ABB FEN-21 Resolver Interface - Encoder Module for Drive

ABB FEN-21 Resolver Interface

The FEN-21 resolver interface provides high-precision position feedback for ABB drive systems. This advanced interface supports both resolver and TTL encoder connections. It delivers exceptional 24-bit resolution for precise motion control applications.

Product Overview

The FEN-21 offers reliable encoder interface capabilities with robust industrial protection. This module handles various encoder types with flexible connectivity options. It ensures accurate position and speed feedback in demanding automation environments.

Technical Specifications

Power Specifications

• Maximum power consumption: 3.6W combined
• TTL encoder power: +5.5V DC, 180 mA
• Digital input power: +24V DC ±15%, 150 mA
• Resolver output: 4-12 Vrms, 100 mA maximum
• Short-circuit proof outputs

Performance Characteristics

• Speed range: -32768 to 32767 rpm
• Speed resolution: 24-bit (0.004 rpm)
• Position resolution: 24-bit (16.8 million/revolution)
• Position accuracy: 4x pulse count per revolution
• Maximum frequency: 500 kHz TTL input

Connection Interfaces

• 20-pin socket for drive connection
• 9-pin D-sub plug and socket
• 15-pin D-sub plug for resolver
• 6-pin header for additional I/O
• RJ-45 style encoder connections

Encoder Support

• TTL incremental encoder input
• RS-422/485 differential signals
• Resolver sine/cosine inputs: 2-7 Vrms
• Thermistor inputs: KTY84 or PTC
• Signal levels: Under 5V = 0, Over 15V = 1

Installation Requirements

• IP20 protection degree maintained
• Follow drive hardware manual conditions
• Use proper cable types and gauges
• Observe maximum cable length limits
• Maintain signal isolation requirements

Cable Specifications

• TTL encoder 5V: 30m with 0.5mm² power cable
• TTL encoder 5V: 60m with dual 0.5mm² power cables
• TTL encoder 10-30V: 100m maximum length
• Resolver connection: 100m maximum length
• Proper shielding required for all cables

Isolation and Protection

• Digital inputs share isolation with TTL input
• Resolver interface isolated with TTL emulation
• IP20 degree of protection
• Short-circuit proof voltage outputs
• Industrial noise immunity

Frequently Asked Questions

What is the position resolution?

The FEN-21 provides 24-bit position resolution, equal to 16.8 million counts per revolution.

What encoder types are supported?

The interface supports TTL incremental encoders, resolvers, and RS-422/485 differential encoders.

What is the maximum cable length?

Maximum cable length is 100 meters for 10-30V TTL encoders and resolver connections.

What power does the TTL encoder need?

The module provides +5.5V DC at 180 mA maximum for encoder power supply.

What isolation is provided?

The digital inputs share isolation with TTL encoder, and resolver has separate isolation.