1592001830 XC645D GB r3.4 04.09.2017.docx XC645D 26/50
Fon Time delay between the insertion of two different fans (0÷255sec).
FoF Time delay between switching off of two different compressors (0÷255 sec)
LSF Minimum set point for fan: The measurement unit depends on dEU parameter. It sets
the minimum value that can be used for the set point, to prevent the end user from setting
incorrect values.
HSF Maximum set point for fan: The measurement unit depends on dEU parameter. It sets
the maximum acceptable value for set point.
17.8 Alarms – compressor section
PAo: Alarm probe exclusion at power on. it is the period starting from instrument switch on,
before an alarm probe is signaled. (0÷255 min). During this time if the pressure is out of
range all the compressor are switched on.
LAL: Low pressure (temperature) alarm – compressor section: The measurement unit
depends on dEU parameter: (PA04 ÷ HAL bar; -50.0÷HAL °C; PA04÷HAL PSI; -58÷HAL
°F) It’s independent from the set point. When the value LAL is reached the A03C alarm
is enabled, (possibly after the tAo delay time).
HAL: High pressure (temperature) alarm– compressor section: The measurement unit
depends on dEU parameter: (LAL ÷ PA20 bar; LAL÷150.0 °C; LAL÷PA20 PSI; LAL÷302
°F). It’s independent from the set point. When the value HAL is reached the A04C alarm
is enabled, (possibly after the tAo delay time).
tAo: Low and High pressure (temperature) alarms delay– compressor section: (0÷255
min) time interval between the detection of a pressure (temperature) alarm condition and
alarm signaling.
ELP Electronic pressure switch threshold: (-50°C÷STC1; -58°F÷STC1; PA04÷STC1);
Pressure / Temperature value at which all the compressors are switched off. It has to be
set some degrees above the mechanical low pressure switch value, in order to prevent
mechanical low pressure activation.
SEr: Service request: (1÷999 hours, res. 10h; 0 = alarm excluded ) number of running hours
after that the “A14” maintenance call is generated.
PEn: Low pressure-switch intervention numbers: (0÷15). If the low pressure-switch is
enabled PEn times in the PEI interval, the controller is locked. Only the manually
unlocking is possible. See also the alarms table at paragraph 0. Every time the
pressure-switch is enabled all the compressor are turned off.
PEI: Pressure-switch interventions time (0÷15 min) Interval, linked to the Pen parameter,
for counting interventions of the low pressure-switch..
SPr: number of steps engaged with faulty probe. (0÷6).
17.9 Alarms – DLT section
dtL Digital compressor discharge line temperature alarm (alarm referred to the probe set
in the par. dtLi) (0÷180°C; 32÷356°F). If the probe 3 is used to detect the temperature of
the discharge line of the DGS compressor, the compressor is switched off when this
threshold is reached.
dLd Digital compressor discharge line temperature alarm delay (alarm always referred to
P3 probe) (0÷15min)
dLH Digital compressor discharge line alarm reset differential (alarm always referred to
P3 probe) (0.1÷25.5°C; 1÷50°F)
dtLi Probe selection for the discharge line temperature monitoring:
nP: function disabled
P3: probe P3 (term. 38-42)
P4: probe P4 (term. 22-23)
dtLP Digital Compressor Capacity percentage in case of discharge line temperature alarm
(0÷80%; with 0 the compressor is stopped)
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