Siemens 6SL3210-1KE21-7UB1 G120 Energy Saving Retrofit Drive Inverter 16.5A 7.5kW

The Siemens 6SL3210-1KE21-7UB1 G120 Energy Saving Retrofit Drive Inverter is a pivotal component for modernizing industrial machinery, offering substantial energy savings and enhanced operational efficiency. This 7.5 kW, 16.5A inverter is engineered for demanding applications, providing precise motor control and robust performance. Its core advantages lie in its advanced energy-saving capabilities, intelligent control algorithms, and seamless integration into existing Siemens automation ecosystems, making it an ideal retrofit solution for upgrading older drives.

Product Specifications

| Feature             | Specification                                      |

| :------------------ | :------------------------------------------------- |

| Product Number      | 6SL3210-1KE21-7UB1                                 |

| Series              | SINAMICS G120                                      |

| Power Rating        | 7.5 kW                                             |

| Current Rating      | 16.5 A                                             |

| Input Voltage       | 380-480 V AC, 3-phase                              |

| Output Voltage      | 0-480 V AC, 3-phase                                |

| Protection Class    | IP20 (Standard), IP21/IP23/IP55 with options     |

| Dimensions (H x W x D) | Varies by Control Unit and Power Module          |

| Operating Temperature | -20°C to +50°C (with derating above 40°C)          |

| Communication       | PROFIBUS, PROFINET, EtherNet/IP, Modbus TCP (optional) |

Core Features & Market Positioning

The SINAMICS G120 platform, including the 6SL3210-1KE21-7UB1, represents Siemens' commitment to intelligent drive technology. This inverter stands out with its modular design, allowing for flexible configuration of control units and power modules to match specific application requirements. Its advanced vector control and V/f control capabilities ensure optimal motor performance across a wide speed range, reducing energy consumption significantly compared to traditional fixed-speed motor applications. The inherent energy-saving features, coupled with its robust build quality and Siemens' reputation for reliability, position it as a leading choice for industrial automation projects focused on efficiency and longevity. The integration capabilities with other Siemens products, such as PLCs and HMIs, further solidify its market appeal for streamlined system design.

Key Application Scenarios

The Siemens 6SL3210-1KE21-7UB1 G120 drive inverter is exceptionally well-suited for a diverse range of industrial applications where energy efficiency and precise motor control are paramount. Common scenarios include its use in pumping and fan applications within HVAC systems, building automation, and water management, where variable speed operation dramatically cuts energy usage. It is also a robust solution for material handling systems, conveyor belts, and processing machinery in manufacturing, food and beverage production, and packaging lines. The inverter's ability to handle dynamic loads and provide smooth acceleration/deceleration makes it ideal for machine tools and printing presses. Furthermore, its suitability for retrofitting older equipment makes it a cost-effective upgrade for facilities looking to enhance the performance and energy footprint of existing infrastructure without a complete system overhaul.

Practical System Integration Guidance

Integrating the Siemens 6SL3210-1KE21-7UB1 into an industrial control system requires careful attention to wiring and parameterization. The power module connections for the motor and the incoming power supply must adhere strictly to the voltage and current ratings specified, ensuring proper grounding for safety. The control unit, which connects to the power module, facilitates communication and control logic. For initial setup, basic parameters such as motor data (nominal power, voltage, current, frequency, poles) must be entered into the control unit's memory. Commissioning typically involves performing an auto-tuning function to optimize the drive's performance for the connected motor, followed by configuring application-specific parameters like acceleration/deceleration ramps, speed setpoints, and control modes (e.g., V/f, vector control). Utilizing the Siemens STARTER commissioning software is highly recommended for efficient parameterization and diagnostics, providing a graphical interface for complex setups and troubleshooting. Ensuring proper ventilation and maintaining adequate clearance around the unit is crucial for thermal management and longevity.

