Industrial Motor Control Solution – Siemens 6SE6440-2UD31-8DA1 | MICROMASTER 440 Series
Where This Product Is Used
The Siemens 6SE6440-2UD31-8DA1 MICROMASTER 440 18.5 kW variable frequency drive (VFD) is engineered for demanding industrial motor control applications. Engineers and system integrators specify this drive across a wide range of sectors:
- Pump & Water Treatment Plants – Precise flow control for centrifugal pumps, reducing energy consumption by up to 50% vs. throttle-valve methods.
- HVAC & Building Automation – Fan speed regulation in air-handling units, cooling towers, and ventilation systems for large commercial buildings.
- Conveyor & Material Handling – Smooth start/stop and variable speed on belt conveyors, roller tables, and sorting lines in logistics and manufacturing.
- Compressor Control – Load-matched speed control for screw and reciprocating compressors in oil & gas and chemical plants.
- Crane & Hoist Systems – Controlled acceleration/deceleration for overhead cranes and hoists in steel mills and shipyards.
- Textile & Paper Mills – Tension-controlled winding/unwinding and draw-roll speed synchronization.
- Food & Beverage Processing – Motor drives for mixers, extruders, and bottling lines requiring precise torque control.
Technical Specifications
| Part Number (SKU) | 6SE6440-2UD31-8DA1 |
| Series | MICROMASTER 440 (MM440) |
| Manufacturer | Siemens AG |
| Rated Output Power | 18.5 kW (25 HP) |
| Input Voltage | 3 AC 380 – 480 V (±10%) |
| Input Frequency | 47 – 63 Hz |
| Output Frequency Range | 0 – 650 Hz |
| Rated Output Current | 37.5 A (CT) / 38 A (VT) |
| Overload Capacity | 150% for 60 s (CT); 110% for 60 s (VT) |
| Control Method | V/f, FCC, Sensorless Vector, Closed-Loop Vector |
| Protection Class | IP20 (chassis) |
| Ambient Temperature | -10 °C to +50 °C |
| Communication | USS / RS-485; PROFIBUS DP via CB15 option board |
| Braking | DC braking; Dynamic braking via external resistor |
| Weight | ~16 kg |
| Certifications | CE, UL, cUL, C-Tick |
Why Engineers Specify This Model
- Proven MICROMASTER 440 Platform – Over two decades of field-proven reliability in harsh industrial environments worldwide.
- Advanced Vector Control – Sensorless and closed-loop vector modes deliver high dynamic response and precise torque at low speeds, critical for hoists and extruders.
- Wide Output Frequency Range (0–650 Hz) – Supports high-speed spindle applications beyond standard 50/60 Hz motors.
- Flexible Communication – Native USS/RS-485 and optional PROFIBUS DP (CB15) enable seamless integration with Siemens S7 PLCs and third-party SCADA systems.
- Built-in PID Controller – Eliminates the need for an external PLC loop for simple closed-loop process control (pressure, flow, temperature).
- Comprehensive Protection – Over-voltage, under-voltage, over-current, over-temperature, ground fault, and motor stall protection reduce unplanned downtime.
- Energy-Saving Mode (AEO) – Automatic energy optimization reduces motor flux at partial loads, cutting energy costs in pump and fan applications.
Complete System Bill of Materials
For a fully operational drive system, engineers typically specify the following accessories alongside the 6SE6440-2UD31-8DA1:
- EMC Filter – 6SE6400-2FA02-0AB0 (Class A) or 6SE6400-2FB02-0AB0 (Class B)
- Line Reactor (Input Choke) – 6SE6400-3CC02-2CD3 to reduce harmonic distortion
- Braking Resistor – 6SE6400-4BD22-2CA0 for high-inertia load applications
- Operator Panel (BOP/AOP) – 6SE6400-0BP00-0AA0 (Basic) or 6SE6400-0AP00-0AA0 (Advanced)
- PROFIBUS Option Board – 6SE6400-1PB00-0AA0 (CB15) for fieldbus integration
- Output Reactor (dU/dt Filter) – 6SE6400-3TC05-4DD0 for motor cable runs >50 m
- Suggested Motor – Siemens 1LE1 or 1LA7 series 18.5 kW 4-pole 380V induction motor
Compliance & Industry Standards
- CE Marking – EU Low Voltage Directive 2014/35/EU and EMC Directive 2014/30/EU
- UL 508C – Power Conversion Equipment (UL & cUL listed)
- IEC 61800-3 – Adjustable speed electrical power drive systems – EMC requirements
- IEC 61800-5-1 – Safety requirements for adjustable speed electrical power drive systems
- EN 55011 / CISPR 11 – Industrial radio disturbance characteristics
- RoHS Compliant – Directive 2011/65/EU
Quality Assurance & Sourcing
At Konmask.com, every unit of the Siemens 6SE6440-2UD31-8DA1 is subject to our rigorous quality process:
- ✅ Authenticity Verification – Cross-checked against Siemens factory serial number databases and holographic labels.
- ✅ Functional Pre-shipment Test – Power-on test, parameter read-back, and output voltage verification before dispatch.
- ✅ Original Packaging – Shipped in OEM Siemens packaging with full documentation.
- ✅ Traceability – Full supply chain documentation available on request (invoice, COO certificate, test report).
- ✅ Warranty – 12-month warranty against manufacturing defects; RMA support available.
How to Source This Part
- Add to Cart – Proceed to checkout. We accept T/T bank transfer, PayPal, and major credit cards.
- Request a Quote – For bulk orders (>3 units), email [email protected] for volume pricing and lead-time confirmation.
- Expedited Sourcing – If the item shows Out of Stock, contact us directly. We can source within 3–7 business days for most regions.
- Export & Customs – We handle export documentation (commercial invoice, packing list, HS code 8504.40) for international shipments to EU, US, Southeast Asia, and Middle East.
Application-Specific FAQ
Q: Can the 6SE6440-2UD31-8DA1 control a pump in a closed-loop pressure system without an external PLC?
A: Yes. The built-in PID controller (P2200–P2295 parameter group) accepts a 4–20 mA or 0–10 V feedback signal from a pressure transducer and regulates motor speed autonomously.
Q: What is the maximum motor cable length before an output reactor is required?
A: Siemens recommends an output reactor for cable lengths exceeding 50 m (shielded) or 100 m (unshielded) to protect motor insulation from voltage spikes.
Q: Is this drive compatible with Siemens S7-300/S7-400 PLCs via PROFIBUS?
A: Yes, with the optional CB15 PROFIBUS DP option board (6SE6400-1PB00-0AA0). The drive uses the PROFIdrive profile for seamless integration.
Q: Can it operate in a high-ambient-temperature environment (45–50 °C)?
A: Yes, with derating. At 50 °C, output current must be derated by approximately 10%. Ensure adequate ventilation clearance (100 mm top/bottom, 25 mm sides).
Q: What is the difference between CT and VT mode?
A: CT mode (150% overload for 60 s) is for conveyors, hoists, and extruders requiring high starting torque. VT mode (110% overload) is optimized for pumps and fans where torque demand increases with speed squared.
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