1592023020 XM660K_XM669K GB r1.0 07.01.2013.doc XM660K - XM669K 3/8
- (If RTC is present)Two defrost modes are available through the “tdF” parameter: defrost with
electrical heater and hot gas defrost. The defrost interval is controlled by parameter “EdF”: (EdF =
rtc) defrost is made in real time depending on the hours set in the parameters Ld1..Ld6 in workdays
and in Sd1…Sd6 on holidays; (EdF = in) the defrost is made every “IdF” time;
- defrost cycle starting can be operated locally (manual activation by means of the keyboard or digital
input or end of interval time) or the command can come from the Master defrost unit of the LAN. In
this case the controller will operate the defrost cycle following the parameters it has programmed but,
at the end of the drip time, will wait that all the other controllers of the LAN finish their defrost cycle
before to re-start the normal regulation of the temperature according to dEM parameter;
- Every time any of the controller of the LAN begin a defrost cycle it issue the command into the
network making all the other controllers start their own cycle. This allows a perfect synchronisation of
the defrost in the whole multiplexed cabinet according to LMd parameter;
- Selecting dPA and dPb probes and by changing the dtP and ddP parameters the defrost can be
started when the difference between dPA and dPb probes is lower than dtP for all ddP time. This is
useful to start defrost when a low thermal exchange is detected. If ddP=0 this function is disabled;
Defrost ending
- When defrost is started via rtc, the maximum duration of defrost is obtained from Md parameter and
the defrost end temperature is obtained from dtE parameter (and dtS if two defrost probes are
selected).
- If dPA and dPb are present and d2P=y the instrument stops the defrost procedure when dPA is
higher than dtE temperature and dPb is higher than dtS temperature;
At the end of defrost the drip time is controlled through the “Fdt” parameter.
8.4 FANS
CONTROL WITH RELAY
The fan control mode is selected by means of the “FnC” parameter:
C-n = running with the solenoid valve, OFF during the defrost;
C-y = running with th1e solenoid valve, ON during the defrost;
O-n = continuous mode, OFF during the defrost;
O-y = continuous mode, ON during the defrost;
An additional parameter “FSt” provides the setting of temperature, detected by the evaporator probe,
above which the fans are always OFF. This can be used to make sure circulation of air only if his
temperature is lower than set in “FSt”.
CONTROL WITH ANALOG OUTPUT (if present)
proportional way (excluding the first AMt
seconds where the fans speed is the maximum).
The regulation set point is relative to regulation
set point and is indicated by ASr, the
proportional band is always located above
SET+ASr value and its value is PbA. The fan are
at minimum speed (AMi) when the temperature
read by fan probe is SET+ASr and the fan is at
maximum speed (AMA) when the temperature is
SET+ASr+PbA.
8.5 ANTI SWEAT HEATERS (IF PRESENT)
This control is performed when trA=AC. In this case, there is two way to control the anti-sweat heaters:
• Without real dew-point information: in this case the default value for dew-point is used
(SdP parameter).
• Receiving dew-point from XWEB5000 system: the SdP parameter is overwrote when valid
value for dew-point is received from XWEB.
The P4 probe is used to perform the regulation
and it should be placed on the showcase glass.
In case of P4 error or if P4 is absent the output is
at AMA value for the AMt time then the output is
at 0 value for the time 255-AMt time performing
a simple PWM modulation.
9. PARAMETER LIST
REGULATION
rtC Access to CLOCK submenu (if present);
EEU Access to EEV submenu (only XM669K);
Hy Differential: (0,1÷25,5°C; 1÷45°F): Intervention differential for set point, always positive.
Solenoid valve Cut IN is Set Point Plus Differential (Hy). Solenoid valve Cut OUT is when the
temperature reaches the set point.
Int Integral time for room temperature regulation (Only XM669K): (0 ÷ 255 s) integral time for
room temperature PI regulator. 0= no integral action;
CrE Continuous regulation activation (Only XM669K): (n÷Y) n= standard regulation; Y=
continuous regulation. Use it only in centralized plants;
LS Minimum set point limit: (-55.0°C
÷
÷÷
÷
SET; -67°F÷SET) Sets the minimum acceptable value for
the set point.
US Maximum set point limit: (SET
÷
÷÷
÷
150°C; SET÷302°F) Set the maximum acceptable value for
set point.
OdS Outputs activation delay at start up: (0÷255 min) This function is enabled at the initial start
up of the instrument and inhibits any output activation for the period of time set in the
parameter. (AUX and Light can work)
AC Anti-short cycle delay: (0÷60 min) interval between the solenoid valve stop and the following
restart.
CCt Compressor ON time during continuous cycle: (0.0÷24.0h; resolution 10min) Allows to set
the length of the continuous cycle: compressor stays on without interruption for the CCt time.
Can be used, for instance, when the room is filled with new products.
CCS Set point for continuous cycle: (-55÷150°C / -67÷302°F) it sets the set point used during the
continuous cycle.
Con solenoid valve ON time with faulty probe: (0÷255 min) time during which the solenoid valve
is active in case of faulty thermostat probe. With COn=0 solenoid valve is always OFF.
