dixell XH260L, XH260V Operating Informations
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1. GENERAL WARNING
1.1
PLEASE READ BEFORE USING THIS MANUAL
• This manual is part of the pr oduct and should be kept near the instrument for easy and quick
reference.
• The instrument shall not be used for purposes different from thos e described hereunder . It cannot
be used as a safety device.
• Check the application limits before proceeding.
1.2
SAFETY PRECAUTIONS
• Check the supply voltage is correct before connecting the instrument.
• Do not expose to water or moisture: use the c ontroller only within the operating limit s avoiding
sudden temperature changes with high atmospheric humidity to prevent formation of condensation
• Warning: disconnect all electrical connections before any kind of maintenance.
• Fit the probe where it is not accessible by the End User. The instrument must not be opened.
• In case of failure or faulty operation send the ins trument back to the distr ibutor or to “Dixell s.r.l.”
(see address) with a detailed description of the fault.
• Consider the maximum current which can be applied to each relay (see Technical Data).
• Ensure that the wires for probes, loads and the power supply are separated and far enough from
each other, without crossing or intertwining.
• In case of applications i n i ndustr i al env i r onm ents , the us e of m ai ns fi l t ers ( our m od. F T1) i n parallel
with inductive loads could be useful.
2. GENERAL DESCRIPTION
The
XH260L, 38x185
format, and the
XH260V, 100x64
format, are microproc essor control lers, suit able
for applications on medium or low temperature refrigerating units. They control both humidity and
temperature. They have 6 output relays to control compressor, heating elements, defrost, fan dehumidifier and humidi fier. They have 2 NTC inputs one for thermos tat the other one for defrost. It’ s als o
present and 4÷20mA input for humidity. There is one digital input (free contact) configurable by
parameter. An output allows the user to programme the parameter list with the
“Hot Key”.
3. TEMPERATURE REGULATION
The temperature regulation is performed through neutral zone using compressor and heater output
relays.
Set point
OFF
ON
•
Heating
output: CUT IN is “SET_TEMP-dbt”, CUT OUT is when the temperature reaches the set point.
•
Compressor
output CUT IN is “ SET_TEMP + dbt”, CUT O UT is when the tem per atur e r eac hes the set
point.
3.1 DEFROST
Two defrost modes are avai lable through the “
tdF
” parameter: defrost with electri cal heater or hot gas.
The defrost interval is control by means of parameter “
EdF
”: (EdF=in) the defrost i s made every “
IdF
”
time, (EdF=Sd) the interval “IdF” is calcul ate thr ough S m ar t Defros t al gor i t hm (only when the compressor
is ON).
To
disable
the defrost set the
MdF
parameter to
zero
Humidity regulation during a defrost depends on the
Hud
parameter.
With
Hud=no
humidity regulation is disabled.
Con
Hud=yES
humidity regulation is performed also during a defrost.
4. HUMIDITY REGULATION
The humidity regulation is performed through neutral zone, by humidifying dehumidifying actions.
Humidity control can be dis abled setting the
SET_RH
to “nu” value. In this case only the tem perature
control is perform.
4.1 HUMIDIFYING ACTION
The humidifying action is done enabling the humidifier relay when the humidity is lower than the
“SET_RH-dbH” value.
The relay is switch off when humidity reaches the set values.
4.2 DEHUMIDIFYING ACTION WITHOUT DEHUMIDIFIER RELAY (OA1 DIFFERENT FROM DEH) –
STANDARD CONFIGURATION
In this case the dehumidifying action is performed by setting the following parameters in this way:
tHu = c-H kind of dehumidifying by means of heating and compressor relays
oA1 different from dEH:
The heating and compressor outputs are activ ated together when humidi ty is higher than SE T_RH+dbH
value. Outputs are disabled when humidity comes back to the SET_RH value.
