HEIDENHAIN ERN1387 Rotary Encoder

Technical Specifications

Model： ERN1387, ID.Nr.385 488-07

Brand： HEIDENHAIN

Product Type: Bearing integrated incremental hollow shaft rotary encoder for CNC spindle

Module Feature:

Function: HEIDENHAIN ERN1387 incremental rotary encoder. It measures spindle rotation speed and angular position, outputs 1Vpp sine/cosine incremental signals. Integrated stator coupling for direct mounting on motor spindle. Widely used for spindle closed-loop control on heavy horizontal boring mills and large machining centers.

Measuring principle: Incremental optical scanning Line count: 2048 lines per revolution Output Signal: 1 Vpp sine/cosine incremental signals Hollow shaft with integrated stator coupling Onboard components: Metallic grating disc, optical scanning assembly, precision bearing, aluminum housing, molded cable connector

LED indicators: POWER, SIG, FAULT diagnostic lights

Hardware self-diagnosis: Encoder signal amplitude monitoring, optical signal integrity inspection

Programming software: HEIDENHAIN diagnostic software for signal status check

Electrical Parameters

Supply voltage: 5VDC ±10%

Power consumption: Max 2.8W

Mechanical & Structure:

Mounting: Hollow shaft fitted directly onto spindle shaft with stator coupling Protection class: IP64 (housing)

Environmental:

Operating temperature: -20℃ ~ +80℃

Ambient humidity: 5~85% non-condensing

Certification: CE

Status: HEIDENHAIN spindle incremental rotary encoder

System compatibility

Compatibility description: ERN1387 belongs to HEIDENHAIN ERN series rotary encoder family,1Vpp sinusoidal output. Compatible with HEIDENHAIN EXE interpolation units and Fives Giddings & Lewis PIC900 CNC system for heavy boring mill spindle axis.

Function

Function description: ERN1387 is incremental rotary encoder manufactured by HEIDENHAIN. Integrated stator coupling eliminates separate flexible coupling, reduces mechanical backlash. It generates high-resolution sine/cosine analog signals for spindle speed and orientation measurement. Robust metal housing protects optical components from vibration, coolant mist and metal chips. Reference mark pulse is required for spindle orientation homing after power-up. It is high precision spindle position measuring spare for heavy CNC boring mills.

Installation

Installation steps: Follow lockout/tagout safety procedure before installation. Cut off encoder 5VDC power. Mount encoder onto spindle hollow shaft, clamp axial and radial position correctly. Connect shielded encoder cable to HEIDENHAIN EXE interpolation unit. Restore power, verify POWER and SIG LED indicators, run encoder diagnostic and test spindle orientation.

Interface

Interface list: Multi-core molded cable connector, 5VDC power and 1Vpp signal terminals,on-board POWER / SIG / FAULT LED indicators for HEIDENHAIN ERN1387 385 488-07.

Diagnostic

Troubleshooting: No spindle feedback signal: Check 5VDC supply voltage, cable breakage or connector pin damage. FAULT LED lit: Low signal amplitude, optical contamination or shaft mounting misalignment. Spindle orientation failure: Shaft runout, coupling slippage or aging optical components.

Product Brief

Brief description: 385 488-07 HEIDENHAIN ERN1387 hollow-shaft incremental rotary encoder with 2048 lines and 1Vpp output,provides spindle speed and angular position feedback for heavy CNC boring mill spindle closed-loop control,spindle encoder spare.