Variable Speed Drive Solution – SIEMENS 6SE7021-0EA51-Z | SIMOVERT MASTERDRIVES Series
Where This Product Is Used
The SIEMENS 6SE7021-0EA51-Z (with option codes C33+F01+G91) is a 4 kW SIMOVERT MASTERDRIVES Vector Control AC drive deployed across demanding industrial environments where precise motor speed and torque regulation are critical. Typical application scenarios include:
- Conveyor & Material Handling Systems — Controlled acceleration/deceleration on belt conveyors, roller tables, and palletizing lines in automotive and logistics facilities.
- Pump & Fan Drives — Energy-efficient flow regulation in HVAC systems, cooling towers, and process water circuits, replacing throttle valves with variable-speed control.
- Compressor Drives — Soft-start and speed-matched operation for screw and centrifugal compressors in petrochemical and pharmaceutical plants.
- Winding & Unwinding Machines — Tension-controlled winding in paper, film, and textile production lines, leveraging the drive’s torque-control capability.
- Machine Tool Spindle Drives — Coordinated multi-axis motion in CNC machining centers requiring dynamic speed response.
- Crane & Hoist Applications — Safe load handling with controlled braking via the integrated braking chopper (option G91).
- Test Bench & Dynamometer Systems — Regenerative load simulation enabled by the drive’s four-quadrant capability.
Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | SIEMENS AG |
| Part Number | 6SE7021-0EA51-Z |
| Option Codes | C33 + F01 + G91 |
| Series | SIMOVERT MASTERDRIVES (6SE70) |
| Rated Output Power | 4 kW |
| Drive Type | Vector Control (VC) AC Frequency Converter |
| Input Voltage | 3-phase AC 380–480 V ±10% |
| Input Frequency | 47–63 Hz |
| Output Frequency Range | 0–300 Hz (configurable) |
| Rated Output Current | ~10 A (frame size B) |
| Control Method | Sensorless vector / closed-loop vector (with encoder) |
| Option C33 | CBP2 PROFIBUS-DP communication board |
| Option F01 | External fan / forced-air cooling kit |
| Option G91 | Integrated braking chopper |
| Protection Class | IP20 (cabinet installation) |
| Cooling Method | Forced air (with F01 option) |
| Weight (approx.) | 900 g (drive unit) |
| Communication | PROFIBUS-DP (via C33 CBP2 board) |
| Standards | CE, UL, cUL |
Why Engineers Specify This Model
- PROFIBUS-DP Integration (C33) — The CBP2 board enables seamless integration into SIMATIC S7 / TIA Portal architectures and third-party PROFIBUS masters, eliminating the need for analog setpoint wiring and enabling full parameter access over the fieldbus.
- Built-in Braking Chopper (G91) — Eliminates the need for an external chopper unit in applications with high-inertia loads or frequent deceleration cycles, reducing panel space and BOM cost.
- Forced-Air Cooling (F01) — Extends the drive’s thermal headroom in high-ambient or high-duty-cycle environments, supporting continuous operation at rated current without derating.
- True Vector Control — Delivers high dynamic torque response at low speeds, making it suitable for hoists, winders, and servo-like positioning tasks without a full servo drive investment.
- Proven Platform Longevity — The SIMOVERT MASTERDRIVES 6SE70 platform has an extensive installed base globally, ensuring long-term spare parts availability and engineering familiarity.
- Compact Frame Size — 4 kW rating in a compact chassis simplifies panel layout in space-constrained control cabinets.
