Variable Speed Drive Solution – SIEMENS 6SE6440-2AD25-5CA1 | MICROMASTER 440
Where This Product Is Used
The SIEMENS 6SE6440-2AD25-5CA1 MICROMASTER 440 is a high-performance variable frequency drive (VFD) engineered for demanding industrial motor control applications. Engineers and system integrators specify this drive across a wide range of sectors:
- Water & Wastewater Treatment: Precise pump speed regulation for pressure-controlled water supply systems, sewage lift stations, and desalination plants.
- HVAC & Building Automation: Fan and blower speed control in air handling units (AHUs), cooling towers, and ventilation systems — delivering significant energy savings via affinity law optimization.
- Material Handling & Conveyors: Smooth start/stop and variable-speed control for belt conveyors, roller tables, and palletizing lines in logistics and manufacturing.
- Compressor Control: Soft-start and load-matching for screw and centrifugal compressors in industrial gas and refrigeration systems.
- Textile & Printing Machinery: Tension control and synchronized multi-axis speed matching in winding, unwinding, and printing lines.
- Food & Beverage Processing: Hygienic-compatible motor drives for mixers, fillers, and packaging lines requiring precise torque and speed profiles.
- Mining & Quarrying: Robust motor control for crushers, screens, and conveyor drives in harsh, dusty environments.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 6SE6440-2AD25-5CA1 |
| Series | MICROMASTER 440 (MM440) |
| Manufacturer | SIEMENS AG |
| Rated Output Power | 5.5 kW (7.5 HP) |
| Input Voltage | 3-Phase AC 380 – 480 V (±10%) |
| Input Frequency | 47 – 63 Hz |
| Output Voltage | 0 – Input Voltage (3-Phase) |
| Output Frequency Range | 0 – 650 Hz |
| Rated Input Current | ~14.0 A |
| Rated Output Current | 13.2 A (CT) / 12.0 A (VT) |
| Overload Capacity | 150% for 60 s (CT); 110% for 60 s (VT) |
| Control Mode | V/f, Sensorless Vector (FCC), Closed-Loop Vector (with encoder) |
| Protection Class | IP20 (chassis) |
| Ambient Temperature | -10 °C to +50 °C (derating above 40 °C) |
| Cooling Method | Forced air cooling (internal fan) |
| Communication | USS protocol (RS-485); optional PROFIBUS, DeviceNet, CANopen via CB |
| Braking | DC braking; dynamic braking (external resistor) |
| Weight | Approx. 1.5 kg |
| Dimensions (H×W×D) | Refer to SIEMENS datasheet 6SE6400-5BA00-0BP0 |
| Certifications | CE, UL, cUL, C-Tick |
Why Engineers Specify This Model
- Wide Output Frequency Range (0–650 Hz): Supports high-speed spindle applications beyond standard 50/60 Hz motor limits.
- Flux Current Control (FCC): Sensorless vector algorithm delivers high dynamic torque response without encoder feedback — reducing BOM cost and wiring complexity.
- Integrated PID Controller: Built-in closed-loop process control eliminates the need for an external PLC in simple pump/fan applications.
- Modular Communication Options: Plug-in communication boards (CB) enable seamless integration into PROFIBUS DP, DeviceNet, or CANopen networks.
- Kinetic Buffering: Ride-through capability during brief power interruptions prevents nuisance trips on critical process lines.
- Extensive I/O: 6 digital inputs, 2 analog inputs, 3 digital outputs, 2 analog outputs — sufficient for most standalone applications without additional I/O modules.
- SIEMENS Ecosystem Compatibility: Fully compatible with SIMATIC S7 PLCs, SINAMICS parameter migration tools, and STARTER commissioning software.
Complete System Bill of Materials
For a fully operational drive system, engineers typically specify the following alongside the 6SE6440-2AD25-5CA1:
- EMC Filter: 6SE6400-2FA00-6AD0 (Class A) or 6SE6400-2FB00-6AD0 (Class B) — required for CE compliance in residential/light-industrial environments.
