plug-in, electronic digital thermostat with defrost control
User manual
We wish to save you time and money!
We can assure you that a thorough reading of this manual will guarantee
correct installation and safe use of the product described.
IMPORTANT
BEFORE INSTALLING OR OPERATING ON THE DEVICE, CAREFULLY READ THE INSTRUCTIONS IN THIS
MANUAL.
This instrument has been designed to operate without risks only if:
• Installation, operation and maintenance are performed according to the instructions of this manual;
• Environmental conditions and supply voltage fall within the values indicated here below;
Any different use or changes which have not been previously authorised by the manufacturer, are considered improper.
Responsibility for injures or damage caused by improper use will fall exclusively on the user.
Warning: voltage is present in some electrical components of this instrument, thus all the service or maintenance
operations must be performed by expert and skilled personnel only, aware of the necessary precautions to be taken.
Before accessing the internal parts, disconnect the power supply.
Disposal of the instrument:
The controller is made up of metal and plastic parts. All these components must be disposed of according to the
standards in force in your own country.
CONTENTS
INTRODUCTION ……………………………………………………………………………………………………………30
GENERAL CHARACTERISTICS ................................................................................................................................4
1.
1.1
Models available ................................................................................................................................................................................4
1.1.1
PJ32S .............................................................................................................................................................................................4
1.1.2
PJ32Y - PJ32X...............................................................................................................................................................................4
1.1.3
PJ32C.............................................................................................................................................................................................4
1.2
Characteristics ....................................................................................................................................................................................5
2.
HARDWARE STRUCTURE ..........................................................................................................................................6
2.1
Meaning of the inputs and outputs .....................................................................................................................................................6
2.2
Instrument and accessory codes .........................................................................................................................................................7
2.2.1
Codes for the instruments in individual packaging ........................................................................................................................7
2.2.2
NTC and PTC probes.....................................................................................................................................................................8
2.2.3
Accessories ....................................................................................................................................................................................8
2.3
User interface, meaning of operating indicators and LED display .....................................................................................................9
2.3.1
Using the keypad ...........................................................................................................................................................................9
3.
INSTALLATION ...........................................................................................................................................................10
3.1
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.3
3.4
4.
PARAMETERS - DESCRIPTION ...............................................................................................................................16
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
5.
The configuration parameters...........................................................................................................................................................16
Classification of the parameters .......................................................................................................................................................16
The password PS ..............................................................................................................................................................................16
/ = temperature probe management parameters................................................................................................................................16
r = temperature control parameters...................................................................................................................................................17
c = compressor management parameters..........................................................................................................................................18
d = defrost management parameters.................................................................................................................................................20
A = alarm management parameters ..................................................................................................................................................22
F = evaporator fan management parameters.....................................................................................................................................25
H = other settings .............................................................................................................................................................................27
OPERATING STATES..................................................................................................................................................28
6.
PARAMETERS - MODIFICATION ...........................................................................................................................29
6.1
6.2
6.3
6.4
6.5
6.6
7.
Mechanical installation ....................................................................................................................................................................10
Electrical connections ......................................................................................................................................................................10
Power supply................................................................................................................................................................................10
Special warnings ..........................................................................................................................................................................11
General warnings – installation and connection environments ....................................................................................................11
Electrical connections, PJ32 ........................................................................................................................................................13
Setting the main operating parameters .............................................................................................................................................14
Table summarising the parameters to be checked before installation ..............................................................................................15
Modifying the set point and differential ...........................................................................................................................................29
Accessing the parameters .................................................................................................................................................................29
Modifying the parameters ................................................................................................................................................................30
Saving the new values assigned to the parameters and exiting ........................................................................................................30
Exiting the procedure without modifying the parameters ................................................................................................................30
Parameters – summary table.............................................................................................................................................................30
ALARMS, TROUBLESHOOTING .............................................................................................................................32
7.1
7.2
7.3
7.3.1
7.4
Anomalous or special operating conditions......................................................................................................................................32
Description of the main signals and alarms......................................................................................................................................32
Data error .........................................................................................................................................................................................33
Loading the default parameters....................................................................................................................................................33
Troubleshooting ...............................................................................................................................................................................34
8.
AVAILABLE ACCESSORIES .....................................................................................................................................35
8.1
Key for copying the parameters .......................................................................................................................................................35
8.2
Serial adapter for RS485 network ....................................................................................................................................................36
8.2.1
General characteristics .................................................................................................................................................................36
8.2.2
Installation ...................................................................................................................................................................................37
8.2.3
Setting the operating parameters..................................................................................................................................................37
8.2.4
Serial adapter parameters .............................................................................................................................................................37
8.3
Additional HACCP module..............................................................................................................................................................39
8.3.1
General characteristics .................................................................................................................................................................39
8.3.2
Installation ...................................................................................................................................................................................39
8.3.3
Setting the main operating parameters .........................................................................................................................................39
8.3.4
Parameters - description...............................................................................................................................................................40
8.3.5
Parameters of the plug-in instrument ...........................................................................................................................................40
8.3.6
HACCP module parameters.........................................................................................................................................................40
8.3.7
Parameters corresponding to the recording of the HA and HF alarms.........................................................................................42
8.3.8
Operating mode and alarm signals...............................................................................................................................................42
8.3.9
Cancelling the alarms...................................................................................................................................................................43
9.
TECHNICAL SPECIFICATIONS ...............................................................................................................................44
9.1
9.2
10.
Table summarising the characteristics of the relays used.................................................................................................................45
Temperature/resistance values for the NTC thermistors ..................................................................................................................45
DIMENSIONS ................................................................................................................................................................46
plug-in
INTRODUCTION
The new plug-in family for refrigeration is made up of a new series of microprocessor-based electronic controls with LED
display, designed for the management of display case and showcase refrigeration units.
A range of models is available, providing the best solution for all applications, at the most competitive price.
The plug-in family builds on the experience and success of the previous product ranges, such as the IR32 and IR32E, with the
aim of offering an increasingly simple and economical product, without relinquishing on the performance required by the
refrigeration manufacturer.
The structure of the parameters and the operating logic has remained from the IR32E range, a number of functions have been
simplified, and extra performance has been added. The main characteristics are:
• external RS485 serial interface, optionally connected to the instrument;
• display in degrees (centigrade or Fahrenheit), using display with two digits and minus sign;
• complete range with models featuring 1, 2, 3 relays;
• ergonomic three-button keypad.
Furthermore, new functions and characteristics have been introduced:
• probe inputs for NTC or PTC (different codes);
• display of operating status (cooling - defrost - alarm), using a clearly visible and easily recognisable signal, thanks to the
three buttons with back-lighting;
• highly-efficient red LED display;
• innovative system for fastening the instrument from the front panel, using two screws;
• front frames in various colours, customised upon request;
• external options available, such as: HACCP module and optically-isolated RS485 serial module;
• quick programming of the control, using hardware key, even when the instrument is not powered;
• possibility to modify the list of parameters, selecting each parameter as a frequently-used or password-protected parameter;
• electrical connections using removable (screw or crimped) or fixed screw connectors;
• power thermostat version with 12A resistive relay;
• complete range with power transformer for the 115 to 230Vac versions.
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1. GENERAL CHARACTERISTICS
1.1 Models available
The various models are differentiated according to the following functions and performance:
• operating mode and number of inputs and outputs for versions S, Y, X and C;
• complete versions (hereafter: Top) with serial connection, fastening from front panel, removable terminals;
• compact versions (hereafter: Eco) with fixed terminals and fastening only using rear bracket, and without serial connection;
• the power supply can be one of the following: 230Vac, 115Vac or 12Vac/Vdc;
• the field of measurement for all models is from –50T90 °C (-50T127 °F), with resistive NTC probe;
• a PTC probe is available with the same field of measurement, for one model only (PJ32S Eco);
• digital input from free contact: in models where featured it is an alternative to the second probe;
• relay outputs: available with three different current ratings, 5A, 8A and 12A (for resistive load);
1.1.1 PJ32S
This represents the ideal solution for the management of static refrigeration units (that is, without fan on the evaporator),
operating at normal temperature (above 0ºC). This instrument, in fact, performs the functions of thermometer, displaying the
temperature of the unit, and electronic thermostat, activating the compressor (or the electrovalve in the case of multiplexed
units) so as to maintain the required temperature. Furthermore, it handles automatic defrost using the forced shut-down of the
compressor, and safety functions through management of the time settings.
• All the S models use just one probe for the control functions (AMB. T.), and feature a changeover relay contact for the
control of the actuator (COMPRESSOR).
• In some models (PJ32S00 or S0P) a second probe can be connected to display the product storage temperature; this probe
does not affect control.
• There is a model (PJ32S20) with a digital input and two relay outputs: actuator control and output alarm with changeover
contact.
• The models (PJ32S0P and S1P) use a 12A resistive relay with changeover contact. In all the other models the relay is 8A
resistive;
• There are a significant number of versions, both Top and Eco, with 230V, 115V and also 12V power supply.
1.1.2 PJ32Y - PJ32X
These are designed for the management of static units operating at low temperature (that is, below 0ºC), which require 'active'
defrost using electrical heating elements or the injection of hot gas. The PJ32Y or X, in fact, as well as working as a
thermometer and a thermostat like the S model, also manages the defrost actuator. The frequency and duration of the defrost can
be set. The end defrost can occur according to the temperature reached (connecting a probe to the evaporator) or by time.
• The Y models feature two probe inputs, for control (AMB. T.) and for defrost (DEF. T.).
• The X models, on the other hand, feature just one probe and a digital input; for these models, timed defrost is compulsory.
• There are two relay outputs for the control of the actuator (COMPRESSOR) and for DEFROST control, with changeover
contacts, the relays used are 8A resistive.
• Almost all models feature removable terminals (Top), with 230 or 115V power supply. There is just one Y model (Eco)
with 12V power supply.
1.1.3 PJ32C
These represent the most complete solution for ventilated units operating at low temperature. In these models, there are three
relays, providing complete control of the compressor, fan and defrost management functions. The three 8, 5 and 5A resistive
relays have been built into a very compact case in the versions which also feature the 230V or 115V power transformer, and
without compromising the performance or the reliability of the product.
• There are two probe inputs for control (AMB. T.) and for defrost (DEF. T.).
• There are three outputs: the 8A resistive compressor relay, defrost, and 5A resistive for the fans.
• All versions have removable terminals (Top) and 115Vac and 230Vac power supply.
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1.2 Characteristics
Power supply
The plug-in can be powered at: 230Vac or 115Vac using an internal transformer, or at 12Vac/Vdc without internal transformer.
Aesthetics and ergonomics
The LED signals are clearly visible by the backlighting of the three buttons or 3 symbols on the display.The front panel frame
can be customised both in terms of colour and indications.
LED display
The temperature and the parameter settings are displayed by 'two and a half digits'. For the temperature values, the field of display is
from –50T127 degrees centigrade or Fahrenheit. For the parameters, the field of display can be from -99 to +199, or from -127 to
+127. The 3 status signals represent the activation of an actuator (normally a compressor), the defrost function or an alarm.
Alarm buzzer
The controls with one relay only can be fitted as standard with a buzzer for signalling alarms.
Duty setting and continuous cycle
Functions are:
• the activation of the compressor with programmable timers in the event of control probe fault.
• continuous cycle, which forces the activation of the compressor for the programmable time.
Multifunction input
The digital input, when present, can be used to enable/disable/end the defrost, and to manage serious alarms which require the
immediate (e.g. high pressure) or delayed (e.g. low pressure) shut-down of the unit.
Connections
The economical versions (Eco) maintain the traditional fixed terminals, while the complete versions (Top) use removable
terminals. The latter significantly simplify the installation and maintenance of the machine.
Relay outputs
There are, according to the model, up to three relays for the control of compressors, defrost, fan and alarms. When more than
one relay is fitted, the common of all the relays is connected and is available on just one terminal.
Multifunction output
The alarm relay output, when present, can be set using a parameter to be normally activated or normally deactivated.
Keypad and parameter protection
The keypad can be disabled to avoid tampering by unauthorised persons. For each parameter, furthermore, the level of possible
modification, with or without PASSWORD, can be set.
Serial connection
The Top versions feature serial connection, with the following external options:
• parameter copy key: allows the parameters to be duplicated and configured;
• HACCP module, used to record temperatures and alarms;
• RS485 serial adapter module, for connection to a supervisor.
Display of second probe
In the models with two probes, the measurement of the second probe can be displayed instead of the first (control probe). This
function can be used to display the product storage temperature; the defrost mode, in this case, is only by time.
Fastening
The fastening method used for the economical models (Eco) uses a rear-panel fastening bracket, while all the other versions
(Top) also feature the possibility of fastening from the front panel, using two screws.
Electromagnetic compatibility
The plug-in series conforms to EU standards on electromagnetic compatibility:
• for appliances for domestic use EN55014-2 and EN55014-1;
• for residential, commercial and light industrial environments EN50082-1 and EN50081-1
• for industrial environments EN50082-2 and EN50082-1.
• Regarding safety, it conforms to standards EN60730-1 and EN60730-2-9.
The CE mark confirms the quality and the safety of the plug-in series, guaranteed by the CAREL ISO 9001 certified
design and production system.
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2. HARDWARE STRUCTURE
The instruments in the PJ32* series are temperature controls used to manage refrigeration units (showcases and display cases).
An application diagram is shown in the
figure; also indicated are the possible
accessories and expansion modules, as
well as the connections for the inputs
and outputs:
1. instrument;
2. plug-in frame;
Power
3. temperature probes;
230Vac
4. power transformer (according to
the models);
5. RS485 serial adapter module;
6. HACCP module;
7. parameter programming key.
This manual describes the
characteristics of the instrument, and
only briefly mentions the accessories
and expansion modules.
The connection of the RS485 or
HACCP expansion modules is mutually
exclusive.
Power
230Vac
Power
230Vac
115Vac
Fig. 2.1
2.1 Meaning of the inputs
and outputs
POWER
SUPPLY
temperature
probes
digital input
relay outputs
serial
connection
description (numbering of terminals, with reference to Fig. 2.1)
terminals 8 and 9; the value of the power supply can be 230Vac, 115Vac or 12Vac/Vdc. The effective value
is indicated on the connection label
terminals 5 and 6 are for the ambient temperature probe (control)
terminals 6 and 7 are for the defrost temperature probe (defrost), when featured
according to the code, connection is for standard CAREL NTC or PTC probes
terminals 6 and 7 are for the digital input from free contact, when featured
the group of terminals numbered 1, 2, 3, 4 are for the connection of the relay outputs.
