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4. SAFETY DEVICES
Shearing prevention system: realised by means of microswitches and safety circuit; it
stops the machine when the door is opened and/or the grid on the hopper is lifted.
Motor reliability of service: realized by means of overload relays with automatic reset.
They protect the agitator and compressor motors against overloads by stopping the
machine. STOP pushbutton lights up and DELIVERY pushbutton starts blinking.
Auxiliary circuit supply safety system (24 V): realized by means of glass quick-blow
fuses 5x20. They trip in case of short-circuit on the logic unit or on the auxiliary power
supply.
In any case the machine carries out a series of tests during production:
Production control system
Carried out by the microprocessor through a current transformer. It controls the agitator
motor watt.
Batch freezing safety timer
It operates 16 minutes after the beginning of batch freezing in case the consistency
minimum value set up by the manufacturer is not reached. It stops the machine and makes
STOP and PRODUCTION pushbuttons light up. In this case check the presence of
troubles in the refrigerant circuit and/or check the proportion of the batch.
Lack of growth in consistency
It operates if the batch stops increasing in consistency due to a wrong proportion of
ingredients or due to a non-uniform amalgamation, after the minimum alarm threshold is
overcome. The compressor stops, the agitator keeps on running, the PRODUCTION
pushbutton blinks and an intermittent beep is released.
Current transformer reliability of service
It operates in case the current transformer is disconnected or broken down. It stops the
machine and makes STOP pushbutton blink. If the production is in progress, the
PRODUCTION pushbutton starts blinking and an intermittent beep is released to signalize
the max. consistency.
Compressor motor reliability of service
It signalizes that the compressor motor is broken down. It stops the machines and makes
STOP pushbutton light up and PRODUCTION pushbutton blink.
Logic unit self-reset in case of lack of power supply
It stops the machine allowing the manual reset of the functions.
Logic unit self-diagnosis (watch-dog)
It controls possible internal troubles and stops the card in case of failure.