Siemens 6SE6440-2UD34-5FA1 – 45kW Constant Torque Variable Frequency Drive | MICROMASTER 440 Platform
Engineering Background
The Siemens MICROMASTER 440 (MM440) series represents one of the most widely deployed general-purpose drive platforms in industrial automation. Engineered for demanding constant-torque and variable-torque applications, the MM440 integrates advanced vector control, comprehensive protection circuitry, and a modular I/O architecture that satisfies the requirements of both OEM machine builders and end-user plant engineers. The 6SE6440-2UD34-5FA1 is the 45 kW three-phase 380–480 V variant, optimized for high-inertia loads requiring full torque at low speed.
Product Positioning
This drive is the preferred selection for procurement engineers specifying reliable, field-proven motion control in pumps, compressors, conveyors, extruders, hoists, and HVAC systems. Its closed-loop vector capability (with optional encoder feedback) and built-in PID controller reduce external BOM cost while delivering sub-1% speed regulation accuracy. Konmask.com stocks this unit as a genuine Siemens OEM component, fully traceable to authorized distribution channels.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Order Number | 6SE6440-2UD34-5FA1 |
| Series | MICROMASTER 440 |
| Rated Output Power | 45 kW (60 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 Output Current (CT) | 90 A |
| Overload Capacity (CT) | 150% for 60 s / 200% for 3 s |
| Control Mode | V/f, Flux Current Control (FCC), Sensorless Vector (SLVC), Closed-Loop Vector (VC) |
| Speed Regulation Accuracy | ±0.01% (VC with encoder) / ±0.5% (SLVC) |
| Torque Response | < 5 ms (VC mode) |
| Switching Frequency | 2 – 16 kHz (adjustable) |
| Digital Inputs | 6 × programmable DI (PNP/NPN selectable) |
| Analog Inputs | 2 × AI (0–10 V / 0–20 mA / 4–20 mA) |
| Digital Outputs | 3 × relay outputs (30 V DC / 250 V AC, 2 A) |
| Analog Output | 2 × AO (0–20 mA) |
| Serial Communication | RS-485 (USS protocol); optional PROFIBUS-DP, DeviceNet, CANopen via CB module |
| Protection Class | IP20 (chassis); IP54 available with optional filter kit |
| Cooling Method | Forced air (internal fan) |
| Ambient Temperature | -10 °C to +50 °C (derate above 40 °C) |
| Storage Temperature | -40 °C to +70 °C |
| Altitude | Up to 1000 m (derate above) |
| Humidity | ≤ 95% RH, non-condensing |
| EMC Filter | Built-in Class A (optional Class B) |
| Braking | DC braking; dynamic braking via external resistor |
| Dimensions (H × W × D) | Approx. 520 × 275 × 245 mm (Frame Size F) |
| Weight | ~5.6 kg |
| Certifications | CE, UL, cUL, C-Tick |
| Standards | IEC 61800-2, IEC 61800-3, EN 55011 |
Proven Application Environments
- Pumps & Compressors – Built-in PID loop enables closed-loop pressure/flow control without external controller; energy savings up to 50% vs. throttle-valve regulation.
- Conveyors & Material Handling – Constant-torque overload rating (150%/60 s) handles heavy start-up loads; smooth ramp profiles prevent belt slip.
- Extruders & Mixers – Sensorless vector mode delivers high torque at near-zero speed for viscous-material processing.
- Hoists & Cranes – Closed-loop vector with encoder feedback provides precise speed hold under variable load; integrated brake control relay.
- HVAC Fan Drives – Variable-torque mode with energy-optimization function reduces motor losses at partial load.
- Machine Tools – High switching frequency (up to 16 kHz) minimizes audible noise; fast torque response supports spindle applications.
Engineering Advantages
- Four Control Modes in One Unit – V/f, FCC, SLVC, and VC selectable via parameter P1300; no hardware change required when upgrading control strategy.
- Kinetic Buffering (KIB) – Maintains drive operation during brief mains interruptions by extracting kinetic energy from the load, preventing nuisance trips.
