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                                                                                                                                                                                    MicroMaster 440 frequency inverter 380-480V, PROFIBUS-DP supported frequency converter, 5.5kW 7.5kW industrial inverter
                      

Product Name:	Frequency Converter Inverter	Rated Power:	200-240V（0.12kW - 45kW），380-480V（0.37kW - 200kW）
Level Of Protection:	IP20	Pakage:	Original Pakage
Warranty:	Original Factory Warranty	Shipping Term:	International Express（DHL/FEDEX/TNT/UPS/ARAMEX）/ Sea Freight / Air Freight / International Special Line

Product Name:	Frequency Converter Inverter
Rated Power:	200-240V（0.12kW - 45kW），380-480V（0.37kW - 200kW）
Level Of Protection:	IP20
Pakage:	Original Pakage
Warranty:	Original Factory Warranty
Shipping Term:	International Express（DHL/FEDEX/TNT/UPS/ARAMEX）/ Sea Freight / Air Freight / International Special Line

MicroMaster 440 Series 6SE6440 Frequency Converter Inverter 380-480V, 5.5kW/7.5kW, PROFIBUS-DP Supported

MicroMaster 440 Series Frequency Converter

The MicroMaster 440 family represents a high-performance general-purpose AC frequency converter engineered for demanding industrial applications. With precise speed control, stable operation, and flexible adaptability, it has become the preferred choice for industrial users worldwide. Compatible with both constant torque and variable torque (quadratic law) loads, it covers diverse needs from general machinery to process industries. The compact design and comprehensive protection functions ensure reliable operation even in harsh working conditions.

Technical Specifications

Power Input Parameters

Parameter	Details
Input Voltage	200-240V±10% (1-phase/3-phase); 380-480V±10% (3-phase); 500-600V±10% (3-phase)
Input Frequency	47-63Hz

Core Output Parameters

Parameter	Details
Output Frequency Range	0-650Hz
Output Power Range	200-240V 1-phase: Constant torque 0.12-3kW, Variable torque 0.12-4kW; 200-240V 3-phase: Both constant torque and variable torque 0.12-45kW; 380-480V 3-phase: Constant torque 0.37-75kW, Variable torque 0.55-90kW
Frequency Resolution	0.01Hz for digital setting and serial communication; 10-bit precision for analog setting
PWM Frequency	2-16kHz (adjustable in 2kHz steps)

Control Performance Parameters

Parameter	Details
Control Modes	Sensorless Vector Control, Closed-Loop Vector Control, Closed-Loop Torque Control; Linear V/F Control, Quadratic V/F Control, Programmable Multi-point V/F Control
Overload Capacity	200% rated load current for 3 seconds; 150% rated load current for 60 seconds
Special Control Functions	Built-in PID controller (auto-tuning); 15 programmable fixed frequencies, 4 programmable skip frequencies; Supports master/slave control and automatic restart

I/O Interface Parameters

Parameter	Details
Digital Inputs	6 channels, freely programmable, PNP/NPN selectable
Analog Inputs	2 channels, compatible with 0-10V, 0-20mA, -10 to +10V signals
Analog Outputs	2 channels, programmable to output signals corresponding to operating parameters
Relay Outputs	3 channels, resistive load 30V DC/5A, inductive load 250V AC/2A

Protection Parameters

Parameter	Details
Protection Types	Overvoltage/Undervoltage Protection, Inverter & Motor Overheating Protection, Earth Fault Protection, Short-Circuit Protection, Locked Rotor Protection, Stall Prevention; Parameter interlock (PIN code protected)
Motor Overload Factor	Adjustable via parameter P0640 (percentage configurable)

Physical & Environmental Parameters

Parameter	Details
Protection Class	IP20 (suitable for cabinet mounting)
Operating Temperature	-10℃ - 50℃ (operating); -40℃ - 70℃ (storage)
Mounting Method	Wall-mounted, compact design (dimensions vary by power rating; e.g., 55kW model without filter: 850mm350mm320mm)

Communication Parameters

Parameter	Details
Standard Interface	Integrated RS485 communication port
Optional Modules	PROFIBUS-DP, DeviceNet communication modules, seamless integration with Siemens S7 series PLCs

