AFFZP0BB – ACE3 – User Manual Page – 37/139
6.3.2 Safety Features
U ZAPI controllers are designed according to the prEN954-1 specifications for
safety related parts of the control system and according 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 customers 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.
The machine manufacturer holds the responsibility for the truck safety
features and related approval.
6.4 EMC
U EMC and ESD performances of an electronic system are strongly influenced
by the installation. Special attention must be given to lengths, paths and
shielding of the electric connections. These aspects are beyond of Zapi
control. Zapi can offer assistance and suggestions on EMC related problems,
basing on its long experience. However, ZAPI declines any responsibility for
non-compliance, malfunctions and failures, if correct testing is not made. The
machine manufacturer holds the responsibility 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 deals with the electromagnetic
behavior of an electrical device, both in terms of emission and reception of
electromagnetic waves that may cause electromagnetic interference with the
surrounding electronics.
So the analysis works in two directions:
1) The study of the emission problems, the disturbances generated by the device
and the possible countermeasures to prevent the propagation of that energy; we
talk about “conduction” issues when guiding structures such as 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 at high frequency which can generate RF energy. However wires
have the key role to propagate disturbs because they work as antennas, so a
good layout of the cables and their shielding can solve the majority of the
emission problems.
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