HEIDENHAIN EQN 1325 Absolute Rotary Encoder

Technical Specifications

Model：EQN 1325 Brand：HEIDENHAIN Product Type: Bearing-integrated multiturn absolute optical rotary encoder

Module Feature

Function: HEIDENHAIN EQN 1325 is multiturn absolute rotary encoder equipped with built-in precision bearing. It delivers EnDat01 multi-turn absolute position data and ~1Vpp sine/cosine A/B/Z incremental measuring signals, optional 512 / 2048 lines per revolution. It adopts 9.25mm 1:10 tapered shaft, fitted with M10 and M6 withdrawal thread for convenient disassembly. 8192 positions per single turn, supports up to 4096 distinguishable revolutions, max mechanical rotational speed up to 15000 rpm, operating temperature range -40℃ ~ +115℃. Widely used on heavy horizontal boring mills, machining centers and robot servo motors for spindle and servo motor closed-loop angular position & speed measurement.

Measuring principle: Absolute optical scanning + incremental sinusoidal signal Incremental lines: 512 / 2048 lines per revolution (selectable) Interface: EnDat 01 Output Signal: ~1 Vpp sine/cosine incremental signals Shaft specification: 1:10 tapered shaft, functional diameter 9.25mm, M10/M6 back-off thread Singleturn positions: 8192 positions per revolution Differentiable revolutions: 4096 turns Onboard components: Optical grating disc, scanning assembly, built-in bearing, metal housing,16-pin double-row locking 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: 1:10 tapered shaft fitted onto motor rotor Protection class: IP40 (housing)

Environmental

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

System compatibility

Compatibility description: EQN1325 series rotary encoder works with HEIDENHAIN EnDat controller and drives supporting 1Vpp sinusoidal input. Suitable for Fives Giddings & Lewis PIC900 CNC heavy boring mill spindle and feed axis.

Function

Function description: EQN 1325 is multiturn absolute rotary encoder manufactured by HEIDENHAIN. It can read absolute multi-turn angular position directly after power-on without axis homing. The ~1Vpp sine/cosine incremental signals support electronic interpolation to achieve ultra-high resolution for high dynamic motion control. 1:10 taper shaft and expanding ring locking structure ensures reliable torque transmission. Withdrawal thread simplifies encoder removal from motor rotor during maintenance. Compact metal housing resists cutting fluid, dust and workshop vibration. 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 expanding locking ring. 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: 16-pin double-row locking connector, 3.6~14VDC power and measuring signal terminals, no LED indicators on EQN 1325.

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 taper locking ring, bearing wear or cable abrasion.

Product Brief

Brief description: EQN 1325 HEIDENHAIN bearing-integrated multiturn absolute rotary encoder with 1:10 tapered shaft,M10/M6 back-off thread,8192 singleturn positions,4096 multiturn range,2048 lines and ~1.05Vpp sine/cosine output,EnDat01 interface,used for spindle and servo motor angular position and speed measurement of heavy CNC boring mill,rotary encoder spare.