Installation Manual for SMX Modules - OEM Automatic AB
Installation Manual for SMX Modules - OEM Automatic AB
Installation Manual for SMX Modules - OEM Automatic AB
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
<strong>Installation</strong> <strong>Manual</strong><br />
6.6 Combination of different encoder types<br />
For applications with encoder systems please note that, due to the implemented monitoring<br />
features, the <strong>SMX</strong>-range does not place any particular requirements on the internal structure<br />
of the encoder electronics, i.e. standard encoders are normally do suffice. The following<br />
limitations do exist:<br />
• SIN/COS encoder: The internal structure of the sensor system must be designed in<br />
such a way, that output signals <strong>for</strong> both tracks can be generated independently from<br />
each other and Common-Cause faults can be ruled out. Evidence of the mechanical<br />
design, e.g. fastening of the code disc on the shaft, must also be provided. Encoders<br />
with corresponding certificates and test reports are available in the market.<br />
• Compact encoder with 2 x SSI or SSI + incremental: Also in this case evidence <strong>for</strong> the<br />
absence of interaction between both internal encoder units as well as the internal<br />
mechanical design must be provided.<br />
• If only one encoder (e.g. compact encoder) is used, the fault exclusion "shaft<br />
breakage / fault in the mechanical encoder connection" is required. This requires<br />
positive connection of the encoder, e.g. by means of keyway and key or locking pin.<br />
The <strong>SMX</strong> module detects the following faults in the external encoder system:<br />
• Short-circuits between safety relevant signal lines<br />
• Interruptions in safety relevant signal lines<br />
• Stuck at 0 or 1 on one or all safety relevant signal lines<br />
Note: See encoder types in appendix.<br />
7 Configuration of measuring distances<br />
7.1 General description of encoder configuration<br />
The most important input variables <strong>for</strong> the monitoring functions of the module are safe<br />
position, speed and acceleration. These are obtained by dual-channel generation from the<br />
connected sensor system. A category 4 compliant architecture, i.e. continuous dual-channel<br />
recording with high degree of diagnostic coverage, is required <strong>for</strong> Pl e acc. to EN 13849-1.<br />
For possible single-channel components (e.g. mechanical connection of the<br />
sensors/encoders with only one shaft/fastening) fault exclusions acc. to EN ISO 13849-2<br />
may be used, if this should be necessary. For Pl d acc. to EN 13849-1 one may work with a<br />
reduced degree or diagnostic coverage. Simple design sensor systems (speed monitoring<br />
only) may under certain circumstances be sufficient under due consideration of the<br />
permissible fault exclusions acc. to EN ISO 13849-2.<br />
See also APPENDIX 1<br />
Further configuration is described in the programming manual:<br />
37350-820-01-xxF-<strong>SMX</strong> Programierhandbuch.pdf<br />
HB-37350-810-01-10E-EN <strong>SMX</strong> installation manual.doc Page 32 of 32