ADBZP0AB - CAN TILLER - User Manual
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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.
3.4 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 electromagnetic 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 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 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
simulate external undesired disturbances and verify the electronic devices
response.
3) The second type of immunity,
ESD
, concerns the prevention of the effects of
electric current due to excessive electric charge stored in an object. In fact,
when a charge is created on a material and it remains there, it becomes an
“electrostatic charge”; ESD happens when there is a rapid transfer from a
