HEIDENHAIN EQN425 512 Absolute Rotary Encoder

Technical Specifications

Model：EQN425 512 Brand：HEIDENHAIN Product Type: Bearing-integrated multiturn absolute optical rotary encoder with stator anti-rotation coupling

Module Feature

Function: HEIDENHAIN EQN425 512 is multiturn absolute rotary encoder with built-in precision bearing. It delivers EnDat01 multi-turn absolute position data and 1Vpp sine/cosine incremental measuring signals, 512 incremental lines per revolution. It adopts blind hollow shaft with clamping ring, equipped with stator anti-rotation coupling to compensate axial and radial installation misalignment. It supports up to 4096 distinguishable revolutions, 8192 single-turn absolute positions, max operating temperature up to +100℃. Widely used on heavy horizontal boring mills, machining centers for spindle and servo motor closed-loop angular position & speed measurement.

Measuring principle: Absolute optical scanning + incremental sinusoidal signal Incremental lines: 512 lines per revolution Interface: EnDat 01 Output Signal: ~1 Vpp sine/cosine incremental signals Shaft specification: Blind hollow shaft with clamping ring Differentiable revolutions: 4096 turns Onboard components: Optical grating disc, scanning assembly, built-in bearing, metal housing, M23 17-pin connector

LED indicators: Not equipped on encoder body

Hardware self-diagnosis

Signal amplitude test, EnDat communication check, reference mark inspection, bearing noise & temperature monitoring

Programming software

HEIDENHAIN diagnostic software for encoder parameter reading and signal waveform analysis

Electrical Parameters

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

Mechanical & Structure

Mounting: Blind hollow shaft fitted onto spindle/motor shaft, stator anti-rotation coupling Protection class: IP64 (housing)

Environmental

Operating temperature: -40℃ ~ +100℃ Ambient humidity: 5~85% non-condensing Certification: CE Status: HEIDENHAIN heavy-duty multiturn absolute rotary encoder

System compatibility

Compatibility description: EQN425 series rotary encoder works with HEIDENHAIN EnDat controller and drives supporting 1Vpp signals. Suitable for Fives Giddings & Lewis PIC900 CNC heavy boring mill spindle and feed axis.

Function

Function description: EQN425 512 is multiturn absolute rotary encoder manufactured by HEIDENHAIN. It can read absolute multi-turn position directly after power-on without axis homing. The 1Vpp sine/cosine incremental signals support high interpolation resolution for high dynamic motion control. Hollow shaft design simplifies spindle assembly. Stator coupling absorbs mounting offset and protects internal bearing. Compact metal housing withstands machine workshop vibration and temperature fluctuation. It is core measuring spare for heavy CNC boring mill closed-loop motion control.

Installation

Installation steps: Follow lockout/tagout safety procedure before installation. Cut off all power supply. Fit encoder hollow shaft onto machine shaft, tighten clamping ring. Fix stator coupling to prevent housing rotation. Connect shielded EnDat encoder cable to control unit. Adjust mounting alignment, lock all fasteners. Restore power, run EnDat communication test and signal amplitude verification.

Interface

Interface list: M23 17-pin EnDat connector, 3.6~14VDC power and measuring signal terminals, no LED indicators on EQN425 512.

Diagnostic

Troubleshooting: No EnDat communication: Check power supply, cable breakage and connector pin contact. Weak incremental signal: Optical window contamination or shaft misalignment. Intermittent position loss: Loose clamping ring, bearing wear or cable abrasion.

Product Brief

Brief description: EQN425 512 HEIDENHAIN bearing-integrated multiturn absolute rotary encoder with blind hollow shaft,512 lines,EnDat01 and 1Vpp signal,used for spindle and servo motor angular position and speed measurement of heavy CNC boring mill,rotary encoder spare.