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MiniCODER Basic GEL 2440
General
The measuring system comprises a scanning unit Mini-
CODER basic and a precision target wheelPrecision target wheels for attachment to shafts with a
shaft diameter from 8 mm to 130 mm are to be ordered
separately
Limited selection of target wheel variables available
from stockMagnetoresistive sensors contactlessly scan the target
wheel and acquire the rotational speedOutput signals are two 90º phase offset square-wave
signals, their inverse signals TTL / RS 422 as well as a
reference signalEquipped with integrated interpolation, internal ampli-
fication of the sensor signalsEvaluates the signals from the reference gap and in this
way references the position
Features
Output signal level TTL / RS 422 Frequency range 0 to ≤ 500 kHz Rotational speed measurement range from 0 to over
30,000 min-1Temperature range -20 ºC to +100 ºC Protection class IP 68
Advantages
Maintenance and wear-free due to the magnetic meas-
uring systemSuitable for target wheels with module 0.4 or 0.5 Extremely robust thanks to fully encapsulated electron-
icsFlexible cable laying due to axial cable outlet
Field of application
Position and rotational speed acquisition in machine
tool engineering
Description
Construction and design
The measuring unit comprises a scanning unit and a measuring scale. The system does not need dedicated
bearings for this task, as the measuring scale is mounted directly on the shaft. The market-optimised system operates
contactlessly and is extremely compact.
Sensors, magnet and electronics are manufactured using
the latest micro system technology and are fully encapsulated,as such they are particularly resistant to shocks and
vibration. A further advantage of this system is that it is maintenance and wear-free and therefore reduces operating
costs.
Output signals (signal pattern)
The MiniCODER basic outputs square-wave signals with TTL level. In addition, it evaluates signals from a reference gap (TG).
| Signal pattern | Vs | Vout |
| TG | + 5 V DC ± 5 % | TTL |
Vs Supply voltage
Vout Signal output
Reference marks
The MiniCODER basic can detect reference marks in the form of a gap. This reference pulse detected can be used
for referencing the position.
The selection of the reference mark is defined by the size
and rotational speed of the target wheel used, as both parameters have an effect on the forces acting on the reference
mark.
Reference mark G - gap
On a target wheel a tooth is milled away over half the width of the tooth wheel. In this way there is a gap in the reference track that is detected.
Interpolation factor
The sin/cos signals generated in the encoder are interpolated
and output as square-wave signals. The interpolation
factors 1, 2, 4 and 8 are available. The interpolation is undertaken
directly in the sensor.
On the usage of a target wheel with 250 teeth and the selection
of an interpolation factor of 8, the MiniCODER basic
provides 2000 square-wave signals per turn.
Module
The module describes the relationship between the number of teeth and the outside diameter of a target wheel. Given the same number of teeth the following applies: the smaller the module the smaller outside diameter.
Air gap table
| Type | Module | Air gap d, preset measure |
Distance tolerance |
| 4 | 0.4 | 0.15 mm | ±0.03 mm |
| 5 | 0.5 | 0.15 mm | ±0.03 mm |
The MiniCODER must be ordered to suit the target wheel.
Connection type
The MiniCODER basic are supplied with a flying lead.
Connection type K - flying lead
Cable length
With the connection type K (flying lead) there are 4 cable lengths available: 30, 150, 250, 600 cm.
Technical data
| Electrical data | |
| Supply voltage VS | 5 V DC ± 5 %, reverse polarity protected |
| Current consumption | ≤ 60 mA |
| Output level | TTL / RS422 |
| Output signal | Two square-wave signals offset by 90º and their inverse signals, short-circuit-proof; with reference pulse |
| Output frequency | ≤ 500 kHz |
| Power consumption without load | ≤ 0.3 W |
| Electromagnetic compatibility | EN 61000-6-1 to 4 (1) |
| Dielectric strength | 500 V, in accordance with EN 60439-1 |
| Mechanical data | |
| Permissible air gap | 0.15 mm ± 0.03 mm |
| Width of the target wheel | min. 4.0 mm |
| Target wheel material | Ferromagnetic steel |
| Weight | 30 g |
| Housing material | Die cast zinc |
| Ambient data | |
| Assured operating temperature range | -20 ºC to +100 ºC |
| Operating and storage temperature range | -20 ºC to +100 ºC |
| Protection class | IP 68 |
| Vibration resistance | 100 m/s2, in accordance with DIN EN 60068-2-6 |
| Shock resistance | 1000 m/s2, in accordance with DIN EN 60068-2-27 |
| Electrical connection | |
| Max. permissible cable length | 100 m (Pay attention to voltage drop on the supply cable) |
| Connection | 9-core cable, core cross-section 0.15 mm2, outside diame- ter 5-0.3 mm, min. bending radius 25 mm. |
Dimensional drawing, boring and milling sketch,
installation drawing
Dimensional drawing GEL 2440 - axial cable outlet
Boring and milling sketch
Assembly drawing
Target wheels
For the measurement of rotary movements, MiniCODERs form a unit together with target wheels. The target wheel size and the related diameter depend directly on the module and the number of teeth.
Standard target wheels
Standard target wheels are available on short delivery times from stock. For specifications and designs see "Technical information ZAx / ZFx".
Terminal assignment
Terminal assignment
| Core colour | Signal / function | TG | |
| green | V1+ | Track 1 |  |
| yellow | V1- | /Track 1 |  |
| grey | VN+ | Reference track |  |
| white | 0 V | GND | |
| brown | VS | + 5 V supply voltage | |
| blue | V2+ | Track 2 |  |
| red | V2- | /Track 2 |  |
| pink | VN- | /Reference track |  |