Product Information

ECN 1123
EQN 1135
Absolute Rotary Encoders
with 1KA Positive-Locking
Hollow Shaft for SafetyRelated Applications

01/2023

ECN 1123, EQN 1135
Rotary encoders for absolute position values with safe singleturn information• 75A mounted stator coupling• 1KA blind hollow shaft ( 6 mm) for axial clamping

Specifications

ECN 1123 singleturn

EQN 1135 multiturn

Functional safety
for applications with up toAs a single-encoder system for monitoring functions• SIL 1, as per EN 61508 (further basis for testing: IEC 61800-5-3)• 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: IEC 61800-5-3)• Category 3, PL d, in accordance with EN ISO 13849-1:2015
Safe in singleturn operation
 15 · 10–9 (probability of dangerous failure per hour)

PFH1)

Safe position

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

8 388 608 (23 bits)

Revolutions–1312114096 (12 bits)

Calculation time tcal/clock frequency ≤ 7 μs/≤ 8 MHz14

 3.5 ± 0.1–0.3≥ 3.55

3 +0.10

 36.8E7

43

≥

9.4



+0.3



≥ 11

≥ 2.3–0.2



0.06 B 0.06 A()40L2  E1  E2 E3L3  E4 E5 E6 E7
0.05 A
0.1 A

0.01 A

2.3 ± 0.1

E4 E5 E6 E790°...120°

0.05 A+0.2

2 ± 0.1

M32G10 0.1 DM32x

0.02 A 6g7≥9 E2 E3
 E1

 9.3 ≤ D ≤  14

Required mating dimensions

Encoder Encoder
flange/ Encoder
Geberﬂansch/
Baureihe
L2L3Series Gebername Statorkupplung Geberwelle Schnittstelle
Interfacename
stator coupling
shaft
EnDat01/22 2 ± 0.5–
E1
ECN/EQN
75A
1KA
DQ01
EnDat22/2 ± 0.4
1KA/82A
70C
ECI/EQI–
E2/E3
E30-R2
EnDat22/
E4/E6
ECI/EQI
70F
82A
0±0.4
–
E30-R270F–
E5
EnDat01
0 ± 0.3
82A
ECI/EQI
EnDat22–82C
0 ± 0.3
ECI/EBI70E
E71.6 ± 0.1

≤ 0.445°≤  7.5

A = Bearing of mating shaft
M1 = Measuring point for operating temperature
M2 = Measuring point for vibration
1 = Contact surface of slot
2 = Chamfer at start of thread is mandatory for material bonding anti-rotation lock3 = Shaft surface; ensure full-surface contact!
4 = Slot required only for ECN/EQN and ECI/EQI with WELLA1 = 1KA
5 = ExI flange surface; ensure full-surface contact!
6 = Coupling surface of ECN/EQN
7 =	Maximum permissible deviation between the shaft surface and coupling surface;compensation of mounting tolerances and thermal expansion,of which ±0.15 mm of dynamic axial motion is permitted
8 =	Maximum permissible deviation between shaft and flange surfaces;
compensation of mounting tolerances and thermal expansion
9 = Undercut
10 = Possible centering hole
11 = 15-pin PCB connector
12 = Fastening for cable with crimp sleeve (diameter: 4.3 mm ±0.1 mm; 7 mm long)
13 = Positive locking element; ensure correct engagement in Slot 4 (e.g., by measuring the device overhang)
14 = Direction of shaft rotation for ascending position values
15 = Uncoated; shaft coating not permitted

2System accuracy at 20 °C±60”

Supply voltage

DC 3.6 V to 14 V2)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: 85 mA (without load)

At 5 V: 105 mA (without load)

Electrical connection

15-pin PCB connector (with connection for external temperature sensor )Cable length≤ 100 m (see EnDat description in the Interfaces of HEIDENHAIN Encoders brochure)Shaft

1KA blind hollow shaft ( 6 mm) with positive-locking element

Shaft speed≤ 12 000 rpm

Starting torque (typical)≤ 0.001 Nm (at 20 °C)

Moment of inertia of rotor

0.4 · 10Angular acceleration of rotor≤ 0.8 · 105 rad/s2

Natural frequency fN (typical)≥ 1000 Hz

Axial motion of measured shaft≤ ±0.5 mm

Vibration 55 Hz to 2000 Hz
Shock 6 ms

≤ 200 m/s (EN 60068-2-6); 10 Hz to 55 Hz constant over 3.2 mm peak to peak
≤ 2000 m/s2 (EN 60068-2-27)

