Allen-Bradley 1336 PLUS II Modules: AB 1336-PB-SP6C 74101-181-51

Technical Dossier

Product Details And Specifications

Allen-Bradley 1336 PLUS II Series Technical Notes

The Allen-Bradley 1336 PLUS II is a medium-voltage AC variable frequency drive (VFD) platform developed by Rockwell Automation. It has been deployed across heavy industrial sectors globally, including petrochemical refineries, nuclear power auxiliary systems, offshore platforms, and large-scale chemical processing facilities. The 1336 PLUS II succeeded the original 1336 PLUS and introduced enhanced IGBT gate drive architecture, expanded communication adapter support, and modular board-level serviceability — making it one of the most widely maintained legacy VFD platforms in the installed base of process industries.

The drive family covers output ratings from fractional horsepower to several hundred horsepower, operating on 200–600 VAC three-phase input. Its modular design means individual PC boards, snubber assemblies, gate driver boards, and communication modules can be replaced independently without full drive replacement — a critical factor for facilities operating under long maintenance cycles.

The Evolution of 1336 PLUS II Architecture

The 1336 family originated in the early 1990s as Rockwell Automation's response to demand for standardized, field-serviceable AC drives in process industries. The original 1336 PLUS used bipolar transistor output stages. The 1336 PLUS II transitioned to IGBT-based output stages, reducing switching losses and enabling higher carrier frequencies with lower acoustic noise.

Key architectural milestones:

Compatibility note: 1336 PLUS II boards are frame-size and revision-specific. Substituting boards across incompatible revisions can result in drive faults or damage. Always verify the catalog number suffix (e.g., SP6C, SP2D) against the drive's nameplate and existing board revision.

1336 PLUS II Full Catalog & Functionalities (SKU List)

The following part numbers represent verified, commonly sourced components within the Allen-Bradley 1336 PLUS II platform. Each entry reflects a distinct board-level or module-level assembly.

Pre-Charge / Power Interface Boards

• 1336-PB-SP6C (74101-181-51): Pre-charge PC board; controls inrush current limiting during DC bus energization. Frame-specific revision C variant.
• 1336-PB-SP2C: Pre-charge board, alternate frame revision; functionally equivalent pre-charge control for smaller frame sizes.
• 1336-PB-SP1D: Pre-charge board revision D; updated gate signal isolation for improved EMI immunity.
• 1336-PB-SP2D: Pre-charge board for mid-range frames; revision D with enhanced thermal management traces.

Snubber / Gate Driver Boards

• 1336-SN-SP6A: Snubber board assembly for Frame 6; suppresses voltage transients across IGBT modules during switching.
• 1336-SN-SP2A: Snubber board for Frame 2; RC snubber network integrated on PCB.
• 1336-SN-SP6C: Snubber board revision C for Frame 6; updated component ratings for higher bus voltage tolerance.

Gate Driver / Base Drive Boards

• 1336-BDB-SP74D: Base drive board revision D; provides isolated gate drive signals to IGBT power modules in Frame 7 drives.
• 1336-BDB-SP57D: Base drive board for Frame 5/7 configurations; dual-channel isolated gate drive output.
• 1336-BDB-SP30D: Base drive board for Frame 3; compact layout with integrated fault feedback optocouplers.

Main Control Boards

• 1336-GM5: Main control board for Frame 5 drives; DSP-based vector control, SCANport interface, analog/digital I/O.
• 1336-GM6: Main control board for Frame 6; expanded memory and enhanced parameter set over GM5.
• 1336-L6: Logic/control board for Frame 6; handles speed reference processing and fault diagnostics.
• 1336-L7: Logic board for Frame 7 high-horsepower drives; supports dual encoder feedback inputs.
• 1336-F-MCB-SP1G: Main control board assembly revision G; field-replaceable unit for 1336 FORCE variant drives sharing 1336 PLUS II backplane architecture.

Communication / Interface Modules

• 1336-MOD-G1: SCANport-to-DeviceNet communication adapter; enables integration with DeviceNet networks for remote parameter access and control.
• 1336-MOD-KB: SCANport keypad/display module; local HMI for parameter programming and fault readout without external programming device.
• 1336-QC-SP1A: Quiet current board assembly; reduces audible noise in low-speed operation by modifying carrier frequency profile.

Sourcing Hard-to-Find & Obsolete 1336 PLUS II Parts

Our sourcing capabilities for the 1336 PLUS II include:

• Pre-charge boards (all frame revisions, including SP6C, SP2C, SP1D, SP2D)
• Gate driver and base drive boards (BDB series, all frame sizes)
• Main control boards (GM5, GM6, L6, L7)
• Snubber assemblies (SN series)
• Communication adapters (MOD-G1, MOD-KB)
• Complete drive assemblies for cannibalization or direct replacement

Quality Control for the 1336 PLUS II Range

The 1336 PLUS II's backplane and SCANport bus architecture require board-level testing that goes beyond simple continuity checks. DriveKNMS applies the following test protocols to all 1336 PLUS II components prior to shipment:

Q: How is condition confirmed before quotation?
A: Available condition, photos, test records and documentation are checked according to the requested model and sourcing channel before a formal RFQ response.