Siemens MICROMASTER 440 VFD 15kW 200-240V 3-Phase 6SE6440-2UC31-5DA1

Siemens MICROMASTER 440 VFD 15kW – Maximum D-Size Vector Drive for 200V Systems

The Siemens MICROMASTER 440, model 6SE6440-2UC31-5DA1, delivers 15kW constant torque output power with 200-240V 3-phase input, with square-law torque rating extending to 18.5kW for pump and fan applications[reference:65]. This D-size unfiltered drive represents the maximum constant torque power available in the D-size chassis before transitioning to the larger E-size platform.

This model sits at the upper boundary of the D-size form factor, offering the highest power density achievable within the 520×275×245mm enclosure. Applications at this power level are typically continuous-duty industrial processes where downtime carries significant cost implications—the drive's robust vector control ensures consistent performance without interruption.

The advanced sensorless vector control maintains 100% torque down to 0.5 Hz without encoder feedback, a capability that distinguishes the MM440 from basic V/f drives even at these higher power levels. The built-in braking chopper enables dynamic braking when used with an appropriately sized external resistor, supporting controlled deceleration for high-inertia loads.

Key Specifications:
- Output Power: 15 kW (constant torque) / 20 HP
- Square-Law Torque Power: 18.5 kW (pumps, fans, centrifugal loads)[reference:66]
- Input Voltage: 200-240V AC 3-phase, +10/-10%, 47-63Hz[reference:67]
- Rated Output Current: Approx. 55 A (estimated based on power rating)
- Output Frequency: 0-650 Hz
- Overload Capacity: 150% for 60 s, 200% for 3 s[reference:68]
- Protection Class: IP20
- Operating Temperature: -10°C to +50°C
- Dimensions (H×W×D): 520mm × 275mm × 245mm[reference:69]
- Weight: 16 kg[reference:70]
- Filter: Without built-in filter
- Frame Size: D

Typical Applications:
- Large industrial process machinery
- High-capacity extruders and compounders
- Heavy-duty mixers and agitators
- Large centrifugal pumps for water/wastewater
- Industrial fans and blowers for ventilation systems
- Conveyor systems for heavy bulk materials
- Machine tool main drives

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
- Integrated Modbus RTU interface (RS-232 and RS-485)
- PID controller for closed-loop process control
- 6 digital inputs, 2 analog inputs, 2 analog outputs, 3 relay outputs
- Flying restart for capturing spinning motors
- DC injection braking for zero-speed holding
- 4 skip frequencies for resonance avoidance
- Adjustable PWM frequency

Application Case: Industrial Extruder Control
In plastics or rubber extrusion applications, consistent throughput is critical for product quality. The 15kW MM440 with sensorless vector control maintains stable motor speed regardless of material viscosity variations caused by temperature fluctuations or batch differences. The built-in PID can regulate screw speed based on melt pressure feedback, while the 150% overload capacity handles momentary surges from blockages or cold starts.

Important Notes:
- This product is discontinued (PM410). Available ONLY as a spare part
- Requires 3-phase input only; verify supply capacity for 55A+ current draw
- For new installations, SINAMICS G120 series is the recommended successor
- External braking resistor may be required for dynamic braking applications
- BOP or AOP required for parameter changes beyond factory defaults

FAQ:

Q1: What is the typical input current for this 15kW model?
A: At full load, input current is approximately 55A for constant torque operation. Verify that your supply and protection devices are rated for continuous operation at this level. For square-law torque applications (18.5kW), input current will be proportionally higher.

Q2: Why choose the D-size 15kW model over moving to E-size?
A: The D-size chassis (520mm height) is more compact than E-size (650mm height). If 15kW meets your power requirement, the D-size model offers smaller cabinet footprint and lower cost. The E-size platform is designed for higher power ranges (18.5kW-30kW) and should be selected only if your load exceeds 15kW constant torque capacity.

Q3: What protection devices are recommended?
A: Refer to local electrical codes. A circuit breaker or fuses sized for the drive's input current rating is required. Semiconductor fuses (type aR) provide the best protection for the drive's input rectifier.

Q4: Can this drive be used for positioning applications?
A: With sensorless vector control, this drive can perform basic positioning tasks without encoder feedback. For high-precision positioning requiring encoder feedback, consider adding an encoder module or evaluating the SINAMICS G120 series with appropriate options.

📦 Spare Part – Limited Stock | Tech Support | Please confirm availability before ordering
Contact us for pricing and availability.

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