F
Operating instructions
cod. 1592001330
1592001330 XC642C GB r1.0 07.06.2004.doc
rel. 1.0
Pa. 11 / 21
ES = Energy saving; oFF = instrument shut down; LLi = liquid level alarm
did
Configurable digital input delay
: (enabled only if i1F=LL) 0÷255min
ALIP: Alarm input for compressors and fans polarity
oP
: the digital input is activated by opening the contact;
CL
: the digital input is activated by closing the contact.
ALMr Manual reset of alarms for compressors and fans.
no
= automatic recover of alarm: regulation restart when the correspondent digital input is disabled
yES
= manual recover for the alarms of compressors.
12.3 DISPLAY AND MEASUREMENT UNIT
dEU
:
Default measurement unit for displaying (bar=bar; °C=°C, PSI=PSI; °F=°F)
NOTE1
: The dEU parameter sets the measurement unit also for the set point and the followin
parameters:
CAL, FCAL, Pbd, ESC, LSE, HSE, Pb, ESF, LSF, HSF, LAL, HA, LAF,
HAF
.
rES
Resolution for °C and bar
(
in
= integer;
dE
= decimal point)
rELP Pressure displaying
:
AbS
= absolute pressure;
rEL
= relative pressure.
NOTE
: In this case the pressure displayed, the set point and the following parameters LSE and
HSE, LSF and HSF are automatically decreased by 1.0 bar or 14 PSI
12.4 COMPRESSORS REGULATION
Pbd
:
Proportional band or neutral zone width
(0.10÷5.00bar/0.5÷30°C or 1÷80PSI/1÷50°F)
The band (or zone) is symmetrical compared to the target set point, with extremes: set+Pbd/2 ... set-
Pbd/2. The measurement unit depends on the dEU par.
ESC
Energy saving value for compressors:
(-20÷20bar; -50÷50°C) this value is add to the compressor
set point.
onon
:
Minimum time between 2 following switching ON of the same compressor
(0÷255 min).
oFon
:
Minimum time between the switching off of a compressor and the following switching on
.
(0÷255min).
Note:
usually onon is greater than oFon.
don
:
Time delay between the insertion of two different compressors
(0÷99.5min; res. 10s).
doF:
T
ime delay between switching off of two different compressors
(0÷99.5 min; res. 10s)
donF
:
Minimum time a stage stays switched ON
(0÷99.5 min; res. 10s)
FdLy
:
“don” delay enabled also for the first call.
If enabled, the triggering of the step is delayed for a
“don” value, respect to the call. (
no
= “don” not enabled;
yES
=”don” enabled)
FdLF
“
doF” delay enabled also for the first switching off
. It enables the “doF” delay between the
request of a release and the actual switching off. (
no
= “doF” not enabled;
yES
=”doF” enabled)
odo
:
Regulation delay on start-up:
(0÷255s) on switching ON the instrument starts working after the
time delay imposed in this parameter.
LSE
:
Minimum set point
: 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.
HSE
:
Maximum set point
: The measurement unit depends on dEU parameter. It sets the maximum
acceptable value for set point.
12.5 LIQUID INJECTION THERMOSTAT (TERM. 25-26)
Lit
:
Set point ( °C) for liquid injection thermostat
(0 ÷ 150°C)
Lid
:
Differential for liquid injection thermostat
(0.1 ÷ 10.0)
12.6 ALARMS – COMPRESSOR SECTION
PAo: Alarm probe exclusion at power on.
it is the period starting from instrument switch on, before an
alarm probe is signalled. (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. It’s always subtracted to the set point. When the value
SET-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. It’s always added to the set point. When the value SET+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 signalling.
