EVF9321-EV Lenze 9300-Series 0.37 kW Vector Frequency Inverter

Product Overview

The EVF9321-EV (EVF9321-EV) is a high-precision vector-controlled frequency inverter from the Lenze 9300-Series, specifically engineered for applications requiring high dynamic performance and torque accuracy in a compact form factor. Delivering a rated power of 0.37 kW, this drive is optimized for small-scale precision machinery, including high-speed labeling systems, precise conveyor synchronization, and specialized laboratory automation. The EVF9321-EV utilizes advanced sensorless vector control to maintain constant torque even at low speeds, ensuring smooth operation in sophisticated motion sequences. As a specialized "EV" variant designed without integrated interference suppression measures, it offers a streamlined architecture for systems utilizing centralized cabinet filtering, making it a cost-effective and space-efficient choice for maintenance and legacy support in existing 9300-Series installations.

Technical Configuration

The EVF9321-EV architecture is built for 3-phase mains connection (3 x 400 / 480 V), providing reliable motor control for global voltage standards. Its slim design, with a width of only 7.60 cm, allows for high-density mounting in electrical cabinets where space is at a premium. The drive features a robust power stage capable of 150% overload for 60 seconds, which is essential for overcoming high breakaway torque in industrial loads. Being part of the 9300-Series, it supports modular expansion for fieldbus communication, including CAN, PROFIBUS, and Interbus. Although this series entered the phase-out stage in 2017, the drive's engineering focuses on thermal stability and long-term component durability, ensuring it remains a reliable solution for critical infrastructure maintenance.

Technical Specifications

Technical FAQs

Why does this specific model not include interference suppression?

The EVF9321-EV is designed for applications where central EMC filtering is already implemented at the cabinet level or where specific system-wide filtering is preferred. This reduces the footprint of the individual drive and allows for customized suppression strategies tailored to the entire machine's electrical environment.

Is this drive compatible with standard asynchronous motors?

Yes. The EVF9321-EV is specifically designed for 3-phase asynchronous motors. Its vector control mode provides superior performance compared to standard V/f drives, allowing for tighter speed regulation and improved energy efficiency under varying load conditions.

How can I configure parameters since the product is phased out?

The 9300-Series remains compatible with Lenze's Global Drive Control (GDC) software. Parameters can also be modified using the plug-in keypad (EMZ9371BC) or via the system bus (CAN) if integrated into a PLC network.

Engineering & Installation Guide

For the EVF9321-EV, proper thermal management is vital due to its high power density; ensure a minimum vertical clearance of 100 mm and avoid placing heat-sensitive components directly above the unit. Since this model lacks internal interference suppression, you must use a separate external mains filter and shielded motor cables to prevent electromagnetic noise from disrupting nearby sensors or communication lines. Ensure the shield of the motor cable is grounded with a 360-degree connection to the mounting plate. During installation, verify that the grounding conductor meets the minimum cross-section requirements for leakage currents, which are typical for high-frequency inverters. For commissioning, perform an automatic motor parameter identification (tuning) to align the vector model with the connected motor's characteristics, ensuring optimal torque response and preventing nuisance tripping.