Fives Group 502-03840-03 Servo Interface Module

Technical Specifications

Model： 502-03840-03

Brand： Fives Group

Product Type: Rack mount servo interface PCB assembly for legacy CNC system

Module Feature:

Function: Servo interface module for Fives Group CNC platform. Collects differential incremental encoder position feedback signals from servo motors, transmits position data back to CNC CPU. Converts digital motion commands into ±10V analog velocity signals and sends to analog servo amplifiers for heavy horizontal boring mills and large machining centers.

Feedback interface: Differential incremental encoder input Command output: ±10V analog velocity command

Bus interface: Parallel backplane bus for bidirectional data exchange with CNC CPU

Onboard components: Encoder receiver circuits, D/A converters, signal isolation, noise suppression and short-circuit protection

LED indicators: POWER, ENC, CMD, FAULT diagnostic lights

Hardware self-diagnosis: Encoder signal loss detection, analog output overrange check, backplane bus communication test

Programming software: Fives Group proprietary CNC software for axis scaling and module diagnostic testing

Electrical Parameters

Backplane supply: +5VDC Analog reference supply: ±15VDC

Power consumption: Max 8.8W

Mechanical & Structure:

Mounting: Rack slot mount with gold finger edge connector

Weight: 1.05kg

Protection class: IP20

Environmental:

Operating temperature: 0℃ ~ +55℃

Ambient humidity: 5~85% non-condensing

Certification: CE

Status: Manufacturer discontinued legacy servo interface module

System compatibility

Compatibility description: 502-03840-03 belongs to Fives Group CNC servo interface family. Compatible with Fives Group CPU, analog servo drives and incremental encoder equipped servo motors. Widely fitted on heavy Fives Group horizontal boring mills.

Function

Function description: 502-03840-03 is servo interface board manufactured by Fives Group. It acts as signal bridge between CNC controller and analog servo amplifiers. It receives incremental encoder position feedback from servo motors and feeds position data back to CNC for closed-loop control. It converts digital motion instructions to ±10V analog speed command to regulate servo motor velocity. Built-in signal isolation protects controller against electrical interference from machine side. It is legacy servo interface spare for heavy CNC boring mills.

Installation

Installation steps: Follow lockout/tagout safety procedure before installation. Cut off rack +5V and ±15VDC analog power. Insert 502-03840-03 board into rack slot and secure gold finger connector. Connect shielded encoder cables and analog command cables to terminal block. Configure axis resolution and calibrate analog offset/gain via CNC software. Power on rack, verify ENC and CMD LED status, test axis homing and positioning accuracy.

Interface

Interface list: Backplane gold finger connector, encoder D-sub port, analog command screw terminal block,on-board POWER / ENC / CMD / FAULT LED indicators for Fives Group 502-03840-03.

Diagnostic

Troubleshooting: Axis no movement: Check ±15V reference supply, analog wiring or D/A channel damage. FAULT LED lit: Encoder signal loss, analog output short circuit or backplane communication failure. Position drift: Ground loop interference, poor shielding or aging analog components.

Product Brief

Brief description: 502-03840-03 is Fives Group legacy servo interface board,with incremental encoder feedback acquisition and ±10V analog speed command output for heavy CNC boring mill servo axes,discontinued CNC servo interface PCB spare.