PCT-3000 plus DIGITAL PRESSURE CONTROLLER FOR COOLING PLANTS

Transcription

1 PCT plus DIGITAL PRESSURE CONTROLLER FOR COOLING PLANTS Ver. DESCRIPTION The PCT plus is a pressure controller for refrigeration plants that require control in their suction and discharge stages. With up to four internal pressure switches, it allows controlling the following types of installations: suction and discharge 2 suction and discharge suctions and discharge 2 suctions and 2 independent discharges The PCT plus has 26 digital outputs (relay), 4 analogue outputs ( ~ Vdc), 5 digital inputs (dry contact), 4 pressure inputs (4 ~ 2mA) and 6 inputs. The number of outputs for each pressure switch can be freely configured among the 26 digital outputs, while the analogue outputs are unique to each one. The four last digital outputs can be configured to work both as control stage and as alarm output. In addition to the pressure inputs, each internal pressure switch of the PCT plus uses one input. This input can be used for monitoring the of the gas lines and thus for activating low and high alarms. All pressure switches have an internal alarm interlocking in the controller, in addition to a fully configurable reset system. In addition to the four inputs the PCT plus also has two additional inputs. This two additional inputs are associated to the discharge pressure switch and allows monitoring and controlling the fluid's condensation. The five dry contact digital inputs can be used to detect external alarms and to select the day / night setpoint. Each of these inputs can be associated with one or more internal pressure switches of the PCT plus. 2 APPLICATION To be applied in complex refrigeration process control, used in compressor bank(s) (suction) and in the fan bank (discharge). TECHNICAL SPECIFICATIONS Power Supply: ~264Vac (5/6Hz) Control Pressure: to psi / to (using the S6Atransducer) to 5 psi / to 4.4 (using the S65Atransducer) Pressure Resolution: psi /. Control Temperature: 5 a 5 / 5 a 2 Temperature Resolution:. between andand intherestoftherange in all range Maximum current per digital output: 2mA(25Vac) Maximum current per analogue output: ma( to Vdc) Dimensions (W x H x D): 22x4x54mm Controller operating : to 5 Pressure transducer operating : 4 to 25 Temperature transducer operating : 5 to 5 Operating humidity: to % RH (without condensation) Pressure inputs: PRES Pressure in the gas line of pressure switch PRES2 Pressureinthegaslineofpressureswitch2 PRES Pressureinthegaslineofpressureswitch PRES4 Pressureinthegaslineofpressureswitch4 Temperature inputs: TEMP, of the gas line of pressure switch TEM ofthegaslineofpressureswitch2 TEMP ofthegaslineofpressureswitch TEM ofthegaslineofpressureswitch4 TEMP5 oftheliquiddischargeline TEMP6 oftheliquiddischargeline2 Digital inputs: DIG to 5 dry contact digital inputs Control outputs: OUT to 22 digital control outputs (max 2mA/ 25Vac) OUT 2 to 26 digital control outputs or alarm output (max 2mA/25Vac) AN analogue output for pressure switch ( to Vdc, max ma) AN 2 analogue output for pressure switch 2 ( to Vdc, max ma) AN analogue output for pressure switch ( to Vdc, max ma) AN 4 analogue output for pressure switch 4 ( to Vdc, max ma) 4 NOMENCLATURE ADOPTED IN THE MANUAL P Internal pressure switch Internal pressure switch 2 P Internal pressure switch Internal pressure switch 4 PRES Pressure input Pressure input 2 PRES Pressure input PRES 4 Pressure input 4 PCTV2T TEMP Temperature input Temperature input 2 TEMP Temperature input TEMP 4 Temperature input 4 Temperature input 5 TEMP 6 Temperature input 6 DIG Digital input DIG 2 Digital input 2 DIG Digital input DIG 4 Digital input 4 DIG 5 Digital input 5 AN analogue output AN 2 analogue output 2 AN analogue output AN 4 analogue output 4 GP Pressure switches group G Pressure switches group 2 5 PARTS IDENTIFICATION Ouputs Leds LCD Display Connection terminals S Suction S2 Suction 2 S Suction Suc Suction Suc2 Suction 2 Suc Suction D Discharge D2 Discharge 2 Desc Discharge Desc2 Discharge 2 OUT Digital output (that can be to 26) Display Leds keyboard Activate the main temporary display Exit the secondary display (quick press) Reset the secondary display value (long press) Confirm / advance Secondary alarm display Next pressure switch Cancel / back Secondary hourmeter display Previous pressure switch Increment value Secondary minimum and maximum display Next item Decrement value Secondary general information display Previous item 6 OPERATING MODES 6. Description PCT plus can be configured to operate in four different ways. Each option is called as Operating Mode. The operating modes establish how many internal pressure switches the controller must operate, as well as which pressure inputs and inputs must be used. Depending on the operation mode, the interlocking of pressure switch alarms will change according to the groups formed by different pressure switches (alarm interlocking occurs only between same group pressure switches). The available operating modes are: One suction and : In this mode the controller will have two internal pressure switches, being one to control the compressors (suction) and another one to control the fans (discharge). The suction pressure switch uses one sensor from to psi to measure the pressure in the gas line together with an optional sensor. The discharge pressure switch uses one sensor from to 5 psi to measure the pressure in the gas line together with an optional. The discharge pressure switch has an additional option for using a second to control the condensation of the refrigerant fluid. Two suctions and : In this mode the controller will have three internal pressure switches, being two to control the compressors (suction and suction 2) and another one to control the fans (discharge). Each suction pressure switch uses one sensor from to psi to measure the pressure in the gas line together with an optional sensor. The discharge pressure switch uses one sensor from to 5 psi to measure the pressure in the gas line together with an optional. The discharge pressure switch has an additional option for using a second to control the condensation of the refrigerant fluid. Three suctions and : n this mode, the controller will have 4 internal switches, of which control the compressors (suction, suction 2 and suction ) and the other controls the fans (discharge). Each suction pressure switch will use a psi sensor to measure the pressure in the gas line, along with an optional. The discharge pressure switch will use a 5 psi sensor to measure the pressure in the gas line, along with an optional. 2