4.2.1 Relation between cooling, heating and dehumidifying
1. If is simultaneousl y present a r equest of cooli ng (temp>S ET_TEM P+dbt) and dehumi difyi ng (RH
> SET_RH+dbH): the cooling acti on has the priority over the dehumidifying acti on: only the
compressor relay is energised till the SET_TEMP is reached at this point also the heating rel ay is
enabled.
2. If is simultaneously present a request of heating (tem p< SET_T EMP- dbt) and dehumidi fying (RH
> SET_RH+dbH): the dehumidi fying action has the priority over the heating action: both the
compressor and the heating rel ays are energi sed t ill the humidity set is reached at this point only
the heating relay is enabled.
4.3 DEHUMIDIFYING ACTION WITH DEHUMIDIFIER RELAY (OA1 = DEH)
The configurable relay is used,
(XH260L terminals 3-4, XH260V t er min als 11-12)
setting the parameter
oA1 =dEH.
NOTE:
the LIGHT button is not more available;
Two kinds of de-humidifying are available:
4.3.1 Dehumidifying action with ONLY de-humidifier relay
By setting the parameter
tHu = db
the de-humidifying ac tion is per formed by enabl ing the de-humidi fier
relay when the humidity is higher than SET_RH + dbH.
The relay is switch off when humidity comes back to the SET_RH value.
4.3.2 Dehumidifying action with de-humidifier and compressor relays
By setting the parameter
tHu = cHu
the de-humidifying ac ti on i s per for m ed by enabl i ng the de- hum i difier
and compressor relays together. when the humidity is higher than SET_RH + dbH.
The relays are switched off when humidity comes back to the SET_RH value.
If is simultaneousl y present a request of cooling (temp>SET_TEMP +dbt) and dehumidifying (RH >
SET_RH+dbH): the cooling action has the priority over the dehumidifying action: onl y the compressor
relay is energised till the SET_TEMP is reached at this point also the de-humidifier is enabled.
5. FA NS
The fan control mode is selected by means of the “
FnC
” parameter:
FnC=C-n
fans will switch ON and OFF with the compressor and
not run
during defrost:;
FnC= O-n
fans will run co ntinuously, but not during defrost
FnC=C-y
fans will switch ON and OFF with the compressor and
run
during defrost;
FnC=O-y
fans will run continuously also during defrost
6. THE DISPLAY
To display and modify target temperature set point. (SET_TEMP)
To display and modify target humidity set point (SET_RH); in programming mode it selects a
parameter or confirm an operation.
In programming mode it browses the parameter codes or increases the displayed value.
To start a manual defrost: hold it pressed for at least 3s.
In programming mode it browses the parameter codes or decreases the displayed value.
Switch ON and OFF the light, if present (oA1=lig)
Switch ON and OFF the instrument.
KEY COMBINATIONS
+
To lock and unlock the keyboard
+
To enter the programming mode.
+
To exit the programming mode.
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6.1 ICONS AND SYMBOLS
Each LED function is described in the following table.
LED2
LED3
LED4
Temperature
Display
Humidity
Display
LED MODE FUNCTION
Led 4
ON - Instrument in stand by.
- In “Pr2” indicates that the parameter is also present in “Pr1”.
ON °C
°F
ON °C
ON The compressor is running
FLASHING - Anti-short cycle delay enabled
LED 3
ON The defrost is enabled
LED 3
FLASHING Drip time in progress
LED 2
FLASHING Programming Phase (flashing with LED3)
ON Heating enabled
(temp)
FLASHING Temperature Set programming phase
ON - ALARM signal
ON Fan is running
ON The light is on
ON RH%
ON Dehumidifying enabled
ON Humidifying enabled
(umid)
FLASHING Humidity Set programming phase
6.2 HOW TO SEE AND MODIFY THE SET POINT (TEMPERATURE AND HUMIDITY)
1. Push and immediatel y release the SET key: the display will show the Set point
valueand the correspondant set icon starts flashing;
2. To change the Set value push the
9
9
or
8
8
arrows within 10s.
