Product Information

EQN 400
ERN 400
ERN 401
Rotary Encoders as
Replacements forSiemens 1XP8000 andSiemens 1XP8001

11/2021

EQN/ERN 400 series
Absolute and incremental rotary encoders• Torque support• Blind hollow shaft• Replacement for Siemens 1XP8000



Siemens model Replacement model
1XP8012-10

ERN 430

1)HTL

1XP8032-10

ERN 430

HTL

1XP8012-20

ERN 420

1)TTL

1XP8032-20

ERN 420

TTL

1XP8014-10

EQN 425

EnDat

1XP8024-10

EQN 425

EnDat

1XP8014-20

EQN 425

SSI

1XP8024-20

EQN 425

SSI1)

1)

1)

ID

Design597331-76Cable (0.8 m) with 12-pin M23 mounted
coupling with central fastening

597330-74
1109258-74

Cable (1 m) with 17-pin M23 coupling

1132407-73

Original Siemens encoder has a 17-pin M23 flange socket

A = Bearing of mating shaft
k = Required mating dimensions
M = Measuring point for operating temperature
1 = Distance from clamping ring to coupling
2 = Clamping screw with X8 hexalobular socket: tightening torque: 1.1 Nm ±0.1 Nm
3 = Direction of shaft rotation for ascending position values

2

Product Information EQN 400, ERN 400, ERN 401    11/2021Absolute

Incremental

EQN 425

ERN 420

ERN 430« HTL

Interface*

EnDat 2.2

SSI

« TTL

Ordering designation

EnDat01

SSI41r1–

Position values per rev.

8192 (13 bits)–Revolutions

4096–CodePure binary

Gray

–

Elec. permiss. shaft speed
Deviations1)

 1500/10 000 rpm±1 LSB/±50 LSB

 12 000 rpm±12 LSB–

Calculation time tcal
Clock frequency

 9 µs
 2 MHz 5 µs––Incremental signals» 1 VPP2)Line count

2048

512

1024

Cutoff frequency –3 dB
Output frequency
Edge separation a

 400 kHz–– 130 kHz––– 300 kHz 0.39 µs

System accuracy±20“±60“

1/20 of grating period

Electrical connection

Cable (1 m) with M23 coupling

Cable (0.8 m) with mounted coupling and central
fastening

Supply voltage

DC 3.6 V to 14 V

DC 4.75 V to 30 V

DC 5 V ±0.5 V

Power consumption (max.)

3.6 V:  0.7 W
14 V:  0.8 W

4.75 V:  0.675 W
30 V:  0.875 W–Current consumption(typical, without load)

5 V: 105 mA

5 V: 85 mA
24 V: 20 mA

 120 mA

 150 mAShaft

Blind hollow shaft ¬ 12 mm

597330-74

597331-76

 TTL

 HTL

DC 10 V to 30 V

Mech. permiss. shaft speed n  6000 rpm
Starting torque (typical)

0.05 Nm at 20 °C

Moment of inertia of rotor

 4.6 · 10–6 kgm2Permiss. axial motion of
measured shaft±0.5 mm

Vibration 55 Hz to 2000 Hz
Shock 6 ms

 300 m/s2 (EN 60068-2-6)
 1000 m/s2 (EN 60068-2-27)

Max. operating temperature 100 °C
Min. operating temperature

Fixed cable: –40 °C
Moving cable: –10 °C

Protection EN 60529

IP66Mass 0.3 kg

ID number1109258-74

1132407-73* Please select when ordering
Speed-dependent deviations between absolute value and incremental signal2)
Deviating tolerances: signal amplitudes: 0.8 VPP to 1.2 VPP1)

Product Information EQN 400, ERN 400, ERN 401    11/2021

3

ERN 401 series
Incremental rotary encoders• Stator coupling via fastening clips• Solid shaft with 60° centering taper• Replacement for Siemens 1XP8001• Includes installation kit with housing

Siemensmodel

Replacement ID
model

1XP8001-2

ERN 421538724-71

1XP8001-1

ERN 431538725-02

A = Encoder bearing
B = Bearing of mating shaft
k = Required mating dimensions
M = Measuring point for operating temperature
1 = Direction of shaft rotation for ascending position values

4

Product Information EQN 400, ERN 400, ERN 401    11/2021

Incremental
ERN 421

ERN 431

Interface

« TTL

« HTL

Line count1024

Reference markOne

Output frequency
Edge separation a 300 kHz
 0.39 µs

System accuracy

1/20 of grating period

Electrical connection

12-pin flange socket (male)

Supply voltage

DC 5 V ±0.5 V

DC 10 V to 30 V (with reverse-polarity protection)

Current consumption
without load 120 mA

 150 mA

Shaft

Solid shaft with M8 external thread, 60° centering taper1)

Mech. permiss. shaft speed n

 6000 rpm

Starting torque (typical)

0.025 Nm (at 20 °C)

Moment of inertia of rotor

 2.7 · 10–6 kgm2

Permiss. axial motionof measured shaft±1 mm

Vibration 55 Hz to 2000 Hz
Shock 6 ms

 100 m/s2 (EN 60068-2-6); higher values upon request
 1000 m/s2 (EN 60068-2-27)

Operating temperature–40 °C to 100 °C

Protection EN 60529

IP66Mass

 0.3 kg

ID number538724-71

538725-021)	For the relationship of operating temperature to shaft speed and supply voltage, see General mechanical informationin the Encoders for Servo Drives brochure

Product Information EQN 400, ERN 400, ERN 401    11/2021

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1366430 · 00 · A · 02 · 11/2021 · 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.

Further information:
Comply with the requirements described in the following documents to ensure correctand intended operation:• Brochure: Rotary Encoders							 349529-xx• Brochure: Encoders for Servo Drives		
208922-xx• Brochure: Interfaces of HEIDENHAIN Encoders
1078628-xx• Brochure: Cables and Connectors			
1206103-xx