4 Main function management
4.1 Static return to off
When switching on the lift truck, a number of inputs are analysed to ensure the operator's
safety; if one of these signals indicates a wrong start condition or any likely dangerous
situation, the main breaker is not closed and all the system modes are disabled.
If the anomalous input assumes the correct value, the main breaker is closed and it is then
possible to go on with the usual truck management.
The analysed inputs are the following ones:
1. the directional switch (for a correct system start no direction has to be selected)
2. the accelerator (for a correct system start it has not to be pressed)
4.2 Buzzer management
The buzzer is activated in the following cases:
1. alarm condition
2. switching your device on you find wrong start conditions:
○
accelerator pedal pressed or directional (forward or reverse) switch inserted
4.3 BDI measure management
To measure correctly the battery voltage the following conditions must be true:
1. drive motor still
If this conditions are fulfilled for at least 4 seconds, battery voltage begins to be evaluated,
using a low–pass filtering.
After 15 seconds of voltage processing, the filter output signal is used to evaluate the
battery charge level.
If the battery is discharged for at least two consecutive sampling periods, low battery
voltage alarm is signalled and the motor speed and maximum torque are reduced.
If the alarm is observed switching on the key, the first received pump command is keep
active for 3 seconds and then is disabled.
The battery voltage must exceed an adjustable limit value (called battery reset value) to
return to normal operative condition after a low battery voltage alarm.
PRELIMINARY VERSION 29
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