Zapi AC-2 User Manual download pdf (Page 17)

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detects a failure in the "SAFETY" circuit, the microcontroller itself will bring the

machine in a safe status.

Suggested connection of "SAFETY" circuit:

- STANDALONE CONFIGURATION:

it is suggested to connect safety input to

the "SEAT" microswitch or to the "DEADMAN" microswitch (it depends on the

application); in this way the machine will be brought to a safe status as soon as

the operator leaves the machine.

- COMBI CONFIGURATION:

in this case the pump controller acts as

supervisor, checking the traction controller functionality by the CANBUS. So it is

suggested to connect the "SAFETY" input of traction controller to a dedicated

output of pump controller, so that the pump controller can drive the traction safety

input and open the power line in case of malfunctioning of traction controller.

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 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 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.

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