Innovative rotary speed sensors for rail vehicles
Metro Magazine
Absolute Rotary Pulse Encoder GEL 15x
Absolute Encoder GEL 15x
General Absolute Encoder Information
In contrast to incremental rotary pulse encoder, absolute encoders supply unambiguous code information in each angle position. The advantage of this method is that even after a power failure, the actual position is sent to the evaluation electronics. Measurement errors caused by missing pulses and cumulative errors are also eliminated.
- Single-turn: 4096 measurement increments per 360 °
(optional: 8192) - Multi-turn: 4096 measurement increments per 360 °
(optional: 8192) with max. 4096 revolutions - Permissible shaft load 250 N (axial and radial)
Rotary Pulse Encoder Design
The flange and housing consist of anodised aluminium. A 12 mm ball bearing with a sealing ring is used for the shaft bearing. Three different flange versions are available with GEL 153/157/159 (singleturn) and GEL 152/154/158 (multiturn).
Measurement Principle
The absolute encoder works on the optical measuring principle. The code disk is scanned via GaAlAs diodes. By using a special opt-array with a reference transistor (this keeps the load of the LED controllable) and ASICs developed by the company it has been possible to further improve long-term reliability.
Code Types
The absolute encoders supply their information in the Gray code.
Technical Data
| Electrical Data | |
| Sensor system | GaAIAs diode photo-array, photo-transistor array |
| Measurement increment deviation | ≤ + 2' 38" |
| Parallel outputs | ground-switching, positive-switching |
| Serial outputs (SSI) | RS 422 / 485 |
| Output frequency | max. 10 kHz |
| Output code | Gray |
| Operating voltage range | + 11 V ... + 30 V DC |
| Operating current | single-turn: 50 mA, typical, max. 70 mA multi-turn: 60 mA, typical, max. 80 mA |
| EMC, electromagnetic compatibility | EN 61000-6-2, EN 61000-6-4 |
| Mechanical Data | |
| Operating speed | 3000 rpm max. (continuous) 4000 rpm max. (short term) at max. shaft load and -20°C ... +60°C operating temperature, higher values are possible at low load. |
| Angle acceleration | 105 rad/s2 max. |
| Operating torque | ≤ 5 Ncm at a speed of 1000 rpm 8 Ncm at a speed of 1000 rpm (GEL 154/157) |
| Starting torque | ≤ 1 Ncm, 4 Ncm (GEL154/157) |
| Permissible shaft load | 250 N axial and radial |
| Bearing life | 109 revolutions |
| Weight | approx. 0.5 kg (GEL 153 /157 /159) approx. 0.7 kg (GEL 152 /154 /158) |
| Ambient data | |
| Operating temperature | -20°C ... +60°C (optionally -40°C ... +85°C) |
| Storage temperature range | -25°C ... +70°C |
| Permissible relative humidity | 85 % without condensation |
| Shock resistance | 200 m/s2 ; 11 ms (DIN IEC 68) |
| Vibration resistance | 5 Hz ... 1000 Hz; 100 m/s2 (DIN IEC 68) |
| Protection type (DIN 40050) GEL 152/153/158/159 GEL 154/157 |
IP 65 (Nilos ring) IP 66 (sealing ring) |
Dimension Drawings
Three different flange versions are available with GEL 153/157/159 (singleturn) and GEL 152/154/158 (multiturn).
Available versions - Input and output circuits
Available versions - Single-turn encoders| Type | Output Circuit | Scope of delivery contains |
| GEL 153 G 4096 A 05 | 0 (ground- switching) | 37-pole D-sub-miniature mating connector |
| GEL 157 G 4096 A 05 | 0 (ground- switching) | 37-pole D-sub-miniature mating connector |
| GEL 159 G 4096 A 05 | 0 (ground-switching) | 37-pole D-sub-miniature mating connector |
| GEL 153 G 4096 A 25 | 2 (positive-switching) | 37-pole D-sub-miniature mating connector |
| GEL 157 G 4096 A 25 | 2 (positive-switching) | 37-pole D-sub-miniature mating connector |
| GEL 159 G 4096 A 25 | 2 (positive-switching) | 37-pole D-sub-miniature mating connector |
| Type | Output Circuit | Scope of delivery contains |
| GEL 152 G 4096 N 05 | 0 (ground- switching) | 25-pole D-sub-miniature mating connector |
| GEL 154 G 4096 N 05 | 0 (ground- switching) | 25-pole D-sub-miniature mating connector |
| GEL 158 G 4096 N 05 | 0 (ground-switching) | 25-pole D-sub-miniature mating connector |
| GEL 152 G 4096 N 25 | 2 (positive-switching) | 25-pole D-sub-miniature mating connector |
| GEL 154 G 4096 N 25 | 2 (positive-switching) | 25-pole D-sub-miniature mating connector |
| GEL 158 G 4096 N 25 | 2 (positive-switching) | 25-pole D-sub-miniature mating connector |
Input and Output Circuits
Single and Multi-turn Encoders
