Siemens 6SL3210-1KE21-7AF1 G120 Inverter Safety Drive for Pump Applications 16.5A 7.5kW

The Siemens 6SL3210-1KE21-7AF1 G120 Inverter Safety Drive is engineered for demanding pump applications, delivering precise speed control and robust safety features for optimal performance and operational integrity. With a rated current of 16.5A and a power output of 7.5kW, this drive offers exceptional energy efficiency and reliability. Its integrated safety functions, such as Safe Torque Off (STO), minimize risks in industrial environments, while advanced control algorithms ensure smooth acceleration and deceleration, crucial for pump longevity and process stability. The G120 platform is renowned for its flexibility and ease of integration, making the 6SL3210-1KE21-7AF1 a compelling choice for system integrators and plant managers seeking a high-performance, secure, and cost-effective variable speed drive solution.

Product Specifications

| Parameter                 | Specification                       |

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

| Manufacturer              | Siemens                             |

| Product Series            | SINAMICS G120                       |

| Model Number              | 6SL3210-1KE21-7AF1                  |

| Rated Current (Ie)        | 16.5 A                              |

| Rated Power (P)           | 7.5 kW (10 HP)                      |

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

| Output Frequency          | 0-599 Hz                            |

| Protection Class          | IP20                                |

| Dimensions (H x W x D)    | 307 x 140 x 174.5 mm                |

| Ambient Temperature Range | -20°C to +50°C                      |

| Safety Functions          | Safe Torque Off (STO)               |

Core Features & Market Positioning

The Siemens 6SL3210-1KE21-7AF1 G120 Inverter Safety Drive stands out in the competitive variable speed drive market due to its robust integration of safety features directly into the control architecture, a hallmark of the SINAMICS G120 series. This eliminates the need for external safety relays in many applications, simplifying system design and reducing overall costs. The drive's modular design, comprising a Control Unit (CU) and Power Module (PM), allows for tailored configurations to meet specific application demands, enhancing flexibility and future-proofing investments. Its advanced vector control capabilities ensure precise speed and torque regulation, which is paramount for the efficient and reliable operation of centrifugal and positive displacement pumps in various industrial sectors, from water treatment to chemical processing. This focus on integrated safety and application-specific performance positions the 6SL3210-1KE21-7AF1 as a premium solution for safety-critical and performance-intensive pumping duties.

Key Application Scenarios

This Siemens G120 inverter is ideally suited for a wide array of pump applications where precise flow control, energy savings, and operational safety are critical. In water and wastewater treatment facilities, it facilitates precise management of influent and effluent pumps, optimizing treatment processes and reducing energy consumption during varying demand cycles. For the oil and gas industry, it is employed in high-pressure pumping systems, where accurate pressure regulation and the integrated Safe Torque Off (STO) function enhance operational safety during maintenance or emergency shutdowns. Furthermore, in the chemical and petrochemical sectors, the drive’s ability to handle corrosive environments (when properly enclosed) and provide accurate dosing control makes it indispensable for chemical transfer pumps. Its capability to manage variable loads also makes it an excellent choice for building services, such as HVAC systems, to maintain consistent water pressure and temperature while minimizing energy use.

Practical System Integration Guidance

Integrating the Siemens 6SL3210-1KE21-7AF1 G120 drive into existing pump systems requires careful consideration of electrical connections and control logic. The power module and control unit are typically connected via a data cable, ensuring seamless communication. For STO functionality, dedicated safety input terminals on the control unit must be wired to the safety circuit. When wiring power connections, ensure compliance with local electrical codes and use appropriately sized conductors to handle the 16.5A current rating. Programming the drive for pump applications often involves configuring PID controllers for accurate speed adjustment based on pressure or flow feedback, and setting ramp-up/ramp-down times to prevent water hammer or system shock. Parameterization via the Basic Operator Panel (BOP) or the more advanced Intelligent Operator Panel (IOP), or through software tools like STARTER, allows for fine-tuning of motor parameters and application-specific settings.

Operation and Risk Mitigation

Operating the Siemens 6SL3210-1KE21-7AF1 G120 inverter necessitates adherence to safety protocols to mitigate potential risks. The Safe Torque Off (STO) function is a vital safety feature, preventing the motor from generating torque and ensuring it remains in a safe state, which is crucial during maintenance or emergency situations. Proper installation in a well-ventilated enclosure is recommended to maintain optimal operating temperatures and prevent overheating, which could lead to drive faults. Common troubleshooting may involve addressing motor overload faults (e.g., F30001) by checking motor parameters, load conditions, or ambient temperature, or responding to communication faults (e.g., F70001) by verifying cable connections between the control unit and power module. Regular diagnostics and parameter checks through the operator panel or software are essential for proactive risk management and ensuring continuous, safe operation of pump systems.

Scalability & Long-Term Value

The SINAMICS G120 platform, including the 6SL3210-1KE21-7AF1 model, offers significant scalability and long-term value for industrial pump applications. Its modular design allows for easy upgrades or replacements of individual components, such as swapping a power module for one with a higher or lower current rating if application requirements change, without needing to replace the entire drive. This flexibility ensures that the system can adapt to evolving production needs. Furthermore, the G120 series integrates seamlessly with Siemens' broader automation portfolio, including PLCs (like SIMATIC S7) and industrial communication networks (PROFINET, PROFIBUS), enabling sophisticated process control and data acquisition. This connectivity facilitates integration into Industrial Internet of Things (IIoT) strategies, enabling remote monitoring, predictive maintenance, and enhanced operational efficiency, thereby maximizing the return on investment over the drive's lifespan.

Frequently Asked Questions (FAQs)

What is the primary function of the Siemens 6SL3210-1KE21-7AF1 G120 inverter?

This drive's core function is variable speed control for pump motors, enabling precise flow and pressure management. It also integrates crucial safety features like STO for enhanced operational security.

How does the STO function on this Siemens drive enhance safety?

STO prevents the motor from generating torque by disconnecting power at the power stage. This ensures a safe state for maintenance and emergency stops.

What are the typical applications for the 6SL3210-1KE21-7AF1 G120 drive?

It excels in water/wastewater, oil/gas, and chemical processing for pumps needing precise flow control. It's also used in building services for HVAC systems.

Can this inverter be used with different types of pumps?

Yes, it is highly versatile and suitable for centrifugal, positive displacement, and submersible pumps. Its advanced control adapts well to various pump characteristics.

What are the key technical specifications of this drive?

It handles 7.5kW (10 HP) with a 16.5A rating, designed for 3-phase 380-480V AC input, offering output frequencies up to 599 Hz.

What kind of safety certifications does this drive typically carry?

Siemens drives often comply with relevant international safety standards like SIL 2 or PL d for STO functionality. Always check specific product documentation.

How is the Siemens G120 drive programmed for pump control?

Programming is done via its operator panel or software like STARTER, configuring parameters for PID control, ramp times, and motor data.

What is the protection rating (IP rating) of this specific model?

The Siemens 6SL3210-1KE21-7AF1 G120 drive generally has an IP20 rating, meaning it's protected against solid objects larger than 12.5mm and offers no water protection.

What are the benefits of using a variable speed drive for pump applications?

VSDs significantly reduce energy consumption, provide precise process control, extend equipment life by reducing mechanical stress, and minimize noise pollution.

How does this drive contribute to IIoT integration?

Its communication capabilities (e.g., PROFINET) allow for data logging, remote monitoring, and integration into digital manufacturing platforms for predictive maintenance and optimization.