Siemens MICROMASTER 440 VFD 45kW 200-240V 3-Phase 6SE6440-2UC34-5FA1

Siemens MICROMASTER 440 VFD 45kW – Maximum Power in MM440 200V Series

The Siemens MICROMASTER 440, model 6SE6440-2UC34-5FA1, delivers 45kW constant torque output power with 200-240V 3-phase input, with square-law torque rating extending to 55kW for pump and fan applications[reference:105]. This F-size unfiltered drive represents the highest power rating available in the entire MICROMASTER 440 200V product line, marking the top end of the series for applications requiring maximum output within the 200V input class.

At 45kW constant torque, output current reaches 154A[reference:106], representing the maximum capability of the MM440 200V series. For square-law torque applications like large centrifugal pumps and fans, the drive can handle motors up to 55kW[reference:107], providing substantial energy savings compared to fixed-speed operation or mechanical throttling.

The 200V input class has particular relevance for installations in North America (208V/240V common), parts of Asia, and other regions where 400V is less common. In these areas, this 45kW model offers the highest power density available within the MM440 family, eliminating the need for step-up transformers that would otherwise be required for higher voltage drives.

Key Specifications:
- Output Power: 45 kW (constant torque) / 60 HP
- Square-Law Torque Power: 55 kW (pumps, fans, centrifugal loads)[reference:108]
- Input Voltage: 200-240V AC 3-phase, +10/-10%, 47-63Hz[reference:109]
- Input Current: 135 A (constant torque)[reference:110]
- Rated Output Current: 154 A (constant torque)[reference:111]
- Output Frequency: 0-600 Hz
- Overload Capacity: 150% for 60 s, 200% for 3 s[reference:112]
- Protection Class: IP20
- Operating Temperature: -10°C to +50°C
- Dimensions (H×W×D): 850mm × 350mm × 320mm[reference:113]
- Weight: Approx. 60-70 kg
- Filter: Without built-in filter
- Frame Size: F

Typical Applications:
- Largest industrial pumps in the 200V class
- High-capacity fans and blowers
- Heavy industrial processing equipment
- Large extruders and compounding lines
- Major HVAC central plant equipment
- Large compressor installations
- Material handling systems for bulk materials

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
- Comprehensive protection functions for reliable operation

45kW – Maximum Output in MM440 200V Series:
This 45kW constant torque model represents the pinnacle of the MM440 200V product line. For applications requiring higher power at 200V input, no larger MICROMASTER 440 exists. This model was typically selected for the most demanding applications within the 200V class, including primary pumps, large fans, and heavy processing equipment. For installations with 380-480V available, higher power options up to 250kW exist within the MM440 400V product line.

Important Notes:
- This product is discontinued (PM410). Available ONLY as a spare part
- Requires 3-phase input only; 154A output at full load is a substantial electrical demand
- For new installations, SINAMICS G120 series is the recommended successor
- Heavy-gauge power cables required for 154A+ current (consult local electrical code)
- Forced cooling is required; natural convection insufficient at this power level
- BOP or AOP required for parameter changes beyond factory defaults

FAQ:

Q1: Is this the highest power 200V MM440 drive?
A: Yes. The 6SE6440-2UC34-5FA1 represents the maximum power rating available in the entire MICROMASTER 440 series for 200-240V input. For higher power at 200V, other Siemens drive families such as SINAMICS G120 would be required.

Q2: What is the difference between constant torque (45kW) and square-law torque (55kW) ratings?
A: Constant torque (45kW) applies to loads requiring consistent torque across speed range—conveyors, positive displacement pumps, extruders. Square-law (55kW) applies to centrifugal pumps and fans, where torque increases with speed squared, allowing the same drive to handle a larger motor due to the lower torque requirements at reduced speeds.

Q3: What are the installation requirements for this maximum power model?
A: At 45kW constant torque, input current is 135A; output current is 154A. Supply conductors must be sized for at least 135A plus safety margin per local code. Cabinet cooling must be engineered for the drive's heat dissipation (approximately 3% loss at full load = 1.35kW). Forced ventilation is required.

Q4: What should customers consider for future drive requirements?
A: Since MM440 is discontinued, customers requiring drives in this power range should consider the SINAMICS G120 series. G120 offers comparable or superior performance with active line modules and regenerative capabilities, and remains in active production with long-term support.

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