Siemens Sinumerik 840D sl Function Manual page 50
Sinumerik safety integrated
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- Function manual (2184 pages) ,
- Programming manual (1334 pages) ,
- Commissioning manual (1102 pages)
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System Features
3.5 Safety information & instructions and residual risks
Warning
!
S If, for a 1--encoder system,
a) A single electrical fault in the encoder
b) a break of the encoder shaft (or loose encoder shaft coupling), or a loose
encoder housing will cause a static state of the encoder signals (that is, they no
longer follow a movement while still returning a correct level), and prevent fault
detection while the axis is in a stop state (e.g. in SBH). Generally, the axis is
held by the active closed--loop control. Especially for vertical (suspended) axes,
from a closed--loop control--related perspective, it is conceivable that such an
axis could move downwards without this being detected. The risk of an
electrical fault in the encoder as described under a) is only present for few
encoder types employing a specific principal of operation (for example,
encoders with microprocessor--controlled signal generation such as the
Heidenhain EC/EQI series, Hübner HEAG 159/160, AMO measuring systems
with sin/cos output).
All of the faults described above must be included in the risk analysis of the
machine manufacturer. This analysis will indicate that for hanging/vertical axes
or loads that drive the motor, additional protective measures are required, e.g.
to exclude the fault under a):
S Use of an encoder with analog signal generation
S Use a 2--encoder system
and to exclude the fault under b):
S Carry out an FMEA regarding encoder shaft breakage (or the encoder shaft
coupling slips) or if the encoder housing becomes loose and apply a fault
exclusion process according to e.g. EN 61800--5--2 or
S Use a 2--encoder system (in this case it is not permissible that the encoders
are mounted on same shaft).
A list of the Siemens encoders and motors permissible for Safety
Integrated functions can be obtained from your local SIEMENS contact
partner.
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
© Siemens AG 2015 All Rights Reserved
10/15
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