HEIDENHAIN EQN1325.049-20 Absolute Rotary Encoder

Technical Specifications

Model：EQN1325.049-20 Brand：HEIDENHAIN Product Type: Bearing-integrated multiturn absolute rotary encoder for CNC spindle and servo motor

Module Feature

Function: HEIDENHAIN EQN1325.049-20 is a multiturn absolute rotary encoder with integrated precision bearing. It delivers absolute angular position and rotation speed directly after power-up without reference homing. Adopts 1:10 tapered shaft with 9.25mm functional diameter for direct mounting onto motor spindle. It provides serial absolute data plus 1Vpp incremental sine/cosine signals. Widely used on heavy horizontal boring mills, high-speed machining centers and spindle closed-loop control systems.

Measuring principle: Absolute optical scanning Shaft specification: Tapered shaft 9.25mm, taper ratio 1:10 Encoder Interface: EnDat Onboard components: Optical grating disc, scanning assembly, precision bearing, metal housing, 12-pin connector

LED indicators: POWER, COM, FAULT diagnostic lights

Hardware self-diagnosis

Internal temperature monitoring, signal amplitude detection, EnDat communication fault diagnosis

Programming software

HEIDENHAIN diagnostic software for encoder parameter reading and fault log retrieval

Electrical Parameters

Supply voltage: 3.6VDC ~14VDC Power consumption: Max 0.8W

Mechanical & Structure

Mounting: Tapered shaft fitted directly onto spindle Protection class: IP40 (housing)

Environmental

Operating temperature: -40℃ ~ +115℃ Ambient humidity: 5~85% non-condensing Certification: CE Status: HEIDENHAIN heavy-duty multiturn spindle absolute rotary encoder

System compatibility

Compatibility description: EQN1325.049-20 belongs to HEIDENHAIN EQN1325 encoder family with EnDat interface. Compatible with HEIDENHAIN CC series control units. Suitable for Fives Giddings & Lewis PIC900 CNC heavy boring mill spindle axis.

Function

Function description: EQN1325.049-20 is multiturn absolute rotary encoder manufactured by HEIDENHAIN. The 1:10 tapered shaft connection reduces mechanical backlash and ensures stable transmission. Multiturn design can record multiple revolutions, absolute position data available immediately after power on. Robust mechanical construction withstands high spindle speed and workshop vibration. It is high precision spindle measuring spare for heavy CNC boring mills.

Installation

Installation steps: Follow lockout/tagout safety procedure before installation. Cut off encoder DC power. Install encoder onto tapered spindle shaft and fasten locking assembly. Connect shielded EnDat encoder cable to servo control unit. Restore power, verify LED indicators, run encoder signal test and spindle orientation calibration.

Interface

Interface list: 12-pin connector, DC power and EnDat signal terminals,on-board POWER / COM / FAULT LED indicators for HEIDENHAIN EQN1325.049-20.

Diagnostic

Troubleshooting: No encoder communication: Check 3.6~14V DC supply, cable breakage or connector pin damage. FAULT LED lit: EnDat communication timeout, low signal amplitude, over-temperature or shaft misalignment. Spindle orientation error: Shaft runout, loose mounting or contamination on optical grating.

Product Brief

Brief description: EQN1325.049-20 HEIDENHAIN multiturn absolute rotary encoder with 1:10 tapered shaft and EnDat interface,provides absolute spindle angular position and speed feedback for heavy CNC boring mill spindle closed-loop control,spindle encoder spare.