dIXEL
Operating instruction manual
1592019010
1592019010 XEV11D GB r1.2 2008.07.08.doc
XEV11D
2/4
LED
MODE
Function
VALVE
OFF
Valve is closed
ALARM
ON Alarm
present
ALARM
OFF
There is no alarm
5.
USER INTERFACE
5.1
TO SEE THE READ-ONLY PARAMETERS
1)
Press and release
o
key;
2)
First read-only label is showed;
3)
Slide labels with
o
or
n
arrows;
4)
Press
SET
to see read-only value, to change value to see press
SET
5)
To leave, press and release
o
+
SET
or wait time-out of about 3 minutes.
5.2
TO SEE THE SET POINT
1)
Press the
SET
key until the set point will be showed;
2)
To come back to see temperature, wait about 5s or press newly
SET
key.
5.3
TO MODIFY THE SET POINT
To change the set point value operate as follows:
1)
Press the
SET
key until the set point will be showed;
2)
Use
o
or
n
to change its value.
3)
Press “
SET
” to store the new value.
5.4
TO GO TO “PR1” PARAMETERS
To enter in “Pr1” level menu:
1)
Pressing
SET
+
n
keys for about 3 seconds.
2)
Instruments shows first parameter in Pr1 menu
5.5
TO GO TO “PR2” PARAMETERS
To enter to “Pr2” parameters list:
1.
Enter to “Pr1”
2.
Select “Pr2” parameter and press SET
3.
The “PAS” label will be shown, then “0 - - “ with 0 blinking.
4.
Insert “321” password through
o
and
n
keys
,
then press SET to
confirm.
5.6
TO
MODIFY THE PARAMETERS VALUE
To change the parameter’s value operate as
follows:
1.
Enter the Programming mode by
pressing the Set and DOWN key for
about 3s.
2.
Select the required parameter.
3.
Press the “
SET
” key to display its value
4.
Use
o
or
n
to change its value.
5.
Press “
SET
” to store the new value and move to the following parameter.
To exit
: Press
SET +
o
or wait 30s without pressing a key.
NOTE
: the set value is stored even when the procedure is exited by waiting the time-out to expire.
6.
PARAMETERS LIST
NOTE: All pressure parameters are relatives or absolutes depending on PrM parameter.
REGULATION
FtY
Kind of gas (
R22, 134, 404, 407, 410, 507, CO2): Type of gas used by plant.
Fundamental parameter for correct functioning
of all system
.
PEO
Probe Error opening percentage:
(0÷100%) if a temporary probe error occurs, valve
opening percentage is
PEo
until
PEd
time is elapsed.
PEd
Probe Error delay before stopping regulation:
(0÷239 sec. – 240=unlimited) if probe
error duration is bigger than
PEd
then valve totally closes. If
PEd=240
valve opening is
PEo
until probe error finishes.
ESF
Enable Start Function:
(n÷Y) n= when digital input configured as CCL is activated, normal
regulation starts immediately; Y= when digital input configured as CCL is activated valve
opens with
OPE
percentage for time
SFd.
OPE
Start opening Percentage:
(0÷100%) Opening valve percentage when start function is
active and during post defrost phase. This phase duration is
SFd time
.
SFd
Start Function duration: (0.0÷42.0
min: tens of seconds)
It sets start function duration
and post-defrost duration.
During this phase the alarms are neglected
ind
injection delay: (0.0÷42.0
min: tens of seconds)
view paragraph 3.1
dSH delta
SuperHeat:
(0.1÷10°C / 1÷50°F) view paragraph 3.1
dOP
delta Opening Percentage:
(0÷100%) view paragraph 3.1
inb injection
behaviour:
(rEG ÷ cL) when an injection problem is signalled if
inb=cL
valve will
close completely, if
inb=rEG
valve will regulate normaly by PI (see paragraph 3.1).
Sti
Stop regulation interval: (0.0÷24.0
hours: tens of minutes)
after regulating
continuously for
Sti
time, the valve closes for
Std
time in order to prevent ice creation.
Std Stop
duration:
(0÷60 min.) it defines stop regulation time after
Sti.
During this stop display
shows
StP
message
MnF
Maximum opening percentage at normal Functioning:
(0÷100%) during regulation it
sets the maximum valve opening percentage.
FOt Forced
Opening
time-out
:
(0.0÷24.0
hours: tens of minutes)
If Plant starting function is
enabled for all
FOt
time the function is disabled automatically, see
Plant starting function
paragraph.
PI PARAMETERS (trained staff)
CyP Cycle
Period:
(1 ÷ 15s) it permits to set cycle time.
Pb Proportional
band:
(0.1 ÷ 50.0 / 1÷90°F)
PI proportional band
rS Band
Offset:
(-12.0 ÷ 12.0°C / -21÷21°F) PI band offset
inC Integration
time:
(0 ÷ 255s) PI integration time
PROBE PARAMETERS
tPP
type of Pressure transducer: (PP – LAn)
it sets
type of pressure transducer to use:
PP=
4÷20mA pressure transducer or ratiometric transducer 0÷5V,
LAn=
the pressure signal
arrives from another XEV module.