2 The discharge pressure switch also offers the option to use a second to control the condensing of the refrigerant. In this operation mode, suction pressure switches (P, and P) and discharge pressure switch () form a single pressure switch group. Two suctions and two discharges: In this mode, the controller will have 4 internal switches, 2 of which control the compressors (suction and suction 2) and the other 2 control the fans (discharge and discharge 2). Each suction pressure switch will use a psi sensor to measure the pressure in the gas line, along with an optional. Each of the discharge pressure switches will use a 5 psi sensor to measure the pressure in the gas line, along with an optional. Each discharge pressure switch also offers the option to use a second to control the condensing of the refrigerant. In this operation mode, suction pressure switch (P) and discharge pressure switch 2 () form the pressure switch group, while suction pressure suction 2 (P) forms the second pressure switch group along with discharge pressure switch 2 (). 6.2 Type of internal pressure switch depending on the operating mode The table below shows the function each pressure switch to control the refrigeration system. Operating Mode one suction two suction s three suctions s two discharges 6. Pressure switch groups according to operation mode ecause the switches in a cooling system operate in an interrelated manner, their pressure control logic should consider that an alarm situation in one of the switches triggers an equivalent corrective action in all other pressure switches in the same system. As PCT plus is capable of controlling up to 2 different cooling systems, Pressure Switch Groups were created to represent all internal pressure switches that belong to the same cooling system. The table below shows the pressure switch groups that each operation mode will have, noting that interlocking in case of alarm will occur only between same group switches. Operating Mode one suction two suction s three suctions s two discharges P P Group Group Group Group Internal pressure switch P P Suction Suction Suction Suction Discharge Suction Suction Discharge Group Group Grupo Group Group Group Group 2 Group Group Abbreviations and colors of the internal pressure switches depending on the operating mode PCT plus uses a color system to quickly identify which internal pressure switch is being viewed. This color system is the same for all operating modes and can be observed in the indicating leds of the display and outputs. Green Internalpressureswitch Yellow Internalpressureswitch2 Violet Internalpressureswitch lue Internalpressureswitch4 esides the indication of colors, PCT plus also uses abbreviations in the display to indicate which internal pressure switch certain information refers to. These abbreviations do not account for the type of pressure switch (suction or discharge) and thus they are the same for all indication modes. The function of the abbreviations shown below is only to indicate the number of the internal pressure switch. P Internal pressure switch Internal pressure switch 2 P Internal pressure switch Internal pressure switch 4 Discharge Suction Suction Internal pressure switch Discharge Discharge For a more complete indication with the type and number of the pressure switch, PCT plus uses the codes presented in the table below.as these abbreviations indicate the type of pressure switch, they are different for each operating mode. Operating Mode one suction three suctions two discharges Operating Mode PRES (psi) ~ ~ ~ ~ Internal pressure switch P P S S S S D S2 S2 D Pressure input (psi) ~5 ~ ~ ~5 D S S2 PRES (psi) ~5 ~ ~ D D2 These are the most used indicators on the controller screen; however, users must be aware that, depending on the operation mode, a particular abbreviation may be associated with different internal pressure switches, for instance: abbreviation S2 in operation mode 2 suctions / discharge refers to internal pressure switch 2 (), whereas in operation mode 2 suctions / 2 discharges, S2 refers to internal pressure switch (P). 6.5 Link of each sensor input to each type of internal pressure switch depending on the operating mode The table below shows how the sensor inputs are linked to the internal pressure switches. For cases where no link exists, the sensor input is not used and thus no connection to a sensor is required. Operating Mode one suction three suctions two discharges Pressure input PRES PRES PRES 4 P P P P P P P PRES 4 (psi) ~5 ~5 TEMP () 5~5 5~5 5~5 5~5 Inlet for gas line Inlet for gas line () 5~5 5~5 5~5 5~5 TEMP () 5~5 5~5 5~5 TEMP 4 () 5~5 5~5 Inlet liquid line TEMP TEMP TEMP 4 TEMP 6 P P P P 6.6 Pressure and reading limits for each sensor input depending on the operating mode The table below shows the measurement limits for the sensors for each sensor input. one suction three suctions two discharges P P P P Inlet liquid line () 5~5 5~5 5~5 TEMP 6 () 5~5 5~5 6.7 Setting the operating mode The operating mode is set through the advanced parameter menu. For more information on this procedure, go to Advanced parameter menu Access code Operating mode setting in this manual. When setting the operating mode, PCT plus will save the default values for all functions in the internal memory. Therefore it is essential to set the operating mode before starting to set the parameters of the product. 4

