ABB FEN-31
ABB FEN-31 - Image 2

ABB FEN-31

Product Introduction:
The ABB FEN-31 is a dedicated HTL (High Threshold Logic) encoder interface module designed for ABB industrial drives such as the ACS850 and ACS880 series. It serves as the critical hardware bridge between the drive’s control board and various types of HTL incremental encoders, ensuring accurate speed and position feedback.

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Category: SKU: ABB FEN-31

Description

ABB FEN-31

Technical Specifications:

  • Supported Encoders: Differential push-pull, single-ended push-pull, open collector, and open emitter HTL encoders.
  • Supply Voltage: +15 V DC ± 20% (200 mA max) or +24 V DC ± 20% (200 mA max).
  • Signal Frequency: Detects signal frequencies up to 300 kHz.
  • Speed Range: -32,768 to +32,767 RPM.
  • Resolution: Speed resolution of 0.04 RPM (24 bits); Position resolution of 16 M counts/rev (24 bits).
  • Max Power Consumption: 350 mA at 24 V (max combined 5W for encoders, latches, and cabling).
  • Protection Degree: IP20.

Functional Features:

  • TTL Emulation Output: Provides an RS-422-standard-compliant TTL encoder emulation output for daisy-chaining or secondary monitoring.
  • Digital Inputs: Includes two digital latch inputs for capturing precise position markers.
  • Cable Fault Diagnostics: Built-in diagnostic capabilities for specific HTL encoder types to detect wiring issues.
  • Temperature Sensor Support: Dedicated connections for PTC, Pt1000, or KTY temperature sensors.

Application Scenarios:

  • High-precision speed and position control in conveyor systems, cranes, and hoists.
  • Closed-loop vector control applications requiring accurate motor feedback.
  • Multi-drive synchronization in paper, printing, and textile machinery.

Performance Parameters:

  • Signal Levels: Logic “0” < 3.5 V and Logic “1” > 7.5 V.
  • Position Accuracy: 4x pulse count per revolution.
  • Cable Length Support: Up to 300 m for differential push-pull, 200 m for single-ended push-pull, and 100 m for open collector/emitter encoders.

Material Composition & Structural Features:

  • Connectors: Features a 20-pin socket, two 7-pin detachable plugs (max 2.5 mm² wire), a 9-pin D-Sub, and a 6-pin detachable plug (max 1.5 mm² wire).
  • EMC Protection: Shielded connections and isolated digital inputs to prevent electromagnetic interference in harsh industrial environments.

Working Principle:
The module conditions the incoming HTL encoder signals, filters out electrical noise, and translates them into precise digital position and speed data for the drive’s control algorithm. It simultaneously generates a clean TTL emulation signal for external devices.

Installation Requirements:

  • Insert the module into the designated option slot on the drive control board.
  • Secure the module using the provided mounting screw to ensure proper grounding and EMC compliance.
  • Use shielded instrumentation cables, preferably with twisted pairs, for encoder connections.

Usage Precautions:

  • Carefully set the supply voltage jumpers on connector X81 before powering up; selecting the wrong voltage will damage the encoder.
  • Configure DIP switches correctly when using open collector or open emitter encoders.
  • Do not exceed the maximum combined power consumption of 5W for all connected sensors and cabling.

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