6SE6440-2UD38-8FB1 MICROMASTER 440 unfiltered high-power AC drive

Documented micromaster 440 unfiltered high-power ac drive function and system position for 6SE6440-2UD38-8FB1

Documented drive function

Rebuilt from individual evidence

The exact-reference product page identifies 6SE6440-2UD38-8FB1 as a Siemens MICROMASTER 440 without-filter inverter.

The drive occupies the high-power motor-control stage between the three-phase supply and an industrial machine motor.

Exact reference: 6SE6440-2UD38-8FB1
Category: Drives / VFD
Evidence checked: 2026-09-12

System role

This section explains what the product does and where it acts in the surrounding system.

Function: Converts three-phase AC input into controlled high-power motor output for industrial machinery.
System position: Sits between the incoming power supply and the motor in a variable-speed drive system.
Upstream / inputs: Receives the configured speed command and electrical power from the upstream drive circuit.
Downstream / outputs: Outputs controlled motor power and drive status to downstream machine control.
Limitations: Unknown: the installed project, wiring, firmware, operating duty, and current unit condition.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

The exact-reference product page identifies 6SE6440-2UD38-8FB1 as a Siemens MICROMASTER 440 without-filter inverter.
Confidence: high
- www.nexinstrument.com — retrieved 2026-09-12; medium confidence
- support.industry.siemens.com — retrieved 2026-09-12; high confidence
The exact-reference listing states 380-480 V three-phase input, 90 kW constant torque, 110 kW square-law torque, and IP20 protection.
Confidence: high
- www.nexinstrument.com — retrieved 2026-09-12; medium confidence
- support.industry.siemens.com — retrieved 2026-09-12; high confidence

Inferences

The drive occupies the high-power motor-control stage between the three-phase supply and an industrial machine motor.
Confidence: medium
Rationale: The exact-reference identity and documented electrical role place the unit in the stated drive-system position.
- www.nexinstrument.com — retrieved 2026-09-12; medium confidence
- support.industry.siemens.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: the installed project, wiring, firmware, operating duty, and current unit condition.
Confidence: low
Missing evidence: An installed-system inspection and compatibility record were not available in the individual lookup.

System position diagram

Incoming power flows through 6SE6440-2UD38-8FB1 to a machine motor. — The drive converts incoming power into controlled motor output in the machine system.

View Mermaid source

flowchart LR\n  supply[Incoming power] --> drive[6SE6440-2UD38-8FB1]\n  drive --> motor[Machine motor]

View diagram labels

Nodes: Incoming power; 6SE6440-2UD38-8FB1 drive; Machine motor
Edges: Power enters drive; Controlled motor output

Next action

Use this reference when the documented drive family, electrical interface, and motor duty match the project.

Unknown: confirm the installed project, wiring, firmware, operating duty, and unit condition before integration.

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