Zapi COMBI AC1, User Manual

Page: 20 / 86

4.3.2 Safety Features
U
ZAPI controllers are designed according to the prEN954-1 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.
COMBI AC1 electronic implements a double µC structure. The second µC main
task is to check correct functionality of the first µC, whose main task is to control
traction AC motor. In more detail:
-
first microcontroller manages Ac traction motor control and
hydraulic safety
related functions.
second microcontroller manages Dc
traction safety related functions.
- pump motor control, valves control and
Basically, the two microcontrollers implement a double check control of the
main functions.
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. Th
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,
is
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
evice.
generated or received by an electrical
1)
d
So the analysis works in two directions:
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
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