HeidenhainROD 426 Incremental Rotary Encoder, 5000 Lines, TTL 5 V, 6 mm Solid Shaft, M23 12-Pin, IP67

Product Description

What this part is

A Heidenhain ROD 426 incremental rotary encoder with integral bearing, ordered at 5000 lines per revolution with the TTL interface. It is a shaft-mounted feedback device: rotation of the shaft produces two square-wave channels in quadrature plus a once-per-revolution reference mark, from which the drive, counter or CNC derives position, direction and speed.

Decoding the order code

ROD: rotary encoder, incremental, with integral bearing and solid shaft for a separate shaft coupling. 426: the TTL member of the ROD 400 family. Its siblings are the ROD 466 (HTL, 10-30 V), the ROD 436 (HTL) and the ROD 486 (1 Vpp). Heidenhain’s ID series for the ROD 426 is 376846-xx, which matches the 376-846-03 marked on this unit. 5000: line count, that is, 5000 signal periods per revolution before any external evaluation. S12: the M23 12-pin flange socket electrical connection.

Resolution and speed

5000 lines is one of the higher native counts in the ROD 400 range and gives 20 000 measuring steps per revolution after the four-fold edge evaluation most subsequent electronics perform. Mechanical permissible speed: 16 000 rpm. Scanning frequency: 300 kHz, which at 5000 lines corresponds to approximately 3600 rpm. Typical duty is a ballscrew, a rotary table, a feed axis or a line-shaft measuring wheel.

Interface

The TTL interface is an RS-422 differential line driver, so the encoder sends each channel and its inverse, supporting 100 m of shielded cable in a noisy cabinet. A fault-detection signal goes LOW on a broken supply line or a failed light source.

Published specifications

Type: incremental rotary encoder with integral bearing, ROD 400 series. Line count: 5000 per revolution. Measuring steps after 4-fold evaluation: 20 000 per revolution. Interface: TTL square-wave, two channels Ua1 / Ua2 at 90° elec. plus inverted signals, per EIA RS-422 differential line driver. Reference mark: one. Fault-detection signal: one TTL pulse, LOW on fault and HIGH on proper function. Voltage supply: 5 V DC ±0.5 V. Current consumption without load: 120 mA. Scanning frequency: 300 kHz. Minimum edge separation: 0.39 µs. System accuracy: 1/20 of the grating period. Shaft: 6 mm solid shaft, for separate rotor coupling. Mechanical permissible speed: 16 000 rpm. Starting torque: 0.01 Nm at 20 °C. Moment of inertia of rotor: 2.7 x 10-6 kgm². Permissible shaft load: axial 40 N, radial 60 N at shaft end. Electrical connection: M23 12-pin flange socket. Vibration: 300 m/s², 55 Hz to 2000 Hz (EN 60068-2-6). Shock: 2000 m/s², 6 ms (EN 60068-2-27). Operating temperature: -40 to 100 °C, with a -10 °C minimum where the cable moves. Protection: IP67 at the housing, IP64 at the shaft inlet, per EN 60529. Mass: approximately 0.3 kg. Mounting: synchro flange. Heidenhain ID: 376846-03.

Mounting data

Mounting: synchro flange. Shaft: 6 mm solid, for a separate shaft coupling. Permissible shaft load: axial 40 N, radial 60 N at shaft end. Supply tolerance: 5 V ±0.5 V measured at the encoder, with sensor lines available for a remote-sense supply. Maximum cable length: 100 m for the incremental channels, 50 m for the fault-detection signal. Mass: approximately 0.3 kg.

Quantity and configuration

One encoder.

Interchange guidance

Within the family, the ROD 466 and ROD 436 are HTL 10-30 V units and the ROD 486 is 1 Vpp. They share the 6 mm shaft and the same mechanical envelope, and the output signals differ. Line count matches the control’s configuration: a 2500-line ROD 426 halves the resolution of a 5000-line one. Also written ROD426, ROD 426.5000, ROD-426-5000-02S12-03, 376846-03, 376-846-03 and ID 376846.