3 7 CONNECTIONS 7. Pressure sensors The table below shows the pressure sensors that must be used as well as the respective inputs. It is mandatory to use the pressure sensors for each internal pressure switch that. 7. Wiring diagram Full Gauge Controls Operating Mode one suction three suctions two discharges WIRING PANEL Input PRES Input S6A S65A S6A S6A S6A S6A S6A S65A PCT plus Input PRES S65A S6A S6A Input PRES 4 S65A S65A 7.2 Fluid line s The table below shows the s that must be used as well as the respective inputs. Using the fluid line (liquid line) sensor is an optional feature. To enable the use of s, the alarm mode must be enabled for each internal pressure switch Input PRES Input Input PRES Input PRES 4 one suction S S5 Operating Mode S S S5 three suctions two discharges S S S S5 S S5 S S5 A 7.. Operating mode with one suction and SERIAL COMMUNICATION RS45 TEMP PRES G G G GREEN ROWN POWER SUPPLY ~264Vac DIG DIG 2 DIG DIG 4 DIG 5 GND AN AN 2 GND 7. Temperature sensors for the condensation control Thetable belowshows thesensors thatmust beused as well as the respective inputs. Using theliquid line is an optional feature. To enable the use of the liquid line s, the condensation mode must be enabled for each internal discharge pressure switch OUT OUT 2 OUT OUT 4 OUT 5 OUT 6 OUT 7 OUT OUT OUT OUT OUT 2 OUT COMMON OUT OUT 4 OUT 5 OUT 6 OUT 7 OUT OUT OUT 2 OUT 2 OUT 22 OUT 2 / OUT 24 / OUT 25 / OUT 26 / COMMON OUT 426 Input Input TEMP 6 one suction Operating Mode three suctions two discharges S S S S S 7.4 Digital control outputs The 26 digital outputs can be freely associated with the internal pressure switches at the time of setting the operating mode. PCT plus reserves the outputs in increasing order of the internal pressure switches (P,, P and ). For the first pressure switch (P), the outputs are reserved starting from OUT, for the second pressure switch (), starting from the last P output and so on. 7.5 Analogue outputs The four analogue outputs (AN,AN 2,AN andan 4) will always be used with the respective pressure switches (P,, P and ). Thus each pressure switch uses only a single analogue output. The analogue output can control a frequency inverter to change the capacity of a compressor or fan in order to provide a more efficient control of the plant. 7.6 Alarm outputs The four last digital outputs (OUT 2, OUT 24, OUT 25 and OUT 26) can be used as alarm outputs. The configuration of these outputs as alarms is done together with the operating mode setup. If only one alarm is configured, the last output (OUT 26) will be reserved. If two alarms are configured, the two last outputs (OUT 25 and OUT 26) will be used, and so on. TEMP TEMP TEMP 4 TEMP 6 PRES PRES PRES 4 AN AN 2 AN AN 4 DIG ~5 OUT ~26 Temperature sensor S of the gas suction line (Optional) Temperature sensor S5 of the gas discharge line (Optional) Temperature sensor S of the liquid discharge line (Optional) Pressure sensor S6A of the suction Pressure sensor S65A of the discharge Frequency inverter of the suction (Optional) Frequency inverter of the discharge (Optional) Freely configurable among the pressure switches Freely configurable among the pressure switches 7.7 Digital inputs The digital inputs can be used to control the day / night setpoint or to activate external alarms. For the latter, the user can configure the action the input will trigger, as well as which internal pressure switches will be affected. 5 6

4 7..2 Operating mode with and SERIAL COMMUNICATION RS45 A TEMP TEMP PRES PRES G G G G GREEN ROWN DIG DIG 2 DIG DIG 4 DIG 5 GND AN AN 2 AN GND POWER SUPPLY ~264Vac Operating mode with three suctions and two independent discharges SERIAL COMMUNICATION RS45 A TEMP TEMP TEMP 4 TEMP 6 PRES G G G PRES G GREEN ROWN POWER SUPPLY ~264Vac PRES 4 G DIG DIG 2 DIG DIG 4 DIG 5 GND AN AN 2 AN AN 4 GND OUT OUT 2 OUT OUT 4 TEMP TEMP TEMP 4 TEMP 6 PRES PRES PRES 4 AN AN 2 AN AN 4 DIG ~5 OUT ~26 OUT 5 OUT 6 OUT 7 OUT OUT OUT OUT OUT 2 OUT COMMON OUT OUT 4 OUT 5 OUT 6 OUT 7 OUT OUT OUT 2 OUT 2 OUT 22 OUT 2 / OUT 24 / OUT 25 / OUT 26 / COMMON OUT 426 Temperature sensor S of the gas suction line (Optional) Temperature sensor S of the gas suction line 2 (Optional) Temperature sensor S5 of the gas discharge line (Optional) Temperature sensor S of the liquid discharge line (Optional) Pressure sensor S6A of the suction Pressure sensor S6A of the suction 2 Pressure sensor S65A of the discharge Frequency inverter of the suction (Optional) Frequency inverter of the suction 2 (Optional) Frequency inverter of the discharge (Optional) Freely configurable among the pressure switches Freely configurable among the pressure switches OUT OUT 2 OUT OUT 4 OUT 5 OUT 6 OUT 7 OUT OUT OUT OUT OUT 2 OUT COMMON OUT OUT 4 OUT 5 OUT 6 OUT 7 OUT OUT OUT 2 OUT 2 OUT 22 OUT 2 / OUT 24 / OUT 25 / OUT 26 / COMMON OUT 426 TEMP TEMP TEMP 4 TEMP 6 PRES PRES PRES 4 AN AN 2 AN AN 4 DIG ~5 OUT ~26 Temperature sensor S of the gas suction line (Optional) Temperature sensor S5 of the gas discharge line (Optional) Temperature sensor S of the gas suction line 2 (Optional) Temperature sensor S5 of the gas discharge line 2 (Optional) Temperature sensor S of the liquid discharge line (Optional) Temperature sensor S of the liquid discharge line 2 (Optional) Pressure sensor S6A of the suction Pressure sensor S65A of the discharge Pressure sensor S6A of the suction 2 Pressure sensor S65A of the discharge 2 Frequency inverter of the suction (Optional) Frequency inverter of the discharge (Optional) Frequency inverter of the suction 2 (Optional) Frequency inverter of the discharge 2 (Optional) Freely configurable among the pressure switches Freely configurable among the pressure switches 7.. Operating mode with three suctions and SERIAL COMMUNICATION RS45 A OUT OUT 2 TEMP TEMP TEMP 4 TEMP 6 PRES PRES PRES 4 AN AN 2 AN AN 4 OUT DIG ~5 OUT ~26 TEMP OUT 4 OUT 5 TEMP OUT 6 Temperature sensor S of the gas suction line (Optional) Temperature sensor S of the gas suction line 2 (Optional) Temperature sensor S of the gas suction line (Optional) Temperature sensor S5 of the gas discharge line (Optional) Temperature sensor S of the liquid discharge line (Optional) OUT 7 TEMP 4 OUT OUT Pressure sensor S6A of the suction Pressure sensor S6A of the suction 2 Pressure sensor S6A of the suction Pressure sensor S65A of the discharge Frequency inverter of the suction (Optional) Frequency inverter of the suction 2 (Optional) Frequency inverter of the suction (Optional) OUT Frequency inverter of the discharge (Optional) Freely configurable among the pressure switches Freely configurable among the pressure switches PRES OUT OUT 2 OUT PRES COMMON OUT G GREEN ROWN PRES 4 G G G G OUT 4 DIG OUT 5 DIG 2 OUT 6 DIG OUT 7 DIG 4 OUT DIG 5 OUT GND OUT 2 AN OUT 2 AN 2 OUT 22 AN OUT 2 / AN 4 OUT 24 / GND OUT 25 / POWER SUPPLY ~264Vac OUT 26 / COMMON OUT 426 ADVANCED PARAMETER MENU The advanced parameter menu allows configuring the operating settings of the internal pressure switches, as