Siemens MICROMASTER MM400 VFD 1.1kW 380-480V 3-Phase 6SE6420-2UD21-1AA1

Siemens MM400 VFD 1.1kW – Mid-Range Power, Same Compact Footprint

The Siemens MICROMASTER MM400, model 6SE6420-2UD21-1AA1, delivers 1.1kW output power while maintaining the same compact 173mm chassis as the smaller 0.75kW model – offering higher power density without increasing cabinet space.

Key Specifications:
- Output Power: 1.1kW (constant torque)
- Input Voltage: 380-480V AC 3-phase, 50/60Hz
- Rated Output Current: 3.0A
- Built-in Filter: Class A
- Protection Class: IP20
- Operating Temperature: 0°C to 50°C
- Dimensions: 173mm × 73mm × 149mm
- Weight: 1.4kg

Typical Applications:
- Industrial conveyors (800-1000mm width)
- Medium-capacity pumps (5-10 m³/h)
- Industrial mixers and blenders
- Small compressors (screw type)
- Packaging machinery (flow wrappers)

Why This Model?
The 1.1kW model shares the same compact dimensions as the 0.37kW-0.75kW models but delivers nearly three times the power. This makes it ideal for retrofits where cabinet space is fixed but higher power is needed. In a packaging line upgrade, replacing 0.75kW drives with 1.1kW units allowed a 25% line speed increase without modifying control cabinets.

Selection Guide:
Step up to 1.1kW when your motor exceeds 0.75kW or when high starting torque is required. The compact size means no cabinet redesign when upgrading from smaller MM400 models.

FAQ:

Q1: How much starting torque does this provide?
A: Up to 150% of rated torque at 2Hz with proper parameter adjustment (boost settings). This is sufficient for most conveyor and pump starting requirements.

Q2: Does this include an EMC filter?
A: Yes. Built-in Class A filter meets industrial EMC standards. The filter can be disconnected via a removable jumper if external filtering is preferred.

Q3: What is the maximum switching frequency?
A: Adjustable from 2kHz to 16kHz. Higher switching frequencies reduce motor noise but increase drive losses. Default 4kHz is optimal for most applications.

Q4: Can this be used in parallel with other drives?
A: No. MM400 does not support master-follower parallel operation. For synchronized multi-motor applications, consider the G120 series with CU250S control unit.

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