Fagor DDS APS-24, Hardware Manual

Page: 323 / 406

   Functional safety
FUN
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Cabl
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9.
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· 323 ·
DDS
HARDWARE
9.9 Cabling and grounding
Safety functions
The following recommendations must be taken into account when designing
the safety functions:
 See · Drive Enable electrical protections ·.
 Try keeping power cables and signal cables apart from each other.
 - KM1 contactor in case of high current: Install an intermediate
auxiliary relay to activate the coil of the contactor for high power units
were the consumption current and peak current of the external main
contactor is significant; although the mirror contact in series with the ON
button must belong to the external main contactor, never to the
intermediate relay.
Exclusion of wiring malfunctions
The table D.4 of EN ISO 13849-2 sets out possible measures to consider to
exclude short-circuit failures between conductors.
The following measurement from the table can be applied to the cables
connected between the drive and the external safety controller but not for the
holding brake cables that go to the motor that is outside of the enclosure.
They can be excluded if the drive and the external safety controller are
within the same electrical enclosure. Provided both the conductors and
enclosure meet the appropriate requirements ·see IEC 60204-1·.
The Power Drive System, in general
The instructions regarding the cabling and grounding when installing the
system are described in chapter
8. INSTALLATION in this manual.