Industrial AC Drive Solution – SIEMENS 6SE6420-2UD21-5AA1 | MICROMASTER 420
The SIEMENS 6SE6420-2UD21-5AA1 is a compact, high-performance AC variable frequency drive (VFD) from the MICROMASTER 420 series, engineered for precise motor speed control in demanding industrial environments. Rated at 1.5 kW with a 3-phase 200–240 V input, this drive delivers reliable, energy-efficient operation across a wide range of automation applications.
Where This Product Is Used
The MICROMASTER 420 6SE6420-2UD21-5AA1 is specified by engineers across multiple industries for motor control tasks that demand accuracy, robustness, and seamless integration:
- Pump & Fan Control — HVAC systems, water treatment plants, and cooling towers benefit from the drive’s built-in PID controller for flow regulation and energy savings.
- Conveyor & Material Handling — Precise speed ramp-up/ramp-down protects mechanical components and reduces belt wear in logistics and manufacturing lines.
- Textile & Packaging Machinery — Consistent torque delivery at low speeds ensures product quality in winding, unwinding, and cutting applications.
- Food & Beverage Processing — IP20-rated enclosure suits panel-mounted installations in hygienic production environments.
- Machine Tool Spindle Drives — Smooth acceleration curves and programmable skip frequencies eliminate resonance in CNC and milling equipment.
- Building Automation — BACnet/Modbus-compatible (via optional comms module) for integration into BMS and SCADA systems.
Technical Specifications
- Part Number: 6SE6420-2UD21-5AA1
- Series: SIEMENS MICROMASTER 420
- Output Power: 1.5 kW (2 HP)
- Input Voltage: 3-phase AC 200–240 V (±10%)
- Input Frequency: 47–63 Hz
- Output Frequency Range: 0–650 Hz
- Output Current: 8.0 A (rated)
- Overload Capacity: 150% for 60 s / 200% for 3 s
- Control Mode: V/f, Flux Current Control (FCC)
- Protection Class: IP20 (NEMA 1 with optional kit)
- Ambient Temperature: -10°C to +50°C (derating above 40°C)
- Braking: DC braking, compound braking
- Digital Inputs: 3 × programmable DI
- Analog Inputs: 1 × 0–10 V / 0–20 mA
- Serial Interface: RS-485 (USS protocol)
- Weight: 1.4 kg
- Country of Origin: Germany
- HS Code: 8504.40
Why Engineers Specify This Model
- Compact Footprint — Space-saving design fits standard control cabinets without derating in most ambient conditions.
- Plug-and-Play Parameterization — Quick commissioning via BOP (Basic Operator Panel) or STARTER software; factory defaults cover the majority of pump/fan applications out of the box.
- Robust EMC Performance — Integrated Class A filter meets EN 55011 for industrial environments; optional Class B filter available for stricter requirements.
- Wide Output Frequency Range — 0–650 Hz supports both standard 4-pole motors and high-speed spindle applications.
- Proven Reliability — MICROMASTER 420 has a multi-decade installed base across global manufacturing, with extensive spare-parts availability and Siemens technical support.
- Flexible Communication — Native USS/Modbus RTU; optional PROFIBUS, DeviceNet, and CANopen modules for seamless PLC integration.
Complete System Bill of Materials
For a fully operational drive installation, engineers typically specify the following alongside the 6SE6420-2UD21-5AA1:
- Operator Panel: SIEMENS 6SE6400-0BP00-0AA0 (BOP) or 6SE6400-0AP00-0AA0 (AOP)
- Line Filter (Class B): SIEMENS 6SE6420-2FC01-4AB0
- Braking Resistor: SIEMENS 6SE6400-4BD11-0AA0
- PROFIBUS Module: SIEMENS 6SE6400-1PB00-0AA0
- Motor Cable (shielded): 4-core, ≤ 50 m, cross-section per output current rating
- Input Fuses / MCB: Sized to 125% of drive input current per IEC 60364-4-43
- DIN Rail Mounting Kit: 6SE6400-0MD00-0AA0 (optional)
Compliance & Industry Standards
- CE Marked — Low Voltage Directive 2014/35/EU & EMC Directive 2014/30/EU
- UL Listed — UL 508C (Power Conversion Equipment)
- cUL Listed — CSA C22.2 No. 14
- RoHS Compliant — Directive 2011/65/EU
- EN 61800-3 (EMC requirements for variable-speed drive systems)
- EN 61800-5-1 (Safety requirements)
- IEC 60068-2 (Environmental testing)
Quality Assurance & Sourcing
At Konmask.com, every SIEMENS component undergoes a structured verification process before dispatch:
- Authenticity Check — Serial number and holographic label verified against SIEMENS product authentication database.
- Functional Pre-Test — Power-on test with motor load simulation; parameter defaults confirmed.
- Packaging Inspection — Original SIEMENS anti-static packaging retained; tamper-evident seals intact.
- Documentation — CE Declaration of Conformity, factory test report, and quick-start guide included.
- Traceability — Batch and date codes recorded for full supply-chain traceability.
We source directly from authorized SIEMENS distributors and bonded warehouses to eliminate counterfeit risk.
How to Source This Part
- Add to Cart — Click “Add to Cart” above; bulk pricing available for orders ≥ 5 units (contact us for a quote).
- Request a Quote — Email [email protected] with your project BOM for volume pricing and lead-time confirmation.
- Lead Time — In-stock units ship within 1–3 business days; ex-stock orders confirmed within 24 hours.
- Export & Customs — HS Code 8504.40 declared on all commercial invoices; EXW, FOB, and CIF Incoterms available.
- Payment — T/T, PayPal, and major credit cards accepted; LC available for orders above USD 10,000.
Application-Specific FAQ
Q: Can the 6SE6420-2UD21-5AA1 control a single-phase motor?
A: No. This drive requires a 3-phase input and outputs 3-phase power. For single-phase motor control, refer to the MICROMASTER 410 series.
Q: What is the maximum cable length between drive and motor?
A: SIEMENS recommends ≤ 50 m unshielded or ≤ 25 m shielded without output reactor. For longer runs, install a SIEMENS output reactor (dU/dt filter) to protect motor insulation.
Q: Is a line reactor required on the input?
A: Not mandatory for this power rating, but recommended when supply impedance is low (< 1%) or when multiple drives share a common bus to reduce harmonic distortion.
Q: Can I use this drive with a permanent magnet (PM) motor?
A: The MM420 supports V/f and FCC control modes only; it does not support sensorless vector control for PM motors. For PM motor applications, specify the SINAMICS G120 series.
Q: How do I reset the drive to factory defaults?
A: Set parameter P0010 = 30, then P0970 = 1. The drive will reset all parameters to factory defaults within approximately 10 seconds.
Q: Is this part compatible with SIMATIC S7 PLCs?
A: Yes. Via USS protocol over RS-485 natively, or via PROFIBUS DP with the optional 6SE6400-1PB00-0AA0 comms module. Full GSD file available from SIEMENS Industry Online Support.
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