Safety Devices - Frigomat T4s 05 Manuel D'utilisation Et D'entretien

4. SAFETY DEVICES

Shearing prevention system: realized by means of a NO micro-switch in conformity with
the European standard; it stops the machine when the door is opened and/or the grid on
the hopper is lifted and visualize EME on the display.
Beater motor safety system: it consists of overload relays with automatic reset. They
protect the beater motor against overloads by stopping the machine. As a consequence,
the TER alarm appears on the display.
Compressor motor safety system: It consists of overload relays with automatic reset.
They protect the beater motor against overloads by stopping the machine. As a
consequence, the TER alarm appears on the display.
Auxiliary circuit supply safety system (24 V): it consists of 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 safety timer (no-growth alarm)
It starts 35 minutes after the beginning of the production in case the minimum consistency
value set up by the manufacturer is not reached. The machine stops and an alarm
message (M-C) appears on the display. In this case check the presence of troubles in the
refrigerant circuit and/or check the proportion of the batch.
DELIVERY safety timer
It starts 30 minutes after the beginning of theDELIVERY function: as a consequence the
machine stops.
Protection against voltage drops
It operates when the machine is in production mode. Whenever the voltage drops more
than 20% the protection system resets the machine to protect the electric components.
The machine automatically comes back to operation and all pushbuttons light up as soon
as the voltage returns to the rated values.
Logic unit self-reset in case of lack of power supply
It stops the machine allowing the manual reset of functions.
Logic unit self-diagnosis (watch-dog)
A microprocessor checks for possible internal troubles and stops the electronic board in
case of failure.
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