Emerson DIXELL XRi20CH Installing And Operating Instructions

XRi20CH
Digital controller for variable speed drive
1. GENERAL WARNING ............................................................................................................... 1
2. GENERAL DESCRIPTION ........................................................................................................ 1
3. CONTROLLING LOADS ........................................................................................................... 1
4. EVAPORATOR FAN CONTROL ............................................................................................... 1
5. CONDENSER FAN CONTROL ................................................................................................. 1
6. DUAL MAP FEATURE .............................................................................................................. 2
7. VARIABLE SPEED COMPRESSOR CONTROL ....................................................................... 2
8. FRONT PANEL AND COMMANDS .......................................................................................... 2
9. MAX & MIN TEMPERATURE MEMORIZATION ....................................................................... 2
10. MAIN FUNCTIONS ................................................................................................................... 2
11. PARAMETERS ......................................................................................................................... 3
12. DIGITAL INPUTS ...................................................................................................................... 5
13. SERVICE SERIAL PORT .......................................................................................................... 5
14. INSTALLATION AND MOUNTING ............................................................................................ 5
15. ELECTRICAL CONNECTIONS ................................................................................................. 5
16. HOW TO USE THE HOT KEY .................................................................................................. 5
17. ALARM SIGNALING ................................................................................................................. 5
18. WIRING DIAGRAM ................................................................................................................... 6
19. DEFAULT SETTING VALUES .................................................................................................. 6
20. TECHNICAL DATA ................................................................................................................... 8
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 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 XRi20CH, format 32x74mm, is microprocessor-based controller, suitable for applications on
medium or low temperature ventilated refrigerating units with variable speed compressors. It has one
relay output to control compressor, fan, defrost, which can be either electrical or reverse cycle (hot
gas) and light (configurable). It is also provided with up to 2 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).
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.
1592029740 XRi20CH EN r2.0 2021.07.14
FW 24.3
.
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 (PAR. oA2)
The functioning of the configurable relay can be set by the oA2 parameter, according to the kind of
application. In the following paragraph the possible setting:
3.3.1 LIGHT RELAY
With oA2=LiG the relative relay operates as light output.
3.3.2 AUXILIARY RELAY
Not supported in this model.
3.3.3 ON/OFF RELAY
When oA2=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
oA2=db is not supported in this model
3.3.5 ALARM RELAY
With oA2=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
oA2=CP2 is not supported in this model.
3.3.7 SECOND DEFROST OUTPUT
oA2=dF2 is not supported in this model.
3.3.8 NIGHT BLINDS MANAGEMENT DURING ENERGY SAVING CYCLES
With oA2=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 oA2=HEt, the relative output will work as heater for water dripping during and after any defrost.
3.3.10 REGULATION OUTPUT
If oA2=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
-
FCC = o_n: fans will run even if the compressor is off, and not run during defrost
-
FCC = C_Y: fans will switch ON and OFF with the compressor and run during defrost
-
FCC = o_Y: fans will run continuously also during defrost
-
The par. FAC is used to select which temperature probe will be used from the condenser fan regulator.
This regulator uses a specific setpoint (par. St2) and differential (par. HY2) to activate and deactivate
the condenser fans:
If T>St2+HY2 the condenser fans are activated
-
If T<St2 the condenser fans are deactivated
-
XRi20CH
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