Complete System Bill of Materials
For a fully operational drive system, engineers typically specify the following complementary components:
- Input Line Filter — EMC Class C2/C3 line filter matched to 4 kW rating (e.g., SIEMENS 6SE7000-0LF84-0AA0 or equivalent)
- Input Line Reactor — 2–4% impedance AC line choke to reduce harmonic distortion and protect the drive’s rectifier
- Braking Resistor — External resistor matched to G91 chopper rating for high-duty braking cycles (size per application duty cycle)
- Output dV/dt Filter — Recommended for motor cable lengths >50 m to protect motor winding insulation
- PROFIBUS Cable & Connectors — Shielded PROFIBUS-DP cable (e.g., SIEMENS 6XV1830-0EH10) with 9-pin Sub-D connectors
- Encoder Feedback Module — SBP pulse encoder board for closed-loop vector control (if encoder feedback required)
- Main Contactor & Fuses — IEC-rated input contactor and semiconductor fuses per 6SE70 system manual
- Operator Panel (AOP/BOP) — SIEMENS OP1S or PMU panel for local parameter access and diagnostics
Compliance & Industry Standards
- CE Marking — Compliant with EU Low Voltage Directive (2014/35/EU) and EMC Directive (2014/30/EU)
- UL / cUL Listed — Recognized for North American installations per UL 508C (Power Conversion Equipment)
- IEC 61800-3 — Variable speed electrical power drive systems — EMC requirements
- IEC 61800-5-1 — Safety requirements for adjustable speed electrical power drive systems
- PROFIBUS-DP — IEC 61158 / EN 50170 compliant fieldbus communication
- RoHS Compliant — Restriction of Hazardous Substances per EU Directive 2011/65/EU
Quality Assurance & Sourcing
Konmask.com sources SIEMENS SIMOVERT MASTERDRIVES units through verified industrial distribution and authorized surplus channels. Every unit offered is subject to the following quality process:
- Visual Inspection — Enclosure integrity, connector condition, label legibility, and absence of physical damage assessed on receipt.
- Firmware & Parameter Verification — Factory default parameter sets confirmed where applicable; option board seating and identification verified.
- Functional Power-On Test — Units are energized and basic drive functionality confirmed prior to dispatch where test infrastructure permits.
- Authentic Traceability — Serial number and date code recorded; units sourced from traceable supply chains to minimize counterfeit risk.
- Secure Packaging — Anti-static packaging with foam cushioning and moisture-barrier bags for international shipment.
How to Source This Part
To place an order or request a quotation for the SIEMENS 6SE7021-0EA51-Z C33+F01+G91:
- Add to Cart — Click the purchase button on this page for immediate checkout.
- Request a Quote — Contact support@konmask.com for volume pricing, lead time confirmation, or alternative option-code configurations.
- Specify Your Requirements — Include your required quantity, delivery destination, and any application-specific questions (motor rating, duty cycle, fieldbus topology).
- Export & Customs — Konmask.com can provide commercial invoices, packing lists, and HS code documentation (HS 8504.40) to support customs clearance for international shipments.
- Lead Time — In-stock units typically ship within 3–5 business days. Contact us to confirm current stock status.
Application-Specific FAQ
Q: Can this drive operate without the PROFIBUS-DP option board (C33)?
A: Yes. The C33 CBP2 board is a plug-in option. The drive can be operated via its local PMU panel or analog/digital I/O terminals without PROFIBUS. The C33 board simply adds fieldbus capability.
Q: What braking resistor should I use with the G91 chopper?
A: The braking resistor value and power rating depend on your deceleration duty cycle. Refer to SIEMENS document A5E00297580 (SIMOVERT MASTERDRIVES Braking Resistor Selection Guide) or contact Konmask for application-specific sizing support.
Q: Is this drive compatible with SIMATIC S7-300/400 and TIA Portal?
A: Yes. With the C33 PROFIBUS-DP board, the drive integrates natively with S7-300, S7-400, and S7-1500 PLCs via PROFIBUS-DP. GSD files for the CBP2 board are available from SIEMENS Industry Online Support.
Q: Can I use this drive for a hoist or crane application?
A: Yes, with appropriate safety engineering. The G91 braking chopper supports controlled deceleration. For safety-critical hoist applications, a certified safety relay or STO (Safe Torque Off) module must be integrated per EN ISO 13849 / IEC 62061 requirements. Consult your safety engineer.
Q: What is the difference between 6SE7021-0EA51 and 6SE7021-0EB51?
A: The suffix digit before the frame code indicates the hardware revision or cooling variant. Verify the exact suffix against your panel design documentation. Konmask can assist in cross-referencing compatible variants.
Q: Do you offer warranty on this unit?
A: Yes. Konmask.com provides a standard 90-day functional warranty on all tested units. Extended warranty options are available — contact support@konmask.com for details.
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