06/2020
Product Overview
Rotary Encoders for the Elevator Industry
Rotary encoders for the elevator industry
The demands on elevator technology have been growing steadily in recent years, calling for higher speeds, higher shafts, smaller footprints, and lower operating costs. Also crucial is optimal passenger comfort, requiring smooth starts, constant accelerations, gentle braking, and precise arrival for a pleasant and comfortable ride.
A key role in meeting these requirements is played by the drive system, with an unbroken trend towards gearless motor systems. These systems offer a number of economic and environmental benefits: • Elevator systems featuring low vibration and noise• Reduced space requirements thanks to machine-room-less elevators (MRL)• Comfortable ride characteristics• Low energy consumption• Low maintenance and oil-free
Permanent-magnet synchronous motors are often used due to their higher power density. Depending on the control strategy, these motors may require absolute position feedback for proper rotor position control. This feedback can be provided by an absolute rotary encoder or an incremental rotary encoder with commutation signals.
Most of these demanding drive systems also require high-resolution rotary encoders integrated into the control loop as position encoders for measurement of the actual speed. Absolute rotary encoders with the purely serial EnDat 2.2 interface, as well as incremental rotary encoders, are ideally suited for this purpose. Rotary encoders from HEIDENHAIN utilize optical or inductive scanning principles. Radial or axial scanning is possible along the entire circumference or over a limited segment. Through mechanical adaptation, rotary encoders from HEIDENHAIN can be used for the feedback control of various motor designs in the elevator industry, such as internal, external, or disc motors.
To meet the high functionality and reliability requirements, and to enable intelligent system integration, rotary encoders for elevator drive systems must possess highly specialized characteristics. This is also true of rotary encoders for other elevator technology applications, such as digital shaft copying systems and door motor control.
Overview Rotary encoders for elevator motor control
The HEIDENHAIN product portfolio offers solutions specifically designed for elevator technology. The excellent signal quality and high accuracy of HEIDENHAIN rotary encoders ensure high-quality speed control and exact positioning. Technical details such as rigid shaft connections, high mechanical natural frequencies for rotary encoder couplings, wider run-out tolerances, easy mounting, and, for absolute rotary encoders, high-performance bidirectional interfaces (EnDat), are just a few examples of HEIDENHAIN quality.
Encoders with an EnDat interface (purely digital or analog signals) permit the retrieval of encoder parameters and predefined motor and brake parameters from an internal EEPROM. This can shorten setup times and prevent input errors during the configuration of drive system parameters. EnDat encoders also permit electronic position adjustment (zeroing), allowing the encoder’s absolute position value to be aligned with the orientation of the motor’s rotating field and eliminating the need for complicated mechanical alignment. Depending on the encoder, diagnostic functionality such as temperature evaluation and valuation numbers are available for assessing the encoder’s functional reserves. Upon a change in critical values, preventive measures can be taken to avoid an unscheduled maintenance interruption of the elevator.
The flawless operation of brakes is a key safety characteristic of elevators. Brake monitoring is usually performed by separate microswitches. These microswitches are installed specifically for brake release monitoring and incur considerable cost and effort both before and during operation. The KCI 419 Dplus rotary encoder lets you dramatically reduce these costs and increase operational safety at the same time. Along with rotational position feedback, the KCI 419 Dplus inductive rotary encoder delivers axial motion feedback for direct measurement of the brake stroke. Based on this feedback, the current brake status (released, applied, or malfunction) and the level of brake wear can be derived by the subsequent electronics.
