Product Information

ECN 1325
EQN 1337
Absolute Rotary Encoders
with Tapered Shaft for
Safety-Related Applications
For HMC 2 connection
technology

01/2023

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

Specifications

ECN 1325 singleturn

Functional safetyfor 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 range1)

PFH 20 · 10–9 (probability of dangerous failure per hour)

Safe position2)

Encoder: ±2.12° (safety-related measuring step: SM = 0.7°)
Mechanical coupling: ±2° (fault exclusion for the loosening of the shaft coupling and stator coupling,
designed for accelerations  300 m/s2)

Interface

EnDat 3

Ordering designation

E30-R2

Position values per revolution

33 554 432 (25 bits)

Revolutions–XEL.time HPFout data rate

 11 μs at 12.5 Mbit/s;  8.2 μs at 25 Mbit/s

System accuracy±20”

Electrical connection

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

Cable length

At 12.5 Mbit/s:  100 m; at 25 Mbit/s:  40 m

Supply voltage

DC 4 V to 14 V (recommended: 12 V)

2

Product Information ECN 1325, EQN 1337   01/2023

4096 (12 bits)

3)

Power consumption4) (maximum) At 4 V:  700 mW; at 14 V:  750 mW

At 4 V:  800 mW; at 14 V:  850 mW

Current consumption (typical)

At 12 V: 30 mA (without communication)

At 12 V: 40 mA (without communication)

Shaft

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

Shaft speed 15 000 rpm

Starting torque at 20 °C

 0.01 Nm

Moment of inertia of rotor

2.6 · 10–6 kgm2

Angular acceleration of rotor 1 · 105 rad/s2

Natural freq. of stator coupling

1800 Hz (typical)

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 exceededtemperature error message

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

Relative humidity

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

Protection rating EN 60529

IP40 (read about insulation under Electrical safety in the Interfaces of HEIDENHAIN Encoders
brochure; contamination from the ingress of fluids must be avoided)

Mass 0.3 kg

Part number

ID 1296522-01/-53

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 header (12+4-pin)
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

EQN 1337 multiturn1)

 12 000 rpm

6)	For use at  2000 m above sea level( 6000 m above sea level upon request)2)	Further tolerances may arise in the downstream electronics
after position value comparison (contact the manufacturer)3)	See Temperature measurement in motors in theEncoders for Servo Drives brochure
Product Information ECN 1325, EQN 1337   01/2023

ID 1296523-01/-536)4)	See General electrical information in the Interfaces ofHEIDENHAIN Encoders brochure5)	Valid as per standard at room temp.; at operating temps.
of up to 100 °C:  300 m/s2; up to 115 °C:  150 m/s26)
In collective package upon request3

MountingIntegrated temperature evaluation

The tapered shaft of the rotary encoder
is pressed onto the measured shaft andfastened with a central screw. It isparticularly important to ensure that thepositive-locking element of the stator
coupling securely engages thecorresponding slot in the measured shaft.
Use a screw with material bonding antirotation lock (see Mounting accessories).
The stator coupling is clamped by meansof an axially tightenable screw in a locatinghole.

This rotary encoder features an internal temperature sensor integrated into the encoder
electronics and an evaluation circuit for an external temperature sensor. In both cases,
the respective digitized temperature value is transmitted purely serially over the EnDat
protocol. Please bear in mind that neither the temperature measurement nor thetransmission of the temperature value is safe in terms of functional safety. With regard
to the internal temperature sensor (FID 0x21 SENSOR_TEMP_INT), the rotary encodersupports the two-stage cascaded signaling of a temperature exceedance. It consists of an
EnDat warning and an EnDat error message. In compliance with the EnDat specification,
when the temperature reaches the warning threshold for temperature exceedance of theinternal temperature sensor, an EnDat warning is issued (HPF.STATUS.W "collectivewarning bit"). In addition, bit 26 (W10) "Temperature warning threshold exceeded" is set
in the LPF with the FID=ERRMSG. This warning threshold for the internal temperature
sensor is stored in the parameter SET.tempWarnLevel and can be individually adjusted.
A device-specific default value is saved here before shipping. The temperature measured
by the internal temperature sensor is higher by a device-specific and application-specificamount than the temperature at measuring point M1, as shown in the dimension
drawing.

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 aluminumapply.
Also comply with the other material
properties in the Encoders for Servo
Drives brochure (ID 208922-xx).

The encoder features a further, albeit non-adjustable trigger threshold for the EnDat error
message (HPF.STATUS.F "collective error bit"). In addition, bit 8 (A8) "Permissible ambientconditions exceeded" is set in the LPF with the FID=ERRMSG. This trigger threshold mayvary depending on the encoder model and is stated in the specifications. HEIDENHAIN
recommends adjusting the warning threshold based on the application such that thisthreshold is sufficiently below the trigger threshold for the “Temperature exceeded”
EnDat error message. Compliance with the operating temperature at measuring point M1
is required for adherence to the encoder’s intended and proper use.

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-M5×50-8.8-MKL

1)

Lot size
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 ServoDrives 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
EnDat 3 adapter (SA 1210)
Adapter for connecting an encoder with EnDat 3 (E30-R2) to the PWM 21ID 1317260-01
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.

4Product Information ECN 1325, EQN 1337   01/2023

Product Information ECN 1325, EQN 1337   01/2023

5Electrical connection

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

12Power supply / Serial data transfer

Other signals

122b5a//

4//

1a1b

P_SD+

P_SD–1)

T+2)

T–2)

VioletYellowBrownGreen1)

1)

Supply voltage and data: P_SD+ contains UP (power supply); P_SD– contains 0 V	Connections for external temperature sensor; evaluation optimized for KTY 84-130, PT 1000, and others;(see Temperature measurement in motors in the Encoders for Servo Drives brochure)2)

Vacant pins or wires must not be used!

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

1381581 · 00 · A · 02 · 01/2023 · 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:• Operating Instructions				
1380033-xx
For more information about EnDat 3, visit: www.endat.de
For brochures and Product Information documents, visit: www.heidenhain.com