- Automatic Restart – Configurable auto-restart after fault or power loss; flying restart (catch spinning motor) eliminates mechanical shock on reconnection.
- Comprehensive Protection – Over/under-voltage, over-current, over-temperature (motor & drive), ground fault, phase loss, stall prevention, and I²t motor thermal model.
- Modular Fieldbus Expansion – Single CB slot accepts PROFIBUS-DP, DeviceNet, or CANopen communication boards; future-proof for DCS/SCADA integration.
- Parameter Cloning – BOP/AOP operator panel stores full parameter set; rapid commissioning of replacement units in multi-drive installations.
- Free Function Blocks (FFB) – 14 programmable logic blocks (AND, OR, timers, comparators) enable simple PLC-like sequencing without external hardware.
System Architecture & Signal Flow
The 6SE6440-2UD34-5FA1 follows a standard AC-DC-AC conversion topology:
- Rectifier Stage – 6-pulse uncontrolled diode bridge converts 3-phase AC mains to DC bus (~540–680 V DC at nominal input).
- DC Link – Electrolytic capacitor bank smooths DC bus; pre-charge circuit limits inrush current at power-on.
- IGBT Inverter Stage – 6 × IGBT modules synthesize variable-frequency, variable-voltage 3-phase output via SPWM/SVM modulation.
- Control Board – 32-bit DSP executes motor model, current regulators, and speed/torque loops at 125 µs cycle time.
- I/O Interface – Terminal strip X1–X9 provides all digital/analog I/O; USS/RS-485 on X2; optional CB fieldbus on slot A.
- Operator Panel Port – RJ45-compatible BOP/AOP interface for local parameter access and diagnostics.
Sourcing & Quality Verification
- OEM Authenticity – All units sourced through authorized Siemens distribution channels; serial numbers verifiable via Siemens Industry Online Support (SIOS).
- Inspection Protocol – Each unit undergoes incoming inspection: label verification, firmware version check, insulation resistance test, and functional power-on test before dispatch.
- Packaging – Shipped in original Siemens anti-static packaging with foam inserts; humidity indicator card included for long-distance freight.
- Documentation – Siemens operating instructions (A5E00289173), parameter list, and CE declaration of conformity supplied with each unit.
- Warranty – 12-month Konmask warranty covering manufacturing defects; Siemens factory warranty terms apply where applicable.
Procurement Process
- Submit RFQ via support@konmask.com or WhatsApp +0086 19859288691 with quantity and required delivery date.
- Receive formal quotation with lead time, unit price, and shipping options (DHL Express / sea freight / air freight) within 24 business hours.
- Confirm purchase order; proforma invoice issued for T/T or L/C payment.
- Unit dispatched with tracking number and scanned shipping documents (packing list, commercial invoice, COO).
- Post-delivery technical support available via email for commissioning assistance.
Technical FAQ
Q: Can this drive operate in constant-torque mode with a standard induction motor without an encoder?
A: Yes. Sensorless vector control (SLVC, P1300=20) delivers ≥150% rated torque from ~2 Hz without encoder feedback. For full torque at 0 Hz, closed-loop vector (VC) with HTL/TTL encoder is required.
Q: What is the minimum braking resistor specification for this unit?
A: For 45 kW / 90 A output, the minimum braking resistor is 6.8 Ω / 25 kW continuous (Siemens order no. 6SE6400-4BD22-2EA0 or equivalent). Peak braking power is ~90 kW for 12 s.
Q: Is PROFIBUS-DP communication supported natively?
A: Not natively. The optional PROFIBUS-DP communication board (6SE6400-1PB00-0AA0) plugs into slot A and enables full DP-V1 cyclic and acyclic communication with Siemens S7 PLCs and third-party masters.
Q: What derating applies above 40 °C ambient?
A: Output current must be derated by 1% per °C above 40 °C, up to a maximum of 50 °C. Above 50 °C, operation is not permitted without additional forced cooling measures.
Q: Can multiple drives share a common DC bus?
A: The MM440 does not natively support common DC bus operation. For regenerative or common-bus applications, consider the Siemens SINAMICS S120 platform.
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