PA4
Probe value At 4mA or At 0V:
(-1.0 ÷ P20 bar / -14 ÷ PSI / -10 ÷ P20 kPA*10) pressure
value measured by probe at 4mA or at 0V (related to PrM parameter)
P20
Probe value 20mA or At 5V:
(PA4 ÷ 50.0 bar / 725 psi / 500 kPA*10) pressure value
measured by probe at 20mA or at 5V (related to PrM parameter)
oPr
Pressure probe calibration:
(-12.0 ÷ 12.0 bar / -174÷174 psi / -120 ÷ 120 kPA*10)
ttE
type of tEmperature probe:
(PtM ÷ Ntc) it allows to set the kind of probe used by the
instrument:
PtM
= Pt1000,
ntC =
NTC probe.
otE
Temperature probe calibration:
(-12.0 ÷ 12.0 °C / -21÷21 °F)
DIGITAL INPUTS
i1P
Digital Input 1 (Free of voltage) digital input polarity:
(cL,OP)
CL
= activated when
closed;
OP
= activated when opened
i1F
Digital Input 1 (Free of voltage) digital input function:
(CCL, rL, dEF)
CCL=
cooling
call;
rL=
digital input activates relay;
dEF=
digital input signals that defrost is active
d1d
Digital Input 1 (Free of voltage) activation delay:
(0÷255 min.)
this activation delay is
used only if digital input is configured as rL
i2P
Digital Input 2 (High voltage) digital input polarity:
(CL,OP)
CL
= activated when closed;
OP
=activated when opened
i2F
Digital Input 2 (High voltage) digital input function:
(CCL, rL, dEF)
CCL=
cooling call;
rL=
digital input activates relay;
dEF=
digital input signals that defrost is active
d2d
Digital Input 2 (High voltage) activation delay:
(0÷255 min.) this activation delay is used
only if digital input is configured as rL
ALARM
dAO
Alarm delay after restarting regulation: (0.0÷42.0
min: tens of seconds)
time between
digital input activation (configured as CCL) and alarm signalling
tdA
Type of alarm signalled by relay:
(ALL, SH, PrE, di, LOC, inJ)
ALL=
all alarm;
SH=
superheat alarm;
PrE=
pressure alarm;
di=
activation only when digital input configured as
rL
is actived;
LOC=
lock alarm in case of
nPA
events reached;
inJ=
activation in cases of
injection alarm.
LPL
Lower Pressure Limit for superheat regulation:
(PA4 ÷ P20 bar / psi /
kPA*10
) when
suction pressure comes down to LPL the regulation is performed with a LPL fixed value for
pressure, when pressure comes back to LPL the normal pressure value is used. (related to
PrM parameter)
MOP
Maximum Operating Pressure threshold:
(PA4 ÷ P20 bar / psi /
kPA*10
)
if suction
pressure exceeds maximum operating pressure value, instrument signals situation with
alarm LED
. (related to PrM parameter)
LOP
Lowest Operating Pressure:
(PA4 ÷ P20 bar / psi /
kPA*10
) if the suction pressure
comes down to this value a low pressure alarm is signalled with alarm LED
. (related to
PrM parameter)
PHy
Pressure alarm Hysteresis:
(0.1 ÷ 5.0 bar / 1÷ 72 PSI / 1÷50
kPA*10
) alarm hysteresis
to disable alarm signalling.
dML delta
MOP-LOP:
(0 ÷ 100%) when a MOP alarm occurs valve will close of the dML
percentage every cycle period until MOP alarm is active. When LOP occurs valve will open
of the dML percentage every cycle period until LOP alarm is active.
tPA
Maximum time between two MOP and/or LOP events: (0.0÷42.0
min: tens of
seconds)
time interval to calculate the number of the pressure switch activation.
nPA
Number of events before locking:
(0=Off ÷ 100) number of MOP or LOP events, during
the “
tPA
” interval, before locking instrument.
MSH
Maximum SuperHeat alarm:
(LSH÷32,0°C / LSH÷176°F) when superheat exceeds this
value an high superheat alarm is signalled after interval
SHd
LSH
Lowest SuperHeat alarm:
(0.0÷MSH °C / 32÷MSH °F) when superheat goes down to this
value a low superheat alarm is signalled after interval
SHd
SHy
SuperHeat alarm Hysteresis:
(0.0÷25.5°C / 1÷77°F) hysteresis for superheat alarm
deactivation
SHd
SuperHeat alarm activation delay:
(0÷255s) when a superheat alarm occurs, the time
SHd have to pass before signalling alarm
FrC Fast-recovery
Constant:
(0÷100s) permits to increase integral time when SH is below the
set-point. If
FrC=0
fast recovery function is disabled.
DISPLAY
Lod
Local display:
(SH, PEr, P1, P2)
SH=
superheat;
PEr =
valve
opening percentage;
P1=
value of temperature measured;
P2=
pressure measured by P2 probe;
CF
Temperature measurement units:
(°C÷°F)
°
C=
Celsius degree;
°F=
Fahrenheit degree;
ATTENTION:
by changing measurement unit, the regulation parameters have to be
correctly changed
PMu
Pressure Measurement units:
(bAr, PSI, kPA*10)
bAr=
bar;
PSI=
psi;
PA= KPa*10
;
ATTENTION:
by changing measurement unit, the regulation parameters have to be
correctly changed
PrM
Pressure visualization Mode:
(rEL÷AbS)
rEL=
relative pressure;
AbS=
absolute
pressure;
CLt
CooLing time statistic:
(0÷48h) time interval used to evaluate a cooling call statistic.
During this time comes calculated how much time the cooling call is remained active
CLP
CooLing Percentage (read only):
Display the percentage of time during which the cooling
call was active in the time interval defined by
parameter
CLt
tP1
temperature Probe value (read only):
it shows temperature probe value from P1