well as the settings of other features of the controller. To enter the advanced parameter menu, press and for 2 seconds until the display changes to the code option. To select an option, just press. To go back use the key. The setting is changed using the and keys. The key confirms the operation and the key cancels it. The available options are: Code 2Pressostats Dig. inputs 4Alarms 5Maintenance 6Config Access code Parameters of the internal pressure switches Parameters of the digital inputs Parameters of the alarm outputs Maintenance of the digital outputs General configuration parameters To set any parameter, just press. If the change is available, the corresponding value will start to flash. The function value can be changed by pressing or. Press again to confirm the new value. To cancel and go back, press. Parameter description Parameter code S Offset Temp # Parameter value Parameter unit The advanced parameter menu will close automatically if no keys are pressed for 5 seconds. 7

5 . Access code Enter 2 in this option to be able to change the advanced parameters. This option also allows entering the code to change the operating mode and the units of measurement for pressure and. Follow the steps below to perform these procedures:.. Operating mode setting Enter the code 77 and confirm with the key. PCT plus will then request you to set the following items: Operating Mode 2 Number of alarm outputs Number of outputs for the pressure switch 4 Number of outputs for the pressure switch 2 5 Number of outputs for the pressure switch (only if the operating mode uses the P) 6 Number of outputs for the pressure switch 4 (only if the operating mode uses the ) 7 Temperaturemeasurement unit Pressure measurement unit Set all items in accordance with the needs of the refrigeration system and confirm the values using the key. Note that during these adjustments you cannot go back using the key and the menu will not terminate automatically if no key is pressed. During the configuration of the operating mode, the leds of the relays are activated in order to show the final association of the internal pressure switches with the respective digital outputs. The user must record the final configuration of the outputs in order to be able to proceed with the right connection of the compressors and fans. Upon changing the operating mode, PCT plus will save the default values for all functions in the internal memory. Therefore it is essential to set the operating mode before starting to set the parameters of the product...2 Setting the units for and pressure Enter the code " 2" and confirm with the key. PCT plus will request the adjustment for the units of and then for the units of pressure. Set both as needed and then confirm using the key. Upon changing the units of measurement, PCT plus will save the default values for all and pressure functions in the internal memory. Therefore it is essential to set the operating mode before starting to set the parameters of the product..2 Parameters of the internal pressure switches In the option "Pressure switches" you can configure the parameters of each PCT plus internal pressure switch individually. To access this menu item, press the key. In the following screen, the controller will show a list containing the available pressure switches to be adjusted. Select the required pressure switch and press to proceed. Within the configuration of each internal pressure switch, PCT plus will make available several types of options, which will vary in accordance with the function of the pressure switch (suction or discharge). The options available for the suction pressure switches are: 2Pressostats 2. Suction The options available for the discharge pressure switches are: 2Pressostats 2.2 Discharge 2.. Parameters 2..2 Estages 2.. Relays mode 2..4 Compres cap 2..5 Cap div 2.2. Parameters Stages 2.2. Relays mode Fans capac Capac div Gas curve.2. Parameters When adjusting the operation of an internal pressure switch, PCT plus makes available the parameters in the display according to the type of pressure switch. Thus there will be two parameter tables, being one for the suction type pressure switches and another one for the discharge type pressure switches. The options available for the suction pressure switches are: Fun P P P5 P6 P7 P P P P P P5 P6 P7 P P P P P2 Description Minimum setpoint threshold Upper setpoint threshold Daytime setpoint Nighttime setpoint Type of control of the digital outputs Digital output hysteresis Type of control of the analogue output of the analogue output Minimum value of the analogue output Power of the analogue output Minimum time of compressor switched on Minimum time of compressor switched off Time between activations Time between deactivations Time for maintenance alarm State of the digital outputs when an error occurs in the pressure sensors State of the analogue output when an error occurs in the pressure sensor Delay for the alarm upon powering on the controller Reset mode Time period for automatic resets Low pressure alarm High pressure alarm of the pressure alarms Temperature sensor mode Low alarm of the alarm Time for liquid collection High Low Critical Gas line pressure offset Gas line offset / / Unit % HP xh % min P Minimum setpoint threshold Lower threshold aimed at preventing an exceedingly low pressure from being adjusted by mistake for daytime and nighttime setpoint. Upper setpoint threshold Upper threshold aimed at preventing an exceedingly high pressure from being adjusted by mistake for daytime and nighttime setpoint. P Daytime setpoint Control pressure when the controller is in daytime mode Nighttime setpoint Control pressure when the controller is in nighttime mode P5 Type of control of the digital outputs Function that selects the type of control of the compressors Off Control switched off Linear Linear activation Rotation Activation by time (rotation) Capacity Activation by capacity P6 Digital output hysteresis It is the relative pressure value defining the pressure range within which the compressors must be activated. The points for which each compressor will be activated depend on the number of outputs and the type of digital control. The minimum hysteresis value is the number of digital outputs configured for the pressure control. P7 Type of control of the analogue output Function that selects the method of control of the analogue output. Off Control switched off On Control switched on Min. Max. Standard Min. Max. Unit Standard % HP xh % min

