Product Information

ECN 425
EQN 437
Absolute Rotary
Encoders with Tapered
Shaft and Expanding
Ring Coupling for SafetyRelated Applications

09/2019

ECN 425, EQN 437
Rotary encoders for absolute position values with safe singleturn information• 65 mm installation diameter• 07B expanding ring coupling• 65B tapered shaft• IP64 rating

Required mating dimensions

 = Bearing of mating shaft
M 1 = M easuring point for operating temperature
M 2 = M easuring point f or vibrat ion, see D 741714
1 = Clamping screw for coupling ring, w idth A/F 2, tightening torque: 1.25 Nm –0.2 Nm
2 = Screw plug, widths A/F 3 and 4, tightening torque: 5 Nm +0.5 Nm
3 = Screw: DIN 6912 – M5x50-08.8 – MKL, width A/F 4, tightening torque: 5 Nm +0.5 Nm
4 = M10 back-off thread
5 = M6 back-off thread
6 = Compensation of mounting tolerances and thermal expansion; no dynamic motion permitted
7 = Chamfer at start of thread is obligatory for material bonding anti-rotation lock
8 = Direction of shaft rotation for ascending position values

Specifications

ECN 425 – Singleturn

EQN 437 – Multiturn

Functional safety
for applications up toAs single-encoder system for monitoring functions• SIL 1 as per EN 61508 (further basis for testing: EN 61800-5-2)• Category 2, PL c as per EN ISO 13849-1:2015
As single-encoder system for closed-loop functions• SIL 2 as per EN 61508 (further basis for testing: EN 61800-5-2)• Category 3, PL d as per EN ISO 13849-1:2015
Safe in the singleturn rangePFH≤ 10 · 10 –9 (probability of dangerous failure per hour)

Safe position 1)

Encoder: ±1.76° (safety-related measuring step: SM = 0.7°)
Mechanical coupling: ±2° (fault exclusion for the loosening of shaft and stator coupling, designed foraccelerations ≤ 300 m/s 2 )Interface

EnDat 2.2

Ordering designation

EnDat22

Position values per revolution

33 554 432 (25 bits)

Revolutions-Calculation time tcal
Clock frequency≤ 7 µs≤ 8 MHz

System accuracy±20"

Electrical connection

Cable (1 m) with 8-pin M12 coupling (male)

Cable length≤ 100 m (see the EnDat description in the Interfaces of HEIDENHAIN Encoders brochure)Supply voltage

DC 3.6 V to 14 VPower consumption 2) (max.)

At 3.6 V: ≤ 600 mW; at 14 V: ≤ 700 mW

At 3.6 V: ≤ 700 mW; at 14 V: ≤ 800 mW

Current consumption (typical)

At 5 V: 85 mA (without load)

At 5 V: 105 mA (without load)

Shaft

65B tapered shaft Ø 9.25 mm; taper 1:10

Shaft speed≤ 15 000 rpm

Starting torque at 20 °C (typical)

0.01 Nm

Moment of inertia of rotor

2.6 · 10 –6 kgm 2

Angular acceleration of rotor≤ 1 · 10 5 rad/s 2

Natural frequency of stator coupling≥ 1800 Hz

Axial motion of measured shaft≤ ±0.5 mm

Vibration 55 Hz to 2000 Hz
Shock 6 ms

≤ 300 m/s 2 (EN 60068-2-6); 10 Hz to 55 Hz constant over 4.9 mm peak to peak
≤ 2000 m/s 2 (EN 60068-2-27)

Min. operating temperature

Stationary cable: –40 °C; moving cable: –10 °C

Max. operating temperature

100 °C

Trigger threshold of error message
for temperature exceedance

125 °C (measuring accuracy of the internal temperature sensor: ±4 K)

Relative humidity≤ 93 % (40 °C/21 d as per EN 60068-2-78); without condensation

Protection class EN 60529

IP64 (read about insulation under General mechanical information in the Interfaces of HEIDENHAIN
Encoders brochure; contamination from the ingress of liquids must be prevented)

