Siemens MICROMASTER MM400 VFD 2.2kW 380-480V 3-Phase 6SE6420-2UD22-2BA1

Siemens MM400 VFD 2.2kW – Enhanced with Braking and Class B Filter

The Siemens MICROMASTER MM400, model 6SE6420-2UD22-2BA1, delivers 2.2kW output power. The "BA1" suffix indicates enhanced features – a built-in braking transistor and Class B EMC filter – making this model suitable for applications requiring rapid deceleration or operating in sensitive environments.

Key Specifications:
- Output Power: 2.2kW (constant torque)
- Input Voltage: 380-480V AC 3-phase, 50/60Hz
- Rated Output Current: 5.6A
- Built-in Filter: Class B (enhanced filtering)
- Braking Transistor: Built-in
- Protection Class: IP20
- Operating Temperature: 0°C to 50°C
- Dimensions: 245mm × 185mm × 195mm (larger chassis)
- Weight: 3.2kg

Typical Applications:
- High-inertia conveyors (long belt or heavy load)
- Centrifuges and decanters
- Vertical lifts and hoists
- Industrial mixers with high starting torque
- Applications requiring rapid deceleration

Why This Model?
The 2.2kW model transitions to the larger chassis size (245mm height) for improved heat dissipation. The built-in braking transistor allows dynamic braking with an external resistor – essential for high-inertia loads or vertical applications. The Class B filter provides better EMI suppression than Class A, meeting stricter residential and light industrial requirements.

Selection Guide:
Choose the "BA1" suffix (this model) over "AA1" when you need dynamic braking capability or operate in EMI-sensitive environments. For basic applications without braking requirements, the "AA1" variant may be more economical.

FAQ:

Q1: What braking torque can this achieve?
A: With an appropriately sized external braking resistor (minimum 60 ohm, 200W), braking torque up to 150% of rated torque is achievable. Braking duty cycle should not exceed 10%.

Q2: What is the difference between Class A and Class B filters?
A: Class A is for industrial environments where stricter EMI limits are not required. Class B provides tighter emission limits suitable for residential, commercial, and light industrial environments with sensitive equipment.

Q3: Can I disable the braking transistor if not needed?
A: Yes. Parameter P1237 sets braking duty cycle. Set to 0 to disable braking function. The braking transistor can remain installed without external resistor.

Q4: What size external braking resistor is recommended?
A: Minimum resistance 60 ohms, minimum power rating 200W continuous, 2000W peak (for 3 seconds). Siemens recommends 6SE6400-4BR22-2EA0 accessory resistor.

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