FEN-31 HTL Encoder Interface Module for ABB Drives | ABB

The Original New ABB FEN-31 HTL Encoder Interface Module (3ABD68978955) is a high-performance feedback interface designed for ABB ACS drives, enabling precise closed‑loop speed and position control in demanding industrial motion control applications. Installed directly into the drive's option slot, the module connects incremental HTL (High Threshold Logic) encoders to the drive control system, providing accurate rotor position and speed feedback. Supporting input frequencies up to 500 kHz, the FEN‑31 facilitates high‑resolution control for hoists, cranes, conveyors, and web handling systems.

Core Engineering Highlights:
HTL incremental encoder interface | 500 kHz max input frequency | Supports 12‑24 V HTL encoders (differential push‑pull, single‑ended push‑pull, open collector, open emitter) | RS‑422‑compliant TTL encoder emulation output | Two digital inputs | PTC/KTY temperature sensor support | Cable fault diagnostics | Plugs directly into ABB drive option slot | IP20 protection | 24 V DC power supply | 0.1 kg weight

Key Features:

• Original New ABB FEN‑31 module (3ABD68978955)

• HTL encoder support – compatible with HTL incremental encoders (12‑24 V) for robust signal acquisition

• High‑speed operation – input frequency up to 500 kHz for high‑resolution control

• Closed‑loop control – enables precise speed and position regulation for demanding applications

• TTL encoder emulation output – RS‑422‑compliant output converts HTL signals to TTL‑compatible signals, expanding application range in various control systems

• Two digital inputs for receiving discrete control signals from peripheral devices

• Temperature sensor support – PTC, Pt1000, or KTY temperature sensor connection for real‑time motor temperature monitoring

• Cable fault diagnostics – specific to HTL encoder types, helps quickly locate and resolve cable‑related issues, minimizing system downtime

• Easy installation – plugs directly into ABB ACS drives (ACS355, ACS550, ACS580, ACS880)

• LED indicators for module status and fault monitoring

• Galvanic isolation between sensor connector and drive control unit connector

Applications:

• Closed‑loop speed and position control in hoists and cranes

• Conveyor systems and material handling

• Web handling and precision positioning systems requiring HTL encoder feedback

• Applications requiring high‑resolution rotor position feedback for demanding motion control

• ABB drive integration with HTL incremental encoders for precise speed and position regulation

• Industrial automation systems requiring temperature monitoring of critical mechanical components (PTC/KTY sensors)

Technical Specifications:

System Compatibility:

• Compatible with ABB ACS drives that support the FEN‑31 HTL encoder interface module

• Verified compatible drive families include: ACS355, ACS550, ACS580, ACS880

• Also compatible with ACS800 and ACS600 series drives

• Installs onto one of the option slots on the drive

• Can also be installed onto an FEA‑03 extension adapter

Related Products:

• FEN‑01 – TTL encoder interface module

• FEN‑11 – Absolute encoder interface module

• FEN‑21 – Resolver interface module

• FENA‑21 – Ethernet adapter module (EtherNet/IP, Modbus TCP, PROFINET IO)

• FIO‑11 – Analog I/O extension module

• FIO‑21 – Analog and digital I/O extension module

• ACS‑CP‑C – Basic control panel for ABB drives

• ACS‑AP‑I – Advanced control panel with graphical display

PLC ERA is an independent industrial automation distributor supplying genuine Original New products through established global supply channels. All products are factory sealed when applicable and undergo quality inspection prior to shipment. ABB is a trademark of ABB Group.