AEF/ECN/ERN 1300 series (PCB connector) and ECN/ERN 400 (cable connection)  With expanding ring coupling (with a high natural frequency of the stator coupling)
AEF/ECN/ERN 1300 series (PCB connector) and ECN/ERN 400 (cable connection)  With plane-surface coupling (wider run-out and mounting tolerances)
ECN/ERN 100 seriesHollow shafts with inside diameters  of up to 50 mm
KCI 419 Dplus inductive rotary encoderProvides additional feedback for axial motion, as well as data for temperature monitoring
ECI 4000 seriesFeaturing a hollow shaft with an inside diameter of up to 180 mm and wide mounting tolerances
ERN incremental rotary encoders / AEF, ECN, ECI, and KCI absolute singleturn rotary encoders
ModelOutside dia.1)Shaft versionProtection ratingIncremental signalsSignal periods per revolution Absolute position values
Position values per rev.Commutation
Brake stroke monitoring
ERN 120ERN 130ERN 180
87 mmHollow through shaft, ¬ 20 mm, 25 mm, 30 mm, 38 mm, or 50 mm
IP64« TTL« HTL» 1 VPP
1000 to 5000–––
ECN 113» 1 VPP2048EnDat018192 (13 bits)–
ECN 125––EnDat2233 554 435 (25 bits)–
ERN 13212) 58 mmTaper shaft, ¬ 9.25 mm, 1:10 taper
ECN/ERN 400:  IP64AEF/ECN/ERN 1300:  IP40
« TTL1024 to 10000–––
ERN 13262)« TTL1024, 2048,  4096, or 8192  UVWThree signals for block commutation
ERN 13812)» 1 VPP512, 1024, 2048, 4096––
ERN 1387ERN 487» 1 VPP2048» 1 VPPZ1 track for sine commutation–
ECN 13133)
ECN 4132048EnDat018192 (13 bits)–
ECN 13253)
ECN 425––EnDat2233 554 435 (25 bits)–
AEF 13233)8 388 608 (23 bits)–
KCI 4194)65 mm12 mmIP37––EnDat22524 288 (19 bits)0.5 mm to 1.6 mm
ECI 11987 mm30 mm, 38 mm, 50 mmIP20––EnDat22524 288 (19 bits)–
ECI 40103)174 mm, 262 mmHollow through shaft, ¬ 90 mm, 180 mm
IP20––EnDat221 048 576 (20 bits)–
1) Rotary encoder housing2) Only in version with expanding ring coupling3) Connection of an external temperature sensor in the motor is possible4) Output of additional temperature values (armature plate of the brake)
Rotary encoders for digital shaft copying systems
Shaft copying is used to ensure jerk-free braking and precise positioning of the elevator car. These systems measure the car’s position and forward it to the control. Incremental rotary encoders and especially absolute rotary encoders from HEIDENHAIN are ideal for this application. These encoders enable digital shaft copying with clear benefits for control technology and installation.
The key advantage of using absolute multiturn rotary encoders for position detection is the continuous availability of the car’s absolute position (even after a power failure). Since actual position values are available at all times, the car can approach its destination rapidly.
EQN 400 seriesBearing assembly with the EQN 400Shaft load up to:Axial 150 NRadial 350 N
EQN absolute multiturn rotary encoders with a mounted stator coupling
ModelOutside dia.1)Shaft versionProtection ratingIncremental signalsSignal periods per revolution Absolute position values 
Position values per revolution
Revolutions
EQN 42558 mmBlind hollow shaft or hollow through shaft, ¬ 12 mm
IP64» 1 VPP512 or 2048EnDat018192 (13 bits) 4096
512SSI
IP66512 or 2048EnDat01
512SSI
EQN 43758 mmBlind hollow shaft or hollow through shaft, ¬ 12 mm
IP64–2048EnDat2233 554 432 (25 bits)4096
1) Rotary encoder housing
A bearing assembly with an EQN 400 is offered specifically for shaft copying. Elevator car position is often measured by means of toothed belts and deflection pulleys. Thanks to the bearing assembly, the high resulting forces are decoupled from the precision bearing of the rotary encoder, thereby preventing encoder overload. 