CoF solenoid valve OFF time with faulty probe: (0÷255 min) time during which the solenoid valve
is off in case of faulty thermostat probe. With COF=0 solenoid valve is always active.
DISPLAY
CF Temperature measurement unit: °C=Celsius; °F=Fahrenheit. !!! WARNING !!! When the
measurement unit is changed the parameters with temperature values have to be checked.
PrU Pressure mode: (rEL or AbS) it defines the mode to use the pressure. !!! WARNING !!! the
setting of PrU is used for all the pressure parameters. If PrU=rEL all pressure parameters are in
relative pressure unit, if PrU=AbS all pressure parameters are in absolute pressure unit. (Only
XM669K)
PMU Pressure measurement unit: (bAr – PSI - MPA) it selects the pressure measurement units.
MPA= the value of pressure measured by kPA*10. (Only XM669K)
PMd Way of displaying pressure : (tEM - PrE) it permits showing the value measured by pressure
probe with tEM= temperature or by PrE= pressure; (Only XM669K)
rES Resolution (for °C): (in = 1°C; dE = 0.1 °C) allows decimal point display;
Lod Instrument display: (nP; P1; P2, P3, P4, P5, P6, tEr, dEF) it selects which probe is displayed
by the instrument. P1, P2, P3, P4, P5, P6, tEr= virtual probe for thermostat, dEF= virtual probe
for defrost.
red Remote display: (nP; P1; P2, P3, P4, P5, P6, tEr, dEF) it selects which probe is displayed by
the X-REP. P1, P2, P3, P4, P5, P6, tEr= virtual probe for thermostat, dEF= virtual probe for
defrost.
dLy Display delay: (0 ÷24.0 m; resolution 10s) when the temperature increases, the display is
updated of 1 °C/1°F after this time.
rPA Regulation probe A: (nP; P1; P2, P3, P4, P5) first probe used to regulate room temperature. If
rPA=nP the regulation is performed with real value of rPb.
rPb Regulation probe B: (nP; P1; P2, P3, P4, P5) second probe used to regulate room
temperature. If rPb=nP the regulation is performed with real value of rPA
rPE Regulation virtual probe percentage: (0 ÷ 100%) it defines the percentage of the rPA respect
to rPb. The value used to regulate room temperature is obtained by:
value_for_room = (rPA*rPE + rPb*(100-rPE))/100
ELECTRONIC EXPANSION VALVE SUBMENU (Only XM669K)
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.
SSH Superheat set point: [0.1°C ÷ 25.5°C] [1°F ÷ 45°F] it’s the value used to regulate superheat
CyP Cycle Period: (1 ÷ 15s) it permits to set cycle time;
Pb Proportional band: (0.1 ÷ 60.0 / 1÷108°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;
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. – On=unlimited) if probe error
duration is bigger than PEd then valve totally closes. Pf message is showed. If PEd=On valve
opening is PEo until probe error finishes;
OPE Start opening Percentage: (0÷100%) Opening valve percentage when start function is active.
This phase duration is SFd time;
SFd Start Function duration: (0.0 ÷ 42.0 min: resolution 10s) It sets start function duration and
post-defrost duration. During this phase the alarms are neglected;
OPd Opening Percentage after defrost phase: (0÷100%) Opening valve percentage when after
defrost function is active. This phase duration is Pdd time;
Pdd Post Defrost Function duration: (0.0 ÷ 42.0 min: resolution 10s) It sets start function duration
and post-defrost duration. During this phase the alarms are neglected;
MnF Maximum opening percentage at normal Functioning: (0÷100%) during regulation it sets
the maximum valve opening percentage;
dCL Delay before stopping valve regulation: (0 ÷ 255s) When the cooling request goes off, the
electronic valve regulation can go on for the dCL time in order to prevent uncontrolled
superheat variation;
Fot Forced opening percentage: (0÷100% - nu) it permits to force the valve opening to the
specified value. This value overwrite the value calculated by PID algorithm. !!!! WARNING !!!!
to obtain the correct superheat regulation you have to set Fot=nu;
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 depending on P5C parameter,
LAn= the pressure signal arrives from another XM600K; Referred to Pb5
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) Referred to Pb5
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) Referred to Pb5
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 MOP alarm.
(related to PrM parameter)
LOP Lowest Operating Pressure threshold: (PA4 ÷ P20 bar / psi / kPA*10) if the suction pressure
comes down to this value a low pressure alarm is signalled with LOP alarm. (related to PrM
parameter)
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.
MSH Maximum Superheat alarm: (LSH ÷ 80.0°C / LSH ÷ 144°F) when superheat exceeds this
value an high superheat alarm is signalled after interval SHd
LSH Lowest Superheat alarm: (0.0 ÷ MSH °C / 0÷MSH °F) when superheat goes down to this
value a low superheat alarm is signalled after interval SHd
SHy Superheat alarm Hysteresis: (0.1÷25.5°C/1÷45°F) hysteresis for superheat alarm
deactivation
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