3. To memorise the new set point value push the SET key again or wait 10s.
6.3 TO START A MANUAL DEFROST
1. Push the DOWN key for more than 2 seconds and a manual defrost will start.
6.4 TO ENTER IN PARAMETERS LIST “PR1”
To enter the parameter list “Pr1” (user accessible parameters) operate as follows:
+
1. Enter the Programmi ng mode by pressing the SET_RH+
8
8
for few
seconds. (LED2&3 start flashing)
2. The instrument will sho w the first parameter presen t in “Pr1”
6.5 TO ENTER IN PARAMETERS LIST “PR2”
To access parameters in “Pr2”:
1. Enter t he “Pr1” level.
2. Select “Pr2” parameter and press the “ SET_RH ” key.
3. The “PAS” flashing message is displayed, shortly followed by “0 - -” with a flashing zero.
4. Use
9
9
or
8
8
to input the security code in the fl ashing digit; confirm the figure by pres sing “
SET_RH ”.
The security code is “321“.
5. If the security code is correct the acces s to “Pr2” is enabled by pr essing “ SET_RH ” on the last
digit.
Another possibility is the following: after s wi tc hi ng O N the i ns tr um ent the us er c an pus h SET_RH +
8
8
keys within 30 seconds.
NOTE: each parameter in “Pr2” c an be removed or put into “Pr1” (user l ev el) by press i ng SET_RH +
8
8
.
When a parameter is present in “Pr1” LED 4 is on.
6.6 TO CHANGE PARAMETER VALUES
1. Enter the Programming mode.
2. Select the required parameter with
9
9
or
8
8
.
3. Press the “ SET_RH ” key to display its value (LED2&3 start blinking).
4. Use
9
9
or
8
8
to change its value.
5. Press “ SET_RH ” to store the new value and move to the following parameter.
To exit: Press SET_RH + UP or wait 15s without pressing a key.
NOTE: the new programming is stored even when the procedure is exited by waiting the time-out.
6.7 HOW TO LOCK THE KEYBOARD
1.
Keep the
9
9
and
8
8
keys pressed together for more than 3 s the
9
9
and
8
8
keys.
2.
The “POF” message will be displayed and the keyboard is locked. At this poi nt it is
only possible the vi ewing of the set point or the MAX o M in tem perature s tored and
to switch ON and OFF the light, the auxiliary output and the instrument.
TO UNLOCK THE KEYBOARD
Keep the
9
9
and
8
8
keys pressed together for more than 3s.
6.8 ON/OFF FUNCTION
By pushing the ON/OFF key, the ins tr um ent shows “OF F” for 5 s ec . and the ON/OFF LED
is switched ON.
During the OFF status, all the relays are switched OFF and the regulations are stopped;
N.B. During the OFF status the LED4 button is lighted.
7. PARAMETER LIST
REGULATION
dbt half dead band width for temperature: (0,1÷25,5°C; 1÷45°F) this band is pl ac e bel ow and abov e
the temperature set point (SET_TEMP). The compressor is enabled when the temperature
increases and reaches the SET_TEMP + dbt value. It i s turned off when it comes back to the
SET_TEMP. The heating output i s enabled when temperatur e is less than SET_TE MP -dbt value
and disabled when the SET_TEMP is reached.
dbHhalf dead band width for humidity: (0,5÷25,5RH) this band is place below and above the
humidity set point (SET_RH). The dehumidifying action is enabled when the humidity increases and
reaches the SET_RH + dbH value. It is stopped when it comes back to the SET_RH. The
humidifying output is enabl ed when humidi ty is l ess than S ET_RH -dbH val ue and disabl ed when
the SET_RH is reached.
LS Minimum temperature set point limit: (-50,0°C
÷
SET; -58°F ÷SET) S ets the mi nim um acc eptable
value for the set point.