- Line Reactor (Input Choke): 6SE6400-3CC05-5FD0 — reduces harmonic distortion and protects against supply voltage spikes.
- Braking Resistor: 6SE6400-4BD16-5CA0 — for applications with high-inertia loads requiring fast deceleration.
- Operator Panel (BOP/AOP): 6SE6400-0BP00-0AA0 (BOP) / 6SE6400-0AP00-0AA0 (AOP) — for local parameter setting and diagnostics.
- PROFIBUS Communication Board: 6SE6400-1PB00-0AA0 — for integration into SIMATIC or third-party PROFIBUS DP networks.
- Output Reactor: 6SE6400-3TC05-4DD0 — recommended for motor cable lengths exceeding 50 m to limit dV/dt stress on motor windings.
Compliance & Industry Standards
- CE Marking: Compliant with EU Low Voltage Directive (2014/35/EU) and EMC Directive (2014/30/EU).
- UL / cUL Listed: Recognized under UL 508C (Power Conversion Equipment) for North American markets.
- C-Tick: Compliant with Australian EMC framework.
- IEC 61800-3: Meets Category C2 EMC requirements (with appropriate filter).
- IEC 61800-5-1: Safety requirements for adjustable speed electrical power drive systems.
- RoHS Compliant: Restriction of Hazardous Substances Directive 2011/65/EU.
Quality Assurance & Sourcing
At Konmask.com, every SIEMENS MICROMASTER 440 unit undergoes a structured verification process before dispatch:
- Authenticity Verification: Units are cross-referenced against SIEMENS factory serial number databases and holographic label authentication.
- Functional Pre-Test: Power-on test confirming display initialization, parameter access, and I/O continuity.
- Condition Grading: Clearly stated as New, Refurbished-Grade A, or Surplus — no ambiguity.
- Secure Packaging: Anti-static ESD bags, foam-lined cartons, and moisture-barrier sealing for international transit.
- Traceability: Full lot and batch documentation available on request for MRO and OEM procurement teams.
How to Source This Part
Ready to procure the SIEMENS 6SE6440-2AD25-5CA1? Here’s how to get started:
- Add to Cart: In-stock units ship within 1–3 business days from our warehouse.
- Request a Quote (RFQ): For volume orders (5+ units), contact support@konmask.com for tiered pricing.
- Technical Pre-Sales Support: Our engineering team can assist with drive sizing, BOM validation, and compatibility checks — free of charge.
- Lead Time for Out-of-Stock: Typical sourcing lead time is 7–21 business days depending on global supply chain availability.
- Export & Customs: We handle export documentation (CO, packing list, commercial invoice) for international shipments. HS Code: 8504.40.
Application-Specific FAQ
Q: Can the 6SE6440-2AD25-5CA1 control a 4 kW motor?
A: Yes. The drive is rated for 5.5 kW and can safely control motors from 0.75 kW up to its rated capacity. For a 4 kW motor, no derating is required under standard CT load conditions.
Q: Is an external EMC filter mandatory?
A: The MM440 chassis unit does not include an integrated EMC filter. For CE compliance in Category C2 environments, an external filter (e.g., 6SE6400-2FA00-6AD0) must be installed on the input side.
Q: Can this drive be used with a single-phase input supply?
A: No. The 6SE6440-2AD25-5CA1 requires a 3-phase 380–480 V AC supply. For single-phase applications, refer to the MICROMASTER 420 series (1AC variants).
Q: What is the maximum motor cable length without an output reactor?
A: SIEMENS recommends a maximum of 50 m (shielded) without an output reactor. Beyond this, install a dV/dt filter or output reactor to protect motor insulation.
Q: Is PROFIBUS DP communication supported natively?
A: Not natively. PROFIBUS DP requires the optional CB PROFIBUS communication board (6SE6400-1PB00-0AA0) installed in the drive’s option slot.
Q: What commissioning software is compatible?
A: SIEMENS STARTER software (v4.x and above) and SINAMICS Startdrive (TIA Portal V14+) both support MM440 parameter upload/download via the RS-485 USS interface or optional PC cable (6SE6400-1PC00-0AA0).
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