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Digital controller with defrost and fans management
XR60C
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__________________________________________________ 3
9.
INSTALLATION AND MOUNTING ___________________________________ 3
10. ELECTRICAL CONNECTIONS______________________________________ 3
11. HOW TO USE THE HOT KEY ______________________________________ 3
12. ALARM SIGNALS ________________________________________________ 4
13. TECHNICAL DATA _______________________________________________ 4
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.
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 XR60C, 32x74 mm format, is a microprocessor based controller, suitable for
applications on medium or low temperature ventilated refrigerating units. It has 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
SET: To display target set point; in programming mode it selects a parameter or
confirm an operation.
(DEF)
To start a manual defrost
9
9
(UP): To see the last temperature alarm happened; in programming mode it
browses the parameter codes or increases the displayed value.
8
8
(DOWN) To see the last temperature alarm happened; in programming mode it
browses the parameter codes or decreases the displayed value.
KEY COMBINATIONS:
9
9
+
8
8
To lock & unlock the keyboard.
SET +
8
8
To enter in programming mode.
SET +
9
9
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
S e t
A Lu
H igh te m p. alarm
Tim e
Tem p era ture
A LL
Low te mp . alarm
;
;
;
A larm duration
M ax
Tem p era tu re
Safe food zone
3
