 149mm
- Weight: Approx. 1.3 kg
- Filter: Without built-in filter
- Frame Size: A

Typical Applications:
- Small automated assembly equipment
- Laboratory roller drives
- Small pump and fan controls
- Conveyor systems for light loads
- Small extruder drives
- Precision winding machinery

Key Features:
- Sensorless vector control
- Linear and quadratic V/f control with FCC (Flux Current Control)
- Built-in PID controller
- BiCo technology for flexible I/O configuration
- Integrated RS-485 Modbus RTU interface
- Built-in braking chopper (external resistor ready)
- Flying restart function
- DC injection braking
- Adjustable pulse frequency: 2-16 kHz

Performance Advantages:
The 0.25kW MM440 drive delivers consistent performance across varying load conditions. The advanced vector control algorithm adjusts the voltage and frequency output in real time based on motor feedback, ensuring stable torque production even at low speeds. In a typical small mixer application, the drive maintains output torque during ingredient addition without stalling.

Important Notes:
- This product is discontinued. Available ONLY as a spare part
- For new designs, Siemens recommends the SINAMICS G120 series as the successor
- An operator panel (BOP or AOP) is required for parameter changes beyond factory defaults

FAQ:

Q1: Can this drive provide full torque at zero speed?
A: Yes. With sensorless vector control, the MM440 can deliver up to 100% rated torque down to 0 Hz, making it suitable for applications requiring holding torque at standstill.

Q2: What control methods are available?
A: The MM440 supports Linear V/f, Quadratic V/f (for pump/fan applications), Sensorless Vector Control, and Flux Current Control (FCC). This allows optimization for different load types including constant torque and variable torque applications.

Q3: Is this drive suitable for hoist applications?
A: While the MM440 includes a built-in braking chopper, for hoist applications requiring frequent starting/stopping and holding torque, additional safety components may be required. Consult local safety regulations for hoist applications.

Q4: Does this model include an EMC filter?
A: No. This is the unfiltered version. External EMC filters are available as accessories for installations requiring compliance with EN55011 Class A or B emission standards.

📦 Spare Part – Limited Stock | Tech Support | Please confirm availability before ordering
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