The assignment of the outputs can change according to the code , the effective assignment is indicated on the
connection label.
- For instrument codes with one relay only, the changeover contact is available for compressor control, using
terminals 1, 2, 3.
- For instrument codes with two relays, the changeover contact is available for defrost control, on terminals 1,
2, 3, and the closing contact for the compressor relay, on terminals 3 and 4. Terminal 3 is common for the
two relays, thus the current at the terminal will be the sum of the two.
- For instrument codes with three relays, terminal 1 is used for the compressor control, terminal 3 for fan
control, terminal 4 for defrost control and terminal 2 is the common of all three relays. The current at terminal
two will be the sum of the three outputs.
the four-pin connector is for connection to the RS485 serial and HACCP adapters, and for connection of the
parameter copy key. This connection is not present on the Eco models
Tab. 2.1.1
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2.2 Instrument and accessory codes
The definition of the instrument codes is based on two categories: one for the simpler and more economical versions (Eco), and
one for the versions complete with all functions (Top). The main differences between the two versions are that the following are
present only in the Top versions:
• removable terminals in the place of fixed terminals;
• fastening from front panel using screws;
• serial connector present, with the possibility to connect expansion modules and to the key.
Warning: the options indicated are not all freely modular, and so to avoid incompatibility, product codes have been defined
which cover the needs of the market. Customised versions can only be produced if they are compatible with the internal limits
of the instruments and according to adequate quantities and the kit requirements.
The front panel frame is supplied in grey (standard for the single instrument), it can be customised in terms of colour and text,
and can thus be ordered separately or in a kit.
2.2.1 Codes for the instruments in individual packaging
Eco models with 1 relay: 1 probe, fixed terminals
PJ32S 12Vac/Vdc - NTC -no options- screw terminals relay 8A SPDT
PJ32S 230Vac - NTC -no options- screw term. relay 8A SPDT
PJ32S 110Vac - NTC -no options- screw term. relay 8A SPDT
PJ32S 230Vac - PTC -no options- screw term. relay 8A SPDT
code
PJ32S0EL00
PJ32S0E000
PJ32S0E100
PJ32S6E000
Tab. 2.2.1
Top models with 1 relay: 1 or 2 probes, removable terminals, serial connection
PJ32S 230Vac - 1(2)NTC - removable terminals relay 8A SPDT (*)
PJ32S 110Vac - 1(2)NTC - removable terminals relay 8A SPDT (*)
PJ32S 230Vac - 2 NTC - removable terminals-16A SPDT - buzzer (*)
PJ32S 230Vac - 1 NTC - removable terminals-16A SPDT – dig. input - buzzer
PJ32S 110Vac - 2 NTC - removable terminals-16A SPDT - buzzer (*)
PJ32S 110Vac - 1 NTC - removable terminals-16A SPDT – dig. input - buzzer
code
PJ32S00000
PJ32S00100
PJ32S0P000
PJ32S1P000
PJ32S0P100
PJ32S1P100
Tab. 2.2.2
(*) the S models with two probes, PJ32S00* and PJ32S0P*, have been designed only to use the second probe for the measurement
and display of the food storage temperature (Food Probe). To manage the second probe these models are in reality programmed as Y
models, with all the corresponding parameters, yet without the defrost relay; it is clear that they must be set so as not to use the defrost
function or, if necessary, timed defrost only (d0=2 for timed defrost, dI=0 for no defrost or dI>0 for cyclical defrost).
Top models with 1 relay + 1 alarm relay, 1 probe, dig. input, serial connection
PJ32S 230Vac - NTC - removable terminals - comp. relay(8A NO) + alarm (8A SPDT) (**)
PJ32S 110Vac - NTC - removable terminals - comp. relay(8A NO) + alarm (8A SPDT) (**)
CODE
PJ32S20000
PJ32S20100
Tab. 2.2.3
(**) the S models with alarm relay, PJ32S20*, to use the function for programming the status of the alarm relay using parameter
H1, are programmed as X models; as they do not have the defrost relay, they must be programmed so as not to use the defrost
function or, if necessary, timed defrost only (see (*) Tab. 2.2.2).
Eco models with 2 relays: 2 probes, 2 8A relays, fixed terminals
PJ32Y 12Vac/Vdc - 2 NTC - comp. relay (NO) + defrost (SPDT)
code
PJ32Y0EL00
Tab. 2.2.4
Top models with 2 relays: 1 / 2 probes, 2 8A relays, removable terminals, serial conn.
PJ32Y 230Vac – 2 NTC probes - comp. relay (NO) + defrost (SPDT)
PJ32X 230Vac - 1 NTC probe - 1 digital input - comp. relay (NO) + defrost (SPDT)
PJ32Y 110Vac - 2 NTC probes - comp. relay (NO) + defrost (SPDT)
PJ32X 110Vac - 1 NTC probe - 1 digital input - comp. relay (NO) + defrost (SPDT)
code
PJ32Y00000
PJ32X10000
PJ32Y00100
PJ32X10100
Tab. 2.2.5
Top model with 3 relays: 2 probes, removable terminals, serial connection
PJ32C 230Vac - 2 NTC - comp. relay (8A NO) + defrost (5A NO) + fan (5A NO)
PJ32C 110Vac - 2 NTC - comp. relay (8A NO) + defrost (5A NO) + fan (5A NO)
code
PJ32C00000
PJ32C00100
Tab. 2.2.6
WARNING: the versions of instrument with display colours other than red are currently not available.
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2.2.2 NTC and PTC probes
All PTC and NTC probes conforming to the CAREL standard can be used, with resistance values of 985 Ω at 25°C, for PTC,
and of 10 kΩ for NTC. Below are some codes of the more common versions.
description
NTC probe, 6x15 mm bulb, plastic,
NTC probe, 6x40 mm bulb, metal
PTC probe, 6x40 mm bulb, metal, 1.5m long
NTC probe, wall-mounting
NTC probe, duct
operating range
index of protection
-50T50°C
-50T100°C
-50T100°C
-10T70°C
-10T70°C
IP67
IP67
IP67
IP30
IP40
CODE
NTC0**HP00
NTC0**W*00
PTC015W000
ASWT011000
ASDT011000
Tab. 2.2.2.1
2.2.3 Accessories
Transformers (only for instruments with 12Vac power supply).
description
TRA 12: 3 VA, 240/12Vac without fuse on the primary
TRA 12: 3 VA, 240/12Vac with fuse on the primary
code
TRA12VDE00
TRA12VDE01
Tab. 2.2.3.1
Serial adapters
description
optically-isolated RS485 serial module
additional module for HACCP
code
PJOPZ48500
PJOPZHACP0
Tab. 2.2.3.2
Programming key
description
programming key for plug-in
code
PJOPZKEY00
Tab. 2.2.3.3
Plug-in frames in various colours
description
pack of 30 frames, GREY (STANDARD)
pack of 30 frames, BLUE
pack of 30 frames, RED
pack of 30 frames, WHITE
pack of 30 frames, YELLOW
pack of 30 frames, ALUM. METAL
pack of 30 frames, BLUE METAL
pack of 30 frames, GOLD METAL
pack of 30 frames, STEEL METAL
code
PJOPZFG000
PJOPZFB000
PJOPZFR000
PJOPZFW000
PJOPZFY000
PJOPZFMA00
PJOPZFMB00
PJOPZFMG00
PJOPZFMS00
Tab. 2.2.3.4
Codes for kits: if requested by the customer and the quantity supplied is sufficient, the plug-in instruments can be
packaged in multiples of 10. The kit also allows the instrument the ordered together with the options and accessories
used by customer in the application. Customised programming of the parameters can also be requested.
The kit codes are defined according to customer request.
WARNINGS:
• the kits are packs of 10 instruments with the corresponding accessories; orders must indicate the total quantity of
instruments required (not the number of packs); the quantity ordered must be a multiple of 10, as partial packs are not
supplied;
• the quantity of each component in the kit is 10 units, except for the instruction sheet, which can be ordered in single
quantities;
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2.3 User interface, meaning of operating indicators and LED display
Figs. 2.3.1 and 2.3.2 shows the front panel of the plug-in: display and buttons. The front panel of
the instrument features a three-digit display (ref. 4 ) and three LEDs for backlighting the
buttons (refs. 1, 2 and 3 in Fig. 2.3.1), or alternatively three graphic symbols inside the area of
the display (refs. 1, 2 and 3 in Fig. 2.3.2).
These indicate:
this LED indicates the status (on or off) of the actuator controlled, (normally a compressor); the
button is back-lit by a green LED and is available only on the Top models. the button is backlit by
LED or the graphic symbol
appears on the display.
The status of the LED can be the following, to indicate:
always on
COMPRESSOR IN OPERATION
request pending for compressor activation
continuous flashing
continuous cycle on
flashing with 2 cycles and a pause
Tab. 2.3.1
Alarm signal: the button is backlit by LED or the graphic symbol
appears on the
display.
Defrost in progress: the button is backlit by LED or the graphic symbol
appears on
the display.
LED. The status of the LED can be:
defrost in progress
always on
request pending for defrost
continuous flashing
Tab. 2.3.2
Fig. 2.3.1
Fig. 2.3.2
THE LED DISPLAY SHOWS ONE OF THE FOLLOWING PIECES OF INFORMATION, ACCORDING TO THE
FUNCTION IN PROGRESS:
• in normal operation: value measured by the ambient probe or the second probe;
• when setting parameters: code of the parameter or the associated value;
• during an alarm event: flashing code of the alarm detected, alternating with the temperature value.
The temperature measured by the probe is displayed with resolution to a degree (ºC or ºF). The display range for the temperature is:
-50T90 ºC (or –50T127 ºF). For the parameters, the values can vary from -99 to +199 and in some cases from -127 to +127. The
unused segments of the left-most digit are normally always off; expansion modules (Serial 485 and HACCP) can be used to signal
states or parameter programming modes. For a complete description please refer to the expansion module manual.
2.3.1 Using the keypad
Three buttons (5, 6 and 7 in Fig.2.3.1) are used to perform the activation and deactivation of the instrument’s operating states
and set the parameters. The use of the buttons can be divided into two different situations: one in of normal operation, and the
other to modify the parameters. For each button, the following are the possible actions associated with both possibilities.
In normal operation and if pressed for more than 5 seconds:
• activates/deactivates continuous cycle (compressor).
In modify parameter mode:
• moves from one parameter to the next;
• increases the value of the parameter.
In normal operation:
• silences the audible alarm (only if featured);
• displays and/or sets the Set point;
• if pressed for more than 5 seconds not during an alarm: accesses the menu for setting type ‘F’ parameters
(frequent);
• if pressed when turning on the instrument, together with the
button, activates the parameter RESET
procedure.
In modify parameter mode:
• displays the value of the selected parameter /exits the display;
• if pressed for more than 5 seconds in modify parameter mode, saves the changes.
In normal operation:
• if pressed for more than 5 seconds: starts a manual defrost, if enabled.
In modify parameter mode:
• moves from one parameter to the previous;
• decreases the value of the parameter.
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3. INSTALLATION
The installation operations for the plug-in controls can be grouped as follows:
1. mechanical installation;
2. electrical connections: probes, power supply and actuators;
3. setting of the operating parameters.
3.1 Mechanical installation
1. Insert the instrument in the previously created hole as per the drilling template, 71x29 mm;
2. for mounting using the bracket (for all Eco versions): lock the instrument onto the panel, by sliding the bracket;
3. for mounting using screws from the front panel (only for the Top versions): rest the instrument on the front panel and, using
the screwdriver tighten the two screws, making sure the two teeth are properly clicked in. The following describes the
procedure in detail. The thickness of the fastening panel must not exceed 3 mm;
3.1 remove the front panel frame and check that the two attachment teeth are in their slot (they must not protrude from
the dimensions of the drilling template). If necessary, unscrew the two screws, applying pressure. Do not unscrew
too much, the screw must not be raised from the front panel;
3.2 connect all the cables to the corresponding terminals or insert the pre-wired removable terminals onto the
corresponding connectors;
3.3 insert the instrument in the hole in the panel, placing the connected cables inside, and hold it in position by pressing
in the centre of the front panel; using the screwdriver , tighten the lower screw 90°, the tooth must come out of its
slot and click onto the panel, then tighten up until the front panel is secure;
3.4 repeat the same operation for the upper screw;
3.5 if the tooth does not click onto the panel (max. thickness 3.0 mm), unscrew the screw, applying pressure at the
same time with the screwdriver so that the tooth moves back. As mentioned in point 1, do not unscrew too much,
the head of the screw must not be raised from the surface of the front panel;
3.6 the two screws must be tightened with the same pressure, so as to not leave one corner higher than the other. DO
NOT tighten excessively, when the front panel is secure simply tighten a further ½ turn to compress the
gasket;
3.7 apply the front panel frame.
4.
If having to remove the instrument, proceed as follows:
4.1 unclip the front panel frame;
4.2 unscrew the lower screw, at the moment the front panel leaves the panel keep pressure on the screw and unscrew a
further 90° to make the tooth go back into its slot;
4.3 repeat for the upper screw;
4.4 remove the instrument from panel, keeping it horizontal;
WARNINGS: the screwdriver which should be used is the Pozidriv 1 (PZD1) Phillips head screwdriver. Do not use
motorised screwdrivers.
3.2 Electrical connections
The instruments in the PJ32 series feature different terminals for the connections:
• the Eco versions use the traditional fixed screw terminals;
• the Top versions, on the other hand, feature removable terminals with two types of cable connection blocks: screw, or by
crimping.
The versions with removable terminals offer considerably simplified connection of the instrument, both for installation and
maintenance. Furthermore, connection errors are avoided, as the three connection blocks have a different number of pins.
3.2.1 Power supply
The plug-in instruments are connected to the power supply using terminals 8 and 9 in the Eco versions, or with the two-way
removable block to be inserted in the terminals 8 and 9 for the Top versions.
The voltage supplied to these terminals must correspond, within the tolerance indicated, to the value on the instrument’s
connection label. The values are 230Vac, 115Vac and 12Vac/Vdc, according to the code.
The electrical insulation featured in the instrument, for the versions with mains power supply (230Vac and 115Vac),
corresponds to reinforced insulation. The versions with 12Vac/Vdc power supply do not feature insulation.
To guarantee correct operation during voltage drops, all the plug-in instruments feature low power operation: below a certain
threshold the current supplied to the display is gradually reduced, up to the total switching off of the display and LEDs. All the
other functions are guaranteed within the maximum allowed voltage drop limits; in particular, the status of the relay is
maintained.