6 P of the analogue output It is the relative pressure value defining the pressure range within which the analogue output will modulate its value. P Minimum value of the analogue output It is the minimum value that the analogue output will have when activated. This value limits the minimum rotation speed of the compressor. This parameter also adjusts the value that will keep the compressor working when the PCT plus is collecting the liquid if this function is configured. P Power of the analogue output It is the power in HP of the compressor that is operating through the frequency inverter. P Minimum time of compressor switched on It is the minimum time the compressor will remain switched on, that is, the length of time between the last start up and the next stop. It is aimed at avoiding high voltage surges in the power lines. This function is only present in the digital outputs configured as compressor. Minimum time of compressor switched off It is the minimum time the compressor will remain switched off, that is, the length of time between the last stop and the next start up. This function is only present in the digital outputs configured as compressor. P Time between activations This time is for ensuring that no simultaneous compressor activations will occur to avoid overloading power lines. This function is only present in the digital outputs configured as compressor. Time between deactivations This time is for ensuring that no simultaneous compressor deactivations will occur, thus avoiding voltage surges in the power lines. This function is only present in the digital control outputs. This function is only present in the digital outputs configured as compressor. P5 Time for maintenance alarm Time expressed in tens of hours that the compressors can remain working without maintenance. P6 State of the digital outputs when an error occurs in the pressure sensors Configures the state of the compressors when an error occurs in the pressure sensor: All compressors off; All compressors on; 2 Keep the compressors in the same status they were in the moment of the error. P7 State of the analogue output when an error occurs in the pressure sensor Configures the percentage that will be kept in the analogue output if an error occurs in the pressure sensor. P Delay for the alarm upon powering on the controller Time the controller waits after the initialization to activate the alarms and the alarm output (if active). P Reset mode It configures the controller's reset method upon the occurrence of faults / alarms. Manual reset only One automatic reset 2 Two automatic resets Three automatic resets 4 Four automatic resets 5 Five automatic resets 6 Six automatic resets 7 Seven automatic resets Eight automatic resets Nine automatic resets automatic resets Time period for automatic resets This function allows adjusting the time for which automatic resets will be allowed. If all automatic resets have already been performed within the time configured in this function and another fault occurs, the controller will only accept the next reset in manual mode. Low pressure alarm It is the reference pressure value for activating pressure signaling below the desired point. Upon the occurrence of this alarm, all outputs of the suction pressure switch will be switched off. 2 High pressure alarm It is the reference pressure value for activating pressure signaling above the desired point. Upon the occurrence of this alarm, all outputs of the suction pressure switch will be switched on. of the pressure alarms It is the pressure difference for leaving the alarm condition. 4 Temperature sensor mode It shows whether the of the gas line. The alarm and overheating control functions will be available only if this sensor. Off Gas line switched off On Gas line switched on 5 Low alarm It is the reference value for activating the signaling below the desired point. Upon the occurrence of this alarm, all outputs of the suction controller will be deactivated. 6 of the alarm It is the difference for leaving the alarm condition. 7 Time for liquid collection If there is a liquid protection output, the last compressor will remain active for this time when the pressure reaches the setpoint. This function allows for a compressor to keep the refrigerant fluid when the liquid protection output is activated, thus allowing collecting the gas. High The alarm of low suction performance will be activated above this. To deactivate this function, just increment the value until the OFF message is displayed. Low Theliquid protection output (ifany) will beactivated belowthis. Todeactivate this function, just decrement thevalue until theoff message is displayed. P Critical All the suction outputs will be deactivated and the liquid protection output (if any) will be activated below this. To deactivate this function, just decrement the value until the OFF message is displayed. P Gas line pressure offset It allows compensating any deviations in the pressure reading caused by the replacement of the pressure switch sensor. P2 Gas line offset It allows compensating any deviations in the reading caused by the replacement of the pressure switch sensor. The options available for the discharge pressure switches are: Fun P P P5 P6 P7 P P P P P P5 P6 P7 P P P P P2 P P5 P6 Minimum setpoint threshold Upper setpoint threshold Daytime setpoint Nighttime setpoint Type of control of the digital outputs Digital output hysteresis Type of control of the analogue output of the analogue output Minimum value of the analogue output Power of the analogue output Minimum time of fans switched on Minimum time of fans switched off Time between activations Time between deactivations Time for maintenance alarm State of the digital outputs when an error occurs in the pressure sensors State of the analogue output when an error occurs in the pressure sensor Delay for the alarm upon powering on the controller Reset mode Time period for automatic resets Low pressure alarm High pressure alarm of the pressure alarms Temperature sensor mode High alarm of the alarm reeze system mode reeze system setpoint of the breeze system Control mode of condensation Control setpoint of condensation Differential control of condensation Differential control of condensation 2 Gas line pressure offset Gas line offset Liquid line offset / / Description Min. Max. Standard Min. Max. Unit Standard Unit % HP xh % min ,, % HP xh % min