Model Specifications

200-240V (1-phase/3-phase) Models

Model	Rated Power	Key Specifications
6SE6440-2UC11-2AA1	0.12kW	3-phase or single-phase input, protection class IP20
6SE6440-2UC12-5AA1	0.25kW	3-phase or single-phase input, suitable for general light-load machinery
6SE6440-2UC13-7AA1	0.37kW	3-phase or single-phase input, widely used in small pumps and fans
6SE6440-2UC15-5AA1	0.55kW	3-phase or single-phase input, stable operation under variable frequency conditions
6SE6440-2UC17-5AA1	0.75kW	3-phase or single-phase input, with good dynamic response performance
6SE6440-2UC21-1BA1	1.1kW	3-phase or single-phase input, suitable for medium-power small mechanical equipment
6SE6440-2UC21-5BA1	1.5kW	3-phase or single-phase input, applicable to small-scale transmission systems
6SE6440-2UC22-2BA1	2.2kW	3-phase or single-phase input, strong overload capacity
6SE6440-2UC23-0CA1	3kW	3-phase or single-phase input, adaptable to complex load changes
6SE6440-2UC24-0CA1	4kW	3-phase or single-phase input, suitable for general industrial occasions
6SE6440-2UC25-5CA1	5.5kW	3-phase or single-phase input, matching with constant torque loads
6SE6440-2UC27-5DA1	7.5kW	3-phase or single-phase input, applicable to equipment requiring high torque at low speed
6SE6440-2UC31-1DA1	11kW	3-phase or single-phase input, compatible with PROFIBUS-DP communication expansion
6SE6440-2UC31-5DA1	15kW	3-phase or single-phase input, suitable for medium-sized fan and pump equipment
6SE6440-2UC31-8EA1	18.5kW	3-phase or single-phase input, with reliable over-current and over-temperature protection
6SE6440-2UC32-2EA1	22kW	3-phase or single-phase input, suitable for heavy-duty transmission scenarios
6SE6440-2UC33-0FA1	30kW	3-phase or single-phase input, meeting the needs of large-flow water treatment equipment
6SE6440-2UC33-7FA1	37kW	3-phase or single-phase input, with excellent vector control performance
6SE6440-2UC34-5FA1	45kW	3-phase or single-phase input, suitable for high-power general machinery

380-480V (3-phase) Models

Model	Rated Power	Key Specifications
6SE6440-2UD13-7AA1	0.37kW	3-phase input, suitable for small-power constant torque equipment
6SE6440-2UD15-5AA1	0.55kW	3-phase input, reliable operation in industrial environments such as workshops
6SE6440-2UD17-5AA1	0.75kW	3-phase input, applicable to small-scale conveyor belts and compressors
6SE6440-2UD21-1AA1	1.1kW	3-phase input, with good low-speed torque output performance
6SE6440-2UD21-5AA1	1.5kW	3-phase input, compatible with multiple communication protocols for easy integration into industrial control systems
6SE6440-2UD22-2BA1	2.2kW	3-phase input, strong overload capacity, suitable for medium-load mechanical transmission
6SE6440-2UD23-0BA1	3kW	3-phase input, compact structure, easy to install in cabinets
6SE6440-2UD24-0BA1	4kW	3-phase input, suitable for general-purpose machinery with variable load requirements
6SE6440-2UD25-5CA1	5.5kW	3-phase input, constant torque output, applicable to process industrial equipment
6SE6440-2UD27-5CA1	7.5kW	3-phase input, square-law torque output can be upgraded, suitable for fans and pumps
6SE6440-2UD31-1CA1	11kW	3-phase input, stable operation under high-frequency conditions, suitable for high-speed machinery
6SE6440-2UD31-5DA1	15kW	3-phase input, good dynamic response, applicable to heavy-duty transmission equipment
6SE6440-2UD31-8DA1	18.5kW	3-phase input, with multiple protection functions to ensure safe operation
6SE6440-2UD32-2DA1	22kW	3-phase input, suitable for large-scale conveyor systems and compressors
6SE6440-2UD33-0EA1	30kW	3-phase input, applicable to medium-sized process industrial equipment such as water treatment devices
6SE6440-2UD33-7EA1	37kW	3-phase input, strong load-bearing capacity, suitable for high-power pumps and fans
6SE6440-2UD34-5FA1	45kW	IP20 protection class, 150% overload for 60 seconds, 200% overload for 3 seconds
6SE6440-2UD35-5FA1	55kW	3-phase input, no filter, suitable for high-power constant torque industrial scenarios
6SE6440-2UD41-3GA1	132kW	3-phase input, large power output, applicable to large-scale industrial compressors and fans
6SE6440-2UD42-0GA1	200kW	3-phase input, high-power industrial grade, suitable for large-scale transmission and process systems

Industry Applications

General Machinery Manufacturing: Conveyors, packaging machines, printing machines, CNC machine tool spindle/feed systems
Process Industry: Chemical reactor agitation, pharmaceutical material handling, food processing line speed control
Water Treatment: Frequency control for water pumps (constant pressure water supply, sewage treatment aeration pumps)
HVAC: Speed control for large fans and cooling tower fans
Metallurgy & Mining: Speed control for small conveyors and feeders

Frequently Asked Questions

Installation & Wiring

Q1: The inverter is installed in a control cabinet. Why does it trigger an overheating fault (F0004) as soon as it starts?

