Siemens MICROMASTER 440 VFD 1.5kW 200-240V 1/3-Phase 6SE6440-2UC21-5BA1

Siemens MICROMASTER 440 VFD 1.5kW – B-Size Vector Control for Enhanced Performance

The Siemens MICROMASTER 440, model 6SE6440-2UC21-5BA1, delivers 1.5kW output power with 200-240V 1/3-phase input. This B-size unfiltered drive is engineered for applications requiring higher dynamic performance than standard V/f control can provide.

Unlike the MICROMASTER 420 series designed for basic motor control, the MM440 incorporates sensorless vector control technology, delivering consistent torque even under sudden load changes. It is ideally suited for applications requiring rapid accelerations, positioning tasks, and processes where load conditions fluctuate significantly[reference:9].

The drive comes with a built-in braking chopper, enabling dynamic braking when an external resistor is connected—essential for applications requiring quick deceleration such as positioning systems or conveyors with stopping precision requirements. Its modular design allows flexible configuration, while the BiCo (Binetor Connectivity) technology enables free interconnection of digital and analog signals to customize I/O functions for specific application needs[reference:10].

Key Specifications:
- Output Power: 1.5 kW (constant torque) / 2.0 HP
- Input Voltage: 200-240V AC 1/3-phase, +10/-10%, 47-63Hz
- Rated Output Current: Approx. 7.4 A (depending on input configuration)
- 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): 202mm × 149mm × 172mm[reference:11]
- Weight: 3.3 kg[reference:12]
- Filter: Without built-in filter
- Frame Size: B

Typical Applications:
- Small positioning systems and indexing tables
- Light-duty hoists and lifting equipment
- Small extruders and injection molding machines
- Automated assembly lines requiring precise speed control
- Small compressors and pumps with variable load conditions
- Packaging machinery requiring consistent torque under variable load

Key Features:
- Sensorless vector control provides 100% torque down to 0.5 Hz without encoder feedback
- Built-in braking chopper for dynamic deceleration (external resistor required)
- BiCo technology for flexible I/O configuration and signal routing
- 6 digital inputs, 2 analog inputs (0-10V / 0-20mA selectable), 2 analog outputs, 3 relay outputs
- Integrated RS-485 Modbus RTU interface (RS-232 also available)
- 15 fixed frequencies, 4 skip frequencies for resonance avoidance
- Flying restart for capturing spinning motors
- DC injection braking for zero-speed holding
- Adjustable PWM frequency from 2 kHz to 16 kHz for audible noise optimization

MICROMASTER 440 Series Overview:
The MM440 is Siemens' premium vector control drive within the MICROMASTER 4 family, offering superior dynamic performance compared to MM420. While MM420 excels at basic pump/fan and conveyor applications, MM440 handles demanding tasks including positioning, torque control, and applications with rapid load changes. Power range spans from 0.12kW to 250kW, making it suitable for machinery from small feeders to large industrial equipment[reference:13].

Important Notes:
- This product is discontinued (PM410: Product cancellation effective 01.10.2019)[reference:14]. Available ONLY as a spare part
- A Basic Operator Panel (BOP 6SE6400-0BP00-0AA1) or Advanced Operator Panel (AOP 6SE6400-0AP00-0AA1) is required for parameter changes beyond factory defaults
- For new installations, Siemens recommends the SINAMICS G120 series as the direct successor
- This model accepts single-phase or three-phase input—verify your power supply configuration
- The built-in filter is not included; external filters are available as accessories for EMC compliance

FAQ:

Q1: What is the key advantage of MM440 over MM420?
A: MM440 features sensorless vector control, providing superior torque performance at low speeds (100% torque down to 0.5 Hz) and better dynamic response under load changes. It also includes a built-in braking chopper for dynamic deceleration. MM420 offers V/f control suitable for basic constant torque applications.

Q2: Does this drive support single-phase input?
A: Yes. The 6SE6440-2UC21-5BA1 accepts both single-phase and three-phase 200-240V input. For single-phase operation, output current ratings may differ—consult the technical manual for derating information.

Q3: What is BiCo technology used for?
A: BiCo (Binetor Connectivity) allows free interconnection of the drive's input and output signals. You can route any digital input to any function, map analog signals to control parameters, and create custom control logic without external relays.

Q4: What is the maximum cable length between drive and motor?
A: For unshielded cable: up to 100 meters. For shielded cable: up to 50 meters. For longer runs beyond these limits, an output reactor is recommended to protect motor winding insulation from reflected wave damage.

📦 Spare Part – Limited Stock | Tech Support | Please confirm availability before ordering
Contact us for pricing and availability.
 

FAqS