Tag: LENZE EVF8212-E

Description

The LENZE EVF8212-E​is a compact,versatile frequency inverter from Lenze’s 8200 vector series,designed for precise speed control of three-phase asynchronous motors.This 1.5 kW drive operates on a 230V three-phase supply and incorporates advanced sensorless vector control technology.It provides energy-efficient motor control with integrated safety functions and communication capabilities,making it ideal for a wide range of industrial applications requiring variable speed operation,from material handling to HVAC systems.

Application Scenarios

In a large warehouse distribution center,a network of conveyor belts previously operated with fixed-speed motors controlled by mechanical starters.This resulted in high inrush currents during startup,mechanical stress on gearboxes and belts,and excessive energy consumption during partial load operation.The facility engineer implemented a modernization project using LENZE EVF8212-E​drives on several key conveyor sections.The drives’soft-start functionality eliminated the damaging current spikes,while the sensorless vector control provided smooth acceleration and precise speed regulation.The built-in energy optimization feature automatically adjusted motor flux based on load,reducing energy consumption by 23%during normal operation.When a jam occurred on one conveyor,the drive’s torque limit detection immediately signaled the PLC via the integrated fieldbus interface,triggering an automated shutdown sequence.The maintenance team particularly appreciated the integrated Safe Torque Off(STO)function,which provided a Category 3/PLd safety solution without requiring external safety contactors,simplifying the safety circuit design and reducing installation costs by approximately 15%.

Parameter

Here are the key technical specifications for the LENZE EVF8212-E​drive:

Main Parameters

Value/Description

Product Model​

EVF8212-E

Manufacturer​

Lenze

Product Category​

Frequency Inverter/AC Drive

Rated Power​

1.5 kW(2.0 HP)

Output Current​

4.0 A

Input Voltage​

3-phase,200-240V AC(±10%),47-63 Hz

Output Voltage​

3-phase,0-Input voltage

Control Methods​

V/f control,Sensorless Vector Control(SLVC)

Communication​

Integrated RS485(Modbus RTU),Optional plug-in fieldbus cards

Safety Function​

Safe Torque Off(STO)according to EN 61800-5-2,SIL 2/PL d

Protection Class​

IP20(requires enclosure for dust/water protection)

Ambient Temperature​

-10°C to+50°C(with derating above 40°C)

Key Features​

Built-in brake chopper,PID controller,3 programmable digital inputs,2 programmable digital outputs,1 analog input,1 analog output

Technical Principles and Innovative Values

The LENZE EVF8212-E​represents a sophisticated yet cost-effective approach to variable speed control,balancing performance with ease of use through several key innovations.

Innovation Point 1:Advanced Sensorless Vector Control Implementation

Unlike basic V/f drives,the EVF8212-E​employs sophisticated sensorless vector control algorithms.This technology enables independent control of motor flux and torque-producing current components without requiring a feedback encoder.The drive continuously calculates the motor’s magnetic field position based on mathematical models and current measurements,delivering up to 200%starting torque and maintaining full torque at near-zero speeds.This results in superior dynamic response and precise speed holding(±0.2%of set speed)for applications like winding machines or mixers where load conditions vary dramatically.

Innovation Point 2:Integrated Safety and Intelligence Platform

The drive incorporates STO(Safe Torque Off)as a standard safety feature,meeting SIL 2/PL d requirements.This dual-channel safety input directly disables the power semiconductors,preventing unintended motor operation.From an intelligence perspective,the EVF8212-E​features a built-in programmable controller(PLC functionality)with Lenze’s FAST(Foundation for Application Software Technology)environment.This allows developers to implement local control sequences,bypassing the central PLC for simple tasks,reducing program complexity and scan times in the main controller.

Innovation Point 3:Modular Connectivity and Application Flexibility

The drive features a modular slot for plug-in communication cards,enabling seamless integration into virtually any industrial network including PROFIBUS DP,PROFINET,EtherNet/IP,CANopen,and others.This future-proofs the investment,allowing users to select the appropriate network interface for their specific application without changing the drive hardware.The combination of multiple programmable digital/analog I/O and this network flexibility makes the EVF8212-E​adaptable to countless applications from simple speed control to complex positioning tasks.

Innovation Point 4:Eco-Mode and Dynamic Energy Optimization

The drive includes an intelligent energy-saving algorithm that automatically optimizes motor magnetization based on actual load requirements.In applications with variable torque characteristics(like centrifugal pumps and fans),this”Eco Mode”can reduce energy consumption by 5-25%compared to conventional V/f operation.The drive continuously monitors load conditions and adjusts voltage-frequency characteristics in real-time,ensuring optimal efficiency across the entire operating range without compromising performance.

