Zapi COMBI AC1 Instrukcja Użytkownika Pobierz pdf (Strona 11)

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5 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.

AC1 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 5.1 PASSIVE

EMERGENCY CELL).

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.

5.1 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 800msec. So, this PLD is a separate device (distinct from the uC)

that automatically prevent operation of the travel circuit when the operator leaves

the truck.

Figure 5–1

One of the reason for the adoption of this Passive Emergency cell is to comply

with the EN1175-5.9.5: “A separate device indipendent of the speed control

device (accelerator) shall automatically prevent operation of the travel circuit

when the operator leaves the truck, e.g. seat switch, pedestrian tiller switch”. To

be sure this separate device really prevent operation of the travel circuit, it is

necessary a redundant device (togheter with the Elaboration Unit) reads this

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Zapi COMBI AC1 Instrukcja Użytkownika Strona 11