Page – 36/139 AFFZP0BB – ACE3 – User Manual
- If a mechanical battery line switch is installed, it is necessary that the key supply
to the inverter is open together with power battery line; if not, the inverter may
be damaged if the switch is opened during a regenerative braking.
- An intrinsic protection is present against battery voltages above 140% of the
nominal one and against the key switching-off before disconnecting the battery
power line.
6.2.9 Insulation of truck frame
U As stated by EN-1175 “Safety of machinery – Industrial truck”, chapter 5.7,
“there shall be no electrical connection to the truck frame”. So the truck frame
has to be isolated from any electrical potential of the truck power line.
6.3 Protection and safety features
6.3.1 Protection features
The ACE3 inverter is protected against:
- Battery polarity inversion
It is necessary to install a main contactor in order to protect the inverter against
reverse battery polarity and for safety reasons.
- Connection errors
All inputs are protected against connection errors.
- Thermal protection
If the controller temperature exceeds 85 °C, the maximum current is reduced in
proportion to the temperature excess. Also, the temperature can never exceed
105 °C.
- External agents
The inverter is protected against dust and sprays with a degree of protection
meeting IP65.
- Protection against uncontrolled movements
The main contactor will not close if:
- The power unit is not functioning.
- The logic unit is not functioning.
- The output voltage of the accelerator does not fall below the threshold given
by the minimum voltage value stored during the adjustment procedure, plus
1 V.
- One drive microswitch (forward or backward) is closed.
- Low battery charge
When the battery charge is low, the maximum current is reduced to half of the
maximum programmed current.
- Protection against accidental start up
A precise sequence of operations are necessary for the machine to start.
Operation does not begin if they are not correctly carried out.
Requests for drive must be made after closing the key switch.
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