On return of the normal power supply conditions, the display and the LED are reset.
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plug-in
Fig. 3.2.1.1
3.2.2 Special warnings
For the direct connection of the instruments and the layout and checking of the wiring, the following warnings must be carefully
read and the diagrams adhered to; errors in connection can cause danger to the safety of the user and damage the instruments and
connected components. Also remember that the units must be fitted with all the electromechanical safety devices required to ensure
correct operation and the complete safety of the user.
For the 12Vac versions, if the power supply available:
• is mains power, a safety transformer is required (CAREL code TRA12VDE01 or TRA12VDE00) to guarantee the double
insulation between the power supply and the low voltage electronics inside. If required, the protective fuse placed in series with the
primary (32 mAT, for code TRA12VDE00) is indispensable. The connection between the transformer and the instrument must be
as short as possible;
• is already low voltage, but not 12Vac, a suitably rated adapting transformer must be used: double insulation between primary
and secondary, and suitable surge features on the primary (2000V for applications in industrial environments).
• is 12Vac, the instrument can be powered directly, evaluating the following conditions. The power line must not be connected
to the actuators and must not be near other connections which may cause high intensity disturbance. In case of doubt, and to
guarantee conformity to electromagnetic immunity standards, an insulating transformer, with the characteristics described in the
previous point, is recommended.
If more than one control with a 12Vac power supply is connected to the same transformer, the polarity of the wiring must be
checked, in the sense that each terminal of the transformer must be connected to the same terminal of all the controls. In this case,
conformity to the EMI standards must be evaluated by the manufacturer/installer.
3.2.3 General warnings – installation and connection environments
Avoid mounting the boards in environments with the following characteristics:
• relative humidity over 90% or presence of condensation;
• heavy vibrations or knocks;
• exposure to continuous jets of water;
• exposure to aggressive and polluting atmospheric agents (e.g.: sulphur and ammonia gases, saline mist, smoke) which may cause
corrosion and/or oxidation;
• high magnetic and/or radio-frequency interference (thus avoid installation near transmitting antennae);
• exposure to direct sunlight and atmospheric agents in general;
• large and rapid fluctuations in ambient temperature;
• environments where explosives or mixes of inflammable gases are present;
• exposure to dust (formation of corrosive patina with possible oxidation and reduction of insulation);
These warnings must be followed for connection:
• electrical power supply other than that prescribed may seriously damage the system;
• use cable ends that are suitable for the terminals. Loosen each screw and insert the cable end, then tighten the screws. On
completing the operation, tug the cables lightly to check they are sufficiently tight;
• separate the probe signal and digital input cables from inductive loads and power cables as much as possible, to avoid any electromagnetic
disturbance. Never lay power cables and probe cables in the same cable channels (including those for the electrical cables). Do
not install the probe cables in the immediate vicinity of power devices (contactors, thermo-magnetic devices or other);
• reduce the length of the sensor cables as much as possible, and avoid spirals around power devices. The probes must be connected
using shielded cables (minimum cross-section for each lead: 0.5 mm2);
• the probes can be installed up to a maximum distance of 100m from the control. To extend the distance of the probes, use cables
with a minimum cross-section of 1 mm², shielded where possible. In this case, the shield must be connected to the common of the
probe. Do not earth the other end of the shield (the sensor end);
• only use IP67 probes as end defrost probes; place the probes with the vertical bulb upwards, so as to assist the drainage of any
condensation. Remember that the thermistor temperature probes (NTC or PTC) have no polarity, so the order of connection of the
ends is not important;
• avoid direct contact with the internal electronic components.
Wiring diagrams for multiple units, wiring examples for the serial connection of the instruments:
MAIN: mains power supply, 230 or 115Vac;
Cod. +030221881 rel. 1.3 - 03/05/2006
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plug-in
Serial: serial connection to the supervisor system;
TRF: 3VA transformer.
* only on last module
Fig. 3.4.2.1
WARNING: the diagrams show the serial connection including the RS485 serial interface adapter (see options) which is
external to the instrument and must be powered separately. Versions with 115 and 230 Vac power supply are also available for
the serial adapter. For reasons of EMI compatibility, a 3VA transformer (TRF in fig. 3.4.2.1) (see options) is required for each
PJ32 instrument with 12Vac power supply.
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plug-in
3.2.4 Electrical connections, PJ32
Fig. 3.2.5.1
Warnings:
• before connecting the power, check the correct value of the power supply as shown on the label of the instrument;
• all models use NTC probes, except for the PJ32S6E0*, which uses PTC probes;
• for models S200 and S201 the alarm relay can be set as normally energised or normally de-energised, using parameter H1.
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plug-in
3.3 Setting the main operating parameters
The plug-in series instruments are supplied ready to use. They are in fact programmed in the factory (default settings) to
respond to the more common requirements. The programming is performed by assigning all the parameters the more frequently
required value; the table below lists the parameters and the corresponding default value.
code
description
ambient probe calibration
measurement stability (probe delay and range limit), 1 = fast
selection of probe to display (0 = ambient, 1 = defrost)
selection °C/°F (0=°C)
control differential (hysteresis)
minimum set allowed to the user
maximum set allowed to the user
enable alarm Ed (1=enable)
set automatic variation of the Set point for night operation
compressor start delay at instrument on
minimum time between 2 successive starts of the compressor
minimum compressor off time
minimum compressor on time
Duty Cycle safety relay ON time
continuous cycle duration
alarm bypass time after continuous cycle
type of defrost (0=heat el., 1=gas, 2=heat. el. time, 3=gas time)
interval between two defrosts
end defrost temperature
maximum defrost duration or effective duration for d0=2 or
d0=3
d4 defrosting at instrument on (1=yes)
d5 defrost delay
d6 display off during defrost (1=yes)
dd post-defrost dripping time
d8 alarm bypass time after defrosting
d9 defrost priority over minimum compressor times (1=yes)
dC time basis (0 =hours/min, 1=min/s)
A0 alarm/fan differential
AL shift low temperature alarm threshold
AH shift high temperature alarm threshold
Ad temperature alarm delay
A4 digital input configuration
A7 alarm input detection delay
F0 fan operating mode
F1 fan on temperature
F2 fans off with compressor off (1=yes)
F3 fans off during defrost (1=yes)
Fd fan time-out during post dripping
H0 serial address
H1 IR34S: enable defrosting, IR34C: multifunction relay function
H2 disable keypad, 0=disabled
H4 disable buzzer
L1 control set point
/C
/2
/4
/5
rd
r1
r2
r3
r4
c0
c1
c2
c3
c4
cc
c6
d0
dI
dt
dP
type
d
min
d
max
default
F
C
C
C
F
C
C
C
C
C
C
C
C
C
C
C
C
F
F
F
-127
1
0
0
0
-50
-50
0
-20
0
0
0
0
0
0
0
0
0
-50
1
127
15
1
1
19
127
127
1
20
15
15
15
15
100
15
15
3
199
127
199
0
4
0
0
2
-50
60
0
3
0
0
0
0
0
4
2
0
8
4
30
C
C
C
F
F
C
C
C
F
F
C
C
C
C
F
C
C
F
C
C
C
C
S
0
0
0
0
0
0
0
0
0
0
0
0
0
0
-50
0
0
0
0
0
0
0
-50
1
199
1
15
15
1
1
19
127
127
199
4
199
1
127
1
1
15
199
1
1
1
127
0
0
1
2
1
0
0
0
0
0
0
0
0
1
5
1
1
1
1
1
1
0
4
unit of
measure
(**)
°C/°F x 0,1
°C/°F
°C/°F
°C/°F
°C/°F
min
min
min
min
min
hours
hours
hours/min
°C/°F
min/s
min
min
hours
°C/°F
°C/°F
°C/°F
min
min
°C/°F
min
°C/°F
Tab. 3.3.1
(**) unit of measure (hereafter u. of m. in the tables).
To achieve the maximum performance from the controls, or in the case of special needs, the values of the operating parameters
can be modified. The following notes describe the factory settings and the parameters which are more frequently modified (set
point, differential, etc.). Furthermore, for convenience, all parameters which should be checked before operating the unit are
indicated.
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plug-in
Based on the factory settings, the main functions are the following:
• PJ32S: configured as a thermostat, with operation in degrees centigrade, set point at 4ºC and differential of 2ºC. The
DEFROST operation is enabled by time at 8 hour cycles lasting 30 minutes (compressor stop only). The high and low
temperature alarms are disabled. In the case of operation in continuous cycle, the duration is 4 hours and the temperature alarm
is bypassed for 2 hours from the end of the cycle.
• PJ32Y, PJ32X: have the same settings as the PJ32S. Furthermore, these are programmed to manage defrosting using
electrical elements, with operation based on time for the X version, and with the second probe for the Y model. The display of
the temperature during defrosting remains on the last value acquired before the start of the defrost. There is an evaporator
dripping time of two minutes after the defrost, and the high temperature alarm is bypassed for one hour from end defrost.
• PJ32C: on top of the functions of the IR32Y, these units are set to manage the evaporator fans, which are stopped when the
compressor is off and during defrosting. Furthermore, a one minute pause is set for the fans after dripping, to allow the
evaporator to return to operating temperature before starting forced ventilation. In the IR32C, the defrost is stopped when the
probe on the evaporator measures 4ºC (defrost by temperature).
If many of the instrument’s parameters need to be modified during installation, it may be useful to set the complete
configuration of one instrument, and then copy it using the KEY accessory; in this case the operation can be performed in just a
few seconds, with a complete copy of all the parameters.
3.4 Table summarising the parameters to be checked before installation
code
parameter
control
rd control differential
parameters
L1 control set point
type of defrost (0=heating element, 1=hot gas, 2=heating
d0
element by time, 3=hot gas by time)
defrost
parameters
dI interval between defrosts
dt end defrost temperature set point
Ad temperature alarm delay
alarm parameters AL shift low temperature alarm threshold
AH shift high temperature alarm threshold
enable defrosting mod. S and selection of multifunction relay
other settings
H1
function (alarm)
type min max
F
0 +19
-50 127
uom
°C/°F
°C+/°F
def
2
4
C
0
1
flag
0 (*)
F
F
F
F
F
0
-50
0
0
0
199
+127
+199
+127
+127
h
°C/°F
min
°C/°F
°C/°F
8
4
0
0
0
C
0
1
flag
1
Tab. 3.4.1
(*) WARNINGS:
• for all models where the second probe is not used or used for the display of the product temperature, or for the models with
the alarm relay, parameter d0 must be set for timed defrost, in this way, any alarms from the second probe are not signalled. To
stop the running of the defrost cycles, parameter dI must also be set to 0;
• the S models with two probes (codes PJ32S00 and S0P) have been designed to use the second probe for measuring and
displaying the food storage temperature (Food Probe). To manage the second probe, these models are in fact programmed as Y
models, with all the corresponding parameters, but do not have the defrost relay; it is clear that they must be set so as defrosting
is not enabled, or, if necessary, only timed defrost with compressor off;
• the S models with alarm relay, PJ32S20*, to use the function of programming the status of the alarm relay by parameter H1
are set as X models; as they don’t have the defrost relay they must be programmed so as defrosting is not enabled, or, if
necessary, only timed defrost with compressor off (dI=0 or dI>0 for cyclical defrost).
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4. PARAMETERS - DESCRIPTION
4.1 The configuration parameters
The parameters can be classified in two groups for setting:
• frequent parameters (indicated by type F in the following tables);
• configuration parameters (type C), whose selection is ‘password’ protected to prevent unwanted tampering.
The assigning of the parameters to groups F and C can also be programmed, but only via serial access using the key or a
supervisory system.
Following is a description of each parameter, indicating the versions it is available in and the possible values.
Furthermore, the default value (def.) is listed, that is the value assigned to the parameter in the factory.
4.2 Classification of the parameters
The parameters, as well as being divided by type, are also grouped in logical categories identified by the fist letters of the
parameters themselves. Following is a list of the existing categories, with the meaning and identifying letters.
PS
category
/
r
C
d
A
F
H
indicates the password, this must be entered to access the configuration parameters (C)
description
temperature probe management parameters
temperature control parameters
compressor management parameters
defrost management parameters
alarm management parameters
evaporator fan management parameters
general configuration parameters
Tab. 4.2.1
4.3 The password PS
This is deliberately included to complicate access to type C parameters, so as to prevent accidental or unauthorised
modifications. Type C parameters are in fact those which modify the configuration of the control. Once entered into the
configuration parameters section using the password, the control also allows, for convenience, type F parameters to be
modified.
When displaying the type F parameters, type C parameters are accessed as follows:
1. select the password parameter PS;
2. enter and confirm the value 22, the correct password;
3. all the parameters, F and C, can now be selected on the display.
4.4 / = temperature probe management parameters
/C
/2
/4
/5
probe parameters
ambient probe calibration x10 (tenths of a degree)
measurement stability
display control / food storage probe
display in °C/°F (0=°C, 1=°F)
type min max
F -127 +127
C
1
15
F
0
1
C
0
1
uom
def
°C/°F 0.0
4
0
flag
0
Tab. 4.4.1
/C: calibration or Offset
This parameter allows the temperature shown on the display to be corrected. The value assigned to this parameter is in fact
added to (positive value) or subtracted from (negative value) the temperature measured by the probe. For example, if the
temperature displayed needs to be decreased by 2.3 degrees, set /C=-23.
The Offset can range from -127 to +127, with a variation in the reading between -12.7 and +12.7 (°C/°F). The parameter does
not act on the defrost probe (in all the models with two probes). Def.: 0.0 (no Offset to probe reading).
Available on all models.
/2: measurement stability
Defines the coefficient used to establish the temperature measurement. Low values assigned to this parameter offer the prompt
response of the sensor to variations in temperature; the reading is however more sensitive to disturbance. High values slow
down the response but guarantee greater immunity to disturbance, that is a more stable and more precise reading. The setting is
also used also for the second probe, if present. Value from 1 to 15. Def.: 4.
Available on all models.
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plug-in
/4: display control or food storage probe
For instruments with two probes (S, Y, C), this parameter selects whether to display the temperature of the control probe
(ambient probe) or the second probe, which in this case is used only to display the temperature of the food. The use of the
second probe for this purpose means that it can no longer be used to control defrosting; the corresponding parameters must be
modified as a consequence. The parameter /4 only selects the value to be displayed, all the other display and control modes
remain unchanged.
In the versions with just one probe (ambient), the parameter, when present, must always be zero (0). Def.: 0, display ambient probe.
Available on models Y, C and S with two probes.