A1: The most likely cause is insufficient heat dissipation:

Check ventilation space: MM440 requires at least 10cm of clearance above and below—don't stack it with other heat-generating equipment
Verify the cooling fan: If the fan doesn't run during operation, it's faulty and needs replacement
Reduce PWM frequency: If the ambient temperature exceeds 50℃, either install a cooling fan in the cabinet or lower the inverter's PWM frequency (default is 4kHz; adjusting to 2kHz reduces heat generation)

Q2: I'm using a USB-to-RS232 cable to connect my computer to the inverter, but I can't connect to Starter software. What's wrong?

A2: This is the most common issue for overseas customers!

Replace the cable: Cheap USB-to-RS232 adapters are often incompatible with industrial equipment. Use an adapter with an FTDI chip for better stability
Check parameter settings: In the inverter, set P2010=6 (USS communication baud rate) and P2011=0 (address). Ensure the DIP switches on the connection kit are correctly set per the manual (Switch 1 ON, Switch 2 OFF)
Use a native serial port: Older computers with built-in serial ports are more reliable than USB adapters. For best results, use a PROFIBUS communication card—much more stable than USS communication

Q3: How to handle grounding during installation? I heard someone burned their inverter due to poor grounding.

A3: Grounding is critical!

Connect the inverter's PE (grounding terminal) to a dedicated grounding bar with a grounding resistance ≤4Ω
Use a ground wire with a cross-section at least equal to the inverter's input/output wires—never bundle it with power cables

A customer once burned multiple MM440 units in their Shanghai factory. The root cause was excessive grounding resistance, which prevented surge discharge during power grid fluctuations, damaging internal components. Adding a dedicated ground wire resolved the issue.

Operation & Troubleshooting

Q4: The inverter trips suddenly during operation, displaying F0002 (overvoltage). What's the cause?

A4: Overvoltage is usually related to too-fast deceleration or unstable grid voltage:

If tripping occurs during motor deceleration, increase the deceleration time (parameter P1121). For high-inertia loads like fans/pumps, rapid deceleration turns the motor into a generator, charging the inverter's DC bus and causing overvoltage. Install a braking resistor if necessary
If the grid voltage is too high (exceeding 480V), add an input reactor or set the inverter's input voltage parameter (P0210) to the actual grid voltage

Q5: The motor vibrates at startup, lacks torque, and can't even drive the rated load. How to fix this?

A5:

Verify motor parameters: Ensure P0307 (motor rated power) and P0305 (motor rated current) are correctly set. For example, entering 7.5kW motor parameters into a 5.5kW inverter will result in insufficient torque
Change control mode: For heavy-load startup, switch from V/F control to Sensorless Vector Control (set P0700=21) for significantly improved torque
Check cable length: If the motor cable exceeds 50m, increase the cable cross-section or install an output reactor

Q6: The input power contactor trips frequently, and the inverter displays F0003 (undervoltage). Is the inverter faulty?

A6: It's almost never the inverter! The issue is likely with the contactor:

Either the contactor coil is aging (insufficient suction, causing power loss during operation) or the control circuit voltage is unstable (triggering false tripping)

Try replacing the contactor or checking for loose wiring in the control circuit—many customers resolved the problem this way without needing to repair the inverter.

Q7: The inverter shuts down suddenly without error codes, but works normally after restart. What's happening?

A7:

Check grid voltage: Use a multimeter to measure the input voltage during operation—if it drops significantly below 380V, that's the cause
Verify auto-shutdown settings: Ensure P1070 (control source) is correctly configured, and check for loose external terminal connections (which can trigger false shutdowns)
Inspect braking resistor: For models with a built-in braking chopper, overheating of the braking resistor can cause temporary shutdowns—normal operation resumes after cooling

Maintenance & Compatibility

Q8: MM440 is discontinued. I can't find spare parts when it breaks down. What should I do?

A8: Although MM440 is discontinued, Siemens still provides spare parts support—common components like cooling fans, power modules, and communication modules are available. If the mainboard is faulty, repair costs are high. We recommend upgrading directly to the G120 series:

G120 is compatible with MM440 in terms of installation dimensions, wiring, and parameters (importable via Starter software), requiring no control cabinet modifications. Many customers have adopted this upgrade path

Q9: The inverter's fan noise has become increasingly loud after years of use. Does it need replacement?

A9: Yes, definitely! Fans are wear parts and typically last 3-5 years. Loud noise indicates worn bearings—failure to replace will soon lead to fan stoppage and inverter overheating trips.

Ensure model compatibility when replacing (e.g., FS-A and FS-B fans are not interchangeable)
Always disconnect power and wait for the DC bus voltage to drop to 0V before replacement—safety first!

If your issue isn't listed here (e.g., specific error codes like F0011/F0021, special load adaptation, or certification documentation for customs clearance), provide detailed scenarios for tailored solutions!

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MicroMaster 440 Series 6SE6440 Frequency Converter Inverter 380-480V, 5.5kW/7.5kW, PROFIBUS-DP Supported

MicroMaster 440 frequency inverter 380-480V

PROFIBUS-DP supported frequency converter

5.5kW 7.5kW industrial inverter

drive motion and control,

motion control drive,