LENZE EVF8212-E

Description

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Product Overview and Description

The LENZE EVF8212-E is a robust and versatile decentralized frequency inverter from Lenze’s renowned EVF 8200 series. This device is a fully-featured variable frequency drive (VFD) designed for mounting directly on or near the motor, integrating seamlessly into modern, distributed machine control architectures. The primary function of the LENZE EVF8212-E is to provide precise speed and torque control for standard three-phase asynchronous motors, converting a fixed voltage and frequency from the mains supply into a variable output to meet the demands of the application. Its decentralized design eliminates the need for a central control cabinet, reducing wiring costs, saving space, and increasing system flexibility. The “-E” suffix typically indicates a specific feature set, such as an enhanced brake chopper or an upgraded communication interface. The integration of the LENZE EVF8212-E into a machine network, via its embedded fieldbus interface, allows for direct control and monitoring from a central PLC, making it a key component in smart, modular machinery.

Product Parameters and Specifications

• Product Type: Decentralized Frequency Inverter / Variable Speed Drive

• Manufacturer Part Number (MPN): EVF8212-E

• Brand: Lenze

• Series: EVF 8200 serie

• Rated Power: 12 kW (derived from model number “8212”).

• Input Voltage: 3-phase, typically 380-480V AC, 50/60 Hz.

• Output Current: Specific maximum output current corresponding to the 12 kW rating.

• Control Technology: Advanced vector control (open-loop and closed-loop) for high dynamic performance and starting torque.

• Integrated Functions:

  • PLC Functionality: Includes an integrated motion task controller (FAST application software) for standalone sequencing.

  • Safety: Integrated Safe Torque Off (STO) safety function (SIL 3/PL e per EN 61800-5-2).

  • Brake Chopper: Integrated dynamic brake chopper for controlling deceleration of high-inertia loads.

• Communication Interfaces: Embedded fieldbus interface (e.g., PROFINET, EtherCAT, or Ethernet/IP – exact type depends on ordering code) for seamless network integration.

• Protection Class: High ingress protection rating, typically IP66 / IP67, for direct mounting in harsh environments without an additional enclosure.

• Cooling: Designed for convection cooling or mounting on a heatsink surface.

• Programming/Configuration: Configured via Lenze’s easyStarter or Lenze Engineering software tools.

Key Advantages and Features

The key advantage of the LENZE EVF8212-E is its combination of high power (12 kW) with a compact, decentralized, and ruggedized design. The integrated brake chopper is a significant feature, allowing for controlled braking of motors without the need for an external resistor in many applications, which simplifies installation and reduces cost. Its integrated safety function (STO) facilitates compliance with machinery safety standards without additional hardware. The built-in “FAST” application controller allows the drive to execute local logic, making simple machines or axes independent from the central PLC. The high IP rating ensures reliable operation in environments with dust, moisture, or washdown procedures. The direct fieldbus integration enables fast, deterministic communication for precise speed setpoint control and comprehensive diagnostic feedback. The overall design of the EVF8212-E emphasizes ease of use, reliability, and application-oriented functionality.

Application Scenarios and Use Cases

The LENZE EVF8212-E is ideal for demanding applications in material handling, packaging, and intralogistics. It is commonly used to control the drive motors of conveyor systems in distribution centers, where its decentralized mounting reduces cabinet size and its network connectivity allows for easy speed synchronization. In packaging machinery, such as fillers, cartoners, and palletizers, it provides precise speed control for various sections. For lift and hoist applications, its integrated brake control and safety functions are critical. In the food & beverage industry, its high IP rating makes it suitable for conveyor drives that require frequent cleaning. It is also well-suited for pump and fan control in building management or industrial processes where robust, standalone control is needed.

Comparison with Competing Products

The LENZE EVF8212-E competes directly with other decentralized drives in the same power range, such as the SEW Eurodrive MOVIMOT series (e.g., MDV..), Siemens SINAMICS G120D, Danfoss iC7-Micro, and ABB ACS880-07D. Compared to cabinet-mounted drives, it offers the clear advantage of space savings and reduced wiring. Against other decentralized drives, Lenze differentiates itself with its strong focus on integrated application intelligence (the FAST controller) and seamless integration within the Lenze system ecosystem (including controllers and I/O). The inclusion of a standard brake chopper at this power level is a competitive feature not always found as standard in other brands. The choice often comes down to preferred network protocol, regional support, and the specific value of the integrated controller for the application.

Selection Guidelines and Important Notes

Selection Advice:

1. Motor Matching: Ensure the LENZE EVF8212-E’s output current rating is equal to or greater than the full load current of the 12 kW motor it will control. Consider service factor and overload requirements.

2. Network Selection: Specify the correct fieldbus protocol variant (PROFINET, EtherCAT, etc.) that matches the machine’s main control network.

3. Thermal Management: Verify the installation provides adequate heat dissipation. For high ambient temperatures or heavy cycling, derating may be necessary, or forced cooling might be required.

4. Braking Energy: For applications with frequent deceleration of high-inertia loads, calculate the braking energy to confirm the integrated chopper is sufficient, or if an external brake resistor is still needed.

5. Safety Integration: Plan the wiring for the Safe Torque Off (STO) function according to the machine’s safety circuit design.

Important Precautions:

• Correct Mounting Surface: If mounted on a heatsink/backplate, ensure the surface is flat, clean, and has the correct thermal conductivity. Apply the specified thermal paste and torque the mounting bolts as instructed.

• EMC Compliance: To meet electromagnetic compatibility standards, use shielded motor cables, proper line filters (if not integrated), and correct grounding techniques as outlined in the manual.

• Parameter Backup: Always save a complete parameter set after commissioning using Lenze software. This file is essential for troubleshooting or drive replacement.

• DC Bus Charge: The DC bus capacitors remain charged for a period after power is removed. Wait the specified time or check for safe discharge before working on the unit.

• Environment: Do not exceed the specified IP rating’s limitations (e.g., do not submerge an IP67-rated unit unless so certified).

• Software Dependency: Advanced configuration and leveraging the FAST controller require Lenze’s Engineering software suite. Ensure access to the correct version.