1592020680 XRi60CH EN r2.0 2021.07.14
XRi60CH
1/9
XRi60CH
Digital controller for variable speed drive
FW 24.3
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 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 fa
ilure 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
XRi60CH
, format 32x74mm, is microprocessor-based controller, suitable for applications on
medium or low temperature ventilated refrigerating units with variable speed compressors. It has four
relay outputs to control compressor, fan, defrost, which can be either electrical or reverse cycle (hot
gas) and light (configurable). It could be provided with a Real Time Clock which allows programming
of up to 6 daily defrost cycles, divided into holidays and workdays, or selecting weekly energy saving
intervals. It is also provided with up to four NTC, PTC or PT1000 probe inputs and a frequency output
signal to drive variable speed compressors.
The HOTKEY I/O port allows connecting the unit, by means of the external module XJ485-CX, to a
network line
ModBUS-RTU
compatible such as
an
X-WEB monitoring system. With the HOTKEY port
it is possible to modify the configuration of the controller (by using the Wizmate Software).
The instrument is fully configurable, and it can be easily programmed through an external keyboard.
3.
CONTROLLING LOADS
3.1
COMPRESSOR
The regulation is performed according to
the temperature measured by the
thermostat probe with a positive
differential (
HY
) over the set point: if the
temperature increases and reaches set
point plus differential, the compressor
will start. It will turn off as soon as 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
).
The defrost interval depends on the presence of the RTC (optional). The internal RTC is controlled by
means of the
EdF
parameter:
-
EdF=in:
the defrost is made every
idF
time
–
standard way for controller without RTC.
-
EdF=rtC:
the defrost is real time controlled, depending on the hours set in the parameters
Ld1...Ld6
(for workdays).
Other parameters are used to control defrosting cycles: the maximum length (
MdF
) and defrosting
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
Fdt
parameter. With
Fdt=0
the
dripping time is disabled.
3.2.1
PRE-DEFROST
The par.
dAF
enable a pre-defrost phase. During this interval the regulation setpoint will be moved to
the value SET-1°C (or SET-1°F). The defrost phase starts as soon as the regulation temperature reach
the pre-defrost setpoint or when the
dAF
timer ends. This function is disable when
dAF=0
.
3.2.2
HOT GAS DEFROST
If
tdF=in
, the defrost phase will act as follow:
-
If
dSd>0
, the compressor output will be deactivated
-
At the end of
dSd
interval, the defrost output will be activated and timer
StC
will start
-
At the end of
StC
interval, the compressor output will be reactivated.
If
dSd=0
or
StC=0
, the relative functions will be disabled.
3.3
RELAY CONFIGURATION
The functioning of the configurable relays (terminals 1-2, 1-3 and 1-7-8) can be set by the
oA1, oA2
and
oA3
parameters, according to the kind of application. In the following paragraph the possible
setting:
3.3.1
LIGHT RELAY
With
oAx=LiG
the relative relay operates as light output.
3.3.2
AUXILIARY RELAY
Relay activation by digital input 1 or digital input 2 (
oAx=AUS
,
i1F=AUS
): with
oAx=AUS
and
i1F=AUS
the AUX relay is switched on and off by digital inputs.
3.3.3
ON/OFF RELAY (OAX = ONF)
When
oAx=onF
, the relative relay is activated when the controller is turned on and de-activated when
the controller is turned off.
3.3.4
NEUTRAL ZONE REGULATION
With
oAx=db
the relative relay can control a heater element to perform a neutral zone action.
-
oAx
cut in =
SET-HY
-
oAx
cut out =
SET
3.3.5
ALARM RELAY
With
oAx=Alr
the relative relay operates as alarm relay. It is activated every time an alarm happens.
Its status depends on the
tbA
parameter: if
tbA=Y
, the relay is silenced by pressing any key.
If
tbA=n
, the alarm relay stays on until the alarm condition recovers.
3.3.6
SECOND COMPRESSOR
oAx=CP2
is not supported in this model.
3.3.7
SECOND DEFROST OUTPUT
oAx=dF2
is not supported in this model.
3.3.8
NIGHT BLINDS MANAGEMENT DURING ENERGY SAVING CYCLES
With
oAx=HES,
the relative relay operates to manage the night blind: the relay is energised when the
energy saving cycle is activated by digital input or frontal button.
3.3.9
HEATER FOR WATER DRIPPING
If
oAx=HEt
, the relative output will work as heater for water dripping during and after any defrost.
3.3.10
REGULATION OUTPUT
If
oAx=inV
, the relative output will work as regulation output and will stay active as soon as the
regulation request is running.
4.
EVAPORATOR FAN CONTROL
The evaporator 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
The par.
FAP
is used to select which temperature probe will be used from the evaporator fan regulator.
A specific setpoint (par.
FSt
) provides the temperature value, 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-HYF
.
4.1
FORCED ACTIVATION FOR 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.
If the difference between the evaporator temperature and the room temperature is higher than the
FCt
value, the controller will activate the fans. This function is disabled if
FCt=0
.
4.2
CYCLIC ACTIVATION OF THE FANS WHEN THE COMPRESSOR IS
SWITCHED OFF
When
FnC=C-n
or
C-Y
(fans in parallel to the compressor), the fans will be able to carry out on and
off cycles even if the compressor is switched off. The on and off interval of time follow the
Fon
and
FoF
parameters. When the compressor is stopped, the fans will go on working for the
Fon
time. On
the other side, with
Fon=0
the fans will stay always off when the compressor is off.
5.
CONDENSER FAN CONTROL
The condenser fan control mode is selected by means of the
FCC
parameter:
-
FCC = C_n:
fans will switch ON and OFF with the compressor and
not run
during defrost
