3 U SAFETY AND PROTECTION
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.
AC-2 inverter electronic implements an hardware safety circuit, which is able to
open the Line Contactor (LC) and the Electric Brake (EB) - and therefore to cut
the power line stopping the machine via HARDWARE, that is bypassing the
software control of the LC and EB. This safety circuit is driven by "SAFETY" input
(see next chapter). If safety input is connected to -BATT, the "SAFETY" circuit is
inactive; if the input is open, the "SAFETY" circuit becomes active and, within a
timeout, it is able to open the drivers of LC coil and EB coil. The safety circuit is
also periodically checked by the AC-2 microcontroller; if the microcontroller
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.
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.
Page - 12/64 ADEZP0AE - AC-2 INVERTER - User Manual
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