dIXEL
Installing and Operating Instructions
1598029050
1598029050 XW40L NFR GB r1.0 11.07.2008.doc
XW40L
1/3
Digital controller for medium-low temperature
refrigeration applications
XW40L
1.
GENERAL WARNING
1.1
PLEASE READ BEFORE USING THIS MANUAL
•
This manual is part of the product and should be kept near the instrument for easy and quick reference.
•
The instrument shall not be used for purposes different from those 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 controller only within the operating limits 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 instrument back to the distributor or to “Dixell S.p.A.” (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 in industrial environments, the use of mains filters (our mod. FT1) in parallel with
inductive loads could be useful.
2.
GENERAL DESCRIPTION
Model
XW40L
, format 38x185mm, is microprocessor based controller, suitable for applications on
medium or low temperature ventilated refrigerating units. It has 3 relay outputs to control
compressor, defrost, which can be either electrical or reverse cycle (hot gas) and light . It is also
provided with 2 NTC probe inputs, the first one for temperature control, the second one, to be located
onto the evaporator, to control the defrost termination temperature.
The HOT KEY output allows to connect the unit, by means of the external module XJ485-CX, to a
network line
ModBUS-RTU
compatible such as the
dIXEL
monitoring units of X-WEB family. It
allows to program the controller by means the HOT KEY programming keyboard.
The instrument is fully configurable through special parameters that can be easily programmed
through the keyboard.
3.
CONTROLLING LOADS
3.1
COMPRESSOR
The regulation is performed according
to the temperature measured by the
thermostat probe with a positive
differential from the set point: if the
temperature increases and reaches set
point plus differential the compressor is
started and then turned off when the
temperature reaches the set point value
again.
Time
Temper.
Compr.
SET
ON
In case of fault in the thermostat probe the start and stop of the compressor are timed through
parameters “
COn
” and “
COF
”.
3.2
DEFROST
Two defrost modes are available through the “
tdF
” parameter: defrost through electrical heater (
tdF
= EL
) and hot gas defrost (
tdF = in
). Other parameters are used to control the interval between
defrost cycles (IdF), its maximum length (MdF) and two defrost modes: timed or controlled by the
evaporator’s probe (P2P).
At the end of defrost dripping time is started, its length is set in the FSt parameter. With FSt =0 the
dripping time is disabled.
4.
FRONT PANEL COMMANDS
4.1
STEEL FINISHING
: To display target set point; in programming mode it selects a parameter or confirm an
operation.
(DEF)
To start a manual defrost
(
UP)
: To see the max. stored temperature; in programming mode it browses the parameter
codes or increases the displayed value.
(
DOWN
) To see the min stored temperature; in programming mode it browses the parameter
codes or decreases the displayed value.
To switch the instrument off.
To switch the light.
KEY COMBINATIONS:
+
To lock & unlock the keyboard
.
+
To enter in programming mode.
+
To return to the room temperature display.
4.2
USE OF LEDS
Each LED function is described in the following table.
LED
MODE
FUNCTION
ON Compressor
enabled
Flashing Anti-short cycle delay enabled
ON Defrost
enabled
Flashing Drip time in progress
ON
An alarm is occurring
ON
Continuous cycle is running
ON
Energy saving enabled
ON Light
on
°C/°F
ON Measurement
unit
°C/°F
Flashing Programming
phase
5.
MAX & MIN TEMPERATURE MEMORIZATION
5.1
HOW TO SEE THE MIN TEMPERATURE
1.
Press and release the
n
key.
2.
The “Lo” message will be displayed followed by the minimum temperature recorded.
3.
By pressing the
n
key again or by waiting 5s the normal display will be restored.
5.2
HOW TO SEE THE MAX TEMPERATURE
1.
Press and release the
o
key.
2.
The “Hi” message will be displayed followed by the maximum temperature recorded.
3.
By pressing the
o
key again or by waiting 5s the normal display will be restored.
5.3
HOW TO RESET THE MAX AND MIN TEMPERATURE RECORDED
1.
Hold press the SET key for more than 3s, while the max. or min temperature is displayed. (rSt
message will be displayed)
2.
To confirm the operation the “rSt” message starts blinking and the normal temperature will be
displayed.
6.
MAIN FUNCTIONS
6.1
HOW TO SEE THE SET POINT
1.
Push and immediately release the
SET
key: the display will show the
Set point value;
2.
Push and immediately release the
SET
key or wait for 5 seconds to
display the probe value again.
6.2
HOW TO CHANGE THE SET POINT
1.
Push the
SET
key for more than 2 seconds to change the Set point value;
2.
The value of the set point will be displayed and the “
°C” or “°F”
LED starts blinking;
3.
To change the Set value push the
o
or
n
arrows within 10s.
4.
To memorise the new set point value push the
SET
key again or wait 10s.
6.3
HOW TO START A MANUAL DEFROST
Push the
DEF
key for more than 2 seconds and a manual defrost will start.
6.4
HOW TO CHANGE A PARAMETER VALUE
To change the parameter’s value operate as follows:
1.
Enter the Programming mode by pressing the
Set
+
n
keys for 3s (the “
°C” or “°F”
LED starts
blinking).
2.
Select the required parameter. Press the “
SET
” key to display its value
3.
Use “
UP
” or “
DOWN
” to change its value.
4.
Press “
SET
” to store the new value and move to the following parameter.
To exit
: Press
SET + UP
or wait 15s without pressing a key.
NOTE
: the set value is stored even when the procedure is exited by waiting the time-out to expire.
6.5
THE HIDDEN MENU
The hidden menu Includes all the parameters of the instrument.
6.5.1 HOW TO ENTER THE HIDDEN MENU
1.
Enter the Programming mode by pressing the
Set
+
n
keys for 3s (the “
°C” or “°F”
LED starts
blinking).
2.
Released the keys, then push again the Set+
n
keys for more than 7s. The Pr2 label will be
displayed immediately followed from the HY parameter.
NOW YOU ARE IN THE HIDDEN MENU.
3.
Select the required parameter.
4.
Press the “
SET
” key to display its value
5.
Use
o
or
n
to change its value.
6.
Press “
SET
” to store the new value and move to the following parameter.
To exit
: Press
SET +
o
or wait 15s without pressing a key.
NOTE1:
if none parameter is present in Pr1, after 3s the “noP” message is displayed. Keep the keys
pushed till the Pr2 message is displayed.
NOTE2
: the set value is stored even when the procedure is exited by waiting the time-out to expire.
