Fagor QC-PDS, Hardware Manual

Page: 316 / 420

  
Functional safety
9.
FUN
C
TI
ON
AL SAFET
Y
C
abli
ng and
Groun
din
g
· 316 ·
320
Ref.2003
QC-PDS
HARDWARE
9.9 Cabling and Grounding
Safety functions
The following recommendations must be taken into account when
designing the safety functions:
 Instal a - F de 20 mA quick-acting fuse to limit the current at the inputs
of the safety functions. See - F fuse in figures
F. H9/2
,
F. H9/3
and
F.
H9/4
.
 Try keeping power cables and signal cables apart from each other.
Detection of wiring dangerous malfunctions
All dangerous faults to be considered in the wiring of both channels of the
safety function are detected.
Exclusion of wiring dangerous malfunctions
Bear in mind
DETECTION OF WIRING DANGEROUS MALFUNCTIONS
, the safety
function does not require any fault exclusion.
If the user implements the SBC safety function, could use the table D.4
of EN ISO 13849-2 that sets out possible measures to consider to
exclude short-circuit failures between conductors.
The overall system
The instructions regarding the cabling and grounding when installing the
system are described in chapter
8. INSTALLATION
in this manual.