Safety Devices - Frigomat PEB 30 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 mixer motor when the tank cover is opened;
Motor reliability of service: realized by means of overload relays, which can be manually
reset. They protect the machine motors against overloads and the pushbuttons STOP and
TER contemporarily light up. An acoustic signal (beep) is issued every 10 seconds. To
reach the overload relay, press the reset pushbutton once or twice at the most to avoid
burning the motor winding.
Auxiliary circuit supply safety system (24 V): realized by means of an insulating
transformer according to the European Standards in force. In case of trouble it prevents
the primary circuit voltage from being present on the auxiliary elements (probes, logic unit,
solenoid valves, etc.).
Protection against auxiliary equipment short-circuit: realized by means of modular
magneto-thermal circuit-breakers, that trip in case of short-circuit on the logic unit or on the
auxiliary power supply.
The cut-off function is automatically restored after removing the problem making the safety
system trip.
Glycol circuit alarm: when the machine is in STOP position and the FLU led is lighted up,
the glycol circuit is in trouble (opened water valve and blocked pump).
Fluid level alarm: when the FLU led blinks the level of fluid has reached the bottom and it
is necessary to check the circuit.
Safety thermostat alarm: when the machine is in STOP position and the TER led is
lighted up, the fluid safety thermostat or one of the motor protection has tripped.
Temperature probe alarm: when the machine is in STOP position and the TEM led is
lighted up, the temperature probe circuit does not correctly work.
In any case the machine carries out a series of tests during production:
Logic unit self-reset in case of lack of power supply
• Diagnosis of control panel flashing signal lights: all leds present on the panel light up for
10 seconds at each current reset and show the operator their functions. Press any key
to exit this function.
• Automatic reset of the previously set-up function.
Logic unit self-diagnosis (watch-dog)
• Microprocessor diagnosis and maintenance of program data: it controls possible
internal troubles and stops the card in case of failure.
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