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External communication
By mean of the TTL connector it is possible to connect the unit through a ModBUS-RTU compatible
net to a XWEB300 monitoring system. Same TTL input is used to download or upload parameter data
from a “Hot key”.
Alarm signals
Message Cause Output
P1
Thermostat probe failure Alarm output ON; Compressor according to parameters “COn” and “COF”
P2
Evaporator probe failure Alarm output ON; Other outputs unchanged
P3
Ambient probe failure Alarm output ON; Other outputs unchanged
HA
Maximum temperatura alarm Alarm output ON; Other outputs unchanged
LA
Minimum temperatura alarm Alarm output ON; Other outputs unchanged
EE
Data orm emory failure Alarm output ON; Other outputs unchanged
dA
Door switch alarm Alarm output ON; Other outputs unchanged
PAL
Pressure switch alarm Alarm output ON; Other outputs OFF
CSd
Condenser alarm Alarm output ON; Other outputs unchanged
EAL
Delete of electronic board data Alarm output ON
Alarm recovery
Depending on the entered option in parameter “tBA”, alarm signals are turned off by pressing any key
or when the alarm cause ceases.
Probe alarms: “P1” (probe1 faulty), “P2” and “P3” automatically stop 10s after the probe restarts
normal operation.
Temperature alarms “HA” and “LA” automatically stop as soon as the thermostat temperature returns
to normal values or when the defrost starts.
Door switch alarm “dA” stops as soon as the door is closed.
Pressure alarm “PAL” is recovered by switching OFF the instrument.
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