1592007251 XR60C-D GB r1.0 08.04.2015
XR60C – XR60D
1/4
Digital controller with defrost and fans management
XR60C
– XR60D
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.
Dixell Srl reserves the right to change the composition of its products, even without notice,
ensuring the same and unchanged functionality.
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.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 in industrial environments, the use of mains filters (our mod. FT1) in
parallel with inductive loads could be useful.
2.
GENERAL DESCRIPTION
Models
XR60C
, format 32 x 74 mm, and
XR60D
, DIN rail format, are microprocessor based
controller, suitable for applications on medium or low temperature ventilated refrigerating
units. They have three relay outputs to control compressor, fan, and defrost, which can be
either electrical or reverse cycle (hot gas). It is also provided with two NTC or PTC probe
inputs, one for temperature control, the other, to be located onto the evaporator, to control the
defrost termination temperature and to managed the fan. 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.
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.
3.3
CONTROL OF EVAPORATOR FANS
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 even if the compressor is off, and not run during defrost;
After defrost, there is a timed fan delay allowing for drip time, set by means of the “
Fnd
”
parameter.
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
An additional parameter “
FSt
” provides the setting of temperature, detected by the evaporator
probe, above which the fans are always OFF. This is used to make sure circulation of air only
if his temperature is lower than set in “FSt”.
3.3.1 Forced activation of fans
This function managed by the
Fct
parameter is designed to avoid short cycles of fans, that
could happen when the controller is switched on or after a defrost, when the room air warms
the evaporator.
Functioning:
if the difference of temperature between the evaporator and the
room probes is more than the value of the Fct parameter, the fans are switched on. With
Fct=0 the function is disabled.
4.
FRONT PANEL COMMANDS
XR60C XR60D
SET
: To display target set point; in programming mode it selects a parameter or confirm an
operation.
(DEF)
To start a manual defrost
o
(
UP)
: To see the last temperature alarm happened; in programming mode it browses the
parameter codes or increases the displayed value.
n
(
DOWN
) To see the last temperature alarm happened; in programming mode it browses
the parameter codes or decreases the displayed value.
KEY COMBINATIONS:
o
+
n
To lock & unlock the keyboard
.
SET +
n
To enter in programming mode.
SET +
o
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
-Programming Phase (flashing with
)
- Anti-short cycle delay enabled
ON
Defrost enabled
Flashing
- Programming Phase (flashing with
)
- Drip time in progress
ON
Fans enabled
Flashing
Fans delay after defrost in progress.
ON
An temperature alarm happened
5.
TEMPERATURE ALARM AND ITS DURATION RECORDING (HACCP)
XR60C signals and records temperature alarms, together with their duration and max value
reached. See drawing:
Ex. High temperature alarm
Set
ALu
High temp. alarm
Time
Temperature
ALL
Low temp. alarm
X
X
X
Alarm duration
Max
Temperature
Safe food zone
5.1
HOW TO SEE THE ALARM DURATION AND MAX (MIN) TEMPERATURE
If the alarm LED is on, an alarm has taken place. To see the kind of alarm, the max (min)
reached temperature and alarm duration do as follows:
1.
Push the Up or Down key.
2.
On the display the following message is shown: “
HAL
” for high temperature alarm
(“
LAL
” for the minimum allarm), followed by the
Maximum (minimum) temperature,
then the “
tiM
” (
tiM
e) message is displayed, followed by the
“Duration”
in h.mm.
3.
Then the instrument displays the temperature once again.
NOTE1:
if an alarm is still occurring the “
tim
” shows the partial duration.
NOTE2:
the alarm is recorded when the temperature come back to normal values
5.2
HOW TO RESET A RECORDED ALARM OR ONE THAT IS STILL
OCCURRING
1.
Hold the SET key pressed for more than 3s, while the recorded alarm is displayed. (the
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.
