Operating instructions
cod. 1592011000
1592011000 XC706M GB 31-08-2001
rel. 1.0
Pa. 13 / 23
1 =entering the resources established by means of SPr or PoPr parameters.
SPr: number of steps engaged with faulty probe. (0÷CpnU) It’s used only if CtyP=1.
PoPr:
capacity engaged with faulty probe (0÷255) It’s used only if CtyP=0.
5.2.5
User interface
rELP Suction pressure displaying:
AbS = absolute pressure;
rEL = relative pressure, in this case the absolute value is decreased by 1.02bar
Loc: keyboard lock: no = keyboard enabled;
yES = keyboard lock
dLI
Data logger interval for recording(1÷60 sec)
Adr: Controller address (1 –247) It is used in monitoring system.
PSo: Security code for operative parameters (0÷255; with 0 the security code is disabled)
5.3 Relations amount parameters
Parameter
CtyP
Value
Displayed
Hidden
CtyP = 0
Cp1, ..., CPx, PoPr
CPSt, rty e sty, SPr.
CtyP = 1
CPSt, rty e sty, SPr
Cp1, ..., CPx, PoPr
where x is CPnu value
Parameter
Cdn
Value
displayed
hidden
Cdn = 0
don, doF
don1....donx, doF1...doFx
Cdn = 1
don1....donx,
doF1...doFx
don, doF
where x is Cpnu value
6. Type of regulation
6.1 Dead
band
This kind of regulation is available for all kinds of loads. The neutral zone (Pbd) is symmetrical
compared to the target set point, with extremes: set+Pbd/2 ... set-Pbd/2. If the pressure
(temperature) is inside this zone the controller maintains the same number of loads switched on
and off, without changing anything.
When the pressure (temperature) go out from the zone, regulation starts. If the pressure is
greater than SET+Pbd/2, the loads are switching on with timing given by parameters: don and
doF. (don1÷don6, doF1÷doF6 if Cdn=no).
A load is turned on only if the his safety times onon, oFon, donF are over.
Regulation stops when the pressure (temperature) come back into the neutral zone.
In the following a simplify exemplum that explains the regulation in neutral zone for compressor
homogeneous with 1 step for each compressors. The safety times onon, oFon and donF are
not considered. In the real regulation the a load is entered or turned off only if these times are
over.
