Артикул: RX8128
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Description of overall system
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Description
- Definition of the accuracies
- Overview interfaces
- Thermal behaviour
Technical data
|
| Ball Rail Systems | Roller Rail Systems | Comment |
| Maximum traversing speed | 5 m/s | 4 m/s | |
| Acceleration amax. | 500 m/s2 | 150 m/s2 | |
| Shock | 500 m/s2 /11 ms | EN 60068-2-27 | |
| Vibration | 100 m/s2 (57Hz - 200Hz) | EN 60068-2-6 | |
| Protection type | IP67 | EN 60529, tested with metalworking fluid Curtis S90 | |
| EMV | EN 61326-1 | CE-marking | |
| RoHS compliant | yes | ||
| UL compliant | yes | ||
Information
The precision of the length measurement
The precision of the length measurement is essentially determined by:
- the pitch of the incremental scale
- the scanning and signal processing in the scanner
Distinction is made between the position deviations over relatively long movement paths, for example, over the entire rail length and the position deviations within a division period.
Position deviations at the same position
The repeatability is the maximum position deviation that can occur when multiple driving
on the same position from both travel directions. At any measuring point, this is less than ± 0.25 µm.
Position deviations within a division period
The position deviations within a division period of the scale (1000 μm) are determined by the signal period of the measuring instrument as well as the quality of the division and its scan.
At any measuring point, they are less than ± 0.75 µm (≙ 0.75‰ of the division period). This is of vital importance to the accuracy of the positioning operation as well as for the speed control during the slow, uniform moves of an axis and thus for surface quality and processing quality.
Position deviation (μm) within a pitch period
| 1) | Position deviation (µm) |
| 2) | Measuring distance (μm) |
Position deviations over the measurement distance
The accuracy of the scale in the guide rail is specified in accuracy classes, which are defined as follows:
The extreme values ± E of the measuring curves for any, max. 1 m length of measured travel are within the maximum deviation ± A (at 20°C). The deviation A is dependent on the length of the guide rail (see Fig.)
The extreme values ± E are determined during the final inspection and disclosed in the measurement report.
The linear lead deviation is documented in the included measurement report of the guide rail.
The lead deviation can be compensated together with the thermal linear expansion (see section "Thermal behavior") in the drive control system.
Accuracy class of the scale
| 1) | Maximal deviation A (± µm/m) |
| 2) | Rail length (mm) |
| 3) | Accuracy class 5 µm |
| 4) | Accuracy class 3 µm |
Example: Measurement curves of an IMS rail
| 1) | Deviation (μm) |
| 2) | Measured travel (mm) |
System accuracy (IMS-I / IMS-A)
| Scale | Scanner | |
|
| Interpolation accuracy (µm) | Repeatability (µm) |
| Accuracy class 3 µm | ± 0,75 | ± 0,25 |
| Accuracy class 5 µm | ± 0,75 | ± 0,25 |
The precise accuracy of the scale is provided in the included measurement report. To determine the accuracy of the system, the accuracy classes of the scale, the interpolation accuracy and repeatability are to be added together.
Overview interfaces
IMS-I
| Interface (signal) | I1 (1VSS) | I2 (TTL 1 μm) | I3 (TTL 5 μm) | I4 (TTL 10 μm) |
| Resolution of the TTL signal (µm) | - | 1 | 5 | 10 |
| Dissolvability of the 1 VSS / 40µm signal (µm) | 0,025 | - | - | - |
IMS-A
| Interface (signal) | HF | DQ | FN | S1 | S2 | S3 | S4 |
| Resolution of the digital interface (µm) | 1,25 | 0,025 | 0,025 | 10 | 1 | 0,25 | 0,125 |
| Dissolvability of the 1 VSS / 40µm signal (µm) | 0,025 | - | - | 0,025 | 0,025 | 0,025 | 0,025 |
Thermal behavior
The thermal behavior of the IMS is essentially determined by two components:
1 IMS guide rail -> profile rail with integrated steel scale.
2 IMS guiding wagon -> guiding wagon with attached scanner and sensors.
3 IMS guide rail (coefficient of linear expansion):
Profile rail: αtherm = 11 x 10-6K-1
Scale: αtherm = 11 x 10-6K-1
Influence of the frame:
Acceptance: Bolting the guide rail to an ideally rigid mounting base.
The mounting base determines the linear expansion of the IMS rail: αtherm = αtherm – mounting base
Downloads
 | Integrated Measuring System IMS for Ball and Roller Rail systems / Instructions for electrical interfaces / only PDF Manual | R320103166_EN | 2017-10-01 | English | PDF | 2.4MB Product Groups: Integrated measuring systems |
| Integrated Measuring System IMS for Ball and Roller Rail Systems Manual | R320103262_EN | 2020-07-01 | English | PDF | 1.8MB Product Groups: Integrated measuring systems |
| Catalog Integrated Measuring System IMS for Ball and Roller Rail Systems Catalog | R999000487 | 2020-06-01 | English | PDF | 2.7MB Product Groups: Ball Rail Systems, Roller Rail Systems, Integrated measuring systems Catalog Integrated Measuring System IMS for Ball and Roller Rail Systems |
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