7 P Minimum setpoint threshold Lower threshold aimed at preventing an exceedingly low pressure from being adjusted by mistake for daytime and nighttime setpoint. Upper setpoint threshold Upper threshold aimed at preventing an exceedingly high pressure from being adjusted by mistake for daytime and nighttime setpoint. P Daytime setpoint Control pressure when the controller is in daytime mode. Nighttime setpoint Control pressure when the controller is in nighttime mode. P5 Type of control of the digital outputs Function that selects the type of control of the fans. Off Control switched off Linear Linear activation Rotation Activation by time (rotation) Capacity Activation by capacity P6 Digital output hysteresis It is the relative pressure value defining the pressure range within which the fans must be activated. The points for which each fan will be activated depend on the number of outputs and the type of digital control. The minimum hysteresis value is the number of digital outputs configured for the pressure switch in question. P7 Type of control of the analogue output: Function that selects the method of control of the analogue output. Off Control switched off On Control switched on P of the analogue output It is the relative pressure value defining the pressure range within which the analogue output will modulate its value. P Minimum value of the analogue output It is the minimum value that the analogue output will have when activated. This value limits the minimum rotation speed of the fan. P Power of the analogue output It is the power in HP of the fan that is operating through the frequency inverter. P Minimum time of fan switched on It is the minimum time the fan will remain switched on, that is, the length of time between the last start up and the next stop. It is aimed at avoiding high voltage surges in the power lines. This function is only present in the digital outputs configured as fan. Minimum time of fan switched off It is the minimum time the fan will remain switched off, that is, the length of time between the last stop and the next start up. This function is only present in the digital outputs configured as fan. P Time between activations This time is for ensuring that no simultaneous activations of the discharge stages will occur, to avoid overloading power lines. This function is only present in the digital outputs configured as fan. Time between deactivations This time is for ensuring that no simultaneous deactivations of the discharge stages will occur, thus avoiding voltage surges in the power lines. This function is only present in the digital outputs configured as fan. P5 Time for maintenance alarm Time expressed in tens of hours that the fans can remain working without maintenance. P6 State of the digital outputs when an error occurs in the pressure sensors Configures the state of the fans when an error occurs in the pressure sensor. All fans off; All fans on; 2 Keep the fans in the same status they were in the moment of the error. P7 State of the analogue output when an error occurs in the pressure sensor Configures the percentage that will be kept in the analogue output if an error occurs in the pressure sensor. 7 Seven automatic resets Eight automatic resets Nine automatic resets automatic resets Time period for automatic resets This function allows adjusting the time for which the configured automatic resets will be allowed. If all automatic resets have already been performed within the time configured in this function and another fault occurs, the controller will only accept the next reset in manual mode. Low pressure alarm It is the reference pressure value for activating the pressure signaling below the desired point. Upon the occurrence of this alarm, all outputs of the suction pressure switch will be switched off. 2 High pressure alarm It is the reference pressure value for activating the pressure signaling above the desired point. Upon the occurrence of this alarm, all outputs of the suction pressure switch will be switched on. of the pressure alarms It is the pressure difference for leaving the alarm condition. 4 Temperature sensor mode It shows whether the of the gas line. The alarm and overheating control functions will be available only if this sensor. Off Alarm and switched off On Alarm and switched on 5 High alarm It is the reference value for activating the signaling above the desired point. Upon the occurrence of this alarm, all outputs of the discharge pressure switch will be switched on. 6 of the alarm It is the difference for leaving the alarm condition. 7 reezesystemmode Configurestheoperationofthebreezesystem. Off reeze system control switched off On reeze system control switched on reeze system setpoint When the pressure is above this value, the breeze output will be activated, if this output exists. of the breeze system Pressure difference to switch off the breeze output. P Control mode of condensation Configures to operation of the condensation control (liquid line ). Off Turns off the condensation control. Only output TheSubcool. is activated when the of the sensor of the liquid line reach the value set in "Setpoint of condensation control" + "Differential of the condensation control", and deactivated when it return to the value set in "Setpoint of condensation control". 2 Two independent outputs TheSubcool. is activated when the of the sensor of the liquid line reach the value set in "Setpoint of condensation control" + "Differential of the condensation control". When It reach the value set in "Setpoint of condensation control" + "Differential 2 of the condensation control", it activates thesubcool. 2 output, remaining activated the Subcool.. When the falls below from the "Setpoint of condensation control" + "Differential of the condensation control" thesubcool. 2 output is deactivated, remaining activated thesubcool. output until the of the liquid line stays below of the value set in "Setpoint of condensation control". Two interleaved outputs Activate the Subcool. 