Incremental Rotary Pulse Encoder GEL 2701, 2710, 2711
Incremental Encoder Gel 2710
Incremental Encoder Gel 2711
Incremental Encoder Gel 2701
These incremental rotary pulse encoders have been specially designed for the needs of rail vehicle applications. The multi-channel encoder (pulse generator) has been designed to provide independent output signals for different control electronics such as motor speed control, wheel slide protection, automatic train protection, distance evaluation or to provide redundant signals for safety requirements
- Magnetic measuring principle: robust and durable, resistent to dirt, oil and condensation.
- 1 to 8 channels
- Up to three different pulse numbers from one encoder
- Up to 400 pulses per revolution
- Signal channels can be optionally electrically separated for different control electronics
- Voltage and current signal channels
- Phase separation between channels freely selectable (e.g. 90° for additional direction of rotation evaluation)
- Highly accurate signal duty cycle and phase relationship
- Selection of flanges available
- Version with torque arm for mounting directly on the wheel
- Protection class IP 67
The flexible modular design of the multi-channel encoders make them ideal for not only new project requiring state of the art technology but also for retrofitting existing vehicles.
Functional DescriptionFunctional description
Inside the multi-channel encoder is a metal structure attached to the encoder shaft. The structure is scanned by one or more magnetic sensors. The electronic circuit generates electrical pulses giving output signals in the form of square waves with pre-defined voltage or current level. The output frequency is proportional to the rotational speed of the shaft. The signals are evaluated in the vehicle control electronics.
The use of a magnetic sensor system contributes significantly to the suitability of this encoder for the rigors of rail vehicle applications. The sensors are resistant to adverse conditions such as ingress of dirt, oil or moisture or by condensation due to temperature changes.
The heavy duty design of the encoder includes bearings that have been specially selected to ensure a maintenance free long life in the harshest of environments. The metal structure used are particularly rigid to withstand even extreme shocks and vibrations.
Types of encoder / means of installation
Types GEL 2710, 2711 and 2712 are intended for outside-journal bogies. They are flanged onto the bearing cover of the wheelset and driven (e.g.) by a clutch disc.
The GEL 2701 is suitable for inside-journal bogies. A rotor flange is mounted on the wheelset, enabling the encoder to turn freely. A torque support connected to the bogie frame prevents the encoder from rotating with the wheel.
For all our encoders we offer customer-specific series production with various cables, protective sleeves and plugs.
From one to eight signal channel outputs are available. These can be arranged as single channels or in groups of channels with a fixed phase relationship. A typical arrangement is a group of two sensors 90° electrically separated for additional direction of travel detection. Other phase separations are possible such as three sensors 120° electrically separated. Combinations of groups are possible such as one single channel plus a group of two sensors 90° separated.
The channels can all be on a common supply voltage or, if required the groups of channels can be electrically isolated with different supply voltages between 10 and 30 V DC.
The encoder is designed to provide up to three different pulse numbers. The pulse numbers can be freely assigned to the output channels or channel groups.
An example of a combination of channels and pulse numbers:
Motor speed feedback: 2 channels with 90° (elec.) separation 110 pulses per revolution, 24 V DC supply voltage.
Wheel slide protection: 1 channel, 55 pulses per revolution 15 V DC supply voltage.
Automatic train protection: 1 channel, 200 pulses per revolution 15 V DC supply voltage.
|Number of channels||1 ... 8|
|Phase between 2 or more channels||Standard 90° electrical. Others (e.g. 120°) possible|
|Pulse numbers per revolution||1 ... 400*|
|Duty cycle||50% ± 10 %|
|Output frequency||0 ... 20 kHz|
|Voltage output signals|
|Supply voltage VS||10 ... 30 V DC|
|Current consumption per channel (no load)||IB≤ 30 mA|
Voltage level high
Voltage level low
|square wave, push-pull circuit**
typ. VS -2 V
typ. < 2 V
|Current output signals|
|Supply voltage VS||12 ... 16 V DC|
|Voltage drop per channel||4 V|
Voltage level high
Voltage level low
14 mA (nominal)
7 mA (nominal)
|Connectable load||(VS - 4 V) / 16 mA|
|Max. operating r. p. m.||5000 min -1|
|GEL 2701||1400 g without cable, without drive|
|GEL 2710||2000 g without cable, without drive|
|GEL 2711||2000 g without cable, without drive|
|Cable, connector and protection horse are adapted after type of device, specification on request.|
|Ambient temperature range||-40°C ... +100°C|
|Shock protection||EN 61373 cat.3|
|Vibration protection||EN 61373 cat.3|
|Climatic protection||0 ... 98 % relative humidity, condensing|
|Electromagnetic compatibility (EMC)||rail vehicles: EN 50121-3-2|
|Insulation strength EN 60439-1||1.5 kV, 50 Hz, 1 min.|
|conform or exceeds||EN 50155|
|Protection class||IP 67|
* from 202... 400 impulses per revolution no phase relationship between the channels is possible. 1 ... 200 all impulse numbers possible. From 202 ... 400 all straight impulse numbers possible.
** For further details please refer to operating instructions.
Mounting Examples and Dimension Drawings - Encoder GEL 2710Mounting Example
Dimensional drawing GEL 2710 (with rectangular shaft)
Mounting Examples and Dimension Drawings - Encoder GEL 2711Dimensional drawing GEL 2711
Mounting Examples and Dimension Drawings - Incremental Encoder GEL 2701
The encoder is easily mounted onto a rotor flange which is itself fitted to the wheel centre. The encoder is prevented from rotation with a torque support connected to the vehicle chassis. Rotor flanges can be supplied with different dimensions to suit the application.Mounting Example
Dimensional drawing GEL 2701
Examples for anti-rotation systems
Lenord & Bauer: Rail Speed Sensors & Rotary Pulse Encoder
Other products relating to GEL 27xx are: GEL 207, GEL 208, GEL 209, GEL 219, GEL 260, GEL 293