Operating temperature–40 °C to 110 °C

Trigger threshold for4)
temperature exceedance

125 °C (measuring accuracy of the internal temperature sensor: ±5 K)

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

Protection 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 0.1 kg

ID number743586-01
743586-51 (collective packaging)

≤ 0.7

10

 4.5 ± 0.1

15 3.2 ± 0.1

60°

ECN 1123/EQN 1335 Product Information    01/20233)–6≤ 0.002 Nm (at 20 °C)

kgm2

2743587-01
743587-51 (collective packaging)

1)

Further tolerances may arise in the downstream electronics after position value comparison (contact mfr.)
See General electrical information in the Interfaces of HEIDENHAIN Encoders brochure3)
Evaluation optimized for KTY 84-130 (see Temperature measurement in motors in the Encoder for Servo Drives brochure)4)
The internal temperature evaluation is not designed for functional safety2)

ECN 1123/EQN 1335 Product Information    01/2023

3

MountingElectrical connection

The blind hollow shaft of the rotary encoder is seated onto the measured shaft andfastened with a central screw. It is particularly important to ensure that the positive-locking
element of the rotary encoder shaft securely engages the corresponding slot in themeasured shaft. Mounting on the stator side is performed without a centering collar on aflat surface with two clamping screws. Use screws with material bonding anti-rotation
lock (see Mounting accessories).

Cables
Output cables inside the motor housing
TPE 10 × 0.16 mm2 1) 2)

With 15-pin PCB connector and 8-pin M12 flange
socket (male); TPE wires in braided sleeve andwires for a temperature sensor

ID 1117412-xx

With 15-pin PCB connector; ¬ 3.7 mm EPG(with shield crimping ¬ 4.5 mm) and wires
for temperature sensor

EPG 1 × (4 × 0.06 mm2) +4 × 0.06 mm2 2)
TPE 2 × 0.16 mm2
ID 1108078-xx

1)
2)

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

Lot size

ScrewsCentral screw for ECN 1123 ISO 4762-M3×22-8.8-MKLID 202264-65

Central screw for EQN 1135 ISO 4762-M3×35-8.8-MKL

ID 202264-66

Fastening screw for flange

ID 202264-871)

ISO 4762-M3×10-8.8-MKL

10 or 100

20 or 200

With coating for material bonding anti-rotation lock

Wires with braided sleeve he shield connection must be implemented on the motor
TInformation for safety-related applications: Document the bit error rate in accordance with Specification 533095!

More information:
For the customer-side mounting design,
the material properties and conditions inaccordance with the General mechanicalinformation in the Encoders for ServoDrives brochure (ID 208922-xx) must becomplied with.

Pin layout
15-pin PCB connector

The material specifications for aluminumand steel apply both to the customer-side
shaft and stator.

Power supply

Please note the information on screws from HEIDENHAIN in the Encoders for Servo
Drives brochure, under the heading Screws with material bonding anti-rotation lock in thechapter 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.

1)
2)

ID 1075573-01
Mounting aidThe mounting aid allows the shaft of the rotary encoder to be turned from the rear of thedevice, making it easy to find the positive-locking connection between the encoder shaft
and the measured shaft.
ID 821017-03

1114127891056UPSensor UP0VSensor 0 V

DATA

DATA

CLOCK

CLOCKT+2)

T–2)

Brown/
GreenBlueWhite/
GreenWhite

GrayPink

VioletYellowBrownGreen

Only with output cables inside the motor housing
Connections for external temperature sensor; evaluation optimized for KTY 84-130(see Temperature measurement in motors in the Encoders for Servo Drives brochure)

Cable shield connected to housing; UP = Power supply voltage
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!
Output cables with a cable length > 0.5 m require strain relief for the cable.

www.heidenhain.com

ECN 1123/EQN 1335 Product Information    01/2023

Other signals13DR. JOHANNES HEIDENHAIN GmbH
Dr.-Johannes-Heidenhain-Straße 583301 Traunreut, Germany +49 8669 31-0
 +49 8669 32-5061
info@heidenhain.de41)

Serial data transmission

1390850 · 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							1390321-xx