US Maximum temperature set point limit: (SET
÷
110°C; SET÷230° F) S et the maximum acceptable
value for set point.
OdS Output s act ivatio n d elay at st ar t u p: ( 0÷255 min) Thi s func ti on i s enabl ed at the initial start up of
the instrument and inhibits any output acti vation for the peri od of time set in the par ameter. (Light
can work)
AC Anti-short cycle delay: (0÷30 min) interval between the compressor stop and the following restart.
tHu Kind of de-humidifying: db: only with de-humidifier relay (oA1= dEH)
cHu with de-humidifier and compressor relay (oA1= dEH)
c-H: without de-humidifier relay, by means of compressor and heating relays (oA1≠ dEH).
LSH Minimum humidity set point limit: (Lci ÷ Set H) Sets the minimum acceptabl e value for the
humidity set point.
USH Maximum humidity set point limit: (Set H ÷ uci) Set the maximum acceptable value for
humidity set point.
DISPLAY
CF Measurement unit: °C= Celsius; °F= Fahrenheit
rES Resol uti on (for °C): allows decimal point display. dE = 0,1°C; in = 1 °C
rEH Resolution for RH%: in = integer; Hd= half digit.
DEFROST
tdF Defrost type: rE = electrical heater (Compressor OFF)
in = hot gas (Compressor and defrost relays ON)
EdF Defrost mode: in = interval mode. The defrost starts when the time “Idf” is expired.
Sd = Smartfrost mode. The time IdF (interval between defrosts) is increased only when the
compressor is running (even non consecutively).
SdF Set point for SMARTFROST: (-30
÷
30 °C/ -22÷86 °F) evaporator temperature which allows the IdF
counting (interval between defrosts) in SMARTFROST mode.
dtE Defrost termination temperature: (-50,0÷110,0°C; -58÷230°F) (Enabled only when the
evaporator probe is present) sets the temperatur e m easur ed by the ev apor ator pr obe whi c h c aus es
the end of defrost.
IdF Interval between defrosts: (1÷ 120h) Deter mines the time i nterval between the beginning of two
defrost cycles.
MdF Duration of defrost: (0÷255 m i n) W hen P2P = n, no evaporator probe, it sets the defrost dur ati on,
when P2P = y, defrost end based on temperature, it sets the maximum length for defrost.
dFd Display during defrost: rt = real temperature; it = temperature reading at the defrost start;
Set = set point; dEF = “dEF” label; dEG = “dEG” label;
dAd Defrost displa y time out: (0
÷
255 min) Sets the maxim um time between the end of defrost and the
restarting of the real room temperature display.
Fdt Drain down time: (0÷60 m in.) time i nterv al between reac hing defr ost term inati on temperatur e and
the restoring of the control’s normal oper ation. This time al lows the evaporator to el iminate water
drops that might have formed due to defrost.
dPO First defrost after start-up: y = Immediately; n = after the IdF time
Hud Humidity control during defrost: no: the humidity control is stopped dur ing the defrost; yES the
humidity control works also during the defrost.
FANS
FnC Fan operating mode: C-n = running when a load is on, OFF during the defrost;
C-y = running when a load is on, ON during the defrost;
O-n = continuous mode, OFF during the defrost; O-y = continuous mode, ON during the defrost;
TEMPERATURE ALARMS
ALC Temperature alarm configuration: rE = High and Low alarms related to Set Point
Ab = High and low alarms related to the absolute temperature.
ALL Low temperature alarm setting:ALC = rE , 0
÷
50 °C or 90°F
ALC = Ab , - 50°C or -58°F
÷
ALU
when this temperature is reached and after the ALd delay time, the LA alarm is enabled,.
ALU High temperature alarm setting: ALC= rE, 0
÷
50°C or 90°F
ALC= Ab, ALL
÷
110°C or 230°F
when this temperature is reached and after the ALd delay time the HA alarm is enabled.
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