{"product_id":"beckhoff-ej9576-ethercat-brake-chopper-plug-in-module","title":"BECKHOFF EJ9576 Module enfichable EtherCAT frein chopper","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eEJ9576 (EJ9576)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a high-efficiency brake chopper module designed for the Beckhoff EJ series plug-in I\/O system. Engineered for compact motion control applications, it protects the DC bus and power supply units from overvoltage caused by regenerative braking energy from motors. When a motor decelerates, it acts as a generator, feeding energy back into the system; the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eEJ9576\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003emonitors the bus voltage and, upon reaching a parameterizable threshold, shunts the excess energy into an external braking resistor. This module is essential for protecting sensitive electronic components and ensuring system stability in high-dynamics robotics, AGVs, and pick-and-place machines using nominal voltages up to 72 VDC.\u003c\/p\u003e\n\u003ch3\u003eTechnical Configuration (Deep Dive)\u003c\/h3\u003e\n\u003cp\u003eThe EJ9576 is built on a high-speed 2-point control architecture to handle rapid energy spikes:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eAdjustable Threshold Logic:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThrough CAN over EtherCAT (CoE) parameters, engineers can fine-tune the chopper voltage threshold. This allows the module to adapt to various power supply profiles and battery-buffered systems, preventing premature triggering or dangerous overvoltage peaks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePlug-in Module Design:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePart of the EJ system, this module uses a 2 x 20-pin socket strip for connection to a signal distribution board. Its mechanical coding pins ensure error-free assembly, making it ideal for large-scale series production where rapid, tool-less replacement is required.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIntegrated Diagnostics:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module provides real-time feedback via the E-bus, including internal board temperature and over\/undervoltage status. This proactive monitoring allows the TwinCAT master to adjust motion profiles if the braking resistor reaches thermal limits.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification Details\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eEJ9576\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eBECKHOFF\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eTechnology\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eBrake Chopper (2-point control)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNominal Voltage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUp to 72 VDC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMax. Ripple Current\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e10 A\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInternal Capacity\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e155 uF\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInternal Resistance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u0026lt; 5 mOhm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eElectrical Isolation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1500 V (E-bus \/ Field potential)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to +55 deg C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e12 mm x 66 mm x 55 mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eHousing\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eEJ-12-16pin, Polycarbonate\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eApprox. 30 g (Shipping weight 2 kg)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eTechnical FAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat type of braking resistor is recommended for the EJ9576?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBeckhoff recommends a 10 Ohm resistor with a typical power rating of 100 W. However, the exact wattage depends entirely on the duty cycle of your braking maneuvers and the total inertia of the mechanical system.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan multiple EJ9576 modules be used in parallel?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhile the EJ9576 manages local bus segments, parallel operation requires careful synchronization of the chopper thresholds via CoE data to ensure balanced load distribution across multiple resistors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the 2-point control affect the braking resistor?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module uses a high-speed clock rate (max. 100 us) to switch the resistor on and off. This load-dependent switching ensures that the DC bus voltage remains within a 1 V control range, providing a smooth and stable voltage profile even during aggressive deceleration.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eEngineering \u0026amp; Installation Guide\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eResistor Selection \u0026amp; Safety:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAlways use a braking resistor with appropriate thermal protection. Since the EJ9576 switches at high frequencies, the resistor can become extremely hot. Ensure the signal distribution board is designed with sufficient trace width to handle the 10 A peak ripple current.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSignal Distribution Board Layout:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWhen designing the PCB for the EJ module, ensure the 2 x 20-pin socket strip is perfectly aligned with the mechanical coding holes. The latching lug must engage securely in the circuit board cut-out to prevent disconnection during high-vibration operation (conforming to EN 60068-2-6).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eThreshold Parameterization:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUse TwinCAT to set the \"Chopper Voltage\" threshold at least 2-3 V above the nominal power supply voltage to prevent the chopper from activating during normal operation or minor supply fluctuations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eEJ9576\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eoffers a distinct advantage for machine builders looking to reduce the footprint of their control cabinets. By moving the brake chopper functionality into a plug-in I\/O format, it eliminates the need for bulky, stand-alone chopper units. Its ultra-low internal resistance (\u0026lt; 5 mOhm) minimizes heat dissipation within the module itself, shifting the thermal load to the external resistor where it can be managed more effectively. This modularity, combined with the \"Performance\" level of EtherCAT diagnostics, makes it a superior choice for high-reliability industrial automation.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"BECKHOFF","offers":[{"title":"Default Title","offer_id":53106704941419,"sku":"EJ9576","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/ej9576-2tvbwyemtaq.png?v=1776244345","url":"https:\/\/www.plcprotech.com\/fr\/products\/beckhoff-ej9576-ethercat-brake-chopper-plug-in-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}