2 output when the of the sensor of the liquid line reach the value set in "Setpoint of condensation control" + of the condensation control". When It reach the value set in "Setpoint of condensation control" + " H ysteresis 2 of the condensation control it activates thesubcool. 2 output and thesubcool. output is deactivated. When the falls below from the "Setpoint of condensation control" + of the condensation control", thesubcool. 2 output is deactivated and thesubcool. output back to be activated. The two outputs will be deactivated only when the is below the value set to "Setpoint of condensation control. P Control setpoint of condensation It is the reference value of the liquid line to switch off the control outputs of the condensation. P Delay for the alarm upon powering on the controller P2 and P Differential control of condensation and 2 Time the controller waits after the initialization to activate the alarms and the alarm output (if active). It is the difference measured on liquid line to switch on the control outputs Subcool. and Subcool.2 respectively. Gaslinepressureoffset P Reset mode It allows compensating any deviations in the pressure reading caused by the replacement of the pressure switch sensor. It configures the controller's reset method upon the occurrence of faults / alarms. Manual reset only P5 Gas line offset One automatic reset It allows compensating any deviations in the reading caused by the replacement of the pressure switch sensor. 2 Two automatic resets Three automatic resets P6 Liquid line offset 4 Four automatic resets It allows compensating any deviations in the liquid line reading caused by the replacement of the pressure switch sensor. 5 Five automatic resets 6 Six automatic resets 4

8 .2.2 Stages It allows adjusting the function of each digital output of the internal pressure switch. The options of each output are: Suction pressure switches: Off Digital output off (free); Compressor Digital output to activate the compressor; Unloader Digital output to activate the capacity valve of a compressor. This type of output must be after a "Compressor" output or other "Unloader" output; Liq Collec Digital output to activate a valve for liquid collection. Discharge pressure switches: Off Disabled Digital output off (free); Fan Digital output to activate a fan; Fan aux Digital output to activate an auxiliary fan. This type of output must be after a "Fan" output or other "Fan aux" output; Subcool. Output of the condensation control; Subcool. 2 Output 2ofthecondensationcontrol. Itmustbeaftertheoutput; reeze Output of the breeze system control..2. Modes of the relays It allows adjusting whether the relay of the digital output will operate in the normally open (NO) or normally closed (NC) mode..2.4 Capacity of the compressors (suction) / Capacity of the fans (discharge) It allows adjusting the total power in HP of each compressor or fan..2.5 Capacity Suction pressure switches: It allows adjusting the portion of each capacity valve (Unloader) within the total power of the compressor. Discharge pressure switches: It allows adjusting the portion of each ventilation auxiliary (Fan aux) within the total power of the fan..2.6 Gas curve (only for the discharge pressure switch) It allows adjusting the curve of the gas used in the group of pressure switches. The PCT plus uses this curve to calculate the from the suction pressure of each gas line. Fun C C2 C C4 C5 C6 C7 C C C C C2 C C4 C5 C6 C7 C C C2 Pressure point of the mapped curve Temperature point of the mapped curve Pressure point 2 of the mapped curve Temperature point 2 of the mapped curve Pressure point of the mapped curve Temperature point of the mapped curve Pressure point 4 of the mapped curve Temperature point 4 of the mapped curve Pressure point 5 of the mapped curve Temperature point 5 of the mapped curve Pressure point 6 of the mapped curve Temperature point 6 of the mapped curve Pressure point 7 of the mapped curve Temperature point 7 of the mapped curve Pressure point of the mapped curve Temperature point of the mapped curve Pressure point of the mapped curve Temperature point of the mapped curve Pressure point of the mapped curve Temperature point of the mapped curve / / Description Min. Max. Standard Min. Max. Unit Standard Unit Through the pressure reading on the suction, the controller calculates the ideal of expansion (of evaporation) based in the curve of the gas used in the system. The overheating is the result from the difference between the on the suction and the on the evaporation. The suction parameters enable to adjust the value of "Overheating high ", "Overheating low " and "Overheating critic ", in order to warn the system in cases of low performance and protection of the compressors. The gas curve can be adjusted entering up to points. Each point comprises one pressure value and one value. For example: parameters C and C2 map the first point of the curve, C and C4 map the second point of the curve and so on. Adjusting a parameter for its minimum value will disable the point relating to that parameter Parameters of the digital inputs Fun D D2 D D4 D5 D6 D7 D D D D D2 D D4 D5 Digital input mode State when the contact of the digital input is open Pressure switches associated to the digital input Digital input mode 2 State when the contact of the digital input 2 is open Pressure switches associated to the digital input 2 Digital input mode State when the contact of the digital input is open Pressure switches associated to the digital input Digital input mode 4 State when the contact of the digital input 4 is open Pressure switches associated to the digital input 4 Digital input mode 5 State when the contact of the digital input 5 is open Pressure switches associated to the digital input 5 D Digital input mode It allows adjusting the operating mode of the digital output. Off Input disabled Day/Nigth Selection of the daytime / nighttime setpoint All on Enable all outputs All off Disable all outputs D State when the contact of the digital input is open Deactive Digital input considered disabled Active Digital input considered enabled D Pressure switches associated to the digital input It allows adjusting which pressure switches are linked to the digital input. All All pressure switches P Pressure switch Pressure switch 2 P Pressure switch Pressure switch 4 All GPAll of pressure switch group Suct GP All suctions of pressure switch group All G All of pressure switch group 2 Suct G All suctions of pressure switch group 2.4 Parameters of the alarm outputs / / Description Min. Max. Unit Standard Min. Max. Unit Standard / / Fun Description Min. Max. Unit Standard Min. Max. Unit Standard A A2 A A4 A5 A6 A7 A A A A A2 A A4 A5 A6 A7 A A A2 Alarm mode Pressure switches associated to the alarm Alarm on time Alarm off time Alarm output in reverse mode Alarm 2 mode Pressure switches associated to the alarm 2 Alarm 2 on time Alarm 2 off time Alarm 2 output in reverse mode Alarm mode Pressure switches associated to the alarm Alarm on time Alarm off time Alarm output in reverse mode Alarm 4 mode Pressure switches associated to the alarm 4 Alarm 4 on time Alarm 4 off time Alarm 4 output in reverse mode 5 6

