Siemens MICROMASTER 430 VFD 18.5kW 380-480V 3-Phase Pump Fan Drive 6SE6430-2UD31-8DB0

Siemens MICROMASTER 430 VFD 18.5kW – D-Size Drive for Large Pump and Fan Applications

The Siemens MICROMASTER 430, model 6SE6430-2UD31-8DB0, delivers 18.5kW output power with 380-480V 3-phase input. This unfiltered variable torque drive represents the entry point to the D-size chassis, featuring larger dimensions and higher current capacity than the C-size models. The DB0 suffix indicates an unfiltered version with enhanced thermal management for continuous heavy-duty operation.

Key Specifications:
- Output Power: 18.5 kW (variable torque / square-law torque)
- Input Voltage: 380-480V AC 3-phase, +10/-10%, 47-63Hz
- Rated Output Current: 38A
- Output Frequency: 0-650Hz
- Overload Capacity: 110% for 60s, 140% for 3s
- Protection Class: IP20
- Operating Temperature: -10°C to +40°C
- Dimensions (HxWxD): 520mm × 275mm × 245mm
- Weight: Approx. 15kg
- Filter: Without built-in filter
- Frame Size: D

Typical Applications:
- Large industrial pumps (10-25 HP)
- High-capacity exhaust fans
- HVAC central plant systems
- Large cooling tower fans
- Industrial ventilation systems
- Wastewater treatment pumps

Key Features:
- Built-in PID controller
- Linear V/f control with Flux Current Control (FCC)
- 6 digital inputs, 2 analog inputs, 2 analog outputs, 3 relay outputs
- 15 fixed frequencies, 4 skip frequencies
- BiCo technology for flexible I/O configuration
- Integrated RS-485 Modbus RTU interface
- Optional PROFIBUS-DP module
- Flying restart function
- DC injection braking

Pump & Fan Special Features:
- Multi-pump switching (staging up to 3 additional pumps)
- Bypass logic control
- Manual/Auto mode with switchover capability
- Dry well detection / belt break detection
- Energy consumption monitoring
- Sleep mode for idle operation
- Motor staging (control of additional drives via output relay)

Why D-Size Chassis?
The D-size chassis (520×275×245mm) is designed for higher power applications beyond 15kW. The larger enclosure provides enhanced thermal dissipation for continuous heavy-duty operation. All D-size models (18.5kW, 22kW, 30kW) share the same mounting dimensions, allowing straightforward power upgrades within the same cabinet footprint.

Selection Guide:
The 18.5kW model is the first power rating in the D-size chassis. Choose this model when your pump or fan motor is rated 18.5kW (25 HP) or when the 15kW C-size model is insufficient. For higher power, consider the 22kW or 30kW models within the same D-size family.

Important Notes:
- This product is discontinued. Available ONLY as a spare part
- DB0 suffix indicates unfiltered version with specific thermal characteristics
- A BOP or AOP is required for parameter changes
- SINAMICS G120 series is the recommended successor for new designs

FAQ:

Q1: What is the difference between DA0 and DB0 suffixes?
A: Both indicate unfiltered versions in the D-size chassis. The main difference is thermal performance and application suitability. DA0 and DB0 models share the same power ratings but may have different cooling configurations. The 6SE6430-2UD31-8DB0 uses the DB0 configuration.

Q2: What is the maximum cable length between drive and motor?
A: For shielded cable: up to 50 meters. For unshielded cable: up to 100 meters. For longer runs, an output reactor is recommended to prevent reflected wave damage.

Q3: Does this drive support PROFIBUS communication?
A: The standard version has RS-485 Modbus RTU. An optional PROFIBUS DP module (6SE6400-1PB00-0AA0) can be added for integration into PROFIBUS networks.

Q4: Can this be used for high starting torque applications?
A: As a variable torque drive, MM430 is optimized for pump and fan loads where starting torque requirements are moderate (typically 30-50% of rated torque). For high starting torque applications like screw compressors or positive displacement pumps, consider MM440 series.

Q5: What is the typical lifespan of this drive?
A: With proper installation and maintenance (clean environment, adequate cooling, stable power supply), MM430 drives typically operate reliably for 10-15 years. This 18.5kW model is available as a spare part to support existing installations.

📦 Spare Part – Limited Stock | Tech Support | Confirm availability
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