Product Overview

The Allen-Bradley 1336-L4 Less Encoder Board is a specialized control interface option board designed for the Allen‑Bradley 1336 series of AC variable frequency drives, including the 1336 PLUS, 1336 PLUS II, 1336 FORCE, and 1336 IMPACT platforms-11-12-13. This board provides a means of interfacing various signals and commands to the drive through contact closures, enabling external control and monitoring of drive functions-11-14. The 1336-L4 Allen-Bradley is specifically identified as the “Less Encoder” version, meaning it does not include encoder feedback inputs. This distinguishes it from variants like the L4E or L7E, which support encoder feedback for closed-loop vector control applications-13-14.

As a Contact Closure Interface, the Allen-Bradley 1336-L4 accepts dry contact inputs from external switches, relays, or PLC outputs, translating these discrete signals into control commands for the drive-11-13. This allows operators to start, stop, reverse, and select preset speeds without using the drive’s keypad or a communication network. The board typically provides nine control inputs, with seven being user-configurable and two factory-defined for essential functions like “Enable” and “Stop”-11-13. The 1336-L4 is installed in a dedicated slot on the drive’s main control board, making it a critical component for systems requiring simple, reliable, and cost-effective external control of the drive’s operation.

The 1336-L4 Allen-Bradley option board is powered by the drive’s internal +5V DC supply and utilizes TTL logic for signal processing-5-10. Its compact design and straightforward integration make it an ideal solution for applications where basic discrete I/O control is sufficient and encoder feedback is not required. For facilities operating legacy 1336 series drives, the Allen-Bradley 1336-L4 is an essential spare part to maintain system functionality, as it allows for easy replacement and minimizes downtime-10.

Technical Specifications