Rockwell Automation 1336-BDB-SP29D Gate Drive PCB

Technical Specifications

Main Features and Advantages

Precision and Protection: The Allen-Bradley 1336-BDB-SP29D​ is engineered for precision switching and robust protection. It generates the high-current pulses needed to charge and discharge the IGBT gate capacitance rapidly, ensuring clean switching transitions that minimize power losses and electromagnetic interference (EMI). This precise control is critical for maintaining drive efficiency and motor performance. Its most vital advantage lies in its integrated protection suite. The desaturation detection circuit monitors the collector-emitter voltage of the IGBT during its “on” state. If an overcurrent or short-circuit condition causes the IGBT to come out of saturation, the 1336-BDB-SP29D​ detects this voltage spike and commands a “soft” shutdown, protecting the expensive IGBT power module from destructive failure. This proactive fault management is essential for drive longevity.Reliability and Serviceability: The board is designed for the harsh electrical environment of a power inverter, with reinforced isolation barriers that prevent high-voltage transients on the DC bus from propagating back to the sensitive control electronics. The use of fiber-optic or high-grade opto-coupler interfaces for signal transmission to the Allen-Bradley 1336-BDB-SP29D​ ensures noise-immune communication, free from ground loop issues. From a maintenance perspective, this board is a common field-replaceable unit (FRU). When a drive experiences a power stage fault, the 1336-BDB-SP29D​ is often inspected and tested. Being able to replace this dedicated PCB, rather than the entire power stack or control module, offers a significant cost and time-saving advantage for drive repair, minimizing machine downtime and extending the service life of the overall 1336 PLUS drive.

Application Field

The Allen-Bradley 1336-BDB-SP29D​ gate drive board is an internal component with a singular, critical application: it is used exclusively within the inverter power section of Allen-Bradley 1336 PLUS and 1336 FORCE series AC variable frequency drives (VFDs). These drives are workhorses in industrial motor control across virtually every sector. Therefore, the application field of the 1336-BDB-SP29D​ mirrors that of the drives it enables. In industrial manufacturing, it is found inside drives controlling conveyor systems, machine tool spindles, extruders, and mixers, where precise speed regulation is crucial for product quality and process consistency. The board’s reliable operation ensures these motors receive stable, controlled power.In infrastructure and building management, the Allen-Bradley 1336-BDB-SP29D​ operates within drives managing pumps for water supply, wastewater treatment, and HVAC systems, as well as fans for ventilation and cooling towers. The board’s protective features are vital here, as pump and fan failures can lead to significant operational disruption. Furthermore, in the oil & gas, mining, and power generation industries, 1336 drives control critical equipment like compressors, crushers, and large induced-draft fans. In these high-availability environments, the robustness and fault-protection capabilities of the 1336-BDB-SP29D​ are essential for preventing costly unplanned outages and protecting expensive mechanical assets from the damage caused by motor drive faults. Its role, though internal, is foundational to the reliable variable-speed operation of three-phase AC motors in demanding industrial settings worldwide.