Siemens MICROMASTER 440 VFD 4.0kW 200-240V 3-Phase 6SE6440-2UC24-0CA1

Siemens MICROMASTER 440 VFD 4.0kW – High-Torque Vector Drive for Demanding Loads

The Siemens MICROMASTER 440, model 6SE6440-2UC24-0CA1, delivers 4.0kW constant torque output power with 200-240V 3-phase input. This C-size unfiltered drive represents the highest power rating in the C-size chassis for 200V input, offering exceptional performance for applications requiring high starting torque and stable speed regulation under varying loads.

One of the key advantages of this model is its ability to deliver 150% torque for 60 seconds, providing the necessary margin for high-inertia loads such as large fans starting against closed dampers, conveyors beginning motion under full load, and mixers processing cold or viscous materials. Under variable torque square-law conditions (pumps, fans), this drive can handle up to 5.5kW[reference:33].

The drive incorporates the advanced vector control algorithms that made the MM440 series a benchmark in its class. It maintains consistent torque delivery even when load conditions change abruptly, without requiring encoder feedback.

Key Specifications:
- Output Power: 4.0 kW (constant torque) / 5.4 HP
- Input Voltage: 200-240V AC 3-phase only, +10/-10%, 47-63Hz
- Output Frequency: 0-650 Hz
- Overload Capacity: 150% for 60 s, 200% for 3 s
- Protection Class: IP20
- Operating Temperature: -10°C to +50°C
- Dimensions (H×W×D): 245mm × 185mm × 195mm[reference:34]
- Weight: 5.5 kg[reference:35]
- Filter: Without built-in filter
- Frame Size: C

Typical Applications:
- Medium industrial conveyors operating under variable load
- High-inertia fans and large blowers
- Positive displacement pumps with viscosity variations
- Industrial mixers and kneaders for heavy materials
- Small to medium extruders
- Machine tool spindle drives requiring torque at low speeds

Key Features:
- Sensorless vector control provides 100% torque down to 0 Hz without feedback
- Built-in braking chopper enables dynamic braking (external resistor required)
- BiCo technology for custom I/O configuration
- 6 digital inputs, 2 analog inputs (0-10V scalable), 2 analog outputs, 3 relay outputs
- Integrated Modbus RTU communication (RS-232 and RS-485)
- Flying restart captures spinning motors
- DC injection braking for zero-speed holding
- Adjustable PWM frequency from 2 kHz to 16 kHz
- PID controller with proportional/integral (PI) gain adjustment

Thermal Performance:
The C-size chassis (245×185×195mm) provides improved thermal management over smaller frames, allowing the drive to maintain full rated output at ambient temperatures up to 50°C. For panel installation, allow 100mm clearance above and below the drive for adequate air circulation.

Important Notes:
- This product is discontinued (PM410). Available ONLY as a spare part[reference:36]
- Successor product reference available via SIOS ID 109746454[reference:37]
- Requires 3-phase input only—single-phase operation not supported at this power level
- A BOP or AOP is required for parameter configuration
- SINAMICS G120 series is the recommended replacement for new designs

FAQ:

Q1: Why does this model require 3-phase input?
A: At power levels above 3.0kW, the input current requirements exceed what can be practically drawn from single-phase supply within the same form factor. Higher power 200V models all require 3-phase input.

Q2: What is the difference between constant torque (4.0kW) and square-law torque (5.5kW) ratings?
A: Constant torque rating (4.0kW) applies to applications where load torque remains constant regardless of speed (conveyors, positive displacement pumps, mixers). Square-law rating (5.5kW) applies to centrifugal pumps and fans where torque increases with speed squared, allowing the same drive to handle higher motor power.

Q3: Can this drive be used for crane or hoist applications?
A: Yes, with proper configuration. The built-in braking chopper supports dynamic braking for lowering loads. However, hoist applications typically require additional safety components (mechanical brake contactor, safety relays) and programming per local regulations.

Q4: What is the maximum altitude for this drive?
A: Rated operation is up to 1000 meters above sea level. For higher altitudes, derate output current by 1% per 100m above 1000m, up to a maximum of 4000m.

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