HEIDENHAIN ROD 426.0003 Rotary Encoder

Technical Specifications

Model： ROD 426.0003-1800

Brand： HEIDENHAIN

Product Type: Integrated bearing incremental rotary encoder for CNC spindle and rotary axis

Module Feature:

Function: HEIDENHAIN ROD426.0003 incremental rotary encoder with built-in precision bearing. It generates differential A/B/Z TTL square wave pulse signals with 1800 signal periods per revolution. Used for spindle rotation speed and angular position detection, provides feedback signals for closed-loop spindle control on heavy horizontal boring mills and large machining centers.

Measuring principle: Incremental optical scanning Line count: 1800 lines per revolution Output Signal: Differential TTL square wave A/B/Z pulses Onboard components: DIADUR optical grating disc, optical scanning assembly, precision bearing set, metal housing, M23 flange connector

LED indicators: POWER, SIG, FAULT diagnostic lights

Hardware self-diagnosis: Signal amplitude monitoring, pulse signal integrity inspection

Programming software: HEIDENHAIN proprietary diagnostic software for pulse signal status checking

Electrical Parameters

Supply voltage: 5VDC ±10%

Power consumption: Max 2.3W

Mechanical & Structure:

Mounting: Coupled to machine spindle via flexible shaft coupling Shaft: Solid shaft Protection class: IP64 (encoder housing)

Environmental:

Operating temperature: 0℃ ~ +70℃

Ambient humidity: 5~85% non-condensing

Certification: CE

Status: Manufacturer legacy incremental rotary encoder

System compatibility

Compatibility description: ROD426.0003-1800 belongs to HEIDENHAIN ROD400 rotary encoder family. Differential TTL output compatible with Fives Giddings & Lewis PIC900 CNC axis control board. Widely applied for spindle feedback on heavy CNC boring mills.

Function

Function description: ROD 426.0003-1800 is incremental rotary encoder manufactured by HEIDENHAIN. Installed on spindle end through flexible coupling. The optical grating disc generates differential TTL pulse signals to feed back spindle rotation speed and angular position to CNC controller. Metal housing protects internal optical components from workshop dust, coolant and oil mist. The reference mark pulse is used for spindle orientation homing after power-up. It is legacy spindle position measuring spare for heavy CNC boring mills.

Installation

Installation steps: Follow lockout/tagout safety procedure before installation. Cut off encoder 5VDC control power. Mount encoder on spindle end, install flexible coupling and adjust concentricity. Connect shielded encoder cable to CNC axis control board. Restore power, verify POWER and SIG LED indicators, run encoder diagnostic and check pulse reading.

Interface

Interface list: M23 multi-pin flange connector, 5VDC power terminal,on-board POWER / SIG / FAULT LED indicators for HEIDENHAIN ROD 426.0003-1800.

Diagnostic

Troubleshooting: No spindle speed feedback: Check 5VDC power supply, cable breakage or damaged connector pins. FAULT LED lit: Low signal amplitude, grating disc contamination or coupling misalignment. Intermittent position jumping: Electromagnetic noise interference, coupling wear or aging optical components.

Product Brief

Brief description: ROD 426.0003-1800 is HEIDENHAIN legacy incremental rotary encoder with 1800 lines and differential TTL output,provides spindle speed and angular position feedback for heavy CNC boring mill spindle closed-loop control,legacy spindle encoder spare.