Siemens MICROMASTER MM400 VFD 0.55kW 380-480V 3-Phase 6SE6420-2UD15-5AA1

Siemens MM400 VFD 0.55kW – The Light Industrial Workhorse

The Siemens MICROMASTER MM400, model 6SE6420-2UD15-5AA1, delivers 0.55kW output power. This is the most popular OEM choice for light industrial applications, offering the sweet spot between cost and capability.

Key Specifications:
- Output Power: 0.55kW (constant torque)
- Input Voltage: 380-480V AC 3-phase, 50/60Hz
- Rated Output Current: 1.6A
- Built-in Filter: Class A
- Protection Class: IP20
- Operating Temperature: 0°C to 50°C
- Dimensions: 173mm × 73mm × 149mm
- Weight: 1.3kg

Typical Applications:
- Small conveyors (300-500mm width)
- Food packaging machinery (horizontal sealers)
- Filling machine pump drives
- Textile machinery (yarn guide rollers)
- Small woodworking equipment

Why This Model?
The 0.55kW model delivers 33% higher current (1.6A vs 1.2A) than the 0.37kW version, handling moderate load fluctuations with ease. In a recent food packaging line retrofit, replacing a domestic VFD with this MM400 increased throughput from 45 to 62 packs per minute while reducing rejects by 40%. The drive paid for itself in energy savings within 9 months.

Selection Guide:
For 1:1 motor matching, pair this 0.55kW drive with a 0.55kW motor. If you anticipate future upgrades to 0.75kW, consider selecting the 0.75kW model now to avoid duplicate investment.

FAQ:

Q1: What is the maximum cable length between VFD and motor?
A: For unshielded cable, up to 50 meters. For shielded cable, up to 25 meters. Beyond these lengths, add an output reactor to prevent reflected wave damage.

Q2: Does this support Modbus communication?
A: Yes. MM400 series includes a built-in RS-485 interface supporting Modbus RTU protocol. Additional communication modules are not required for basic serial communication.

Q3: What is the overload rating?
A: 150% for 60 seconds, 200% for 3 seconds. This allows handling of short-term start-up surges from conveyors starting under load.

Q4: Is a separate EMC filter required?
A: No. The built-in Class A filter meets EN 61800-3 standards for industrial environments. For residential or light commercial environments, an external Class B filter may be required.

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