Page - 16/100 AE0ZP0EC - AC-0 SSL SENSORED - User Manual
safety reasons.
- Connection Errors:
All inputs are protected against connection errors.
- Thermal protection
If the controller temperature exceeds 78 °C, the maximum current is reduced
in proportion to the thermal increase. The cut off temperature is 100 °C.
- External agents:
The inverter is protected against dust and the spray of liquid to a degree of
protection meeting IP54.
- Protection against uncontrolled movements:
The main contactor will not close if:
- The Power unit is not functioning.
- The Logic is not functioning perfectly.
- The output voltage of the accelerator does not fall below a threshold is
1V higher than the minimum voltage value stored with the PROGRAM
VACC operation.
- Running microswitch in closed position.
- An important improvement against the uncontrolled movements is given
by the Passive Emergency Cell (see paragraph 4.3.3 below).
- Low battery charge:
In the encoder release, when the battery charge is low, the maximum speed
is reduced to the 25% of the maximum programmed. The Lifting Operation
inhibited.
- Protection against accidental Start up
A precise sequence of operations are necessary before the machine will
start.
Operation cannot begin if these operations are not carried out correctly.
Requests for drive, must be made after closing the key switch.
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.
AC-0 inverter electronic implements an hardware safety circuit, which is able to
switch off the three phase Power Bridge stopping the machine via HARDWARE,
that is bypassing the software control.
This safety Circuit is actuated releasing the Tiller Switch and the handling is
descripted in detail in the next Paragraph (see paragraph 4.3.3 PASSIVE
EMERGENCY CELL).
4.3.3 Passive emergency cell
The Tiller Switch input is processed by two separated devices: the uC and a PLD
(GAL). When the Tiller Switch turns open, both, the uC and the PLD device
switch off the power mosfets distinctly one from the other. The PLD does that
with a delay of 800 msec. So, this PLD is a separate device (distinct from the uC)
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