Warning: the S models with two probes have been designed only to use the second probe for the measurement and display of
the food storage temperature (Food Probe). To manage the second probe, these models are in fact programmed as Y models,
with all the corresponding parameters; it is clear that they must be set so as defrosting is not enabled, or, if necessary, only
timed defrost (d0=2, dI=0, dt=-50), furthermore, if the second probe is not used, it must be disabled (/4=0 and d0=2), to avoid
the signal E1 (probe alarm).
/5: °C or °F selection
Defines the unit of measure used for the control and the display.
0 = degrees centigrade, 1 = degrees Fahrenheit.
Warning: when changing from one unit of measure to the other, all the values of the temperature parameters must be modified
in the new unit of measure.
Def.=0, operation in degrees centigrade. Available on all models.
4.5 r = temperature control parameters
rd
r1
r2
r3
control parameters
control differential (0= 0.5 °C)
minimum set allowed
maximum set allowed
enable alarm ED for models Y, X, C
type
F
C
C
C
min max
0 +19
-50 r2
r1 +127
0
1
uom
def
°C/°F
2
°C/°F -50
°C/°F
60
flag
0
Tab. 4.4.1
rd: control delta
Sets the value of the differential, or hysteresis, used in the temperature control. A narrow, that is numerically small differential,
guarantees an ambient temperature which stays close to the set point, yet with frequent activation and deactivation of the main
actuator (normally the compressor). The life of the compressor can still be protected by suitably setting the parameters which
limit the number of activations per hour and the minimum off time (see C parameters).
In all the refrigeration instruments the differential is set to the right of the set point, as indicated in the figure (DIRECT
operation):
Fig. 4.5.1
Def.: rd=2
Available on all models
r1: minimum SET allowed
Determines the minimum value which can be set for the set point. This parameter prevents the user from setting the set point
lower than the value indicated by r1. Def.: -50
r2: maximum SET allowed
Determines the maximum value which can be set for the set point. This parameter prevents the user from setting the set point
higher than the value indicated by r2. Def.: +60
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plug-in
r3: enable alarm ED
For models Y, X, C. With r3=1, the alarm is enabled and indicates end defrost due to the maximum time being reached.
Warning: for the model S with defrosting enabled (H1=1), the alarm is not present in that the operation is by time only with
compressor off. If required, the value set via the serial connection must be 0.
Def.: 0 alarm ED inhibited.
4.6 c = compressor management parameters
C0
C1
C2
C3
C4
Cc
C6
compressor parameters
compressor start delay at instrument on
minimum time between 2 successive starts of the
compressor
minimum compressor off time
minimum compressor on time
duty setting (compressor safety, 0=OFF,100=ON)
continuous cycle duration
alarm bypass after continuous cycle
type min
C
0
C
0
C
C
C
C
C
0
0
0
0
0
max
15
15
uom
min
min
def
0
0
15
15
100
15
15
min
0
min
0
min
0
hours
4
hours
2
Tab. 4.6.1
c0: start delay of the compressor and the fans (if managed) at instrument on
At the moment the control is turned on, the start-up of the compressor and evaporator fans is delayed by a time (minutes) equal
to the value assigned to this parameter. This delay allows the compressor to be protected against repeated starts in the case of
frequent voltage drops or power failures. For example, setting c0=6 forces the compressor to wait 6 minutes before starting
from when the power returns. In the case of systems with more than one compressor, parameter C0 can also be used to avoid
simultaneous start-ups of the units, simply by setting each compressor a different value for C0.
Def.: c0=0 (no minimum delay for the activation of the
compressor when the instrument is turned on).
Available on all models
t
Fig. 4.6.1
c1: minimum time between 2 successive starts of the compressor
Sets the minimum time (in minutes) that must elapse between two start-ups of the compressor, irrespective of the temperature
and the set point. Setting this parameter can limit the number of activations per hour. For example, if the maximum number of
activations allowed per hour is 10, simply set c1=6 to ensure this limit is respected.
Def.: c1=0 (no minimum time between two activations).
Available on all models.
t
Fig. 4.6.2
C2: MINIMUM COMPRESSOR OFF TIME
Sets the minimum time, in minutes, that the compressor stays off. The compressor is not re-started until the minimum time
selected (c2) has passed since the last shut-down. This parameter is useful in ensuring pressure equalisation after the shut-down, in
the case of systems with hermetic and scroll compressors.
Def.: c2=0 (no minimum OFF delay time).
Available on all models.
t
Cod. +030221881 rel. 1.3 - 03/05/2006
Fig. 4.6.3
18
plug-in
c3: minimum compressor on time
Sets the minimum time the compressor stays on. The compressor is not shut-down unless it has been on for the minimum time
selected.
Def.: c3=0 (no minimum operation).
Available on all models.
t
Fig. 4.6.4
c4: duty setting or safety probe
In the event of the control probe fault alarm (that is the ambient probe is short-circuited or disconnected) this parameter
ensures the operation of the compressor until the fault is resolved. In practice, the compressor, not being able to be activated
according to temperature (due to the probe fault), works cyclically with an ON time equal to the value assigned to parameter c4
(in minutes) and a fixed OFF time of 15 minutes. There are two values for c4 which create special conditions.
If c4 = 0, in the event of an ambient probe fault, the compressor will be always off;
if c4 = 100, the compressor will remain always on; and the 15 minute off time is not considered.
• For other values of C4, at the moment a probe error (E0) is detected, the duty setting cycle starts from the current status of
the compressor:
1. if ON, it remains ON for the set time (C4), considering the time it has already been ON;
2. if OFF, it remains OFF for the OFF time, again considering the time it has already been OFF.
The time settings for compressor C1, C2, C3 are in any case always respected.
• If the control probe error occurs when the control is defrost mode or continuous cycle, the control instantly exits this status
and activates duty setting. To re-activate the defrost or continuous cycle operation, the ambient probe must be reset.
Remember that in the event of ambient probe errors, manual defrosts can not be performed.
If the probe error is no longer present, the machine returns to normal operation. The compressor again takes on the logic of the
control, respecting the times C1, C2, C3.
Def.: 0 (compressor always OFF in the event of ambient
probe fault).
Available on all models.
t
Fig. 4.6.5
cc: continuous cycle duration
This is the time in hours that the compressor stays continuously on in order to lower the temperature to the set point. This
function is used when rapid product temperature drops are required, for example, after loading the store; in this phase the
temperature can fall below the set point by the value set using parameter AH. If cc=0, continuous cycle is not enabled. The
control exits the continuous cycle procedure after the time set for the parameter cc or when the minimum temperature has been
reached (see minimum temperature alarm, parameter AL).
Def.: 4 (hours). Available on all models .
c6: alarm bypass after continuous cycle
This is the time, in hours, that the temperature alarm is disabled after a continuous cycle. In practice, if the temperature of the
refrigeration unit, after the continuous cycle, falls due to inertia below the minimum temperature level (set point - AL) the
activation of the low temperature alarm is delayed for a time equal to c6. Remember that at the minimum temperature (set point
- AL) the continuous cycle is forced off.
Def.: 2 (hours). Available on all models.
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4.7 d = defrost management parameters
d0
dI
dt
dP
d4
d5
d6
dd
d8
d9
d/
defrost parameters
type min max
type of defrost (0=heat. element, 1=hot gas, 2=heat elem. by time, 3=hot gas by time)
C
0
3
interval between defrosts
F
0
199
end defrost temperature set point
F
-50 +127
maximum defrost duration
F
1
199
defrost at instrument on (0=no, 1=yes)
C
0
1
defrost delay at instrument on or from multifunction input
C
0
199
display off during defrosting (0=no, 1=yes)
C
0
1
dripping time
F
0
15
alarm bypass time after defrosting and/or door open
F
0
15
defrost priority over compressor protection (0=no, 1=yes)
C
0
1
defrost probe reading
F
-
uom def
flag
0
hours
8
°C/°F 4
min
30
flag
0
min
0
flag
1
min
2
hours
1
flag
0
°C/°F
Tab. 4.6.1
d0: type of defrost
Sets the type of defrost for the instruments fitted with defrost relay:
d0
0
1
2
3
type of defrost
heating element
hot gas
heat. element by time
hot gas by time
Tab. 4.7.2
Def.: d0=0, defrost using heating element. Available on models Y, X and C.
Warning: for the S models with two probes or with alarm relay, a time must be set (recommended d0=2).
dI: interval between defrosts
The defrost is performed periodically at an interval equal to the value of dI (in hours or minutes, see parameter dC). The
interval dI starts to be counted from the previous defrost beginning. If the time is equal to 0 (dI=0), the defrost is not
performed, except when forced from the keypad or digital input. During defrosts the temperature alarms are inhibited.
Warnings: possible errors in measuring the times must be taken into account, typically ±5 % and maximum ±10 %.
Def.: 8 hours - Available on all models.
For the S models with two probes or with alarm relay, this must be set to zero to exclude cyclical defrosts.
dt: end defrost temperature set point
For units fitted with end defrost probe (Y and C), this parameter allows an evaporator temperature to be set at which the defrost
is stopped (the evaporator temperature is measured by the defrost probe). If, at the start of a defrost cycle, the temperature
measured by the defrost probe is greater than the set end defrost value, the cycle is not performed. In the event of defrost probe
failure, the control performs a timed defrost with a duration equal to the value set for dP. The same is true if the end defrost set
point can not be reached, the defrost is stopped after a maximum time equal to the value, in minutes, of dP, and the error Ed is
displayed (if enabled by r3) and stays on until a correct defrost cycle is performed, that is one which ends by temperature.
Def.: 4 ºC - Available on models Y and C.
dP: maximum defrost duration
Determines the duration of the defrost in minutes (or seconds, see parameter dC). For instruments without evaporator probe (S
with H1=1 and X) this parameter represents the effective duration of the defrost.
Def.: 30 min. Available on all models.
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d4: defrost at instrument on
Activates a defrost cycle when the instrument is turned on. The request for defrost when the unit is turned on has priority over
the activation of the compressor and the activation of the continuous cycle.
The possible values are:
0 = no, no defrost is performed when the instrument is turned on;
1 = yes, a defrost cycle is performed when the instrument is turned on.
Forcing a defrost cycle when the instrument is turned on may be useful in special situations, e.g. if the system is subject to
frequent voltage drops. In fact, in the event of power failures the instrument's internal clock, which calculates the interval
between two defrosts, starting from zero, is reset. If the frequency of the voltage drop were, in an extreme case, greater than the
defrost frequency (e.g. a voltage drop every 8 hours against a defrost every 10 hours), the control would never perform a
defrost. In this type of situation it is better to activate the defrost when the unit is turned on, above all if the defrost is controlled
by temperature (probe on the evaporator), so unnecessary defrosts are avoided or at least reduced in time. In the case of systems
with many units, if defrost on start-up is selected, after a voltage drop all the units will start a defrost. This may cause overloads.
To avoid this, parameter d5 can be exploited, which allows a delay to be set before the defrost starts, a delay which obviously
must be different for each unit.
Def.: d4=0, the instrument does not perform a defrost when the unit is turned on. Available on all models.
d5: defrost delay at instrument on or from multifunction input
Represents the time which must elapse between when the control is turned on and the start of the defrost.
In the case where the digital input is used to enable the defrost (see parameter A4=2) or to start a defrost from an external
contact (see parameter A4=3), this parameter represents the delay between the enabling of the defrost, or its request, and the
effective start of the cycle. The defrost from digital input (see parameter A4) can be exploited to perform defrosts in real time.
Simply connect a timer to the multifunction digital input (again see parameter A4). The defrost will be activated when the timer
contact is closed. In the case where more than unit is connected to the same timer, it is recommended to set parameter d5 to
delay the defrosts to a different time for each unit. Furthermore, to avoid unnecessary defrosts controlled by the instrument's
internal clock, it is suggested to set parameter dI=0 (only manual defrosts from the keypad or multifunction contact) or to set dI
to a value which is greater than the maximum set interval, allowing operation with safety defrosts in respect to the external
timer.
Def.: d5=0 (no delay in the start of the defrost from when the instrument is turned on or from the activation of the multifunction
input)
Available on all models.
d6: display off during defrost
Blocks the display of the ambient temperature during the defrost cycle at the last value read before the current defrost.
The display normally returns when the measurement first reaches the set point or, in any case, after the set alarm bypass time
after defrost (parameter d8).
If the display during defrost is enabled, the instrument displays alternatively the message dF and the value read by the control
probe. This warns that possible high temperatures are due to defrost in progress. The off mode is also valid for the display of the
second probe (Par. /4), if enabled.
Def.: d6=1 (during defrost the last temperature measured before the start remains on the display). Available on all models.
dd: dripping time
This parameter forces the compressor and the evaporator fans off after a defrost, in order to allow the evaporator to drip.
The value of this parameter indicates the minutes of rest, if dd = 0 no dripping is set, therefore at end defrost the compressor
starts immediately.
Def.: dd=2 min. Available on all models.
d8: alarm bypass time after defrost
Indicates the time the high temperature alarm is bypassed from the end of the defrost
Def.: d8=1 bypass time. Available on all models.
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d9: defrost priority over compressor protection
Overrides the compressor protection times (c1: minimum time between 2 successive starts, c2: minimum off time and c3:
minimum on time) at the start of the defrost. The possible values are:
0 = the protection times are respected;
1 = the protection times are overridden; the defrost has priority and does not respect the compressor time settings.
It is useful, for example, with hot gas defrost to avoid delaying the defrost in the case where the compressor has just stopped
and there is a minimum time between two starts. Remember, however, that in this case the maximum number of activations
per hour of the compressor may not be respected.
Def.: d9=0 the defrost respects the compressor time settings (as default these are set to zero). For instruments with a serial
number less than 5000 d9=1 by default. Available on all models.
d/: defrost probe reading
Selecting this parameter displays the value read by the defrost probe for instruments where fitted. Once the parameter d/ has
been selected, the value of the temperature measured by the defrost probe can not be modified but only read. Available on
models Y and C.
dC: time basis
Modifies the unit of measure used to count the times for parameters dI (defrost interval) and dP (defrost duration). The possible
values are:
0 = dI expressed in hours and dP in minutes;
1 = dI expressed in minutes and dP in seconds.
Parameter dC=1 can be useful to test the operation of the defrost function with reduced times. Remember , however, that if
the defrost requires the compressor to be on (hot gas defrost) and parameter d9=1, the compressor risks being damaged
due to an excess of start-ups in a short time.
