Magnetic Absolute Rotary Pulse Encoder GEL 2035
General Absolute Encoder InformationThe multiturn absolute encoder series GEL 2035 returns a unique positional value for every angular position via an SSI interface with up to 24 bit resolution, the singleturn and multiturn stages each operating with 12 bit resolution. The multiturn stage is based on an electronic gear that registers revolutions without any mechanical components. A battery buffer maintains operation of the rotary pulse encoder in the event of a power outage: even if the encoder shaft rotates while the power is off the absolute position will be correctly returned as soon as power is switched on. The combination with a resolver produces a highly compact redundant system. Complete DC-isolation of the resolver and the magnetic absolute encoder is realized.
ConstructionThe absolute encoder GEL 2035 is based on a magnetic multiturn absolute encoder with electronic gear and returns a resolution of up to 24 bits. The absolute position is given via an SSI interface. If you wish to construct a completely redundant measuring system there is also the option of combining the magnetic multiturn with a resolver. In this combination you have an inductive resolver as singleturn absolute encoder with an analog output signal coupled with a magnetic multiturn absolute encoder with digital output. The encoder housing is of anodized aluminum with a standard flange of 58 mm. The SMD electronic components are implemented using the very latest technology. The absolute encoder GEL 2035 is suitable both for standard applications and for heavy-duty work, withstands aggressive media and has an impressively long maintenance-free life.
Measuring PrincipleThe absolute encoder operates on the basis of contact-free magnetic sampling of a diametral magnet that is embedded in the encoder shaft. Magneto-resistive (MR) sensors register the orientation of the magnetic field directly as an absolute position within a single rotation and register the number of rotations independently of the power supply. Even without power (outages, maintenance) a battery buffer enables the GEL 2035 to detect and register changes of positions. This magnetic sampling technology is not subject to aging and is not affected by temperature fluctuations, dirt or condensation.
Type of code/InterfaceThe magnetic absolute encoder returns the positional values in Gray code via an SSI interface. The redundant resolver signals are provided in the form of analog voltages.
The maximum transfer rate depends on the cable length. We recommend shielded twisted-pair cable.
- Up to 24 bit resolution
- Resolver with Sin/Cos output signal returns redundant positional signal within one revolution
- Special battery-protection mode activated for storage by pressing the preset button when VS = 0 V. Switches automatically to normal mode after starting up.
- Lithium ion battery with a lifetime of up to ten years
- Changes of positions are registered even without power supply (system runs down during a power outage, shaft movement during maintenance).
- Battery buffer serves for emergency operation during power outages and maintenance work. Without power supply the maximum operating speed of 6000 min-1 is allowed shortly.
- Resolution: up to 24 Bit
- Precision: 0.8°
- Signal pattern: SSI and SSI with Resolver
- Singleturn (ST): Sampling using magneto-resistive (MR) sensor elements
- Multiturn (MT): Electronic gear with no additional mechanical components (contact-free, no mechanical gear, battery buffered)
Options for additional DC-isolated signal patterns
- Redundant resolver signal
|Accuracy (DIN 32876)||0.8° (> 9 Bit)|
|Operating voltage||10 to 30 V DC with reverse battery protection|
|Power consumption||< 0.3 W, load-free output (SSI base encoder)|
|Resolution Singleturn (ST)||12 bit (4096 measuring interval in 360°)|
|Resolution Multiturn (MT)||12 bit (4096 revolution, electronic gear with battery buffer)|
|Transmission frequency (SSI)||40 kHz to 500 kHz|
|Transmission||max. 1200 m depending on the transfer rate|
|The immunity of interference||highly immune to interference due to symmetrical data transfer|
|Initialization (application VS)||1 s (switchover time from sleep mode with battery-protection to operating mode)|
|Position evaluation||45 µs|
|Output time||20 µs|
|Housing diameter||58 mm|
|Shaft dimensions (D x length) [mm ]||10 x 20|
|Housing length||53 mm (SSI), 63 mm (SSI with resolver)|
|Weight||300 g (SSI), 450 g (SSI with resolver)|
|Operating speed (limit)||6,000 min-1|
|Shaft loading (axial / radial)||Distance contact point: 5 mm, at 1,000 min-1 = 160 N / 80 N, at 6,000 min-1 = 100 N / 80 N|
|Bearing life||> 109 at 1,000 min-1|
|Operating torque||< 3 Ncm|
|Protection class||IP 67|
|Shock protection (IEC 68, 2-27)||2,000 m/s2, 11 ms|
|Vibration resistance (IEC 68, 2-6)||200 m/s2, 10 to 2,000 Hz|
|Working temperature range||-40 °C to 85 °C|
|Operating temperature range||-40 °C to 85 °C|
|Storage temperature range||-40 °C to 85 °C|
|Relative humidity max||100 %|
|EMC||EN 61000-6-1 to 4|
|Insulation strength||Ri > 1 MΩ at 500 V AC|
Dimension Drawing Gel 2035 (SSI)
Dimensioned drawing GEL 2035 (SSI with resolver)
Technical Data Resolver
|Input voltage||7 V rms|
|Primary||ER1–R2 = Esin ωt|
|Secondary||ES1–S3 = KER1–R2 Cos Θ, K = conversion ratio
ES2–S4 = KER1–R2 Sin Θ
|Input frequency||10 kHz (max. permissible deviation ± 5 %)|
|Conversion ratio||0.5 ± 5 %|
|Precision (measurement errors)||± 10'|
|Zero potential||max. 20 mV rms|
|Phase separation||Nominally 0°|
|Speed ripple||max. 1.5 % at 1,500 min-1|
|Insulation resistance||100 M Ω at 500 V DC|
|Input current||max. 80 mA|
Available VariantsPRESET-Function at SSI
At any given rotary position the output signals can be set to preset values. As default the singleturn is to set 2n-1 and the multiturn is set to half of its maximum value. The preset can be set electrically by applying Vs to the Preset line for t > 100 ms (do not apply permanently). Alternatively, a preset pushbutton is optionally available, recessed in the encoder base (IP 67). This is to be pushed with a blunt pin for t > 100 ms. After enabling the PRESET function the value is directly available, but it will first be transmitted via SSI after 3 s.
|Type Code||Flange||Absolute encoder variants|
|GEL2035SDG1212BES40||clamping flange||GEL 2035 (24 Bit SSI)|
|GEL2035SRG1212BES40||clamping flange||GEL 2035 (24 Bit SSI with resolver)|
Customer-specific modifications to mechanical and electrical properties are fundamentally possible.
For further information about the accessories, please refer to out technical information encoder accessories.