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Safety function
The RESOLUTE Functional Safety Siemens DRIVE-CLiQ encoder system shall provide a safe
position when requested by the controller.
The following restrictions apply to this claim:
•
The maximum request rate supported is 16 kHz.
•
The RESOLUTE Functional Safety Siemens DRIVE-CLiQ encoder system can support:
Resolution
Maximum scale length (L) with 34 bit position word
Maximum scale length (L) with 28 bit position word
•
The RESOLUTE Functional Safety Siemens DRIVE-CLiQ encoder system shall allow
electrical errors to be detected by the controller at least for:
Linear systems: electrical error exceeding 600 μm
Rotary systems: electrical error exceeding 1.5°
•
Provided it is installed correctly, the RESOLUTE Functional Safety Siemens DRIVE-CLiQ
encoder system shall have:
Linear systems: mechanical error not exceeding ±1 mm
Rotary systems: mechanical error not exceeding ±2.5°, refer to page
and page 25
(RESA) or page
38
•
Any thermal expansion effects of the scale are excluded from the accuracy of the safe position.
•
The controller checks whether the obtained position data lie in the position window
expected by the controller. Unexpected position data include position jumps and incorrect
direction of travel.
•
When errors are detected by the controller it is the responsibility of the system manufacturer
to introduce appropriate safety measures e.g. safe stop etc.
•
The machine controller that interfaces to the RESOLUTE Functional Safety encoder must
have its Functional Safety functions enabled (as often it is a configuration parameter to turn
on Functional Safety functionality), as this is necessary for the RESOLUTE Functional Safety
to be valid.
12
RESOLUTE™ Functional Safety Installation guide and safety manual Siemens DRIVE-CLiQ encoder system
1 nm
17.18 m
N/A
24
(REXA)
•
The system manufacturer must ensure that the scale and the readhead are mounted securely
and cannot become detached from their mounting points e.g. a bracket fails.
•
It is the responsibility of the machine builder to validate the safety functions of
the RESOLUTE Functional Safety Siemens DRIVE-CLiQ encoder system in the
specific application.
•
The system manufacturer must perform a verified commissioning test during installation.
•
The system repairer must perform a verified commissioning test following replacement of a
50 nm
system part.
N/A
13.42 m
Fault exclusions
The following actions will invalidate the Functional Safety certification of the RESOLUTE
Functional Safety system:
•
Faults caused by cutting and reconnecting the readhead cable or extending the
readhead cable.
•
Incorrect installation of the readhead.
•
Incorrect installation of the rotary or linear scale.
•
Failure to follow the instructions contained within this installation manual.
•
Dismantling of the RESOLUTE readhead or the Siemens DRIVE-CLiQ interface.
•
Operating the system outside of the limits specified within this installation manual.
Original instructions
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