Mass≈ 0.25 kg

ID numberID 678920-02

1)
2)4096 (12 bits)≤ 12 000 rpm

ID 678922-02

Further tolerances may arise in subsequent electronics after pos. value comparison (contact manufacturer of subsequent electronics)
See General electrical information in the Interfaces of HEIDENHAIN Encoders brochureMounting

The tapered shaft of the rotary encoder is slid onto the measured shaft and fastened witha central screw. It is particularly important to ensure that the positive-locking element of thestator coupling securely engages the corresponding slot in the measured shaft. Use a screw
with material bonding anti-rotation lock (see Mounting accessories). The stator coupling isclamped by an axially tightened screw in a location hole.
Requirements on the motor side for safe mechanical coupling:
Mating shaft

Mating stator

Material

Steel

AluminumTensile strength Rm≥ 600 N/mm 2≥ 220 N/mm 2Interface pressure PG≥ 500 N/mm 2≥ 200 N/mm 2

Surface roughness Rz≤ 16 µm

Coefficient of thermal expansion αtherm 10 · 10 –6 K –1 to17 · 10 –6 K –1

≤ 25 · 10 –6 K –1

For the design of the mechanical fault exclusion for the shaft connection, the following
maximum torque Mmax must be considered:
Mmax = 1.0 Nm
The customer’s mechanical design must ensure that the maximum torque Mmax occurring in
the application can be transmitted.

Mounting accessories
ScrewsScrews (central screw, mounting screws) are not included in delivery and can be orderedseparately.
ECN 425, EQN 437

Screws 1)

Central screwfor shaft fastening

DIN 6912 – M5×50-08.8 – MKL1)

Quantity
ID 202264-54 10 or 100

With coating for material bonding anti-rotation lockFor further mounting information and mounting aids, please refer to the relevant
mounting instructions and the Encoders for Servo Drives brochure. The mounting canbe tested with the PWM 21 and the ATS software.

Electrical connection

Cables with M12 connecting elements
PUR connecting cables and adapter cables Ø 6 mm; 2 × (2 × 0.09 mm²) + 2 × (2 × 0.16 mm 2 ); AP = 2 × 0.16 mm 2Connecting cable with 8-pin M12 connector(female) and 8-pin M12 coupling (male)

ID 1036372-xx

Adapter cable with 8-pin M12 connector (female)and 15-pin D-sub connector (female)

ID 1036521-xx

Adapter cable with 8-pin M12 connector (female)and 15-pin D-sub connector (male)

ID 1036526-xx

Connecting cable with 8-pin M12 connector(female) and unstripped cable end

ID 1129581-xx 1)

AP:1)

Cross section of power supply lines
Connecting element must be suitable for the maximum clock frequency used

Conformity with the EMC Directive must be ensured for the complete system!
Note for safety-related applications: Document the bit error rate in accordance with Specification 533095!

Pin layout
8-pin M12 couplingPower supply

Absolute position values

82513476UPSensor UP0VSensor 0 VDATADATA

CLOCK

CLOCK

Brown/GreenBlue

White/GreenWhite

GrayPink

VioletYellow

Cable shield connected to housing; Up = Power supply
Sensor: The sense line is connected in the encoder with the corresponding power supply.
Vacant pins and wires must not be used!
Note for safety-related applications: Only completely assembled HEIDENHAIN cables are qualified. Do not modify cables or exchange
their connectors without first consulting with HEIDENHAIN Traunreut.
SpeedTEC is a registered trademark of TE Connectivity Industrial GmbH

896586 · 03 · A · 01 · 09/2019 · PDF

This Product Information document supersedes all previous editions, which thereby
become invalid. The basis for ordering from HEIDENHAIN is always the Product
Information document edition valid when the order is made.
Further information: Comply with the requirements described in the following
documents to ensure correct operation of the encoder:• Brochure: Encoders for Servo Drives
208922-xx• Brochure: Interfaces of HEIDENHAIN Encoders
1078628-xx• Brochure: Cables and Connectors
1206103-xx• Mounting instructions: ECN 425, EQN 437
727583-xx• Technical Information document: Safety-Related Position Measuring596632-xx
Systems• For implementation in a safe control or inverter: Specification
533095-xx