6SE6440-2AD31-5DA1 MICROMASTER 440
The Siemens MICROMASTER 440 (MM440) is a high-performance general-purpose variable frequency drive (VFD) belonging to the MICROMASTER 4 series. The specific part number 6SE6440-2AD31-5DA1 is a 15 kW (18.5 kW overload) three-phase unit designed for 380–480 V AC input, suitable for demanding variable-speed drive applications. It is manufactured by Siemens and represents one of the most widely deployed drives in the MICROMASTER family.
The 6SE6440-2AD31-5DA1 features a built-in EMC filter and integrated braking chopper, enabling direct connection of an external braking resistor for fast deceleration. It supports multiple control modes including V/f control, flux current control (FCC), and closed-loop vector control with or without encoder feedback. The drive includes USS and PROFIBUS-ready communication capability (via optional module), a total of 6 digital inputs, 2 analog inputs, 3 relay outputs, and 2 analog outputs. It also incorporates comprehensive protection functions including overcurrent, overvoltage, undervoltage, overtemperature, and ground fault protection, with a pulse-width modulation switching frequency adjustable up to 16 kHz.
The MICROMASTER 440 is widely used in industrial applications such as pumps, fans, compressors, conveyors, mixers, extruders, and centrifuges across industries including water treatment, food and beverage, chemical processing, and general manufacturing. The 15 kW power rating and robust protection features make the 6SE6440-2AD31-5DA1 suitable for both constant-torque and variable-torque loads, and its compact design allows installation in standard control cabinets with minimal footprint.
Technical Specifications
| Power Rating | 15 kW |
|---|---|
| Input Voltage | 380–480 V AC (3-phase) |
| Input Frequency | 47–63 Hz |
| Output Current (Continuous) | 34 A |
| Output Frequency Range | 0–650 Hz |
| Control Type | V/f, Flux Current Control (FCC), Sensorless Vector, Closed-Loop Vector |
| Switching Frequency | 2–16 kHz (adjustable) |
| EMC Filter | Built-in Class A |
| Braking Resistor Support | Yes (integrated braking chopper) |
| Digital Inputs | 6 x programmable digital inputs |
| Analog Inputs | 2 x analog inputs (0–10 V / 0–20 mA) |
| Relay Outputs | 3 x relay outputs |
| Analog Outputs | 2 x analog outputs (0–20 mA) |
| Communication Interface | USS (RS-485); PROFIBUS DP via optional module |
| Operating Temperature | -10 °C to +50 °C |
| Protection Rating | IP20 |
| Certifications | CE, UL, cUL, C-Tick |
| Series/Product Family | MICROMASTER 440 |
Common Fault Codes
- F0001
- Overcurrent: Drive output current has exceeded the maximum permissible value.
Check for short circuit or ground fault on motor cables. Verify motor parameters are correctly set. Reduce acceleration ramp time or check for mechanical overload. - F0002
- Overvoltage: DC link voltage has exceeded the permissible limit, typically caused by regenerative energy during deceleration.
Increase deceleration ramp time (P1121). Connect an external braking resistor or enable the Vdc-max controller (P1240). - F0003
- Undervoltage: DC link voltage has fallen below the minimum permissible level.
Check input supply voltage for dips or interruptions. Verify that the supply voltage matches the drive rating. Check input fuses and contactor. - F0004
- Drive overtemperature: The drive heatsink temperature has exceeded the permissible limit.
Check that ambient temperature is within specification. Verify cooling fan operation. Clean heatsink fins of dust and debris. Reduce switching frequency or output current. - F0011
- Motor overtemperature: Motor thermal model has detected an overtemperature condition.
Check motor loading and duty cycle. Verify motor thermal model parameters (P0611, P0612). Check motor cooling and ambient temperature. Consider adding a PTC thermistor. - F0041
- Motor parameter identification fault: Automatic motor data identification (P1910) has failed.
