Lenze EMB8253-E 8200-Series Brake Chopper Accessory

Product Overview

The EMB8253-E (EMB8253 E) is a high-performance brake chopper module designed for the Lenze 8200-series vector frequency inverters. As an essential accessory for motion control, the EMB8253-E manages regenerative energy produced by the motor during rapid deceleration or when handling overhauling loads. By diverting this excess energy into an external braking resistor, the module prevents "Overvoltage" (OU) faults on the inverter's DC bus, ensuring uninterrupted production cycles. Engineered with Lenze's signature German reliability, this 6kV-rated component is a vital safeguard for machinery requiring frequent starts, stops, or high-inertia movements, such as vertical conveyors, centrifuges, and high-speed packaging lines.

Technical Configuration

The EMB8253-E architecture is optimized for seamless integration with 8200-series vector drives. It monitors the DC bus voltage in real-time; when the voltage exceeds a predefined threshold (triggering at approximately 6kV insulation-rated parameters), the chopper activates to dissipate the energy. This module is designed with a "testable" framework, allowing production leaders to verify braking performance during commissioning. Its compact form factor (1.10 kg) allows for efficient installation alongside the drive within the control cabinet. As a part of the 8200-series "Phase-Out" lifecycle, the EMB8253-E remains a preferred choice for maintaining legacy systems, offering a robust and sustainable alternative to full-system overhauls.

Technical Specifications

Technical FAQs

What is the primary function of the EMB8253-E brake chopper?

The EMB8253-E acts as an electronic switch that monitors the DC bus of the frequency inverter. When the motor acts as a generator during braking, the chopper sends the excess power to a braking resistor to prevent the drive from tripping due to overvoltage.

Can this module be used without an external resistor?

No. The EMB8253-E is a controller (chopper) that directs the energy. You must connect a correctly sized external braking resistor to the module to actually dissipate the energy as heat.

Is the EMB8253-E compatible with the 8200 motec or 8200 vector series?

The EMB8253-E is primarily designed for the 8200 vector cabinet-mounted series. It is essential to verify the DC bus voltage levels and power ratings of your specific inverter to ensure a correct match.

Engineering & Installation Guide

• Wiring for Safety: Use high-temperature, shielded cables for the connection between the EMB8253-E and the external braking resistor, as the resistor can reach significant temperatures during intensive braking cycles. Keep these cables as short as possible to minimize electromagnetic interference (EMI).

• Heat Dissipation: Install the brake chopper vertically. Ensure the external braking resistor is mounted in a well-ventilated area, preferably outside the main control cabinet or in a section with dedicated airflow, to prevent the internal cabinet temperature from rising.

• DC Bus Connection: When connecting to the +UG and -UG terminals of the 8200-series inverter, ensure the polarity is correct. Incorrect wiring can lead to immediate damage to both the chopper module and the inverter's power stage.