Parameter dC=1 is on the other hand very useful in the event where versions Y and X need to be used to manage air driers. The
defrost cycle thus becomes the condensation discharge cycle, which must occur at close intervals (minutes) and for very brief
durations (seconds).
Def.: dC=0, that is dI, defrost interval, in hours and dP, maximum defrost duration, in minutes. Available on all models.
4.8 A = alarm management parameters
A0
AL
AH
Ad
A4
A7
alarm parameters
alarm and fan differential (0= 0.5 °C / °F)
low temperature alarm (difference from set)
high temperature alarm (difference from set)
temperature alarm delay
multifunction input configuration
external alarm detection delay (A4=1, Multifunct. Input)
type min max
C
0
+19
F
0
+127
F
0
+127
C
0
199
C
0
4
C
0
199
uom def
°C/°F 0
°C/°F 0
°C/°F 0
min 120
0
min
0
Tab. 4.8.1
A0: alarm and fan differential
Represents the differential used to activate the high and low temperature alarms (AL and AH) (see figure below) and fan
management (see parameters F). In the case of an alarm, as seen in the figure, the value of A0 determines the actual activation
of the temperature alarms.
Def.: 0 °C (equal to 0.5 °C). Available on all models.
ON
ON
allarme bassa temperatura
low temperature alarm
allarme alta temperatura
high temperature alarm
A0
A0
OFF
OFF
AL
AH
t
Set Point
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Fig. 4.8.1
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AL: minimum temperature alarm
Selects the low temperature alarm. The value of AL does not indicate the alarm temperature but rather the maximum
difference allowed below the set point.
For all models:
low temperature alarm = (set point) - (value of AL)
Note that changing the set point automatically changes the low temperature alarm, in that maximum difference allowed remains
the same (=AL). The low temperature alarm has an automatic reset. This means that if the temperature returns above the
threshold value +A0, the alarm signal automatically stops. Finally, please remember that the low temperature alarm is also used
in the continuous cycle (see corresponding section on page 59). In fact, if the temperature falls to the alarm level the continuous
cycle is automatically deactivated, even if the selected period has not elapsed. The deactivation does not give rise to an alarm
signal.
Def.: AL=0 (low temperature alarm inhibited). Available on all models.
AH: high temperature alarm
Selects the high temperature alarm. The value of AH not indicates the temperature of alarm but rather the maximum difference
allowed above the set point (working point).
Per all models:
high temperature alarm = (set point) + (value of AH)
Note that changing the set point automatically changes the high temperature alarm, in that maximum difference allowed remains
the same (AH). The high temperature alarm also has an automatic reset. When the temperature falls below the threshold value –
A0 the alarm signal automatically stops.
Def.: AH=0 (high temperature alarm inhibited). Available on all models.
Ad: temperature alarm delay
Indicates after how many minutes the temperature alarm is signalled from when it is detected. If the temperature, after the delay
Ad, is back within the allowed limits, the alarm is not signalled.
Setting a delay to signal of the temperature alarms may help eliminate false alarms due to interference on the probe signal or
situations lasting a short time (for example, opening the cold room door briefly).
The temperature alarm delay has no effect on two special functions: defrost and continuous cycle. To delay any temperature
alarms after these functions, parameter d8 for defrost and c6 for continuous cycle must be modified. Remember that during
defrost and continuous cycle no temperature alarms are generated.
Def.: Ad=0 (instant temperature alarm). Available on all models.
A4: Multifunction digital input configuration
The MULTIFUNCTION digital input can assume different meanings according to the value attributed to this parameter, and
according to the model of control used. Following is a description of the possible functions:
A4 = 0: input not active
The Multifunction digital input is not used. This is the default value for all versions.
A4 = 1: external alarm
An external alarm requiring immediate intervention can be connected to the digital input (for example, high pressure or
compressor thermal overload alarm). In particular, the alarm is detected when the contact opens (normal operation with contact
closed). The management of the alarm can be instant, or with a delay according to the value of parameter A7 (0 = instant).
The activation of the alarm brings a bout a message on the display (see alarm IA), activates the buzzer, if featured, and causes
the following actions on the actuators:
compressor
fans
causes the compressor to shut-down from external alarm (immediate if A7=0 )
causes operation according to the fan parameters (F). If the external alarm is detected during a defrost or a
continuous cycle, the control exits the procedure
When the alarm stops, the machine returns to operation as follows:
DEFROST
compressor
defrosts can again be performed. The next starts after the set time dI (interval between defrosts)
if at the instant the alarm ends the compressor is on, it stays on for the minimum set time (parameter c2). If it is
off, it stays off for a minimum time equal to the minimum off time (parameter c3)
The configuration with delay (A7 > 0) is especially useful for managing the low pressure alarm. It is frequent, in fact, for the
unit to detect a low pressure alarm when first turned on, due to the environmental conditions and not a unit malfunction. Setting
an alarm delay avoids false signals. In fact, by carefully calculating the delay, if low pressure is due to environment conditions
(low temperature) the alarm will automatically return before the set delay elapses. The effect on the compressor, fans, defrost
and continuous cycle are the same, after the set delay, as above.
Warning: as already indicated in the installation instructions, to ensure the safety of the unit in the event of serious alarms (for
example, the pressure alarms), the unit must be fitted with all the electromechanical devices required to guarantee correct
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operation according to the standards in force. The electronic control on its own can not be used to guarantee safety in the event
of serious alarms.
For all models, including S with H1=1:
A4 = 2: enable defrost
An external contact can be connected to the multifunction input to enable or inhibit the defrost function. When the contact is
open, the defrost is inhibited, while it is enabled when the contact is closed. If the contact is closed and there is no request from
the controller, obviously the defrost is not performed. If the contact is closed and a defrost is in progress, opening the digital
input immediately stops the defrost and the unit returns to the normal operation (without performing the dripping phase). Upon
request for a defrost the corresponding defrost LED starts to flash, until the next enabling action (closing of the contact). This
function is useful, for example,, in the case of multiplexed showcases with hot gas defrost. These systems must be defrosted by
island and thus, at any one moment, some islands are enabled for defrost, while others are inhibited. Another use of the function
is to prevent defrosting the units available to the public during opening hours. Any defrost requests when the contact is open
will stay on hold until the closing of the contact.
A4 = 3: start defrost from external contact
This function allows the defrost to be started from an external contact. If the defrost is started using an external contact, all the
type 'd' parameters selected are valid. In particular, it may be useful to set dI=0 to enable manual defrosts or defrosts from
external contact only, excluding defrosts generated by the internal clock.
This function is useful in the case where real time defrosts are required. To perform these, simply connect a mechanical or
electronic timer to the digital input. When the contact of the timer moves from open to closed it enables the defrost request.
It may be the case, as mentioned in the description of parameter d5, that more than one unit is connected to the same timer.
Selecting a different value for d5 for each unit will avoid simultaneous defrosts.
Warning: the minimum duration must be 0.5 seconds.
t
timer
defrost
dP(1)
d5(2)
unit 1
defrost
dP(2)
d5(3)
Key:
t = impulse from the timer to start the defrost;
dP(1) = maximum defrost duration, unit 1;
d5(2) = defrost delay from external contact for unit 2. This
must be greater than dP(1), to avoid defrosting at the same
time.
The same is true for d5(3) and dP(3) for unit 3.
unit 2
defrost
dP(3)
unit 3
defrost request
Fig. 4.8.2
A4 = 4: curtain switch / night-time operation
Setting parameter A4 =4 manages the contact which signals the closing of the curtain on showcases or modifies the set point for
night-time operation. With the contact closed the set point is modified by the value r4 (set point variation for night-time
operation).
The following table summarises the functions assumed by the multifunction digital input, according the setting of A4.
value parameter A4
0
1
2
3
4
meaning
input not active
external alarm instant or delayed (A7)
enable defrost (closed = enabled)
start defrost on closing
curtain switch or night-time operation
S
♦
♦
♦
♦
♦
Y
♦
-
X
C
♦
♦
♦
♦
♦
♦
Tab. 4.8.2
Warning: parameter A4 is accessible on all models, but can only be used on those which effectively have the input, in
alternative to the second probe. When the input is not present, the value of A4 must be zero (0), indicated by the – (dash) in
Tab. 4.8.2.
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A7: external alarm detection delay (multifunction input)
Sets the delay (in minutes) for detecting the external alarm when A4=1.
Def.: A7=0. Available on all models.
4.9 F = evaporator fan management parameters
F0
F1
F2
F3
Fd
alarm parameters
fans subject to the fan controller (0=no, 1=yes)
fan shut-down temperature (effective temperature °C - °F)
stop fan when compressor off (0=no, 1=yes)
stop fans for defrost (0=no, 1=yes)
post dripping off
type min max
C
0
1
F
-50 +127
C
0
1
C
0
1
F
0
15
uom def
flag
0
°C/°F 5
flag
1
flag
1
min
1
Tab. 4.9.1
F0: fans subject to the fan controller
The fans can be subject to the fan controller, which manages them according to the temperature measured by the defrost probe.
Alternatively, the fans are always on during a defrost (see parameter F3), with the possibility of switching them off when the
compressor is off (see parameter F2), during the dripping period (see parameter dd) and for a further post dripping period (see
parameter Fd). The values allowed for this parameter are:
F0=0 (=no). In this case the fans are not subject to the fan controller, and are always on, except for the limits set by F2, F3, Fd
and, if necessary, by dd.
F0=1 (=yes). The fans are subject to the fan controller (see parameter F1) and parameters F3 and Fd, which have priority over
the controller.
Remember that if there is a dripping period (parameter dd), the fans are off in any case.
Def.: F0=0, not subject to the fan controller. Available on PJ32C.
F1: fan shut-down temperature (parameter operative only if F0=1).
The controller activates the fans only when the temperature of the evaporator is lower than the value set for F1. F1 is the
effective (real) temperature and not the difference from the set point. Once off, the fans start again when the difference
between the probe and the set point is equal to +A0, where A0 is the fan control differential (see the figure below).
Temp.evapor.
F1
F1-A0
t
Fig. 4.9.1
Def.: F1=5, as shown in the figure, the fans stay on until the evaporator temperature is less than 5°C. Available on PJ32C.
F2: stop fans with compressor off
Decides if the fans must be always on (excluding F3, dd and Fd) or only when the compressor is on.
F2=0 (= no): The fans are also on when the compressor is off
F2=1 (= yes): The fans are off when the compressor is off.
Def.: F2=1, fans off when the compressor is off. Available on PJ32C.
F3: stop fans for defrost
Decides if the fans must operate or not during defrost.
F3=0 (= no): the fans operate during the defrost.
F3=1 (= yes): the fans do not operate during the defrost.
Remember that during the dripping time, if featured, the fans are always off.
Def.: F3=1, evaporator fans off during defrost. Available on PJ32C.
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Fd: post dripping off (active both when F0=0 and F0=1)
The fans, after the defrost, can be stopped for a further period (in minutes) defined by the value of Fd. This is useful to allow
the evaporator to return to operating temperature after the defrost, thus avoiding forcing 'hot' air into the refrigerator. In the case
of management by fan controller, the time Fd does not need to be selected, in that the controller makes the fans start again when
the evaporator reaches operating temperature. If the fan controller is active (F0=1), assigning Fd a value other than zero means
the fans stay off for a time equal to the value of Fd, irrespective of the temperature of the evaporator.
Def.: Fd= 1 minute post-dripping stop. Available on: PJ32C.
Diagram summarising operation of the evaporator fans
fan management
(F0=1) no
yes (F0=0)
fans always
on?
fans managed by fan controller
yes
fans on when evaporator
temperature <F1-AD
fans off when
compressor
off?
no
fans off when evaporator
temperature >F1
F2=0
F2=1
yes
F2=1
fans off when
compressor
off?
no
F2=0
fans always off
during dripping (dd)
and post-dripping (fd)
Fig. 4.9.2
Warning: for correct operation the post-dripping phase must be preceded by the dripping phase for a time greater than zero
(dd>0).
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4.10 H = other settings
alarm parameters
serial
address
H0
H1 special configurations: mod. S – enable defrost
model with alarm relay –relay activation state
H2
H4
H5
t
type min
C
0
C
0
disable keypad (0=no, 1=yes)
enable buzzer 0 = enabled
identification code set only by serial
external parameters (optional modules)
C
C
C
F
0
0
-99
-127
max
199
1
uom
flag
def
1
1
1
1
99
127
flag
1
flag
1
byte
10
byte
Tab. 4.10.1
H0: serial address
Assigns the instrument an address which it responds to when connected to a supervisory or telemaintenance system.
Def.: H0 = 1. Available on all models.
Warning: H0 = 0 is reserved.
H1: special configurations
This parameter defines special functions which vary according to the model.
PJ32S (codes PJ32S0E*, S6E* and PJ32S0P*) can operate as simple thermostats (H1=0) or as thermostats and defrost controls
for static units at normal temperature (defrost on compressor stop, H1=1).
This function can be used only for version S with one probe, in that the models which allow the connection of the product probe
are programmed as Y models, and for these units defrost is always available.
Def.: H1=1, operation with defrost.
PJ32 with alarm relay
H1 sets the operating logic for the alarm relay. If set to zero (0) the relay is energised when the alarm is active, if set to one (1)
the relay is de-energised in the event of an alarm. The only model which currently features the alarm relay is the PJ32S20*.
Def.: H1=1, relay not energised in the event of an alarm.
Warning: the S models with alarm relay (cod. PJ**S2*) are programmed so as to be able to set the alarm output logic. The
programming is thus as for X type instruments, with all the corresponding parameters. The defrost function is thus not set using
H1, but rather using the parameters corresponding to the defrost.
H2: disable keypad
Parameter H2 can be used to disable the modification of the set point and the other operating parameters when the instrument is
located in areas which are accessible to the public.
With the keypad disabled, (H2 = 0) the set point and type F parameters can not be modified. Their value can however be
displayed. Type C parameters, which are password protected, can also be modified following the procedure described below.
Modification of parameter PS is always allowed. Furthermore, the normal functions of the buttons are also blocked: start
continuous cycle and defrost.
Def.: H2=1
H4: disable buzzer
Disables the operation of the buzzer.
Def.: H4 = 0 buzzer enabled. Available on PJ32S and X.
H5: identification code
Assigns the instrument an identification code that can be useful in identifying the various set-ups of the parameters used for
different models of machines. The value is display-only; it can be set using the serial connection (with the key or a supervisory
system).
A positive value should be set (from 1 to 99), if any parameter, including the set point, is modified using the keypad, the value
set becomes negative (with the same value); in this way any modifications to the parameters from the initial set-up can be
checked. Using the programming key, the minus sign - can be cancelled.
