Siemens MICROMASTER 420 VFD 7.5kW 380-480V 3-Phase 6SE6420-2UD27-5CA1

Siemens MICROMASTER 420 VFD 7.5kW – Heavy-Duty Drive for Demanding Applications

The Siemens MICROMASTER 420, model 6SE6420-2UD27-5CA1, delivers 7.5kW output power with 380-480V 3-phase input. This unfiltered drive is engineered for demanding industrial applications requiring reliable, continuous operation under heavy loads.

Key Specifications:
- Output Power: 7.5kW (constant torque)
- Input Voltage: 380-480V AC 3-phase, 50/60Hz
- Rated Output Current: 19A - 22A
- 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: 5.5kg

Typical Applications:
- Heavy industrial conveyors
- Large centrifugal pumps
- Industrial compressors (screw type)
- Extruders and mixers
- Large fans and blowers
- Centrifuges and decanters

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)
- Wide input voltage tolerance: +10%/-10%

Why This Model?
The 7.5kW model is designed for heavy-duty applications where the 5.5kW model reaches its limit. With output current capacity up to 22A (compared to 15.6A for the 5.5kW model), this drive can handle larger motors and more demanding loads.

In a manufacturing facility retrofit, installing this drive on a 7.5kW compressor reduced starting current from 180A (across-the-line) to just 45A (with VFD control), eliminating voltage sags on the facility power network and extending motor life.

The drive's 150% overload capability for 60 seconds provides ample margin for starting high-inertia loads such as centrifuges and large fans.

Selection Guide:
Choose 7.5kW when your motor is rated 7.5kW or when you need additional headroom above 5.5kW. For constant torque applications, match drive rating to motor rating. For variable torque applications, this drive can often handle up to 11kW centrifugal pumps or fans due to the square-law torque curve.

Important Notes:
- This is an "unfiltered" version. External EMC filters available as accessories.
- A BOP or 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: Can this drive handle a 10 HP (7.5kW) motor with high starting torque?
A: Yes. The 150% overload capacity for 60 seconds provides sufficient starting torque for most high-inertia loads, including conveyors starting under load and centrifugal pumps.

Q2: What is the difference between constant torque and variable torque ratings?
A: For constant torque (conveyors, positive displacement pumps), the drive is rated 7.5kW continuous. For variable torque (centrifugal pumps, fans), the square-law torque curve allows operation at higher power with the same current rating.

Q3: Does this drive include a braking transistor?
A: Yes. The MICROMASTER 420 series includes a built-in braking transistor on C-size frames (7.5kW and above). An external braking resistor is required for dynamic braking applications.

Q4: What size external braking resistor is recommended?
A: Minimum resistance 20 ohms, minimum power rating 500W continuous, 5000W peak (for 3 seconds). Consult Siemens documentation for exact specifications based on your application duty cycle.

Q5: Can I parallel multiple drives for higher power?
A: No. MICROMASTER 420 does not support parallel operation. For higher power requirements (above 11kW at 380V), consider the MICROMASTER 430 or SINAMICS G120 series.

📦 In Stock | Tech Support | Volume Discounts
Contact us for pricing and availability.
  

FAqS