Operating instructions
cod. 1592001300
1592001300 XC440C gb r1.0 07.06.2004.doc
rel. 1.0
Page
15 / 28
no= automatic recover of alarm: regulation restart when the correspondent digital input is
disabled
yES = manual recover for the alarms of compressors and fans See also par.
12.4 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
following parameters: CAL, FCAL, Pbd, ESC, LSE, HSE, Pb, ESF, LSF, HSF, LAL, HA,
LAF, HAF..
NOTE2: The controller automatically converts values of set point and following
parameters CAL, FCAL, Pbd, ESC, LSE, HSE, Pb, ESF, LSF, HSF, LAL, HA, LAF,
HAF in the measurement unit set in dEU parameter. In any case after modifying this
parameter it’s better check and modify if necessary the set point and the above
parameters.
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 HSE, LSF and HSF are automatically decreased by 1.0 bar or 14 PSI
12.5 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: Time 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.
