Siemens MICROMASTER 440 VFD 18.5kW 200-240V 3-Phase 6SE6440-2UC31-8EA1

Siemens MICROMASTER 440 VFD 18.5kW – E-Size Vector Drive for High-Power Applications

The Siemens MICROMASTER 440, model 6SE6440-2UC31-8EA1, delivers 18.5kW constant torque output power with 200-240V 3-phase input, with square-law torque rating extending to 22kW for pump and fan applications[reference:71]. This E-size unfiltered drive represents the transition to the larger E-size chassis, offering increased current capacity (68A constant torque output) and enhanced thermal management for continuous heavy-duty operation.

The E-size chassis (650×275×245mm) provides substantial improvements over D-size: larger heat sinks for higher power dissipation, bigger bus bars for increased current handling, and additional space for input and output filtering components when required. This form factor is designed for applications where uptime is critical—the robust construction ensures reliable operation even in demanding industrial environments with vibration and temperature variations.

At this power level, applications typically include large industrial pumps in water treatment facilities requiring 24/7 operation, heavy-duty fans in manufacturing plants with variable air volume demands, and extruders in continuous production lines where process consistency directly affects product quality. The drive's sensorless vector control maintains stable torque output despite load variations, while the 150% overload capacity provides margin for short-term surges.

Key Specifications:
- Output Power: 18.5 kW (constant torque) / 25 HP
- Square-Law Torque Power: 22 kW (pumps, fans, centrifugal loads)[reference:72]
- Input Voltage: 200-240V AC 3-phase, +10/-10%, 47-63Hz[reference:73]
- Input Current: 62 A (constant torque)[reference:74]
- Rated Output Current: 68 A (constant torque)[reference:75]
- Output Frequency: 0-600 Hz (typical) to 650 Hz (maximum)
- Overload Capacity: 150% for 60 s, 200% for 3 s[reference:76]
- Protection Class: IP20
- Operating Temperature: -10°C to +50°C
- Dimensions (H×W×D): 650mm × 275mm × 245mm[reference:77]
- Weight: Approx. 28-35 kg (depending on configuration)
- Filter: Without built-in filter
- Frame Size: E

Typical Applications:
- Large industrial centrifugal pumps
- High-capacity exhaust and supply fans
- Heavy-duty material handling conveyors
- Industrial extruders and compounding lines
- Large mixers and agitators
- Centrifuges and separators
- Compressors (screw and reciprocating)

Key Features:
- Sensorless vector control delivers 100% torque down to 0.5 Hz without encoder
- Built-in braking chopper for dynamic braking (external resistor required)
- BiCo technology for flexible I/O signal configuration
- 6 digital inputs, 2 analog inputs, 2 analog outputs, 3 relay outputs
- Integrated Modbus RTU interface (RS-485)
- Flying restart for capturing spinning motors
- DC injection braking for zero-speed holding
- PID controller for closed-loop process control
- 4 skip frequencies for mechanical resonance avoidance
- Adjustable PWM frequency for audible noise control

E-Size Chassis Characteristics:
The E-size chassis represents a significant physical scale increase over D-size, designed for power levels where efficient heat dissipation becomes critical. The 650mm height provides increased surface area for cooling fins, while the 275mm width accommodates larger power components. Terminal blocks are sized for heavy-gauge conductors and power cables common at this current level. For control cabinet design, E-size drives require careful planning for vertical clearance (allow 100mm above and below) and adequate cabinet ventilation.

Important Notes:
- This product is discontinued (PM410). Available ONLY as a spare part
- Requires 3-phase input only; 68A output requires substantial supply capacity
- For new installations, SINAMICS G120 series is the recommended successor
- External braking resistor may be required for applications with rapid deceleration
- BOP or AOP required for parameter configuration beyond factory defaults

FAQ:

Q1: What input current should I plan for when installing this drive?
A: At 18.5kW constant torque, input current is approximately 62A. For square-law torque applications (22kW), input current will be proportionally higher. Factor this into your supply transformer sizing and distribution panel capacity.

Q2: What is the physical size difference between E-size and D-size?
A: E-size (650×275×245mm) is approximately 130mm taller than D-size (520×275×245mm) while sharing the same width and depth. This allows for larger heat sinks and power components necessary for higher current handling.

Q3: Does this drive include a braking transistor?
A: Yes. The E-size models include a built-in braking chopper (braking transistor). An external braking resistor must be ordered separately for dynamic braking applications. For pump and fan applications without rapid deceleration requirements, a resistor may not be necessary.

Q4: What is the maximum motor cable length for this power level?
A: For output currents at this level, cable length recommendations are more conservative: unshielded cable up to 100 meters, shielded cable up to 50 meters. For longer runs, an output reactor (du/dt filter) is recommended to protect motor winding insulation.

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