Product DescriptionThe 3RA29020 is an interface and braking module designed for the Reliance Electric HR2000 servo system. It works in combination with servo controllers such as 3RA2002 and 3RA2004 to handle DC bus monitoring and regenerative energy dissipation. This product is no longer in production, and refurbished units are commonly used for maintenance and replacement of legacy servo systems.

Model Number Interpretation3RA represents the product platform of HR2000 servo series. 29020 is the specific part code for interface and braking module, which is compatible with 2 HP to 4 HP servo controllers.

Technical SpecificationsThis module is used for DC bus voltage monitoring and braking current regulation. The detection threshold of DC bus voltage is 50 VDC. It is equipped with built-in braking transistor to absorb regenerative energy. A red LED indicator will light up when braking current is generated. It provides non-contact transistor switch output. The operating ambient temperature ranges from 0 degree Celsius to 40 degree Celsius. The overall weight is approximately 0.88 kilograms. It adopts vertical installation mode and is suitable for clean and dry working environment.

Interface and Communication ConfigurationThe module gets power supply from the DC bus of matched servo controller. Main terminals include S1 and S2 for switch signal output. A dedicated LED indicator is used to show braking status. There is no additional communication interface, and it operates through hardwired signal connection. This module is fully compatible with 3RA2002 and 3RA2004 series servo controllers.

Core FunctionsIt monitors DC bus voltage in real time to prevent abnormal voltage fluctuation. The built-in braking circuit consumes regenerative energy and protects the system from overvoltage damage during deceleration. It transmits operating status via switch output for system interlock and alarm. The compact structure allows easy installation and seamless integration with HR2000 servo controllers.

Application ScenariosIt is mainly matched with 3RA2002 and 3RA2004 servo controllers for CNC machine tools, robotic equipment and packaging machinery. It serves as a direct replacement of original braking modules for old HR2000 servo systems to solve overvoltage issues caused by regenerative energy.

Usage and Maintenance InstructionsMount the module vertically beside the servo controller and keep the surrounding area well ventilated. Connect the signal terminals S1 and S2 to external control circuit correctly. Check terminal connections and DC bus status before powering on. Carry out regular quarterly maintenance to remove dust and inspect LED indicators and tightness of terminals. Disconnect all power sources and wait for internal capacitors to fully discharge before any inspection or maintenance work.