dIXEL
Installing and Operating Instructions
1592020050
1592020050 XR50CX GB m&M r1.0 12.03.2007.doc
XR50CX
1/4
Digital controller with defrost management
XR50CX
CONTENTS
1.
GENERAL WARNING ________________________________________________________ 1
2.
GENERAL DESCRIPTION ____________________________________________________ 1
3.
CONTROLLING LOADS ______________________________________________________ 1
4.
FRONT PANEL COMMANDS __________________________________________________ 1
5.
MAX & MIN TEMPERATURE MEMORIZATION____________________________________ 1
6.
MAIN FUNCTIONS __________________________________________________________ 1
7.
PARAMETERS _____________________________________________________________ 2
8.
DIGITAL INPUT
(ENABLED WITH P3P = N)
______________________________________ 3
9.
TTL SERIAL LINE – FOR MONITORING SYSTEMS ________________________________ 3
10.
X-REP OUTPUT – OPTIONAL _________________________________________________ 3
11.
INSTALLATION AND MOUNTING ______________________________________________ 3
12.
ELECTRICAL CONNECTIONS _________________________________________________ 3
13.
HOW TO USE THE HOT KEY__________________________________________________ 3
14.
ALARM SIGNALS ___________________________________________________________ 3
15.
TECHNICAL DATA __________________________________________________________ 3
16.
CONNECTIONS_____________________________________________________________ 4
17.
DEFAULT SETTING VALUES__________________________________________________ 4
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
XR50CX
, format 32 x 74 mm, is microprocessor based controller, suitable for applications on
medium or low temperature refrigerating units. It has 3 relay outputs to control compressor and
defrost, which can be either electrical or reverse cycle (hot gas) and the other one can be used as
light, for alarm signalling or as auxiliary output. It is also provided with three NTC or PTC probe
inputs, the first one for temperature control, the second one, to be located onto the evaporator, to
control the defrost termination temperature, the third one, optional, to connect to the HOT KEY
terminals to signal the condenser temperature alarm or to display a temperature. The digital input
can operate as fourth temperature probe.
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
: 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, if onF = oFF.
Not
enabled.
KEY COMBINATIONS:
+
To lock & unlock the keyboard
.
+
To enter in programming mode.
+
To return to the room temperature display.
4.1
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 enbled
°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 SETPOINT
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 SETPOINT
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:
