Siemens MICROMASTER 440 VFD 0.37kW 200-240V 1/3-Phase 6SE6440-2UC13-7AA1

Siemens MICROMASTER 440 VFD 0.37kW – Versatile Vector Drive for Demanding Applications

The Siemens MICROMASTER 440, model 6SE6440-2UC13-7AA1, delivers 0.37kW output power with 200-240V 1/3-phase input. This unfiltered drive occupies the same compact A-size chassis as the 0.12kW and 0.25kW models but offers higher power output, making it the most popular choice among the smaller MM440 variants for applications requiring both compact footprint and robust performance.

Key Specifications:
- Output Power: 0.37 kW (constant torque)
- Input Voltage: 200-240V AC 1/3-phase, +10/-10%, 47-63Hz
- Input Current: 2.7 A
- Rated Output Current: 1.6 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 industrial mixers and agitators
- Packaging machinery feeders
- Small conveyor systems
- Rotary table drives
- Small centrifugal pumps
- Industrial oven fan controls

Key Features:
- Sensorless vector control for superior dynamic response
- Linear V/f and Quadratic V/f modes
- Built-in PID controller for process regulation
- BiCo technology for flexible I/O mapping
- Integrated RS-485 Modbus RTU interface
- Built-in braking chopper
- Flying restart for spinning motor capture
- DC injection braking and compound braking
- 3 programmable relay outputs

Why 0.37kW Is a Popular Choice:
The 0.37kW power rating is the most common power level for small industrial equipment worldwide. This MM440 variant provides the perfect balance of power, control capability, and compact size. When replacing fixed-speed motors with VFD control, this 0.37kW drive typically achieves energy savings of 20-40% in centrifugal fan and pump applications, with payback periods often under 12 months.

Important Notes:
- This product is discontinued. Available ONLY as a spare part
- For new installations, Siemens recommends the SINAMICS G120 series
- An operator panel (BOP 6SE6400-0BP00-0AA1 or AOP 6SE6400-0AP00-0AA1) is required for parameter programming

FAQ:

Q1: Can the 0.37kW drive run a 0.25kW motor?
A: Yes, and it will operate with increased thermal margin and potential for future load increases. The drive's 0.37kW rating exceeds the motor's 0.25kW rating, allowing the drive to run cooler and extending its service life.

Q2: Does this model require an operator panel for basic operation?
A: No. The drive operates with factory default settings out of the box. However, an operator panel is required for any parameter changes, including motor data input, ramp times, or PID settings.

Q3: What communication protocols are supported?
A: Standard RS-485 Modbus RTU on terminals 14-15. RS-232 is also available. Optional PROFIBUS DP module (6SE6400-1PB00-0AA0) and DeviceNet module are available as accessories.

Q4: What is the recommended braking resistor for this model?
A: The built-in braking chopper supports external braking resistors. For occasional deceleration applications, minimum resistance 50-75 ohms with 100-200W power rating is typical. For frequent braking duty, consult Siemens documentation for specific resistor sizing based on application duty cycle.

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