Def.: H5 = __ (value depending on the model). Available on all models. Always visible at level F.
Warning: the values from 0 to 31 are used by CAREL to identify the basic models.
t: parameter for expansion modules
Displays and modifies the parameters present on the optional RS485 serial modules and HACCP module.
The operating mode is described in the manuals for the optional modules.
Available on all models.
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5. OPERATING STATES
The indication LEDs can have 3 states:
• off, when the function indicated or the actuator in question is not in operation;
• on, when the function indicated or the actuator in question is in operation;
• flashing, when the operation is blocked by an alarm event, by a delay pending or by a specific status of the multifunction
input.
There are however special machine conditions in which the status of the signal LEDs are not immediately recognisable. For
convenience we have shown as follows the states of the LEDs in these operating modes.
special states
interval of defrost / normal
operation
defrost request / stand-by
defrost in progress
dripping
post dripping
comp LED
def LED
↔
off
↔
↔
flashing
on
off
Off
off
↔
compressor request (stand-by)
flashing
continuous cycle (stand-by)
flashing
continuous cycle (running)
flashing in 2 cycles (*)
↔
↔
↔
Tab. 5.1
The symbol ↔ indicates that the LED can be either on, off or flashing, according to the other parameters and environmental
conditions (temperature, set point, differential, etc.). The general description on the status of the LEDs, provided above, is thus
valid.
The alarm LED is on only during an alarm, and goes off automatically if the alarm is auto-reset or following a reset from the
keypad, if the alarm is no longer present. Also see Tab. 7.1.1.
(*) the continuous cycle signal is shown on the compressor LED by a special sequence: two flashes and a long period with the
LED ON.
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6. PARAMETERS - MODIFICATION
The instruments in the PJ32 series are managed by a microprocessor which allows the operation of the control to be adjusted to
effective needs. For this purpose, there are special operating parameters. These parameters have been grouped into two families:
• frequent parameters (hereafter indicated as type F);
• configuration parameters (type C), whose selection is protected by a code, called the password, to prevent unwanted tampering.
Each parameter can be defined as a frequent parameter or a configuration parameter by setting it using the serial connection or
the programming key.
The parameters can be modified from the front keypad and, where the necessary options are featured, using the serial
connection. To modify the parameters from the front keypad, proceed as follows.
6.1 Modifying the set point and differential
The instrument has a set point of 4ºC. This can be modified as follows:
1.
2.
press the
button for a second to display the value of the set point;
after an instant, the previously set value starts to flash;
3.
increase or decrease the value of the set point using the
4.
press
and/or
buttons until the required value is displayed;
again to confirm the new value.
Setting the differential (control hysteresis - parameter rd).
The instrument is pre-programmed with a differential of 2 degrees. This can be modified as follows:
1.
2.
button for more than 5 seconds (*);
press the
the display shows the code of the first modifiable parameter (PS);
3.
press the
4.
press
5.
increase or decrease the value using the
6.
press
7.
press the
button or the
button until the code rd is displayed;
to display the associated value;
and/or
buttons until the required value is displayed;
again to temporarily confirm the new value and move to the display of the parameter code;
button for 5 seconds to save the new value and exit the modify parameters procedure.
(*) during an alarm the
button must be pressed briefly to silence the signal (relay or buzzer) before being able to access the
modify parameters procedure.
Warning: the parameter rd is normally visible at level F, if not, enter the password (to access the type C parameters).
6.2 Accessing the parameters
To access the type F parameters
1.
2.
press the
button for more than 5 seconds (see (*) on previous page);
the display shows the code of the first modifiable parameter (PS);
3.
use the
and/or
buttons to scroll all the type F parameters.
To access the type C parameters
1. access the type F parameters, select parameter PS (password) using the
2. the display shows 00;
or
button;
button until 22 is displayed (password);
3.
press the
4.
5.
confirm using ;
the display shows the code of the first modifiable parameter (all F and C parameters are visible).
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plug-in
6.3 Modifying the parameters
After having displayed the first parameter, either type C or type F, proceed as follows:
1.
press
or
to reach the parameter which needs to be modified;
2.
press
3.
increase or decrease the value using the
4.
press
5.
press
to display the associated value;
or
buttons, until the required value is displayed;
to temporarily save the new value and return to the display of the parameter code;
or
again to reach the next parameter which needs to be modified; repeat the operation from point 2.
6.4 Saving the new values assigned to the parameters and exiting
Press the
button for 5 seconds to definitively save the new values.
IMPORTANT WARNING: only pressing the
button for 5 seconds moves from the temporary to the definitive saving of
, all the modifications made and
the modifications. Therefore, if power is disconnected from the instrument before pressing
temporarily saved will be lost.
6.5 Exiting the procedure without modifying the parameters
1.
do not press any button for at least 60 seconds (exit by TIME OUT). In this way, the instrument returns to normal operation
without saving any of the modifications to the parameters.
2.
select the parameter PS, enter using
again.
and when the value displayed is 00 press
6.6 Parameters – summary table
PA
/
/C
/2
/4
/5
r
rd
r1
r2
r3
r4
c
c0
c1
c2
c3
c4
cc
c6
parameters
password
probe parameters
ambient probe calibration (x10 value in tenths)
measurement stability
display first/second probe (0=first=ambient)
°C /°F (0=°C, 1=°F)
control parameters
control differential (hysteresis)
minimum set allowed to the user
maximum set allowed
enable alarm Ed (0=no,1=yes)
automatic variation of the set point in night-time operation (that is when the
curtain switch is closed, when A4=4)
compressor parameters
compressor start delay at instrument on
minimum time between 2 successive starts of the compressor
minimum compressor off time
minimum compressor on time
safety relay (0=OFF, 100=ON). See Duty setting
continuous cycle duration
alarm bypass time after continuous cycle
type
F
min
00
max
+199
uom
-
def
22
F
C
C
C
-127
1
0
0
+127
15
1
1
°C/°F
flag
flag
0
4
0
0
F
0
+19
°C/°F
2
C
C
C
C
-50
r1
0
-20
r2
127
1
+20
°C/°F
°C/°F
flag
°C/°F
-50
60
0
3.0
C
C
C
C
C
C
C
0
0
0
0
0
0
0
15
15
15
15
100
15
15
min
min
min
min
min
hours
hours
0
0
0
0
0
4
2
notes
0=0,5
°C/°F
Tab. 6.6.1
follows
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plug-in
continued
d
d0
dI
dt
dP
d4
d5
d6
dd
d8
d9
d/
dC
A
A0
AL
AH
Ad
A4
A7
F
F0
F1
F2
F3
Fd
H
H0
H1
H2
H4
H5
t
defrost parameters
type of defrost (0= heating element,1= hot gas,
2= water or element by time, 3= hot gas by time)
interval between two defrosts
end defrost temperature
maximum defrost duration or effective duration when d0=2 or 3
defrost at instrument on (0=no, 1=yes)
defrost delay when the unit is turned on or from digital input (A4 or A5 =4)
display off during defrost (0=no, 1=yes)
dripping time after defrost
alarm bypass time after defrost
priority of defrost over compressor protection (0=no, 1=yes)
display defrost probe temperature
time basis (0=hours/min, 1=min/s)
alarm parameters
alarm and fan differential
low temperature alarm (indicates the maximum variation allowed in respect to the
set point). If set = 0 excludes the low temperature alarm
high temperature alarm (indicates the maximum variation allowed in respect to the
set point). If set = 0 excludes the high temperature alarm
temperature alarm delay
digital input configuration
detection time delay for the alarm input (A4 = 1)
fan parameters
fan management: 0 = fans always on except specific phases (see parameters F2,
F3, and Fd); 1=fans controlled according to the temperature of the evaporator and
excluding the phases F2, F3, Fd.
fan on temperature: if F0=1;
F1 is the fan ON set point (evapor. T < set point(F1))
fans off with compressor off (0=no, 1=yes).
fans off in defrost (0=no, 1=yes).
off in post dripping.
other settings
serial address
PJ32S 0=T op.; 1=S op. with defrost
PJ32C selection of alarm relay operation
0=alarm normally not energised, 1=alarm normally energised
0=buttons disabled;
only PJ32S 0=buzzer enabled 1=buzzer disabled
identification code (or model number)
external parameter (used only for the external options)
C
0
3
flag
0
F
F
F
C
C
C
F
F
C
F
C
0
-50
1
0
0
0
0
0
0
0
199
+127
199
1
199
1
15
15
1
1
hours
°C/°F
min
flag
min
flag
min
hours
flag
°C/°F
flag
8
4
30
0
0
1
2
1
0
0
C
F
0
0
+19
+127
°C/°F
°C/°F
0
0
F
0
+127
°C/°F
0
C
C
C
0
0
0
199
4
199
min
min
0
0
0
C
0
1
flag
0
F
-50
+127
°C/°F
5
C
C
F
0
0
0
1
1
15
flag
flag
min
1
1
1
C
0
0
199
1
flag
1
1
C
C
F
F
0
0
-99
-127
1
1
+99
+127
flag
flag
1
0
10 (*)
Tab. 6.6.1
(*):parameter H5 can only be set using the serial connection and is always visible at level F.
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-
plug-in
7. ALARMS, TROUBLESHOOTING
7.1 Anomalous or special operating conditions
The instruments in the PJ32 series are able to automatically detect the main malfunctions with the consequent activation of the
following actions:
•
the malfunction is signalled on the display with the corresponding alarm code. In particular, the instrument displays the
alarm code and the temperature read by the probe, alternating. In the case of more than one alarm, these are displayed in
sequence:
•
•
•
button is ON or the graphic symbol (2) appears on the display;
the red LED on the
for some alarms the internal buzzer, if present, sounds;
for the same alarms the alarm relay, if present and configured as an alarm output, is activated.
Pressing the
button silences the buzzer, while the red LED and the alarm relay go off only when the cause of the alarm no
longer exists. The alarm codes are shown in the following table:
alarm code
E0
E1
IA
L0
HI
EE
Ed
dF
buzzer and alarm relay alarm description
models on which present
active
not active
active
active
active
not active
not active
not active
all
all except S and X
all, if the digital input is present
all
all
all
all except PJ32S
all
Tab. 7.1.1
probe control error
defrost probe error
external alarm immediate or delayed by A7
low temperature alarm
high temperature alarm
data error
end defrost for time-out
defrost in progress
7.2 Description of the main signals and alarms
LED flashing
The activation of the corresponding function is delayed by a timer, on stand-by for an external trigger or inhibited by another
procedure in progress. For example, if a continuous cycle is in progress and a defrost is requested, the latter awaits the end of
the continuous cycle and the corresponding LED (defrost) flashes.
E0 on or flashing
control probe error:
• probe not working: the probe signal is interrupted or short-circuited;
• probe not compatible with the instrument;
The alarm signal E0 stays on if there is just one alarm present (the value of temperature is no longer displayed), while it flashes
if other alarms are present or the second probe is displayed.
E1 flashing
evaporator probe or food storage probe error:
• probe not working, the probe signal is interrupted or short-circuited;
• probe not compatible with the instrument;
IA flashing
alarm from multifunction digital input, immediate or delayed:
• check the multifunction input and the parameters A4 and A7.
L0 flashing
low temperature alarm. The probe has read a temperature which is lower than the set by a value greater than parameter AL:
• check the parameters AL, Ad and A0.
The alarm is automatically reset when the temperature returns within the set limits (see parameter AL).
HI flashing
high temperature alarm. The probe has read a temperature which is higher than the set by a value greater than parameter AH.
• check the parameters AH, Ad and A0.
The alarm is automatically reset when the temperature returns within the set limits (see parameter AH).
This alarm can be also be activated by the HACCP module; for a description see the corresponding chapter.
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plug-in
EE shown during operation or when the unit is turned on
error in reading the parameters from the memory. See Data error.
Ed flashing
The last defrost ended after exceeding the maximum duration rather than reaching the end defrost set temperature:
• check parameters dt, dP and d4;
• check the efficiency of the defrost function.
The message will disappear if the next defrost ends at the set temperature.
dF flashing
defrost in progress:
• this is not an alarm signal but rather an indication that the instrument is performing a defrost. It is displayed only if
parameter d6 = 0.
7.3 Data error
In special operating conditions the instrument may detect errors in the internal storage of the data. These errors may
compromise the correct operation of the instrument. If the microprocessor detects a data storage error, display shows the code
EE.
The instrument tries repeatedly to reset the correct operating conditions, and this is indicated by the three dashes --- (reset)
alternating with the code described above.
Warning: if the serial interface to the supervisor (PJOPZ48500) or the HACCP module is connected, one possible cause of this
behaviour may be incorrect wiring or a fault in the interface itself. In this case, disconnect the interface and check if the problem
remains.
If the anomalous situation remains, the control must be replaced. If on the other hand the message disappears, the control can
still be used. When the EE error occurs frequently and/or is hard to resolve, it is recommended to have the control checked, in
that the original accuracy may not be guaranteed.
It is good practice to investigate the cause of this type of error so as to prevent it occurring again. In particular, carefully read
the chapter on INSTALLATION and the paragraph Special and general warnings.
7.3.1 Loading the default parameters
The default values of the parameters can be restored by following the procedure described below:
• disconnect power to the instrument;
•
press and hold the
•
•
the display shows the message - - - followed by CF;
after some seconds the instrument will start working according to the default configuration. Any of the F and C parameters
which differ from the default configuration must be modified.
and
buttons, and reconnect power to the instrument;
IMPORTANT WARNINGS
• the procedure described above resets the instrument and assigns the default parameters. As a result, all modifications made
to the operating parameters will be lost;
• given the delicacy of this operation, the procedure must be performed by specialist personnel. This procedure does not
damage the instrument, but rather resets its original purchase configuration. Therefore, if the operating parameters have
been modified in a disorganised fashion, to the point where the control is unworkable, it can be reset to its original
configuration;
• the setting of level F visibility for the parameters is not modified by the procedure;
• if a programming key is used the reset operation is much simpler, as long as the key contains the required configuration, or it
can be copied from another instrument programmed in the same way. In this case, the visibility flags are updated.
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plug-in
7.4 Troubleshooting
The following table shows other anomalous operating situations which may arise in the various models.
