Siemens MICROMASTER 420 VFD 5.5kW 380-480V 3-Phase 6SE6420-2UD25-5CA1

Siemens MICROMASTER 420 VFD 5.5kW – Industrial AC Drive for Medium Power Applications

The Siemens MICROMASTER 420, model 6SE6420-2UD25-5CA1, delivers 5.5kW output power with 380-480V 3-phase input. This unfiltered drive is designed for reliable motor control in industrial applications, offering flexible speed control for a wide range of equipment.

Key Specifications:
- Output Power: 5.5kW (constant torque)
- Input Voltage: 380-480V AC 3-phase, 50/60Hz
- Rated Output Current: 13.2A - 15.6A
- Output Frequency: 0-650Hz
- Overload Capacity: 150% for 60 seconds
- Protection Class: IP20
- Operating Temperature: -10°C to +50°C
- Dimensions: 245mm × 185mm × 195mm
- Weight: 5.2kg - 5.5kg

Typical Applications:
- Industrial pumps and centrifugal fans
- Medium-capacity conveyors
- Small to medium compressors
- Mixing and blending equipment
- HVAC air handling units

Key Features:
- Microprocessor control with IGBT technology
- Flux Current Control (FCC) for dynamic motor response
- Fast Current Limitation (FCL) for trip-free operation
- Built-in DC injection braking
- 3 programmable digital inputs (PNP/NPN switchable)
- 1 analog input (0-10V, scalable)
- 1 programmable relay output
- RS-485 serial interface (Modbus RTU)

Why This Model?
The 5.5kW model is a popular choice for medium-power industrial applications, offering the right balance of power and affordability. In a recent pump station upgrade, this drive reduced energy consumption by 25% while maintaining constant discharge pressure through the built-in PID controller.

The larger C-size chassis (245mm height) provides excellent heat dissipation for continuous operation. At full load, the drive maintains safe operating temperatures even in ambient conditions up to 50°C.

Selection Guide:
Select 5.5kW when your motor is rated 5.5kW. For constant torque applications (conveyors, positive displacement pumps), match drive rating to motor rating. For variable torque (centrifugal pumps, fans), this drive can often handle up to 7.5kW motors due to the square-law torque curve.

Important Notes:
- This is an "unfiltered" version (no built-in EMC filter). External filters are available as accessories if required.
- A basic operator panel (BOP) or advanced operator panel (AOP) is required for parameter changes beyond factory defaults.
- This product has been discontinued by Siemens (PM410 - effective 01.10.2019). Available while stocks last.

FAQ:

Q1: Does this drive include a built-in EMC filter?
A: No. This is the unfiltered version (suffix 5CA1 indicates no filter). For applications requiring EMC compliance, external filters are available (order separately) or consider the filtered version.

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: Can I operate this drive without an operator panel?
A: Yes. The drive operates with factory default settings directly out of the box. However, to modify parameters (e.g., ramp times, motor data, PID settings), a BOP or AOP is required.

Q4: Is a braking resistor included?
A: No. The drive includes DC injection braking, but for dynamic braking applications, an external braking resistor can be connected (built-in braking transistor is present).

Q5: What communication protocols are supported?
A: Standard RS-485 Modbus RTU on terminals 14-15. Optional PROFIBUS module (6SE6400-1PB00-0AA0) and DeviceNet module (6SE6400-1DN00-0AA0) are available as accessories.

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