Lenze 2008EB2 Dynamic Braking Chopper Module

The Lenze 2008EB2, also referenced as EMB 2008-EB2, is an electronic dynamic braking chopper module within the EMB Series Brake Modules designed for frequency inverter drives such as the Lenze 2000 Series. When driven electric motors undergo rapid deceleration or handle overhaul loads in high-inertia applications—including conveyors, cranes, and automated packaging equipment—regenerative energy flows back into the inverter DC link bus. The 2008EB2 monitors the DC bus voltage and automatically redirects excess electrical energy to an external power resistor when voltage hits the factory switching threshold of 765 V DC. Housed in an IP20 panel-mount enclosure, the module handles up to 8 kW peak braking power and 0.8 kW continuous dissipation power with a maximum DC bus capacity of 800 V DC on 400V or 480V mains frequency drives.

Wiring interfaces on the 2008EB2 consist of standard screw terminals for connecting the DC link bus (+UG, -UG), the external power resistor (RB1, RB2), and an integrated thermal monitoring safety loop (T1, T2). Putting a spare unit into service does not require software parameter configuration, digital file loading, or communication programming, as the unit relies entirely on autonomous hardware control circuits. During installation, field technicians must observe correct DC bus polarity and verify that the external resistor maintains a minimum resistance of 70 Ohms to prevent current overload across the internal switching transistors. The potential-free thermal contact (T1/T2) must be wired into the drive enable or main contactor control circuit to ensure dynamic braking safety. ABC Industrial Parts can assist maintenance teams with fast replacement units and hardware support to get production lines operational again.

Diagnostics and operating states are indicated directly on the front panel of the module using three LEDs. A solid green READY / POWER LED confirms that valid DC link voltage is connected and internal control electronics are healthy. A solid yellow BRAKE / IMPULSE LED indicates active chopper switching while energy dissipates through the external resistor, and a solid red TRIP / OVERTEMP LED highlights an internal heatsink thermal trip. If an over-temperature condition occurs, initial field checks should confirm cabinet airflow, check ambient temperature limits, evaluate deceleration frequency, and measure resistor value across terminals RB1 and RB2. If terminal connections are intact but internal power components fail, ABC Industrial Parts provides tested exchange options and professional repair services to resolve hardware faults efficiently.