## 3G3AX-RBB2001: External Braking Resistor The **3G3AX-RBB2001** is an external braking resistor unit manufactured by OMRON. It is specifically designed for use with OMRON AC Drives (Inverters), such as the **MX2**, **RX**, or **RX2** series. ### 1. General Specifications The primary function of this component is to dissipate regenerative energy produced by the motor during deceleration as heat, preventing "Overvoltage" faults in the inverter. | Specification | Details | | :--- | :--- | | **Model** | 3G3AX-RBB2001 | | **Resistance Value** | 200 $\Omega$ | | **Nominal Capacity** | 120 Watts | | **Short-time Rating** | 10% (Maximum duty cycle) | | **Compatibility** | Typically used with 200V or 400V class Inverters (low HP/kW) | --- ### 2. Key Features and Components * **Resistive Element:** High-stability wire-wound resistor designed to handle rapid thermal cycles. * **Chassis:** Compact, metal-housed unit with mounting holes for heat dissipation and secure installation. * **Protection:** Often includes a thermal fuse or allows for the connection of a thermal relay to prevent overheating. * **Wiring Terminals:** Screw terminals for secure connection to the `P/+` and `RB` (or `B1/B2`) terminals on the inverter. --- ### 3. Application Use Case When a motor stops quickly or holds a heavy load moving downward, it acts as a generator. This energy flows back into the inverter's DC bus. The 3G3AX-RBB2001 "burns off" this excess energy. **Common Applications:** * Conveyor belts with frequent start/stop cycles. * Small cranes or hoists. * High-inertia fans or centrifuges. --- ### 4. Installation & Safety > **Warning:** Braking resistors get extremely hot during operation. 1. **Mounting:** Install vertically in a well-ventilated area away from flammable materials. 2. **Wiring:** Use heat-resistant cables. 3. **Parameter Settings:** The inverter software must be programmed to recognize the external resistor (usually by setting the "Braking Resistor Selection" parameter). ---