The more frequent causes are indicated and a number of checks are suggested.
problem
the compressor does not start
(signalled by compressor LED
flashing)
the temperature is over the set
limit but there is no alarm
message and the buzzer, if
present, does not sound
the alarm IA is signalled
(multifunction input) without this
actually being active
the alarm connected to the
multifunction input is not
detected
the defrost is not activated
the manual defrost is not
activated and the defrost LED
flashes
the high temperature alarm
appears after a defrost
the display remains off even after
the defrost
after modifying a parameter the
control continues to operate with
the old values
CAUSE
• compressor delay on
• post defrost dripping in progress
checks
check parameters c0, c1 and c2
and dd
alarm delay on
check parameters Ad, c6, d8
the multifunction input generates an alarm when the
contact opens
check the connection of the input
and if it is closed in normal
operation
check if A4=1 check the status of
the digital input
check A7
check parameters dP and dI and
H1 for S models
alarm delay on or parameter setting error
• defrost cycle too short (dP)
• interval between defrost dI=0: in this case the
defrost is not activated
the end defrost temperature is too low or the
evaporator temperature is too high
the compressor protection times are active
the alarm delay after defrost is too short or the alarm
threshold too low
the ambient temperature has not yet reached the set
value or the time d8 has not elapsed
the instrument has not updated the old value or the
parameter programming procedure was not concluded
button for 5
correctly, that is by pressing the
seconds
for the C models, the fans do not 1. a delay in the activation of the compressor and
the fans has been selected
start
2. if F0=1 (fans managed by fan controller)
• the evaporator is <hot>: the evaporator
temperature can be read by selecting the
parameter /d;
• dripping is in progress;
• F1 (fan off temp) too low.
• post dripping delay is on
3. if F0=0
• F2=1 and the compressor is off
• dripping is in progress
• post dripping fan off is in progress
check parameters dt and d/
defrost probe
check parameter d9 (select d9=1,
see WARNINGS)
check parameters d8 and AH
wait or reduce d8
turn the instrument off and on
again or re-program the
parameters correctly
1.
check parameter c0
2.
parameters F0, F1, Fd, dd
and d/
3.
parameters F0, F2, dd and
Fd
Tab. 7.4.1
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plug-in
8. AVAILABLE ACCESSORIES
8.1 Key for copying the parameters
Duplicates the configuration of an instrument (set values of all the parameters and visibility flags), allowing them to be
transferred to other instruments, as long as these have the same hardware configuration (same code).
The key consists of a remote control type box with a connecting cable to the serial port of the instrument, and features an on/off
button and a two-colour signal LED (red/green).
It is powered by a 12Vdc alkaline battery, such as the Philips VR32 or Duracell MN21, or equivalent.
The key must be connected to the instrument when it is off (it doesn’t need to be powered), as the power to the instrument is
supplied by the key itself.
Pressing and holding the activation button transfers the data. The two-colour LED signals the operating status, indicating the
execution and completion of the data transfer and any errors. The maximum duration of the operation is around 12 seconds;
during this period the instrument remains off, after which it starts in normal mode.
During the first 12 seconds the consumption of current is reduced, in that the instrument’s LEDs and display are not turned on
due to their high consumption. The button should not be pressed longer than the time required to complete the operation, so as
not to discharge the battery too quickly.
The possible operations are the following:
1. read the parameters from the connected instrument and save them to the key. This operation is always possible and is
activated by setting the two dip-switches 1,2 to position OFF and pressing the activation button for the necessary time;
2. write the parameters from the key to the connected instrument. This is performed by setting dip-switch 2 to position ON
and dip-switch 1 to OFF, and pressing the activation button. This operation can only be performed if the parameters contained
in the key (model) are compatible with the connected instrument;
3. reset the modify parameters flags (minus sign – for H5). This is performed by setting dip-switch 1 to position ON and dipswitch 2 to OFF, and pressing the activation button. This operation is always possible, and the values of the parameters, apart
from the flag H5, are not modified.
The indications of the two-colour LED are the following:
• on for a brief the red LED turns on at low intensity;
• data transfer the red LED turns on at high intensity; the activation button must not be released during this period;
• operation completed the green LED turns on, the operation is concluded.
• in the event of errors, the red and green LEDs will flash to indicate various causes:
1. instrument disconnected or no response;
2. low power (battery);
3. instrument model not compatible;
4. transfer error;
5. instrument EEPROM error.
For a more compete description of the causes of
these errors, please refer to the key instruction
sheet.
Fig. 8.1.1
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plug-in
8.2 Serial adapter for RS485 network
8.2.1 General characteristics
The optional RS485 serial module allows the plug-in instruments to be connected to the CAREL supervisory network,
providing complete control and monitoring of the operation of the plug-in instruments connected.
The system features the possibility of connecting up to 200 units, with a maximum total connection length of 1000 m.
Connection to the supervisor requires the standard accessories (PC485KIT00), and a termination resistor of 120Ω to be placed
on the terminal block of the last instrument.
In respect to the RS485 serial networks with IR32 instruments, the serial module provides electrical insulation between the
serial network ground and each connected instrument, thus significantly reducing noise problems in larger installations.
Wiring example in the case of serial connection of the instruments:
MAIN
TRF
RS485
RS485 module
terminals
230Vac mains power
3VA 12Vac transformer for PJ32
RS485 serial module for plug-in
1 and 2: 230Vac power; 3: RS485 line (-); 4: RS485 line (+); 5: RS485 ground and shield
Components for serial connection to a
supervisor system:
PC485KIT00: serial adapter from
RS485 to RS232 for connecting to a PC
or CAREL supervisor network, complete
with RS232 serial adapter and mains
power supply.
RS485 serial adapter: serial adapter
with twisted pair and shield for RS485
connection.
The following connections must be respected:
serial adapter shield: connect to adapter
GND and module ;
line 1: connect to adapter Rx+/Tx+ and
module +;
line 2: connect to adapter Rx-/Tx- and
module -.
* At the end of the line, on the last RS485
module, connect the 120 Ω terminal resistor
between terminals + and -.
Fig. 8.2.1
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plug-in
8.2.2 Installation
The mounting of the RS485 serial module uses a standard DIN rail, for wall-mounting an adapter is supplied (DIN rail plate) to
fasten to the wall, onto which module is mounted.
The module-instrument connecting cable is supplied with the module and is 50 cm long; the RS485 module should thus be
located at a distance that is compatible with this connection, which can not be extended.
The electrical connections to be made are the following:
• module instrument connecting cable (50 cm long), connected to the connector on the Top version plug-in instruments;
• 230Vac mains power connections to terminals 1 and 2, as in Figure 8.2.1 (indicated by 230Vac on the module);
and
on the module).
• RS485 serial connection on terminals 3, 4, 5 as in Figure 8.2.1 (indicated by ,
Warning: The serial adapter recommended for the connection is a serial adapter with twisted pair and shield, 0.5A rating, with a
1.5mm² cross-section (e.g. AWG 22-24). The last instrument on the line must be fitted with the 120 Ω terminal resistor.
8.2.3 Setting the operating parameters
The serial module features two operating parameters, for setting the speed of serial transmission and to assign a static address to
the module when the function is enabled. All the parameters can be displayed and modified using the display and the buttons on
the connected plug-in instrument. The parameters can be accessed using parameter t on plug-in instrument. For this operation
parameter H0 on the plug-in instrument must also be set.
8.2.4 Serial adapter parameters
parameters
H0 serial address (plug-in instrument)
tS transmission speed (baud-rate)
t0 local address (static)
type
C
F
F
min
max
uom
def
0
0
0
199
1
127
-
1
0
0
Tab. 8.2.4.1
H0: serial address (plug-in instrument parameter)
The setting of this value defines the address of the instrument in the supervisory network, and is required for the operation of
the adapter when other instruments are connected.
The value 0 is reserved (can not be used); in the supervisory network the connected instruments must all have different
addresses; the allowable values range from 1 to 199.
Def.: 1 Available on all models.
tS: transmission speed
Defines the speed (baudrate) of communication between the adapter module and the supervisor PC. With the parameter set to 1
the speed is 9600 baud, with a value of 0 the speed is 19200 baud. The communication speed must be the same as that defined
in the supervisor program.
Values from 0 to 1 Def.: 0 Available on all models.
t0: local serial address
Defines a local address as an alternative to H0. This parameter allows an independent address to be defined for the connected
instrument. The parameter is visible only if custom-enabled by CAREL (*).
This situation can be useful when the instrument connected to the module is expected to change frequently (e.g. in test
situations).
Def.: 0; values can range from 0 to 127, the value 0 is reserved (can not be used).
(*)Enabling of operation with a local address is performed in the CAREL factory and must be requested at the moment of
ordering.
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plug-in
8.2.4.1 Accessing and modifying type t parameters
The method for displaying and modifying the added parameters present in the options (t parameters) is different from that used
for the standard parameters on the instrument. The main difference is the fact that all the t parameters are scrolled only using the
•
button and not the Up and Down buttons. The procedure is the following:
access the parameters of the expansion module. Select parameter t using the standard operation for the plug-in instrument:
1.
press the
2.
if parameter t is visible at the first level (F parameters), scroll the parameters using the
or
buttons until
parameter t is selected;
if the parameter is not visible at the first level, access the second level (C parameters) by entering the correct password
and then select t, as in point 2.
3.
button for 5 seconds to access the first level parameters;
Warning: for further information, refer to the chapter PARAMETERS - MODIFICATION.
• Transfer from the expansion module, with parameter t displayed, of the complete description of the first parameter
displayed on the instrument (for example, t S for the baud rate):
1.
press the
button to display the value of the parameter;
2.
use the
and
3.
4.
5.
press the
button again to confirm the modified value and exit the display of the value;
the module then brings up the next parameter, and displays its the description (for example, t 0 for the static address);
repeat points 1 2 and 3 to display and if necessary modify the value;
6.
repeatedly scrolls all the parameters which can be displayed; after the last parameter the display starts
pressing the
from the first again.
buttons to modify the value displayed, increasing or decreasing it respectively;
The display of t parameters is exited as follows:
1. by time-out, after 30 seconds inactivity of the buttons;
2.
when displaying the description of a t parameter, pressing the
parameter on the plug-in instrument.
or
button moves to the next or previous
The parameters on the module are saved immediately, and does not require confirmation by pressing the
seconds.
When modifying the value, two segments of the left-most digit
signal that the minimum and maximum values have been
exceeded (segments 1 and 2 in Fig. 8.2.4.1.1). If an out-ofrange value is confirmed, the maximum or minimum value is
saved, according to whether the upper or lower limit has been
exceeded.
1
2
Fig. 8.2.4.1.1
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button for 5
plug-in
8.3 Additional HACCP module
8.3.1 General characteristics
The optional HACCP module expands the control functions of the plug-in family instruments by adding temperature control
with the recording of alarm siutuations due to the exceeding of the maximum temperature threshlolds for significant periods,
which may derive from operating anomalies either in the controlled machines or due to power failures. The added control
functions are designed to help the user monitor the food storage temperature in order to comply with the checking and recording
phases required by the HACCP standards on correct food storage.
As an option a function can be enabled to generate defrost requests programmed at set times.
HACCP alarm management: The control performed by the al HACCP module features the management of two different
events which may be dangerous for correct food storage:
1. HA alarm: if the control temperature is higher than a maximum value for a longer than a set delay time. The threshold
value corresponds to the value set on the plug-in instrument for the high temperature alarm (SET+AH), the delay time
corresponds to the sum of the times set for two parameters: parameter Ad on the plug-in instrument, and parameter tr
on the HACCP module;
2. HF alarm: power failure for an extended period (greater than one minute) with temperature at power resumption
higher than the maximum value (SET+AH).
In both cases an alarm is generated, with a signal on the display of the plug-in instrument and the LED, and alarm relay or
buzzer active if present. Furthermore, the status of the alarm is recorded, and can then be displayed.
8.3.2 Installation
The HACCP module is mounted using a standard DIN rail, for wall-mounting an adapter is supplied (DIN rail plate), to be
fastened to the wall and onto which the module can be mounted.
The module-instrument connecting cable is supplied with the module and is 50 cm long; the HACCP module must thus be
placed at a distance that is compatible with this connection, which can not be extended. The module is also powered directly by
the plug-in instrument using this connection.
8.3.3 Setting the main operating parameters
During installation the main parameters to be checked are listed here below; in particular, please remember that two parameters
determine the enabling or disabling the detection of the HACCP alarms:
AH: Temperature alarm threshold
if set to 0 disables the detection of alarms HA and HF, any pending alarms are not cancelled;
if set to a value > 0 means the alarm threshold is set to the value = SET+AH and the alarm detection is enabled.
tr: HACCP alarm detection delay time
if set to 0 disables the detection of alarms HA and HF (as above);
if set to a value > 0 means the delay time is equal to Ad + tr (Ad is the alarm delay time parameter of the connected plug-in
instrument).
tu, th, t': setting the clock: day of the week, hours and minutes of the internal clock
to: display parameter and reset alarms.
During installation some HACCP alarms will probably have to be cancelled from the start-up of the machines. Setting the value
to 0 resets all the pending HA and HF alarms, including all the variables for recording the status of the alarms.
For a complete description of the parameters, please refer to the paragraph HACCP module parameters.
Cod. +030221881 rel. 1.3 - 03/05/2006
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plug-in
8.3.4 Parameters - description
The HACCP module uses some parameters from the plug-in instrument and its own parameter for the alarm recognition
algorithm, and produces a set of variables for recording the HA and HF events if these occur. It also features parameters for
setting the clock and entering up to eight defrost events at programmed times.
All the parameters can be displayed and modified using the
display and the buttons on the connected plug-in instrument.
The parameters can be accessed using the t parameter on the
plug-in instrument; when displaying the parameters some
segments of the left-most digit are used as indicated in the
figure.
The display and modification procedures are the same indicated
in the paragraph on accessing and modifying the t parameters of
the RS485 serial module.
1
4
2
5
3
Fig. 8.3.4.1
8.3.5 Parameters of the plug-in instrument
parameters
SET control set point
AH high temperature alarm threshold
Ad temperature alarm delay time
type
F
C
min
-50
0
0
max
127
127
199
uom
def
4
°C/°F
0
°C/°F
min.
0
Tab. 8.3.5.1
SET: value of the control set point of the plug-in instrument
This is read directly from the value set on the instrument.
AH: value of the high temperature alarm threshold
This is read directly from the value set on the instrument. Together with the set point it determines the value of the temperature
threshold for the detection of alarms HA and HF (respectively high temperature and power failure alarms).
Threshold = SET+AH.
Warning: AH = 0 disables the detection of the alarms.
Ad: Value of the temperature alarm detection delay
This is read directly from the value set on the instrument. It is used together with parameter tr in the HACCP module to
determine the value of the delay in recognising the HA alarm event.