Application Cases and Industry Value

Case Study 1:Textile Manufacturing Tension Control System

A textile manufacturer producing synthetic fibers needed precise tension control across multiple winding stations.Previously,they used DC drives with mechanical tensioning systems that required constant manual adjustment and produced inconsistent product quality.They retrofitted the system with standard three-phase motors controlled by LENZE EVF8212-E​drives.Utilizing the drives’sensorless vector control and built-in PID controller,they created a closed-loop tension control system using a tension transducer as feedback.The fast torque response(within milliseconds)of the EVF8212-E​maintained consistent tension despite rapid speed changes and material variations.The built-in PLC functionality handled the local winding sequence,reducing the programming burden on the main controller.The result was a 40%reduction in material waste due to breaks and inconsistent winding,a 15%increase in production speed,and significantly reduced maintenance compared to the previous DC drive system.

Case Study 2:Commercial Building HVAC Retrofit

A 20-story office building with a constant volume HVAC system was experiencing high energy costs and uneven temperature distribution.The building management system was upgraded with variable frequency drives on all major fan and pump motors.The LENZE EVF8212-E​was selected for the smaller circulating pumps(1.5kW)due to its compact size and built-in PID functionality.The drives were configured to maintain constant pressure in the hydronic system by adjusting pump speed based on differential pressure sensor feedback.The”Eco Mode”provided additional energy savings during partial load conditions,which represented 80%of operating hours.The facility manager reported a 32%reduction in HVAC electrical consumption in the first year,with a return on investment achieved in under 18 months.The quiet operation and reduced mechanical stress also lowered maintenance costs and increased equipment lifespan.

Related Product Combination Solutions

A complete motor control solution using the EVF8212-E​typically involves these complementary components:

Braking Resistor(e.g.,LENZE MRE Series):​Required for applications with high inertia loads or frequent deceleration(e.g.,elevators,centrifuges)to dissipate regenerative energy and prevent drive overvoltage faults.

EMC Filter(e.g.,LENZE EMF-…):​Limits electromagnetic interference to meet CE/UL requirements,essential for installations in facilities with sensitive electronic equipment.

Fieldbus Communication Module(e.g.,LENZE FDV-…​for PROFINET):​Plug-in card that enables seamless integration of the EVF8212-E​into higher-level automation networks like PROFIBUS,PROFINET,or EtherNet/IP.

Operator Panel(e.g.,LENZE EVD-8200):​Provides local control,parameter adjustment,and status display without requiring a PC with configuration software.

Line Reactor/du/dt Filter:​Protects motor insulation from voltage spikes caused by long cable runs between the drive and motor,extending motor life in applications with cables longer than 50 meters.

External Safety Relay Module:​For applications requiring safety levels beyond STO(like Safe Stop 1 or Safe Limited Speed),external safety modules can interface with the drive’s STO inputs to create more complex safety functions.

Installation,Maintenance,and Full-Cycle Support

Proper installation begins with verifying the electrical supply matches the drive’s 200-240V three-phase input rating.The LENZE EVF8212-E​should be mounted vertically on a flat,non-flammable surface with adequate clearance for ventilation(typically 100mm above and below).Correct grounding is essential—use the designated PE terminal with a conductor matching the phase wire cross-section.Motor connections should use shielded cables grounded at both ends for optimal EMC performance.The STO safety circuit must be implemented according to the machine’s risk assessment and relevant standards,with both channels independently monitored.Initial commissioning is streamlined using Lenze’s easySoft or FAST software,featuring application wizards that automatically configure parameters for common applications like pumps,fans,or conveyors.

Routine maintenance primarily involves ensuring clean cooling fins and checking terminal tightness during scheduled shutdowns.The drive stores detailed fault history with timestamps,which can be accessed via the keypad or software to diagnose issues.Common alarms like overcurrent or overtemperature typically point to mechanical problems(binding loads,failed bearings)or inadequate cooling.The modular design allows for straightforward component replacement if needed.Parameters can be easily backed up to a file or memory card,ensuring quick restoration after drive replacement.For firmware updates,Lenze provides clear procedures that typically enhance functionality or resolve known issues.

We provide comprehensive support for the LENZE EVF8212-E​throughout its lifecycle.Our drives are sourced from authorized channels and undergo rigorous testing before shipment.We offer detailed application assistance,helping you select the correct braking resistors,filters,and communication options for your specific needs.Our technical team can provide configuration files and assist with troubleshooting complex applications.We maintain access to firmware updates,documentation,and repair services,ensuring your drive investment is protected for the long term.For system integrators,we offer volume pricing and customized pre-configuration services to reduce your commissioning time.

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