Product Overview

The 1336F-B050-AN-EN-L6​ is a high-performance adjustable frequency AC drive manufactured by Allen-Bradley, a brand of Rockwell Automation, and belongs to the well-regarded 1336 PLUS II (1336F) series of variable frequency drives (VFDs). Designed for 380–480 VAC three-phase input power, this model delivers a continuous output rating of 50 HP (37 kW) at 75 amps, making it suitable for medium-to-large induction motor control in demanding industrial environments. The 1336F-B050-AN-EN-L6​ features an open-type (IP00) chassis-mount design intended for panel integration, and is equipped with an English-language Human Interface Module (HIM) keypad as well as the L6 control option providing 115 VAC control power input and encoder feedback capability for enhanced closed-loop or monitored applications.As a member of the 1336 PLUS II platform, the 1336F-B050-AN-EN-L6​ offers both Volts-per-Hertz (V/Hz) and sensorless vector control modes, delivering excellent speed regulation, high starting torque, and smooth acceleration/deceleration profiling. It is positioned as a versatile general-purpose drive for pumps, fans, compressors, conveyors, mixers, and machine tool spindles where reliable variable speed control and straightforward integration into existing control architectures are required. The “AN” frame size provides generous terminal spacing and integral DIN-rail or bolt-mount provisions, while the absence of a built-in dynamic braking transistor leaves room for an external brake resistor if regenerative braking is needed. Plant maintenance and engineering teams value the 1336F-B050-AN-EN-L6​ for its proven reliability, broad global approvals, and extensive installed base—making it a practical choice for both new installations and legacy drive replacements in continuous-process and discrete-manufacturing facilities.

Technical Specifications

Main Features and Advantages

Flexible control for diverse loads: The 1336F-B050-AN-EN-L6​ supports both Volts-per-Hertz and sensorless vector control, allowing users to select simple V/Hz for pumps/fans or sensorless vector for applications requiring 150 % starting torque and ±0.5 % speed regulation without a shaft encoder. This flexibility lets a single drive platform serve mixed loads across a plant, reducing spare-parts variety. The L6 control card on the 1336F-B050-AN-EN-L6​ accepts a standard 115 VAC control supply and brings encoder-input terminals that can be wired to a standard quadrature encoder for speed monitoring, draw-mode comparison, or future upgrade to closed-loop flux vector with an appropriate option card.Comprehensive programmability and ramp control: Up to four independent acceleration/deceleration ramps can be configured on the 1336F-B050-AN-EN-L6, with S-curve shaping to soften mechanical start/stop on belted conveyors or long-travel gantries. Built-in DC injection braking, flying-start (catch-a-spinning-motor), and slip compensation further improve process smoothness. The English HIM on the 1336F-B050-AN-EN-L6​ provides local start/stop, frequency setpoint dial, fault readout with plain-text messages, and password protection—minimizing the need for a connected PC during routine commissioning.Energy optimization and process protection: In variable torque (fan/pump) mode, the 1336F-B050-AN-EN-L6​ automatically applies energy-saver algorithms that reduce motor excitation when load is light, contributing to measurable kWh savings. Integrated electronic motor overload protection (per NEC Class 10/20/30 selectable), undervoltage ride-through (sustains brief mains dips using DC bus energy), and phase-loss detection protect both the drive and the connected motor. Current-limit function prevents nuisance trips during high-inertia starts by clamping output current rather than faulting outright.Easy integration and legacy compatibility: The 1336F-B050-AN-EN-L6​ accepts 0–10 VDC, 4–20 mA, or digital preset speed references via its discrete and analog I/O terminals. Optional plug-in communications (DeviceNet, ControlNet, Remote I/O, Profibus DP—sold separately) allow seamless connection to Rockwell Logix PACs or third-party PLCs. For facilities migrating from older 1336 PLUS (non-F) drives, the 1336F-B050-AN-EN-L6​ retains similar terminal layout and parameter structure, easing retrofit wiring and technician training.