Product Information

ECN 1325
EQN 1337
Absolute Rotary Encoders
with Tapered Shaft for
Safety-Related Applications
ID 1178026-03
ID 1178026-53
ID 1178027-01
ID 1178027-53

05/2022

ECN 1325, EQN 1337
Rotary encoders for absolute position feedback with safe singleturn information• 65 mm installation diameter• 07B expanding ring coupling• 65B tapered shaft

Required mating dimensions

A = Bearing of mating shaft
M1 = Measuring point for operating temperature
M2 = Measuring point for vibration (see D741714)
1 = Clamping screw for coupling ring: width A/F 2; tightening torque: 1.25 Nm –0.2 Nm
2 = Die-cast cover
3 = Screw plug: widths A/F 3 and 4; tightening torque: 5 Nm +0.5 Nm
4 = 16-pin (12+4-pin) header
5 = Screw: DIN 6912 – M5x50 – 08.8 – MKL; width A/F 4; tightening torque: 5 Nm +0.5 Nm
6 = M10 back-off thread
7 = Compensation of mounting tolerances and thermal expansion; no dynamic movement permitted
8 = Chamfer at start of thread is mandatory for material bonding anti-rotation lock
9 = Direction of shaft rotation for ascending position values

2

Product Information ECN 1325/EQN 1337   05/2022

Specifications

ECN 1325 singleturn

Functional safety
for applications with up toAs a single-encoder system for monitoring functions and closed-loop functions• SIL 2 as per EN 61508 (further basis for testing: IEC 61800-5-3)• Category 3, PL d, according to EN ISO 13849-1:2015
Safe in the singleturn rangePFH1)

 10 · 10–9 (probability of dangerous failure per hour)

Safe position2)

Encoder: ±1.76° (safety-related measuring step: SM = 0.7°)
Mechanical coupling: ±2° (exclusion for loosening of shaft and stator coupling,
designed for accelerations of  300 m/s2)

Interface/ordering designation

EnDat 2.2 / EnDat22

Position values per revolution

33 554 432 (25 bits)

Revolutions–Calculation time tcal/clock frequency

 7 µs/ 16 MHz

System accuracy at 20 °C±20“Supply voltage

DC 3.6 V to 14 V

Power consumption (maximum)

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: 80 mA (without load)

At 5 V: 95 mA (without load)

Electrical connection

PCB connector: 16-pin (12+4-pin), with connection for external temperature sensor3)

Cable length4)

 100 m (at clock frequency ≤ 8 MHz) 20 m (at clock frequency ≤ 16 MHz)

Shaft

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

Permissible shaft speed 15 000 rpm

Starting torque at 20 °C (typical)

 0.01 Nm

Moment of inertia of rotor

2.6 · 10–6 kgm2

Angular acceleration of rotor 1 · 105 rad/s2

Natural frequency fN (typical)≥ 1800 Hz

Permiss. axial motion of measured shaft

 ±0.5 mm

Vibration 55 Hz to 2000 Hz
Shock 6 ms

 300 m/s2 5) (EN 60068-2-6); 10 Hz to 55 Hz constant over 4.9 mm peak to peak
 2000 m/s2 (EN 60068-2-27)

Operating temperature–40 °C to 115 °C

Trigger threshold for exceeded6)
temperature error message

125 °C (measuring accuracy of the internal temperature sensor: ±1 K)

Relative humidity

 93% (40 °C/21 d as per EN 60068-2-78), condensation excluded

Protection EN 60529

IP40 (read about insulation under Electrical safety in the Interfaces of HEIDENHAIN
Encoders brochure; contamination through the ingress of liquids must be avoided)Mass 0.25 kg

ID number1178026-037)
1178026-531)	For use at ≤ 2000 m above sea level(≤ 6000 m above seal level upon request)2)	Further tolerances may arise in the downstream electronics
after position value comparison (contact the manufacturer)3)	Connectable temperature sensor for rotary encoders:
KTY 84-130 or PT 1000 (see Temperature measurement inmotors in the Encoders for Servo Drives brochure)
Product Information ECN 1325/EQN 1337   05/2022

