OI_EC2-XC645CX_A1_A2L_A3_EN_Rev01_866933.docx EC2-XC645CX 26/54
PMU Measurement unit for pressure: it is used only with dEU = PrS, and it set the
measurement unit for parameters referred to temperature/pressure.
bar = bar
PSI = PSI
PA = kPA
rES Resolution for °C and bar (in = integer; dE = decimal point)
dFE Pressure filter enabling: YES = enabled; no = not enabled; This filter takes in account
the average value of the pressure during the last cycle for the regulation.
dEU1 Default visualization for upper display: PrS = Pressure; tPr = temperature
dSP2 Probe selection for lower display: nu = display switched off; P1 = Probe 1; P2 =
Probe 2; P3 = Probe 3; P4 = Probe 4; StC1 = Compressor Set Point; StC2 = NOT SET
IT; SetF = Fan set point
dEU2 Default visualization for lower display: PrS = Pressure; tPr = temperature
17.5 Compressor regulation
Pbd Proportional band or neutral zone width (0.1 - 5.0 bar; 0.5 – 30 °C or 1 – 150 PSI;
1 – 50 °F) The band (or zone) is symmetrical compared to the target set point, with
extremes: set-Pbd/2 - set+Pbd/2. It is used as proportional band for PI algorithm.
The measurement unit depends on the dEU, CF, PMU par.
rS Proportional band offset: PI band offset. It permits to move the proportional band of the
PI. With rS = 0 the band is between Set-Pbd/2 - Set+Pbd/2;
inC Integration time: (0 – 999 s) PI integration time
dGSP Digital compressor always activated at first:
no: other compressors if available are allowed to start when the digital compressor is
locked by safety timers. This allows the system to satisfy the cooling demand when the
digital compressor is unavailable.
yES: the digital compressor is always started as first. If unavailable due to safety timers
the regulation will be locked till timers will be over.
SUt Start up time: The digital scroll valve is energized for the SUt when the compressor starts
(0 - 3 s)
tdS Digital scroll cycle time: (10 - 40 s) it sets the cycle time for the digital scroll (DGS) valve
modulation.
PM DGS minimum capacity (10 - PMA with dGty = ScrL; 0 - PMA = dGty = StrM): it sets the
minimum capacity allowed to the digital compressor.
If digital SCROLL is used dGt = SCrL the allowed range is 10 - PMA
If digital STREAM is used dGt = StrM the allowed range is 0 - PMA
PMA DGS maximum power (PM - 100) it sets the maximum capacity allowed to the DGS
ton DGS at maximum PMA capacity before starting a new load (0 - 255 s)
toF DGS at minimum PM capacity before stopping a load (0 - 255 s)
MinP Minimum allowed DGS capacity for poor lubrication monitoring (0 - 100%; with 0
function excluded) If the DGS compressor works for the tMIn time with a capacity (in
percentage) equal or lower than MinP, it is forced to work at 100 % for the tMAS time in
order to restore the right lubrication.
tMin Maximum DGS functioning time at a capacity lower than MinP, before working at
full capacity (PMA) (1 - 255 min)
tMAS Time of DGS functioning at maximum capacity (PMA) to restore the right
lubrication (1 - 255 min)
ESC Energy saving value for compressors: (-20 - 20 bar; -50 - 50°C) this value is added 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 – 255 min).
Note: usually onon is greater than oFon.
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