AFCZP0BC – COMBIACX & ACEX - User Manual Page - 19/81
4.3.2 Safety Features
U ZAPI controllers are designed according to the EN13849-1 specifications for
safety related parts of control system and to UNI EN1175-1 norm. The safety of
the machine is strongly related to installation; length, layout and screening of
electrical connections have to be carefully designed.
ZAPI is always available to cooperate with the customer in order to evaluate
installation and connection solutions. Furthermore, ZAPI is available to
develop new SW or HW solutions to improve the safety of the machine,
according to customer requirements.
Machine manufacturer holds the responsibility for the truck safety features
and related approval.
4.4 EMC
U EMC and ESD performances of an electronic system are strongly influenced
by the installation. Special attention must be given to the lengths and the
paths of the electric connections and the shields. This situation is beyond
ZAPI's control. Zapi can offer assistance and suggestions, based on its years
experience, on EMC related items. However, ZAPI declines any responsibility
for non-compliance, malfunctions and failures, if correct testing is not made.
The machine manufacturer holds the responsability to carry out machine
validation, based on existing norms (EN12895 for industrial truck; EN50081-2
for other applications).
EMC stands for Electromagnetic Compatibility, and it represents the studies and the
tests on the electromagnetical energy generated or received by an electrical device.
So the analysis works in two directions:
1) The study of the emission problems, the disturbances generated by the device
and the possible countermeasure to prevent the propagation of that energy; we
talk about “conduction” issues when guiding structures such wires and cables
are involved, “radiated emissions” issues when it is studied the propagation of
electromagnetic energy through the open space. In our case the origin of the
disturbances can be found inside the controller with the switching of the mosfets
which are working at high frequency and generate RF energy, but wires and
cables have the key role to propagate the disturbs because they works as
antennas, so a good layout of the cables and their shielding can solve the
majority of the emission problems.
2) The study of the immunity can be divided in two main branches: protection
from electromagnetic fields and from electrostatic discharge.
The electromagnetic immunity concern the susceptibility of the controller with
regard to electromagnetic fields and their influence on the correct work made by
the electronic device.
There are well defined tests which the machine has to be exposed to.
These tests are carried out at determined levels of electromagnetic fields, to
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