Verify motor nameplate data entered in parameters P0304–P0311 is correct. Ensure motor is connected and free to rotate if required. Repeat the identification routine. - F0051
- Parameter EEPROM fault: Error detected when reading or writing parameters to non-volatile memory.
Perform a factory reset (P0970 = 1) and re-enter all parameters. If fault persists, the drive control board may require replacement. - F0060
- Asic timeout: Internal communication fault between the drive's processor and power section.
Power cycle the drive. If the fault recurs, check for electromagnetic interference sources near the drive. Drive may require service or control board replacement.
Frequently Asked Questions
What is the output power and current rating of the 6SE6440-2AD31-5DA1?
This drive is rated at 15 kW with a continuous output current of 34 A for a 380–480 V three-phase supply. It can handle a 18.5 kW overload rating for high-demand applications.
Does the 6SE6440-2AD31-5DA1 include a built-in EMC filter and braking chopper?
Yes, this variant includes an integrated Class A EMC filter and a built-in braking chopper. An external braking resistor can be connected directly to the drive's braking resistor terminals.
What communication protocols does the MICROMASTER 440 support?
The drive natively supports USS protocol over RS-485. PROFIBUS DP communication is available via an optional PROFIBUS module (e.g., 6SE6400-1PB00-0AA0) that plugs into the drive's option slot.
Can the MICROMASTER 440 operate in closed-loop vector control mode?
Yes, the MM440 supports closed-loop vector control with encoder feedback via an optional encoder module. It also supports sensorless vector control without an encoder for applications where a tachometer is not practical.
What protection features are built into the 6SE6440-2AD31-5DA1?
The drive includes protection against overcurrent, overvoltage, undervoltage, drive and motor overtemperature, ground faults, and phase loss. PTC/KTY thermistor input for direct motor temperature monitoring is also supported.
Troubleshooting
Drive displays F0001 (overcurrent) immediately on start or during acceleration
Check motor cable insulation resistance to ground and between phases using a megohmmeter. Verify motor winding resistance. Check that motor parameters (P0304–P0311) match the motor nameplate data.
Repair or replace damaged motor cables. Correct motor parameter settings. If the motor is healthy, increase the acceleration ramp time (P1120) to reduce inrush current during start-up.
Drive trips on F0002 (overvoltage) during deceleration
Monitor DC link voltage during deceleration using the drive's diagnostic parameters (r0026). Confirm whether the braking chopper and resistor are active and correctly sized.
Increase the deceleration ramp time (P1121). Verify the braking resistor is connected and within specification. Enable the Vdc-max controller (P1240 = 1) to automatically extend deceleration when DC link voltage is high.
Drive powers up but motor does not rotate when a run command is issued
Check digital input status via parameter r0722 to confirm the run command is being received. Verify setpoint source (P1000) and command source (P0700) are configured correctly. Check for any active faults or alarms.
Correct the command source and setpoint source parameters. Ensure the enable signal is present on the digital inputs. Confirm the minimum frequency (P1080) and ramp times are set appropriately.
Drive fan runs but heatsink overtemperature fault (F0004) is triggered
Measure ambient temperature inside the cabinet. Check heatsink temperature via parameter r0026. Inspect the cooling fan for correct rotation direction and airflow. Check heatsink fins for dust blockage.
Clean the heatsink fins. Ensure adequate ventilation clearances above and below the drive (minimum 100 mm). Reduce the switching frequency (P1800) to lower internal losses. If the fan is faulty, replace it.
PROFIBUS communication is not established between the drive and PLC
Verify the PROFIBUS option module is correctly seated in the drive option slot. Check the PROFIBUS address set on the module matches the address configured in the PLC hardware configuration. Inspect cable termination resistors at both ends of the PROFIBUS segment.
Reseat the PROFIBUS module and set the correct node address. Ensure termination resistors are enabled only at the two physical ends of the bus. Verify the GSD file used in the PLC project matches the installed module firmware version.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|