Siemens MICROMASTER 440 VFD 7.5kW 200-240V 3-Phase 6SE6440-2UC27-5DA1

Siemens MICROMASTER 440 VFD 7.5kW – D-Size Vector Drive for High-Power Systems

The Siemens MICROMASTER 440, model 6SE6440-2UC27-5DA1, delivers 7.5kW constant torque output power with 200-240V 3-phase input, with square-law torque rating extending to 11kW for pump and fan applications[reference:48]. This D-size drive represents the entry point to the larger D-size chassis, providing significantly increased thermal capacity and current handling for high-power applications.

The transition from C-size to D-size chassis brings substantial benefits: improved heat dissipation for continuous heavy-duty operation, larger terminals for heavier gauge wiring, and enhanced physical construction for vibration resistance in demanding industrial environments. The D-size chassis (520×275×245mm) allows the drive to handle output currents up to 28A while maintaining a -10°C to +50°C operating range[reference:49].

For applications requiring the combination of vector control precision and higher power output, this 7.5kW model delivers. The advanced sensorless vector control algorithm provides 100% rated torque down to 0.5 Hz without encoder feedback, making it suitable for mixers handling heavy materials, extruders requiring consistent throughput, and conveyors starting under full load.

Key Specifications:
- Output Power: 7.5 kW (constant torque) / 10 HP
- Square-Law Torque Power: 11 kW (pumps, fans, centrifugal loads)[reference:50]
- Input Voltage: 200-240V AC 3-phase, +10/-10%, 47-63Hz[reference:51]
- Rated Output Current: 28 A (nominal)
- Output Frequency: 0-650 Hz
- Overload Capacity: 150% for 60 s, 200% for 3 s[reference:52]
- Protection Class: IP20[reference:53]
- Operating Temperature: -10°C to +50°C[reference:54]
- Dimensions (H×W×D): 520mm × 275mm × 245mm[reference:55]
- Weight: Approx. 16 kg[reference:56]
- Filter: Without built-in filter
- Frame Size: D

Typical Applications:
- Large industrial conveyors and material handling systems
- High-power centrifugal fans and blowers
- Large centrifugal pumps for water/wastewater
- Medium extruders for plastics, rubber, and food products
- Heavy-duty mixers and kneaders (concrete, dough, chemicals)
- Small to medium screw compressors
- Woodworking machinery (large planers, CNC routers)
- Industrial washers and dryers

Key Features:
- Sensorless vector control delivers 100% torque down to 0.5 Hz without feedback
- Built-in braking chopper for dynamic braking (external resistor required)
- BiCo technology for custom I/O signal routing
- 6 digital inputs, 2 analog inputs, 2 analog outputs, 3 relay outputs
- Integrated Modbus RTU (RS-232 and RS-485) for network integration
- Flying restart for capturing spinning motors
- DC injection braking for zero-speed holding torque
- PID controller for closed-loop process control (pressure, flow, level, temperature)
- 4 skip frequencies for mechanical resonance avoidance
- Adjustable PWM frequency for audible noise optimization
- Automatic restart after fault clearing with configurable attempts

D-Size Chassis Advantages:
The D-size chassis marks a significant step up in physical scale and capability. The 520mm height provides ample surface area for heat dissipation during continuous high-power operation. The larger enclosure also accommodates heavier bus bars and power components necessary for 28A current handling. For control cabinet design, all D-size models (7.5kW-15kW within MM440 200V) share identical mounting dimensions, allowing power upgrades without cabinet redesign.

Important Notes:
- This product is discontinued (PM410). Available ONLY as a spare part
- Requires 3-phase input only
- For new installations, Siemens recommends SINAMICS G120 series
- A BOP or AOP is required for parameter configuration beyond factory defaults
- Verify available power supply capacity for 28A current draw

FAQ:

Q1: What makes the D-size chassis different from C-size?
A: D-size (520×275×245mm) is significantly larger than C-size (245×185×195mm), providing higher current capacity (28A vs 22A), improved thermal dissipation for continuous operation, and larger terminal blocks for heavier gauge wiring. D-size is required for 7.5kW and above constant torque ratings.

Q2: What is the actual output current at 7.5kW?
A: At 7.5kW constant torque, the nominal output current is approximately 28A. For square-law torque applications (11kW), consult the technical data for specific current values based on load profile.

Q3: How much cooling clearance does this D-size drive require?
A: Allow 100mm clearance above and below the drive for natural convection cooling. If mounted in a sealed or semi-sealed cabinet, forced ventilation may be required to maintain ambient temperature below 50°C.

Q4: Can this drive be used for pump applications requiring PID control?
A: Yes. The built-in PID controller can regulate pressure, flow, or level using a 4-20mA or 0-10V sensor signal. Parameters are configurable for PI gain settings and process setpoint.

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