Translation of the original instructions
77
FRIULINOX ALI GROUP S.R.L. A SOCIO UNICO
Via Treviso 4 - 33083 Taiedo di Chions (PN) - Italy
Service
M
an
u
al
10.1.8.
Compressor thermal alarm (only for models that require it)
At the end of the fault, the alarm is reset manually or automatically based on the component that triggered the alarm
and the alarm relay is deactivated
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Compressor thermal alarm
is a machine block alarm (the blast chilling cycle in progress immediately ends. The compressor, the
fans and the heaters are immediately deactivated, and the buzzer and the alarm relay are activated).
On single-phase models the input is deactivated. On three-
phase models it can be caused by the circuit breaker “Y1” or by the
Kriwan protection system inside the compressor
1.
Reasons for which the “P” safety pressure switch trips:
Tripping of the circuit breaker “Y1” (on three
-phase models). The protection intervenes when the compressor (A) absorption
exceeds the set value. The circuit breaker “Y1” is reset manually, while the Kriwan system is automatically reset when the
temperature returns.
Check, with alarm reset, that the three phases are present on the compressor with the correct voltage
Lacking one or more phases, check the main power supply and correct operation of the contactor “K1”
→
see wiring diagrams
- replace it if necessary
Check that the compressor works properly when powered
If the compressor has trouble starting or is locked (rotor locked), proceed with the replacement
If the circuit breaker has not tripped and the safety pressure switch has not intervened, make sure there is no
false contact on the Y1 contact that takes the alarm on the card. With NO contact alarm on the card
If the circuit breaker has not tripped, NC contacts, the cause is the faulty digital input of the board. Replace the electronic card