Operation and Risk Mitigation

Operating the Siemens 6SL3210-1KE21-7UB1 involves managing motor speed and torque through various control interfaces, such as digital inputs, analog inputs, or fieldbus communication. User-friendly interfaces on the control unit or via commissioning software allow for easy monitoring of operational status, motor speed, current, and voltage. A critical aspect of operation is understanding and responding to fault codes. Common faults include overcurrent (F001), overvoltage (F002), undervoltage (F003), and motor thermal overload (F004). Prompt identification and rectification of these issues are vital to prevent equipment damage and minimize downtime. Risk mitigation involves ensuring all safety standards are met, including proper grounding, emergency stop integration, and adherence to lockout/tagout procedures during maintenance. Regular inspection of connections and environmental conditions, such as temperature and dust ingress, will also contribute to safe and reliable operation.

Scalability & Long-Term Value

The Siemens 6SL3210-1KE21-7UB1 G120 drive inverter offers significant scalability and long-term value, primarily due to its modular SINAMICS G120 platform. Users can easily upgrade or replace individual components, such as upgrading to a higher-rated power module or a different control unit with advanced communication capabilities, without needing to replace the entire drive. This inherent flexibility allows systems to adapt to evolving production demands or technological advancements. Furthermore, its compatibility with Siemens' broader automation portfolio, including TIA Portal software and various industrial communication networks like PROFINET and PROFIBUS, ensures seamless integration into existing or future Industrial Internet of Things (IIoT) environments. This facilitates enhanced data acquisition, remote monitoring, and predictive maintenance strategies, adding substantial long-term economic and operational benefits.

Frequently Asked Questions (FAQs)

1. What are the main benefits of using the Siemens 6SL3210-1KE21-7UB1 for retrofit projects?

This drive offers significant energy savings through intelligent speed control.

It provides precise motor performance, reducing wear and tear on machinery.

Upgrading simplifies maintenance and enhances system reliability over older drives.

2. How do I connect the Siemens 6SL3210-1KE21-7UB1 to a three-phase motor?

Connect motor terminals U, V, W to the power module outputs.

Ensure proper grounding of the motor and the drive for safety.

Refer to the specific wiring diagrams in the manual for your power module.

3. What are the typical power and current ratings for this specific Siemens G120 inverter?

The 6SL3210-1KE21-7UB1 is rated for 7.5 kW of motor power.

It can handle a maximum continuous current of 16.5 Amperes.

Always ensure your motor's requirements do not exceed these ratings.

4. Can the Siemens 6SL3210-1KE21-7UB1 be controlled remotely via a network?

Yes, optional communication modules enable network integration.

PROFINET, PROFIBUS, and EtherNet/IP are common supported protocols.

This allows for centralized control and monitoring in automated systems.

5. What is the recommended method for parameterizing the 6SL3210-1KE21-7UB1?

The STARTER commissioning software is the most efficient tool.

Basic parameterization can also be done directly on the control unit.

Ensure accurate motor data is entered for optimal performance.

6. What environmental conditions should I consider for installing this drive?

Avoid excessive dust, humidity, and corrosive atmospheres.

Operate within the specified temperature range of -20°C to +50°C.

Ensure adequate ventilation around the unit to prevent overheating.

7. How does the SINAMICS G120 platform contribute to the scalability of this inverter?

The modular design allows for easy component upgrades or replacements.

Control units and power modules can be swapped for different needs.

This flexibility supports future system expansions and modifications.

8. What are common fault codes and how can I address them?

F001 indicates overcurrent; check for motor or load issues.

F004 signifies motor thermal overload; allow cooling or check motor.

Consult the product manual for a comprehensive list and detailed solutions.

9. Does this inverter support energy-saving features beyond basic speed control?

Yes, it incorporates advanced control algorithms for efficiency.

The drive can optimize power factor and reduce reactive power.

Its design inherently minimizes energy losses during operation.

10. What is the typical lifespan and expected maintenance for the Siemens 6SL3210-1KE21-7UB1?

With proper installation and operation, the lifespan is extensive.

Routine checks include connections, ventilation, and environmental factors.

Preventive maintenance minimizes unexpected failures and downtime.