Emerson Dixell XR40D Installing And Operating Instructions

Digital controller with defrost management
XR40C – XR40D
CONTENTS
1. GENERAL WARNING __________________________________________ 1
2. GENERAL DESCRIPTION _______________________________________ 1
3. CONTROLLING LOADS ________________________________________ 1
4. FRONT PANEL COMMANDS ____________________________________ 1
5. TEMPERATURE ALARM AND ITS DURATION RECORDING (HACCP) ___ 1
6. MAIN FUNCTIONS _____________________________________________ 2
7. PARAMETERS ________________________________________________ 2
8. DIGITAL INPUT (IF AVAILABLE) __________________________________ 3
9. INSTALLATION AND MOUNTING _________________________________ 3
10. ELECTRICAL CONNECTIONS ___________________________________ 3
11. HOW TO USE THE HOT KEY ____________________________________ 3
12. ALARM SIGNALS ______________________________________________ 3
13. TECHNICAL DATA _____________________________________________ 3
14. CONNECTIONS _______________________________________________ 4
15. 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.

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 XR40C, format 32 x 74 mm, and XR40D, DIN rail format, are
microprocessor based controllers, suitable for applications on medium or low
temperature refrigerating units. They have 2 relay outputs to control compressor
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. 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.
1592007231 XR40C-D GB r1.0 18.11.2015
4. FRONT PANEL COMMANDS
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
ON Compressor enabled
Flashin
-Programming Phase (flashing with
g
- Anti-short cycle delay enabled
ON Defrost enabled
Flashin
- Programming Phase (flashing with
g
- Drip time in progress
ON An temperature alarm happened
5. TEMPERATURE ALARM AND ITS DURATION
RECORDING (HACCP)
XR40C signals and records temperature alarms, together with their duration and
max value reached. See drawing:
Ex. High temperature alarm
Temperature
Max
Temperature
ALu
High temp. alarm
Set
ALL
Low temp. alarm
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" fot the minimum allarm), followed
by the Maximum (minimum) temperature.
Then the "tiM" (tiMe) 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)
To confirm the operation, the "rSt" message starts blinking and the normal
2.
temperature will be displayed.
XR40C – XR40D
XR40C
XR40D
FUNCTION
)
)
X
X X
Safe food zone
Time
Alarm duration
1/4