Siemens MICROMASTER MM400 VFD 0.75kW 380-480V 3-Phase 6SE6420-2UD17-5AA1

Siemens MM400 VFD 0.75kW – The Versatile General Purpose Drive

The Siemens MICROMASTER MM400, model 6SE6420-2UD17-5AA1, delivers 0.75kW output power. This is the highest volume model in the entire MM400 series, serving as the go-to choice for countless industrial applications.

Key Specifications:
- Output Power: 0.75kW (constant torque)
- Input Voltage: 380-480V AC 3-phase, 50/60Hz
- Rated Output Current: 2.1A
- Built-in Filter: Class A
- Protection Class: IP20
- Operating Temperature: 0°C to 50°C
- Dimensions: 173mm × 73mm × 149mm
- Weight: 1.3kg

Typical Applications:
- Medium conveyors (500-800mm width)
- Circulating pumps and booster pumps
- Industrial exhaust fans
- Small reciprocating compressors
- Mixing equipment (liquid blending)

Why This Model?
The 0.75kW model is the best-seller for good reason – it covers the majority of small-to-medium industrial equipment. Compared to the 0.55kW model, output current increases 31% (2.1A vs 1.6A), providing significantly more starting torque. In a beverage filling line upgrade, replacing fixed-speed motors with MM400 0.75kW drives reduced annual energy consumption by 3,200 kWh per line – an 8-month payback period.

Selection Guide:
The 0.75kW rating is the "sweet spot" for general industrial use. Even if your motor is rated 0.55kW, selecting the 0.75kW drive provides headroom for future load increases and runs cooler at partial load, extending drive life.

FAQ:

Q1: Can this drive control pump pressure?
A: Yes. The built-in PID controller can maintain constant pressure using a 4-20mA or 0-10V pressure transmitter signal. Configure parameter P2200 to enable PID control.

Q2: Does this model include a braking transistor?
A: Yes. Unlike the 0.37kW model, the 0.75kW variant includes a built-in braking transistor. An external braking resistor is required for dynamic braking applications.

Q3: What communication protocols are supported?
A: Standard RS-485 Modbus RTU. Optional PROFIBUS and DeviceNet modules are available as add-ons (order separately).

Q4: How does this compare to the G120 series?
A: MM400 is an economy general-purpose drive for basic speed control. G120 is a modular high-performance series supporting advanced control modes (vector control, servo positioning) and more communication protocols (PROFINET, EtherCAT).

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