EQN 1337 multiturn4096 (12 bits)

 12 000 rpm

1178027-011178027-537)4)	See the EnDat description in the Interfaces of HEIDENHAIN Encodersbrochure5)	Valid at room temperature in accordance with the standard; at operating
temperatures of up to 100 °C: ≤ 300 m/s2; up to 115 °C: ≤ 150 m/s2(≥ 100 °C: 10 Hz to 55 Hz constant over 2.45 mm peak to peak)6)	The internal temperature evaluation is not designed with functionalsafety7)
In collective package upon request3

MountingElectrical connection

The tapered shaft of the rotary encoder is pressed onto the measured shaft and fastenedwith a central screw. It is particularly important to ensure that the positive-locking elementof the stator coupling securely engages the corresponding slot in the measured shaft. Usea central screw with material-bonding anti-rotation lock (see Mounting accessories). The
stator coupling is clamped by means of an axially tightenable screw in a locating hole.

Pin layout
16-pin (12+4-pin) PCB connector
12ba4123456

12Power supply
More information:
For the customer-side mounting
design, the material specifications forsteel apply to the customer-side shaft.
For the customer-side stator, thematerial specifications for aluminum
apply.
Also comply with the other material
properties in the Encoders for ServoDrives brochure (ID 208922-xx).

12+41)
2)

1)

Serial data transmission

Other signals

1b6a4b3a6b1a2b5a1a2)

1b 2)

2a/2bUPSensor
UP0V

Sensor
0V

DATA

DATA

CLOCK

CLOCK

T+T–/

Only for adapter cables inside the motor housing
Connections for an external temperature sensor (see Temperature measurement in motors in the Encoders for Servo Drives brochure)

Cable shield connected to housing; UP = Power supply voltage; T = Temperature
Sensor: The sense line is connected in the encoder with the corresponding power line.
Vacant pins or 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!

Mounting accessories
ScrewsScrews (central screw, mounting screws) are not included in delivery and can be orderedseparately.
1)

ECN 1325, EQN 1337

ScrewsCentral screwfor shaft fastening

DIN 6912 – M5×50 – 08.8 – MKL1)

Quantity
ID 202264-54

10 or 100

With coating for material bonding anti-rotation lock

Please note the information on screws from HEIDENHAIN in the Encoders for Servo
Drives brochure, under the heading Screws with material bonding anti-rotation lockin the chapter General mechanical information.
Mounting aid
To avoid damage to the cable, use the mounting aid to connect and disconnect the cable
assembly. The pulling force must be applied solely to the connector and not to the wires.
ID 1075573-01
For more mounting information and mounting aids, see the Mounting Instructions
and the Encoders for Servo Drives brochure. The mounting quality can be inspectedwith the PWM 21 and ATS software.

DR. JOHANNES HEIDENHAIN GmbH
Dr.-Johannes-Heidenhain-Str. 583301 Traunreut, Germany +49 8669 31-0
 +49 8669 32-5061
info@heidenhain.dewww.heidenhain.com

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Product Information ECN 1325/EQN 1337   05/2022

1378230 · 00 · A · 02 · 05/2022 · 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 placed.

More information:Comply with the requirements described in the following documents to ensure correctand intended operation:• Brochure: Encoders for Servo Drives					 208922-xx• Brochure: Cables and Connectors 						1206103-xx• Brochure: Interfaces of HEIDENHAIN Encoders			1078628-xx• Operating Instructions							1378812-xx• Mounting Instructions: ECN 1325, EQN 1337 			1378983-xx• Technical Information: Safety-Related Position Measuring Systems	 596632-xx• For implementation in a safe control or inverter: Specification document	 533095-xx