Description

Product Overview

The Allen‑Bradley 1336-L6E/L9E is a 115 V AC control interface option board for Bulletin 1336 IMPACT and PLUS II variable frequency drives, adding isolated discrete inputs plus encoder feedback for closed-loop motor speed regulation. This plug-in PCB provides nine configurable digital inputs accepting 115 V AC contact signals and dedicated encoder channels to capture pulse feedback directly from the motor shaft, enabling high-precision closed-loop vector control. It resolves speed drift and poor low-speed performance common in open-loop VFD operation, while supporting remote contact-closure commands from relays and PLC dry contacts. Automation technicians and system integrators rely on this board to upgrade legacy drives for tighter speed control and to replace failed interface hardware. The screw terminal block simplifies wiring for field signals, and onboard signal isolation reduces electrical noise interference between 115 V AC control circuits and the drive’s low-voltage logic. Word count overview:174

Technical Specifications

• Product Model: 1336-L6E/L9E
• Brand: Allen‑Bradley
• Warranty: One Year
• Input Voltage: 115 V AC, 50/60 Hz control input
• Operating Temperature: 0 °C to 60 °C
• Storage Temperature: -40 °C to 85 °C
• Response Time: Fast encoder pulse sampling, configurable digital input filtering
• Protection Class: IP20 (mounted internally inside 1336 drive enclosure)
• Accuracy Class: Encoder-based closed-loop speed regulation
• Output Frequency: Not applicable (interface board)
• Rated Current Range: ~20 mA per digital input channel
• Communication Interface: Edge connector to main drive control board; encoder differential input; screw terminal TB3
• Supported Protocols: Pulse encoder feedback; discrete contact closure logic
• Overload Capacity: Input surge suppression, ESD protection for encoder circuit
• Dimensions: 178 mm × 76 mm × 25 mm
• 

Application Scenarios

• Web Processing & Printing Machine Speed Control: This interface board adds encoder feedback to 1336 drives on web handling equipment. The 1336-L6E/L9E maintains precise line speed and tension control, eliminating web stretch and registration errors by continuously comparing commanded speed against actual shaft rotation.
• Heavy-Duty Conveyor Closed-Loop Regulation: Installed inside 1336 drive cabinets for bulk material conveyors, the board accepts 115V AC interlock and preset-speed contact signals. Encoder feedback prevents speed sag under heavy loading and enables fast detection of belt slip conditions.