Product Details:

The SEW BTS20-300-40-IGBT is an external IGBT braking chopper unit belonging to the BTS series, specially developed for SEW MOVIDRIVE MDX61B, MD60A and MOVITRAC B variable frequency drives and servo drives. Different from the passive braking resistor models we processed before, this unit integrates high-power IGBT switching circuit inside, and it needs to be matched with an external braking resistor to form a complete four-quadrant energy dissipation system. The model parameter stands for 300 ohm matching resistance and 20kW continuous processing capacity. The IGBT chip inside controls the on-off timing of the braking loop according to the real-time DC bus voltage of the drive. When the motor generates regenerative energy and the bus voltage rises to the preset threshold, the IGBT is turned on to connect the braking resistor, converting surplus electric energy into heat energy, so as to suppress bus overvoltage fault for heavy-duty frequent braking and lifting applications.

This braking chopper adopts high-speed industrial IGBT power device, with fast response speed and strong overload resistance, can withstand repeated instantaneous peak current impact under high cycle braking conditions. It is equipped with internal monitoring circuits for IGBT overcurrent, IGBT overtemperature, braking loop short circuit and bus voltage detection. It can exchange status signals with the SEW drive through dedicated terminals, feeding back chopper ready, braking active and fault signals to the drive controller. If the internal IGBT is damaged, the drive will lose the active braking regulation channel. The system can only rely on the built-in braking function of the inverter itself, which is easy to trigger overvoltage alarm during rapid deceleration and lowering actions of heavy loads.

This unit adopts IP20 metal cabinet-mounted structure, reserved bus voltage sampling terminals, braking resistor output terminals and fault signal terminals for interlock wiring with the drive and external resistor. The working ambient temperature range is 0℃ to 55℃, and the storage temperature range is -20℃ to 70℃. The front panel is equipped with LED status indicators, which can display power supply status, braking activation state and fault code, helping maintenance technicians quickly judge whether the IGBT switching circuit works normally. It supports long-distance wiring with external braking resistors, and users can arrange the resistor outside the electric cabinet to disperse heat and reduce the heat load inside the cabinet.

This SEW BTS20-300-40-IGBT braking chopper is widely used as maintenance replacement spare parts for heavy-duty material conveyors, large packaging production lines, hoisting and lifting equipment, rotary printing machines and other automation equipment requiring high-power four-quadrant operation. Most spare parts circulating in the global industrial spare parts market are fully tested refurbished units. Before installation, technicians need to check the power terminals, IGBT module, driving circuit board and sampling circuit for burnout, bulging capacitor and pin oxidation. After wiring, complete bus voltage parameter setting, braking resistor matching configuration, no-load jog test and high-speed deceleration load test to verify the IGBT switching action and bus voltage stability. Regular cleaning of the cooling fan dust inside the chopper housing and inspection of terminal tightness can effectively reduce the failure rate of power devices and extend the service life of the chopper and the whole drive system.