dixell EMERSON XR30D Installing And Operating Instructions

Digital controller with off cycle defrost
XR30C – XR30D

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

Model XR30C, format 32 x 74 mm, and XR30D, DIN rail format, are digital
thermostats with off cycle defrost designed for refrigeration applications at normal
temperature. They provide two relay outputs, one for the compressor, the other
one can be used for alarm signalling or as auxiliary output. The probe input can be
selected between PTC or NTC. The instrument has a digital input, for alarm
signalling, for switching the auxiliary output or for start a defrost cycle.

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

Defrost is performed through a simple stop of the compressor. Parameter "IdF"
controls the interval between defrost cycles, while its length is controlled by
parameter "MdF".

4. FRONT PANEL COMMANDS

1592007221 XR30C-D GB r1.0 18.11.2015
XR30C
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; hold pressed it switches
the auxiliary output; 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
AUX ON
Second relay ON
ON An temperature alarm happened
5. TEMPERATURE ALARM AND ITS DURATION
RECORDING (HACCP)
XR30C 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
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.
XR30C – XR30D
XR30D
FUNCTION
)
)
X
X
Safe food zone
Set
Alarm duration
X
Time
1/4