EVS9321-EI Lenze 9300-Series 0.37 kW Intelligent Servo PLC

Product Overview

The EVS9321-EI (EVS9321-EI) is a high-precision intelligent servo controller from the Lenze 9300-Series, specifically engineered to combine high-performance drive technology with integrated PLC functionality. Delivering a rated power of 0.37 kW, this unit is an essential component for decentralized automation tasks that require complex motion sequences and localized logic processing. In B2B industrial environments—such as precision pharmaceutical labeling, semiconductor handling, and small-scale food packaging systems—the EVS9321-EI acts as a standalone controller, reducing the processing load on the central PLC. Its "EI" designation signifies its enhanced intelligence, allowing it to execute PLC-based control programs directly within the drive. Although the 9300-Series has reached its phase-out stage, this German-engineered servo PLC remains a vital solution for maintaining high-density automated systems where space-saving integration and millisecond-accurate positioning are mandatory.

Technical Configuration

The EVS9321-EI architecture is built for high-performance motion control, featuring a compact 7.80 cm wide chassis with an IP20 degree of protection, optimized for tight vertical mounting in control cabinets. The "Servo PLC" hardware integrates a powerful microprocessor that supports IEC 61131-3 compliant programming, enabling the drive to manage its own I/O and motion profiles independently. The power stage is designed for high dynamic response, supporting 3-phase mains connections and providing stabilized current to permanent magnet synchronous motors. The unit features integrated System Bus (CAN) communication for rapid axis synchronization and supports various feedback interfaces, including resolvers and high-resolution SinCos encoders. Its 3.50 kg build includes forced-air cooling and robust electronics designed to handle rapid acceleration and deceleration cycles without thermal degradation.

Technical Specifications

Technical FAQs

What is the primary advantage of the "Servo PLC" version (EI) over a standard 9300 Servo Drive?

The EVS9321-EI eliminates the need for an external PLC for localized tasks. It can process its own digital/analog signals and execute complex logic, which reduces the bus load on the main controller and improves the overall response time of the individual axis.

Can the EVS9321-EI be used for high-precision positioning?

Yes. Due to its high-speed internal processing and support for high-resolution feedback systems, this 0.37 kW unit is perfectly suited for precise electronic gearing, positioning, and synchronized motion tasks in multi-axis systems.

Is the internal PLC program protected during a power loss?

Yes. The PLC program and essential drive parameters are stored in non-volatile memory. For time-sensitive logic or data logging, an external 24 VDC auxiliary supply is recommended to keep the control electronics active even when the mains power is removed.

How do I replace a faulty EVS9321-EI in an existing system?

Since this is a Servo PLC, a direct replacement requires the original program file (PLC project) to be uploaded to the new unit. This is typically done via Lenze Global Drive Control (GDC) or Drive PLC Developer Studio software using the System Bus interface.

Engineering & Installation Guide

For the EVS9321-EI, vertical mounting is mandatory to ensure the chimney effect for heat dissipation is effective; maintain at least 100 mm of clearance above and below the unit. Given its role as a Servo PLC, ensure that control wiring for digital I/O and the System Bus is kept separate from high-voltage motor cables to prevent electromagnetic interference from disrupting the internal logic. All feedback and communication cables must be shielded, with the shield grounded at the drive's EMC plate using 360-degree clamps. Before operation, verify that the 24 VDC control voltage is stable and that the grounding of the control cabinet backplane is consistent, as the high-speed electronics in the 9300-Series are sensitive to voltage transients and ground loops.