HEIDENHAIN ERN1387.035 Incremental Rotary Encoder

Technical Specifications

Model：ERN1387.035 Brand：HEIDENHAIN Product Type: Bearing-integrated incremental optical rotary encoder with stator anti-rotation coupling

Module Feature

Function: HEIDENHAIN ERN1387.035 is incremental rotary encoder equipped with built-in precision bearing. It outputs ~1.05Vpp sine/cosine A/B/Z incremental measuring signals, 2048 lines per revolution. It adopts 9.25mm 1:10 tapered shaft with friction locking installation design, matched with stator coupling to compensate axial mounting tolerance up to ±0.5mm. Max allowable operating temperature reaches +120℃. Widely used on heavy horizontal boring mills, machining centers and elevator traction machines for spindle and servo motor closed-loop position & speed measurement.

Measuring principle: Incremental optical scanning Incremental lines: 2048 lines per revolution Output Signal: ~1.05 Vpp sine/cosine incremental signals + reference mark Z pulse Shaft specification: 1:10 tapered shaft, functional diameter 9.25mm Onboard components: Optical grating disc, scanning assembly, built-in bearing, metal housing,14-pin double-row locking connector

LED indicators: Not equipped on encoder body

Hardware self-diagnosis

Signal amplitude test, reference mark detection, bearing noise inspection, signal waveform monitoring

Programming software

HEIDENHAIN diagnostic software for signal quality verification and parameter check

Electrical Parameters

Supply voltage: 5VDC ±5% Power consumption: ≤180mA

Mechanical & Structure

Mounting: 1:10 tapered shaft fitted onto motor rotor, stator anti-rotation coupling Protection class: IP40 (housing)

Environmental

Operating temperature: -40℃ ~ +120℃ Ambient humidity: 5~85% non-condensing Certification: CE Status: HEIDENHAIN heavy-duty incremental rotary encoder

System compatibility

Compatibility description: ERN1387 series encoder compatible with HEIDENHAIN EXE interpolation units and CNC drives supporting 1Vpp sinusoidal input. Suitable for Fives Giddings & Lewis PIC900 CNC heavy boring mill spindle and feed axis.

Function

Function description: ERN1387.035 is incremental rotary encoder manufactured by HEIDENHAIN. It delivers high-quality sine/cosine incremental signals for electronic interpolation to achieve ultra-high resolution. Reference mark Z pulse establishes machine datum after power cycle. The stator coupling absorbs axial installation offset and protects internal bearing from mechanical stress. Compact metal housing withstands vibration and high temperature in machine workshop environment. 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 tapered shaft onto motor rotor, tighten friction locking ring. Fix stator coupling to prevent housing rotation. Connect shielded encoder cable to interpolation or CNC control unit. Adjust mounting alignment, lock all fasteners. Restore power, run signal amplitude test and reference mark detection test.

Interface

Interface list: 14-pin double-row locking connector, 5VDC power and ~1.05Vpp measuring signal terminals, no LED indicators on ERN1387.035.

Diagnostic

Troubleshooting: No measuring signal: Check 5V power supply, cable breakage or connector pin contact. Reference mark cannot be detected: Optical window contamination or shaft misalignment. Intermittent signal fluctuation: Vibration, loose taper locking ring or bearing deterioration.

Product Brief

Brief description: ERN1387.035 HEIDENHAIN bearing-integrated incremental rotary encoder with 1:10 tapered shaft,2048 lines and ~1.05Vpp sine/cosine output,used for spindle and servo motor angular position and speed measurement of heavy CNC boring mill,rotary encoder spare.