SIEMENS 6SE7021-3TB51-Z L43+G91 SIMOVERT MASTERDRIVES Motion Control | Replacement, Equivalent & Selection Guide
The SIEMENS 6SE7021-3TB51-Z (Options: L43 + G91) is a high-performance SIMOVERT MASTERDRIVES Motion Control Compact Unit engineered for demanding servo and vector control applications in industrial automation. This page provides full technical specifications, compatible replacement models, application guidance, and sourcing information to help engineers and procurement teams make confident decisions.
Technical Specifications
- Manufacturer: Siemens AG
- Series: SIMOVERT MASTERDRIVES MC (Motion Control)
- Order Number: 6SE7021-3TB51-Z
- Option Codes: L43 (Safe Stop) + G91 (PROFIBUS-DP)
- Drive Type: Compact Unit (Inverter)
- Control Mode: Motion Control (Servo / Vector)
- Output Power: 7.5 kW (10 HP) nominal
- Input Voltage: 3-phase AC 380–480 V ±10%
- Output Current: 21.3 A (rated)
- Frequency Range: 0–300 Hz
- Option L43: Safe Stop / Safety relay function (SIL 1 / Cat. 3)
- Option G91: PROFIBUS-DP communication module (CBP2)
- Cooling: Forced air cooling
- Protection Class: IP20
- Weight: approx. 5.5 kg
- Standards: CE, UL, cUL
Compatible Replacement & Equivalent Models
The following models are commonly evaluated as replacements or equivalents for the 6SE7021-3TB51-Z L43+G91. Always verify electrical and mechanical compatibility before substitution:
- Siemens SINAMICS S120 — modern successor platform, equivalent power class, enhanced motion control capabilities
- 6SE7021-3TB51 — base unit without L43/G91 options; requires separate PROFIBUS module (CBP2)
- 6SE7022-6TC51-Z — next power class (11 kW) in the same MASTERDRIVES MC series
- ABB ACS880-01-025A-3 — cross-brand vector/servo equivalent (~11 kW, 380–480 V)
- Yaskawa SGDV-7R6A01A — servo drive equivalent for motion-critical applications
- Mitsubishi MR-J4-70A — servo amplifier alternative for similar power range
Note: Cross-brand replacements require re-engineering of control wiring, parameters, and safety circuits. Contact our technical team for guidance.
Why Choose the Original Model
- Proven reliability in continuous industrial duty cycles
- Integrated PROFIBUS-DP (G91) for seamless integration with Siemens SIMATIC S7 PLCs
- Safe Stop function (L43) meets SIL 1 / Category 3 safety requirements without external relays
- Optimized for SIMOVERT ecosystem — direct parameter compatibility with existing MASTERDRIVES installations
- Reduced commissioning time when replacing like-for-like in existing systems
Typical Applications
- CNC machine tool spindle and feed axis control
- Packaging machinery with precise positioning requirements
- Printing and converting lines
- Textile and winding machines
- Conveyor systems with coordinated multi-axis motion
- Crane and hoist applications requiring safe stop
System Compatibility
- PLC: Siemens SIMATIC S7-300, S7-400, S7-1500 (via PROFIBUS-DP G91)
- HMI: SIMATIC OP/TP panels via PROFIBUS
- Engineering Software: STARTER, DriveMonitor, SIMATIC Manager
- Motor Types: Siemens 1FK / 1FT / 1PH series synchronous and induction motors
- Encoder Interface: HTL/TTL incremental, resolver (depending on option board)
Selection Guide
Use the following criteria to confirm this model is the right choice for your application:
- ✅ Power requirement: Motor rated at 7.5 kW / 10 HP
- ✅ Supply voltage: 3-phase 380–480 V AC
- ✅ Communication: PROFIBUS-DP fieldbus required (G91 option)
- ✅ Safety: Safe Stop / SIL 1 required (L43 option)
- ✅ Control mode: Servo or high-performance vector control
- ✅ Form factor: Compact unit (standalone, not booksize)
If your application requires a different power class, communication protocol, or safety level, contact us for a tailored recommendation.
Quality Assurance & Sourcing
- Source: Authorized distributors and verified surplus channels
- Inspection: Each unit undergoes visual inspection and functional verification before shipment
- Authenticity: Serial number and firmware version documented; counterfeit screening applied
- Warranty: 12-month warranty against manufacturing defects
- Condition: New, refurbished, or tested-used — clearly stated per listing
How to Order
- Confirm the full order number: 6SE7021-3TB51-Z L43+G91
- Specify required condition: New / Refurbished / Tested-Used
- Provide delivery destination and required lead time
- Contact us via email or phone for a formal quotation
- Submit purchase order — we accept T/T, PayPal, and trade terms (MOQ 1 pc)
Replacement & Compatibility FAQ
Q: Can the 6SE7021-3TB51-Z replace an older MASTERDRIVES VC unit?
A: The MC (Motion Control) variant uses a different control algorithm than the VC (Vector Control) series. Direct replacement is not recommended without parameter re-engineering.
Q: Is the PROFIBUS-DP module (G91) removable or field-upgradeable?
A: The G91 option is factory-installed. Field upgrade from a base unit is possible using the CBP2 communication board.
Q: What is the lead time for this model?
A: Typically 3–7 business days for in-stock units; 4–8 weeks for new factory orders. Contact us for current availability.
Q: Can this drive be used with non-Siemens motors?
A: Yes, with proper encoder and parameter configuration, though performance optimization is best achieved with Siemens 1FK/1FT motors.
© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