ERN 1023ERN 1123
ERN incremental rotary encoders / ECI absolute singleturn rotary encoders / EBI absolute multiturn rotary encoders
ModelOutside dia.1)Shaft versionProtection ratingIncremental signalsSignal periods per revolution Absolute position values 
Position values per revolutionRevolu-tions2)
ERN 1020ERN 1030ERN 1080
36.5 mmBlind hollow shaft, ¬ 6 mmIP64« TTL« HTL» 1 VPP
100 to 3600 –––
ERN 102335 mmIP64« TTL500 to 2048UVWThree signals for block commutation
ERN 1123IP00
ECI 111837 mmIP00––EnDat22262 144 (18 bits)–
EBI 113565 536
1) Rotary encoder housing2) By means of battery-buffered revolution counter
OverviewRotary encoders for door motors
In high-rise buildings with large elevator capacities and high passenger traffic, shorter stopping times are an important goal, allowing more passengers to be transported. A critical factor in handling a building’s passenger traffic is proper elevator door operation.
Fast and precise opening and closing with minimal noise requires servo-controlled door motors. Compact rotary encoders from HEIDENHAIN are particularly well suited for speed and position feedback. Thanks to a mounting diameter of less than 40 mm, they are also ideal for limited space requirements.
ECI/EBI 1100 series
HEIDENHAIN measuring equipment
PWM 21The PWM 21 phase angle measuring unit, in conjunction with the included ATS adjustment and testing software, provides an adjustment and testing package for the diagnosis and adjustment of HEIDENHAIN encoders.
PWM 21
Encoder input• EnDat 2.1 or EnDat 2.2 (absolute value with or without incremental signals)• DRIVE-CLiQ• Fanuc Serial Interface• Mitsubishi high speed interface• Yaskawa Serial Interface• SSI• 1 VPP/TTL/11 µAPP
InterfaceUSB 2.0
Supply voltageAC 100 V to 240 V or DC 24 V
Dimensions258 mm x 154 mm x 55 mm
LanguagesGerman or English (selectable)
Functions• Position display• Connection dialog• Diagnostics• Mounting wizard for the EBI/ECI/EQI, LIP 200, LIC 4100, and others• Additional functions (if supported by the encoder)• Memory contents
System requirements and recommendationsPC (dual-core processor > 2 GHz)RAM > 2 GBOperating system: Windows XP, Vista, 7 (32-bit/64-bit), 8, 10200 MB of available hard-disk space
DRIVE-CLiQ is a registered trademark of Siemens AG
For more information, see the PWM 21, ATS Software Product Information document.
PWT 101The PWT 101 is a testing device for the functional testing and adjustment of incremental and absolute HEIDENHAIN encoders. Thanks to its compact and rugged design, the PWT 101 is ideal for portable use.
PWT 101
Encoder inputonly for HEIDENHAIN encoders
• EnDat• Fanuc Serial Interface• Mitsubishi high speed interface• Panasonic Serial Interface• Yaskawa Serial Interface• 1 VPP with Z1 track• 1 VPP• 11 µAPP• TTL
Display4.3-inch touchscreen
Supply voltageDC 24 VPower consumption: max. 15 W
Operating temperature0 °C to 40 °C
Protection EN 60529IP20
DimensionsApprox. 145 mm x 85 mm x 35 mm
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587718 · 09 · A · 02 · 06/2020 · PDF
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Further information
For detailed information, including general technical descriptions, mounting information, specifications, and exact dimensions, please refer to the brochures and  Product Information documents, or visit www.heidenhain.de.
For detailed descriptions of all available interfaces and cables, as well as general electrical information, please refer to the brochures.
Product InformationECN 1313ECN 1325ERN 1387
Contents: Rotary encoders for elevator motor control
BrochureRotary Encoders
Contents: ERN, RODincremental rotary encodersECN, EQN, ROC, ROQabsolute rotary encoders
BrochureInterfaces of HEIDENHAIN Encoders
Product InformationKCI 419 Dplus
Contents: Rotary encoder with axial distance measurement
BrochureEncoders for Servo Drives
Contents: Rotary encodersAngle encodersLinear encoders
Product InformationECN 413ECN 425ERN 487
Contents: Rotary encoders for elevator motor control (IP64 degree of protection)
Product InformationAEF 1323
Contents: Absolute rotary encoder for integration in elevator servo drives
BrochureCables and Connectors