8.3.6 HACCP module parameters
left segment
code
tu
th
t’
tr
to
t1-8
t1-8
t1-8
parameter description
day of the week of the internal clock
hour of the internal clock
minutes of the internal clock
HA alarm delay
global reset of alarms HA and HF
defrost day of the week
defrost hours
defrost minutes
min
1
0
0
0
0
0
0
0
max
7
23
59
127
1
10
23
59
uom
def
1
hours
0
min
0
min
0
0
0
hours
0
min
0
Tab. 8.3.6.1
tu: day of the week of the internal clock
Displays/Sets the day of the week for the clock. The possible values are from 1 to 7, corresponding to Monday, ..., Sunday in
order.
th: hours of the internal clock
Displays/Sets the current hours for the clock. Values from 0 to 23.
t': minutes of the internal clock
Displays/Sets the minutes for the clock. Values from 0 to 59.
The setting of the internal clock is important for the correct recording of the HA and HF alarms, the times of which are also
recorded.
Cod. +030221881 rel. 1.3 - 03/05/2006
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plug-in
tr: added HA alarm delay
This parameter is saved in the HACCP module and is different from the alarm detection delay (parameter Ad) of the plug-in
instrument. The HA alarm detection delay is the sum of the two tr + Ad.
Warning: if tr = 0 the detection of the HA and HF alarms is disabled.
Def.: 0 null delay and HACCP functions disabled
to: global reset of alarms HA and HF
This parameter has two functions:
• display of the status of alarms HA and HF (1 = alarm present);
• reset the alarms if set to zero.
The parameter is displayed only if there are alarms present, otherwise it is not displayed, nor are all the parameters for recording
the status of the alarms (see below).
The reset function sets all the parameters for recording the status of alarms HA and HF to zero.
t1 - t 8 parameters to set the request for programmed defrost
These parameters are used to define eight defrost events, set by time (day, hour, minute). At the set times the HACCP module
sends a defrost request to the connected plug-in instrument. These parameters are normally not displayed, in that they refer to
distinct operations in respect to the effective HACCP functions. They can be displayed and modified only after having entered
the correct "password" (parameter PS) before accessing the t parameters.
To set the values, there are three parameters for each of the eight events t1,... t8:
• the parameter for the day is indicated by a segment (1 in Fig. 8.3.4.1) which appears together with the number of the event
(t1,...t8) and is indicated by t1,... t8
• the parameter for the hours is indicated by a segment (2 in Fig. 8.3.4.1) and is indicated by
t 1,... t8
• the parameter for the minutes is indicated by a segment (3 in Fig. 8.3.4.1) and is indicated by
t1,... t8
t1,... t8: defrost event day
This parameter defines the day of the week that the defrost is performed for one the eight possible events, a single day or group
of days can be selected. The parameter can have the following values:
value
0
1, ...., 7
8
9
10
description
null event; in this case the two parameters associated to the hours and minutes are not
displayed
selection of a single day Monday,... Sunday
selection of weekdays: from Monday to Friday
selection of weekends: Saturday and Sunday
all days
Tab. 8.3.6.2
t1,... t8: defrost event hour
This parameter defines the hour at which the defrost is performed, the possible values are from 0 to 23.
t1,... t8: of defrost event minute
This parameter defines the minute at which the defrost is performed, the possible values are from 0 to 59.
Cod. +030221881 rel. 1.3 - 03/05/2006
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plug-in
8.3.7 Parameters corresponding to the recording of the HA and HF alarms
left
segment
code
tu
th
t’
tA
tt
td
tu
th
t’
tF
tt
tt
td
parameter description
min
day of last HA event
hours of last HA event
minutes of last HA event
number of HA events detected (since reset)
maximum temperature value during HA alarm
maximum duration of the HA events
day of last HF event
hours of last HF event
minutes of last HF event
number of HF events detected (since reset)
maximum temperature value for HF alarm upon resumption of power
maximum temperature value for HF alarm before power failure
maximum duration of the HF event
1
0
0
0
-50
0
1
0
0
0
-50
0
0
max
7
23
59
127
127
18
7
23
59
127
127
127
18
uom
def
hours
min
0
-50
°C/°F
hours
0
hours
min
0
-50
°C/°F
0
hours
0
Tab. 8.3.6.1
The parameters for recording the status provide a detailed description of the HA and HF alarms which have occurred since the
last reset. All the parameters are display-only, they are divided into two distinct groups for HA alarms and HF alarms, and are
displayed only if the relative alarm HA or HF is effectively present. The parameters are identified using the name associated to
a segment of the left-most digit, for the HA alarms and for the HF alarms (see figure). The order of display of the
parameters is listed in the table.
In the case of more than one event saved, the recording is of the time of the last event only, the total number of HA or HF
events, the maximum temperature measured during the HA and HF alarms and of the relative maximum durations.
8.3.8 Operating mode and alarm signals
When the detection of the alarms has been enabled by the correct setting of parameters AH and tr, the HACCP module performs
continuous control, at one minute intervals, of the control temperature, and based on this and the other parameters (alarm
threshold and delay times) signals and records the type HA alarms, which regard the exceeding of the set temperature limits for
extended periods longer than the set delay times. The module also controls the temperature on re-starts after power failures,
signalling and recording type HF alarms.
HA alarm: arises when the control temperature is above the maximum set (SET+AH) for longer than the set delay (Ad + tr).
The parameter Ad sets the alarm delay of the plug-in instrument, on exceeding this time an alarm signal (high temperature) is
activated, generated by the instrument itself; this signal can be used as a pre-alarm for the subsequent signal that the total time
has been exceeded (Ad + tr), which determines the actual HA alarm. The two parameters allow a maximum duration of 326
minutes to be set.
Any alarm event involving the control probe of the plug-in instrument (E0) is considered equivalent to the temperature being
greater than the threshold, and thus also determines a HA alarm signal after the set delay time.
When the HA alarm is detected the following information, regarding the status parameters, is recorded:
• maximum temperature reached during the alarm (above SET+AH);
• time the alarm event started;
• duration of the alarm; when the alarm is in progress, the current duration is measured;
• number of events (HA) detected.
In the case of a series of alarm events, the information on the alarm is updated:
• the temperature involves the highest value of all the events recorded;
• the time refers to the last event;
• the duration is the longest of all the events recorded;
• the number of events is increased by 1.
HF alarm: Occurs when, after a power failure for an extended period (more than one minute), the control temperature upon
resumption of power is above the set maximum (SET+AH).
The detection if this alarm is enabled as for the HA alarm: AH > 0 and tr > 0. The delay times in this case are not considered, as
the detection of the alarm is instantaneous if the power failure lasts longer than Ad, and Ad + tr also gives the HA alarm signal.
Cod. +030221881 rel. 1.3 - 03/05/2006
42
plug-in
When the HF alarm is detected the following information, regarding the status parameters, is recorded:
• temperature before the power failure;
• duration of the power failure ;
• time the power failure is detected (instant the power resumes );
• temperature reached on resumption of power;
• number of events (HF) detected.
In the case of a series of alarm (HF) events, the information on the alarm is updated:
• both temperatures involve the highest value of all the events recorded;
• the time refers to the last event;
• the duration is the longest of all the events recorded;
• the number of events is increased by 1.
Alarm signals: the detection of one of the two alarm events, HA or HF, is signalled using the LED display of the plug-in
instrument, and by activating any alarm devices available on the instrument: alarm LED, buzzer if featured, alarm relay if
featured.
HA alarm: the display LED
shows the HI alarm code flashing
alternately with the temperature value, the alarm LED
is on and
the upper segment
of the left-most digit is on.
If present the buzzer and the alarm relay are also activated.
1
2
3
Fig. 8.3.8.1
shows the HI alarm code flashing
HF alarm: the display LED
alternately with the temperature value, the alarm LED
is on and
the lower segment
of the left-most digit is on.
If present the buzzer and the alarm relay are also activated.
5
2
3
8.3.9 Cancelling the alarms
In the event of the HA or HF alarm signal, the signals can be reset,
both the signals and the recording of the status can be cancelled
completely:
•
•
Fig. 8.3.8.2
button for 2 seconds to turn off LED , silence the buzzer and deactivate the alarm relay, if present. The
press the
display still shows the HA or HF alarm status (segments and in the figure) and the alarm code;
use the parameter to to completely cancel the pending alarms, signals and status recording variables.
Warning: resetting the signals or the entire status of alarm cancels the signals requested by the HACCP module; if other alarms
detected by the plug-in instrument are present, some signals may remain active.
Cod. +030221881 rel. 1.3 - 03/05/2006
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plug-in
9. TECHNICAL SPECIFICATIONS
models
POWER SUPPLY
very low voltage
12Vac ±10%, 50/60Hz / 12Vdc (11 to 16Vdc)
low voltage
230Vac/Vdc, +10/-15%, 50/60Hz
115Vac/Vdc, +10/-15%, 50/60Hz
rated power (VA)
accuracy (with reference to the type of probes)
CAREL NTC (°C)
PTC (°C)
type of control probe
CAREL NTC (10 K at 25°C)
PTC (985 Ω at 25ºC)
type of defrost probe
CAREL NTC (10 K at 25°C)
PTC (985 Ω at 25 ºC)
control range:-50 to 90 °C (-50 to 127 °F)
operating conditions: -10 to 50 °C, <80% RH
storage conditions:-20 to 70 °C, <80% RH
USER INTERFACE
2 and ½ digit LED display
buzzer signal to indicate:
compressor ON (*)
defrost ON
continuous cycle ON
alarm event
special functions
duty setting
continuous cycle
Multifunction input
Multifunction output for alarm relay
serial connection
keypad protection
programming
PJ32S
PJ32X
PJ32Y
PJ32C
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
3
±1
±3
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Top/Eco
Top
Top/Eco
Top
•
•
•
•
•
•
MECHANICAL SPECIFICATIONS
dimensions (mm): 36x81x65
clip-on fastening using bracket
fastening from front panel using screws
type of environmental pollution: normal
ELECTRICAL SPECIFICATIONS
relay outputs: action type 1C
index of protection IP54 for panel mounting
connections: screw terminals for cables with min 0.5 mm2 and max 1.5 mm2
cross-section, and up to 2.5 mm2 for crimping terminals
UL approval classification: 250Vac 12/8/5A res. 5/2/1FLA 30/12/6LRA
EN60730-1 classification: 12(2)/6(2)/5(1) AT 250Vac
QUALITY AND ACCURACY
watch dog (self-checking of internal functions)
•
Top/Eco Top/Eco Top/Eco
Top
Top
Top
Top/Eco Top/Eco Top/Eco
Top
Top
Top
•
•
•
•
Top
•
•
•
•
•
•
Top
•
•
•
Top
•
•
•
Top
•
•
•
•
Top
•
•
•
Top
•
•
•
Top
•
•
•
Top
•
•
•
Top
•
•
Top
•
•
Top
•
•
Top
•
•
•
•
Tab. 9.1
(*): only the Top versions feature the LED signals behind the buttons, the other (Eco) versions feature only the compressor ON
signal using the decimal point of the right-most digit.
Cod. +030221881 rel. 1.3 - 03/05/2006
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plug-in
9.1 Table summarising the characteristics of the relays used
ELECTRICAL SPECIFICATIONS OF THE
RELAYS PRESENT ON THE VARIOUS
MODELS
maximum peak current
maximum commutable resistive current
maximum commutable power (250Vac)
maximum inductive load at 250Vac
maximum commutable voltage
VDE0435 classification
VDE0461 classification
UL classification (*)
(UL approval of the instrument)
instrument classification as per EN60730-1
max current
16A resistive
max current
8A resistive
30A
12A
12A
8A
3000VA
2000VA
4 A (cos ϕ=0.7)
2A (cos ϕ=0.8)
250Vac
250Vac
16(2) AT 250Vac
8(2) AT 250Vac
12(2) AT 250Vac
6(4) AT 250Vac
250Vac 12A res.
250Vac 8A res.
5FLA 30LRA
2FLA 12LRA
12(2) AT 250Vac
6(2) AT 250Vac
or 10 (4)A only NO or 8 (3)A only NO
max current
5A resistive
6A
5A
1250VA
2A
250Vac
5(2) AT 250Vac
250Vac 5A res.
1FLA 6LRA
5(1) AT 250Vac
max current
16 A resistive
2 HP
72A
16A
4000VA
12A (cos ϕ=0,7)
250Vac
16A 250Vac
12(12)A 250Vac
250Vac 12A res.
12 FLA 72LRA
10(10)A 250Vac
Tab. 9.1.1
(*) Minimum T OFF between two following motor load starting is 60 seconds or more.
9.2 Temperature/resistance values for the NTC thermistors
The temperature probes with NTC thermistors, normally used on the PJ32 controls, feature electrical resistance which changes
according to changes in temperature. Below are the resistance values corresponding to various temperatures.
Table 9.2.2 lists 3 resistance values for each temperature:
• Rstd is the typical resistance value at the indicated temperature;
• Rmin is the minimum value;
• RMAX is the maximum value.
In order to be able to check probe operation, the table shows values corresponding to a number of temperatures.
Table of temperature/resistance values for the CAREL NTC temperature probe. Nominal value: 10 kΩ at 25°C.
temperature (ºC)
-40
0
20
50
Rmin (kΩ)
181.10
26.74
11.95
4.08
Rstd (kΩ)
188.40
27.28
12.09
4.16
RMAX (kΩ)
195.90
27.83
12.23
4.24
Tab. 9.2.2
For the PJ32 controllers featuring PTC probe input, refer to the table of temperature/resistance values for the CAREL PTC
temperature probe.
NOMINAL VALUE: 990Ω at 25 ºC
temperature (ºC)
-40
0
20
50
Rmin (Ω)
545
792
944
1178
Cod. +030221881 rel. 1.3 - 03/05/2006
Rstd (Ω)
562
807
952
1196
Rmax (Ω)
578
820
962
1213
Tab. 9.2.3
45
plug-in
10. DIMENSIONS
Fig. 10.1
dimensions (mm)
A
B
C
D
fixed screw terminals
81
36
68
65
CAREL reserves the right to modify or change its products without prior notice.
Cod. +030221881 rel. 1.3 - 03/05/2006
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removable terminals
81
36
78
65
Tab. 10.1
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CAREL S.p.A.
Via dell’Industria, 11 - 35020 Brugine - Padova (Italy)
Tel. (+39) 049.9716611 Fax (+39) 049.9716600
http://www.carel.com - e-mail: carel@carel.com
Cod: +030221881 rel. 1.3 - 03/05/2006
Agency: