Rev.06
– 03/02/2021
Pag. 21/37
Codes: 71380 - 71381
21.
SAFETY DEVICES AND SYSTEM ON BOARD
In order to provide the highest safety condition to the user SCOOTER includes technical solutions and devices
designed to eliminate or minimize the risks during the usage.
21.1. TORQUE LIMITING DEVICE AT THE PROPELLER
A torque-limiting device is installed between the motor and the propeller. When the resistance felt by the propeller
exceeds a certain torque, this device is triggered, preventing the propeller from rotating.
The device will generate a rhythmic sound signalling its insertion.
21.2. ELECTRICAL AND MECHANICAL SAFETY SYSTEMS
The electronic engine control board includes:
•
A short circuit emergency fuse (substitution by the maintenance service)
•
Temperature sensor: it slows propeller rotation to a stop, the system automatically restarts when the engine is
cooled;
•
Maximum absorbed current sensor: threshold to the maximum current the electrical engine can adsorb, fully
automatic, to protect electronic parts;
•
Motor start sensor for trigger without mechanical contacts (the sensor is not reed or mechanical, but inductive).
21.3. CUT OFF BATTERY PROTECTION SYSTEM
SUEX batteries integrate an electronic protection system inside to prevent the accidental total discharge of the battery
itself.
The cut-off system is an electronic system design to prevent the battery from the accidental fully discharge; it is
placed into the battery and connected in series between the battery elements and the motor.
It function is to avoid the scenario of an excessive cells discharge with possible voltage inversion at one or more
cells, which consequences would be destructive for the battery pack itself and severely hazardous for people and
goods.
During the cells discharge the voltage lowers till a threshold value imposed at which the cut-off interrupts the current
flow, so impeding a further reduction of the voltage level.
When the cut-off activates the battery does no more supply energy to the motor connector.
To reset the situation and be able to use the battery again the battery has to be recharged by mean of its proper
recharger (see. Charger user instructions) and then reconnected to the SCOOTER.
The cut-off event is to be considered exceptional: it should not occur during normal battery use as the correct
SCOOTER usage does not requires excessive energy drain from the battery.
For a complete description of the CUT - OFF, please refer to the battery user manual which completes this manual
and forms an integral part of it.
If this situation occurs:
- release the trigger immediately,
- switch off the power by means of the main switch (OFF)
- free the propeller of the foreign body.
Do not keep the torque limiter that is designed for use in an emergency and keep
running for longer than 10 seconds could cause damage.
NOTE: It is allowed to extract the foreign body from the propeller during the dive,
ONLY IF the conditions of use allow it and in total safety: if not, leave the
SCOOTER.
NEVER lubricate the safety device.
