Siemens 6SE6440-2UD22-2BA1 MICROMASTER 440 Frequency Inverter
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Product Information
The Siemens 6SE6440-2UD22-2BA1 is an unfiltered 2.2 kW AC frequency inverter engineered for high-performance variable speed motor control within the MICROMASTER 440 family. Operating from a three-phase supply voltage of 380 V to 480 V AC (±10%) at 47 Hz to 63 Hz, this drive provides a rated output current of 5.9 A and supports advanced speed and torque regulation for industrial machinery. Housed in an IP20 FSB frame size measuring 149 mm wide, 202 mm high, and 172 mm deep, the unit features Sensorless Vector Control (SLVC), Closed-Loop Vector Control (VC), and V/f control profiles with an overload capability of 150% for 60 seconds and 200% for 3 seconds.
System connectivity includes 6 digital inputs, 3 relay outputs, 2 analog inputs, and 2 analog outputs, along with an integrated PTC/KTY motor temperature sensor interface. An onboard RS-485 serial interface supports the USS protocol, while optional fieldbus modules enable integration into PROFIBUS DP, DeviceNet, or CANopen networks. Commissioning a replacement unit requires transferring application-specific motor parameters and control settings via an Advanced Operator Panel (AOP) clone or PC tools such as Siemens STARTER or DriveMonitor, as a spare drive will not operate machinery on factory settings alone. ABC Industrial Parts can assist maintenance teams with parameter extraction and spare unit preparation to streamline commissioning.
Basic drive operation is shown on the Status Display Panel (SDP) dual LED readout, while detailed status monitoring is accessed using optional BOP or AOP keypads, or through online diagnostic parameters r0000 to r0010. Routine troubleshooting should focus on line supply voltage, terminal control wiring, motor thermal connections, and network address settings. When internal power board or control circuit failures occur, field repairs are generally unfeasible, making a fully tested replacement unit or exchange service through ABC Industrial Parts the most efficient path back to production.
Technical Specifications
| Manufacturer | Siemens |
| Part Number | 6SE6440-2UD22-2BA1 |
| Model / Type | MICROMASTER 440 |
| Product Family | MICROMASTER |
| Component Type | Frequency Inverter |
| Supply Voltage | 380 - 480 V AC (±10%) |
| Line Frequency | 47 - 63 Hz |
| Rated Power | 2.2 kW |
| Rated Input Current | 7.5 A |
| Rated Output Current | 5.9 A |
| Overload Capacity | 150% for 60s, 200% for 3s |
| Control Mode | Sensorless Vector Control (SLVC), Closed-Loop Vector Control (VC), V/f Control |
| Power Factor | 0.95 |
| Efficiency | 96% |
| Digital Inputs | 6 |
| Relay Outputs | 3 |
| Analog Inputs | 2 |
| Analog Outputs | 2 |
| Onboard Interface | RS-485 (USS Protocol) |
| Frame Size | FSB |
| Degree of Protection | IP20 |
| Dimensions (W x H x D) | 149 mm x 202 mm x 172 mm |
| Net Weight | 3.3 kg |
| Operating Temperature Range | -10 to +50 °C |
Programming and Configuration
Programming the Siemens 6SE6440-2UD22-2BA1 frequency inverter is performed through Siemens commissioning software tools such as STARTER or DriveMonitor, or directly via detachable operator keypads including the Basic Operator Panel (BOP) and Advanced Operator Panel (AOP). These interfaces enable full access to the internal parameter tree to adjust motor data, control modes (SLVC, VC, V/f), acceleration and deceleration ramps, terminal assignments, and monitoring limits.
For rapid drive replacement without a PC, the Advanced Operator Panel (AOP) supports a parameter cloning feature. A complete parameter set can be uploaded from an existing drive into the AOP memory and subsequently downloaded into the replacement 6SE6440-2UD22-2BA1 unit. Alternatively, project archives managed in STARTER can be downloaded over the serial RS-485 connection to ensure the replacement drive matches the exact machine requirements.
Communication and System Integration
The 6SE6440-2UD22-2BA1 inverter comes equipped with an integrated RS-485 serial communication port operating the Siemens USS protocol. This native interface facilitates direct connection to host controllers, programmable logic controllers, or supervisory industrial PCs for parameter configuration, control command transmission, and operational state reading.
To accommodate complex industrial network architecture, the MICROMASTER 440 platform supports optional plug-in fieldbus modules. Adding these optional modules expands the drive's communication options to PROFIBUS DP, DeviceNet, or CANopen networks, allowing seamless integration into multi-node automated control systems.
Diagnostics and Status Indication
Visual status monitoring on the 6SE6440-2UD22-2BA1 is handled via the front-mounted Status Display Panel (SDP), which utilizes a dual LED readout to signal basic operational states. When enhanced visual diagnostics are required, attaching a BOP or AOP panel provides numerical display of dynamic values, active alarms, and fault codes.
System diagnostic parameters r0000 through r0010 provide live monitoring of operating variables such as output frequency, motor current, DC link voltage, and drive temperature. Connecting the inverter to a PC running STARTER or DriveMonitor allows technicians to monitor real-time operating curves, examine fault history registers, and perform active online diagnostics.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| SDP (Status Display Panel) | Dual LED readout | Provides basic operational drive state signals |
Replacement and Spare Part Considerations
When installing a replacement 6SE6440-2UD22-2BA1 drive, ensure the mounting location matches the FSB frame dimensions (149 mm W x 202 mm H x 172 mm D) and that cabinet environmental conditions align with the IP20 enclosure rating. Because this specific part number is an unfiltered drive variant, existing external EMC filters must be maintained to comply with installation standards.
Before placing a replacement unit into operation, application parameters must be loaded into the drive, as default factory settings will not match machine control logic. Parameters can be copied using an AOP keypad or restored from a software backup. While Siemens recommends the SINAMICS G120 and G120C series as modern migration paths for legacy MICROMASTER units, a direct like-for-like 6SE6440-2UD22-2BA1 replacement eliminates the need for cabinet rewiring or PLC program modification.
Frequently Asked Questions
Which software tools are used to configure the Siemens 6SE6440-2UD22-2BA1?
The drive is configured using Siemens STARTER or DriveMonitor software over an RS-485 connection, or manually via a BOP (Basic Operator Panel) or AOP (Advanced Operator Panel).
Can I transfer parameters to a replacement drive without using a PC?
Yes, using the Advanced Operator Panel (AOP), you can upload and store the parameter set from the existing drive and download it directly into the replacement 6SE6440-2UD22-2BA1 unit.
What are the input voltage and power ratings for this inverter?
The 6SE6440-2UD22-2BA1 operates on a three-phase input of 380 V to 480 V AC (±10%) at 47 to 63 Hz, with a rated motor power output of 2.2 kW and an output current of 5.9 A.
Does the 6SE6440-2UD22-2BA1 drive include an integrated EMC filter?
No, this specific part number is an unfiltered frequency inverter variant. External EMC filtering must be used if required by the installation design.
What fieldbus communication options are supported?
The drive includes an onboard RS-485 port supporting the USS protocol. Optional communication modules can be added to support PROFIBUS DP, DeviceNet, and CANopen.
What is the modern migration path for this legacy MICROMASTER 440 drive?
Siemens recommends migrating to the SINAMICS G120 or G120C drive series for modern system upgrades.
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Specific firmware and hardware versions
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