9 A Alarm mode It allows adjusting the operating mode of the alarm output xx. Off Control switched off All All alarms Low press Low pressure alarm Hi press High pressure alarm Pressure All pressure alarms Low temp Low alarm Hi temp High alarm Temperat All alarms Dig In Digital input alarm Locked Controller locked alarm Remote Interlocking alarm Low superh Low alarm Crit Super Critical alarm Low efic Low efficiency alarm (high ) Superheat All alarms Maintenanc Maintenance alarms Pres senso Pressure sensor error alarm Temp senso Temperature sensor error alarm Liq.L sens Error alarm in the liquid line Sensors Error alarm for any sensor A Pressure switches associated to the alarms It allows adjusting which pressure switches the alarm output will be linked to. All All pressure switches P Pressure switch Pressure switch 2 P Pressure switch Pressure switch 4 All GPAll of pressure switch group Suct GP All suctions of pressure switch group All G All of pressure switch group 2 Suct G All suctions of pressure switch group 2 A Alarm on time It is the time the alarm output will be active when cycling. To make the output stay continuously on, just configure this function to zero. A Alarm off time It is the time the alarm output will be deactivated when cycling. To make the output stay continuously on, just configure this function to zero. A Alarm output in reverse mode It indicates whether the relay of alarm will close or open the contact in an alarm condition. No Relay contact open when no alarm is present Relay contact closed when no alarm is present.5 Maintenance of the digital outputs It allows placing any output of the PCT plus in maintenance regardless of its function..6 General configuration parameters / / Fun Description Min. Max. Unit. Standard Min. Max. Unit. Standard G G2 G G4 Preferred indication Contrast Language RS45 address G Preferred indication It allows adjusting the preferred indication in the display. Info Screen with the type of each internal pressure switch Pressure Screen with the pressures of the gas line Temperat Screen with the s of the gas line Liq.L Temp Screen with the liquid line s Dig in Screen with the state of the digital inputs Rotat All the screens above alternating G2 Contrast It allows adjusting the contrast of the display G4 RS45 address AIt adjusts the address of the controller in the RS45 network. Note: One network must not have different instruments with the same address. OPERATION. Pressure control PCT plus pressure control system has an option to control variable capacity compressors and fans by activating digital outputs or using the analogue output. Using the analogue output the compressor is controlled by means of a frequency inverter and the capacity is directly modulatedbythecontroller. Inthecaseofactivating bythedigitaloutputs, thecompressors mustbefittedwithcapacity valves (unloaders) orthe fans must be fitted with auxiliary devices (evaporative system). First we have to establish a nomenclature for the components to understand better the operation of the logic of the variable capacity compressors and fans using the digital outputs. Master stage: It is the output connected directly to the motor of the compressor, i.e. it is the stage that switches the compressor / fan on or off. Slave stage: It is the output connected to the device that changes the capacity of the master stage (unloader or fan auxiliary). One master stage may have slave stages or not. If there are no slaves the compressor / fan will not have variable capacity. If there are slaves, they may be present in any number. One slave stage can only be activated when the master is already active and one master stage can only be deactivated when all its slaves are switched off. Total power in HP: It is the total power of the master stage together with the slave stages expressed in HP, i.e. it is the maximum power that the compressor / fan can exert on the refrigeration system. Portion of the total capacity: It is the portion of power that each stage (master and slave) contributes to the total power in HP. The portions of the capacity are adjusted in percentage (%) levels. Thus the sum of the value of the master and the values of the slaves for a same compressor / fan must be %. The possible combinations in PCT plus pressure control are adjusted by the parameters "Type of control of the digital outputs" and "Type of control of the analogue output". The possible combinations are: Control only by the digital outputs Control only by the analogue output Mixed control by the digital outputs and analogue output Types of control only by the digital outputs Configuring the type of digital control as on and the type of analogue control as off, the pressure control will be performed only by the digital outputs. The possible control methods under these conditions are: Digital outputs in linear mode Digital outputs in rotation mode Digital outputs in capacity mode Digital outputs in linear mode The digital outputs will be used in this control mode, and thus the controller will assume only the hysteresis value configured in the function: "digital output hysteresis". The controller will add digital outputs (master and slaves) as the pressure deviates from the setpoint. The activation point for each output is calculated in accordance with the hysteresis value and the number of stages (master and slave) configured. Example: Setpoint: psi of the digital output: 2 psi Number of master stages: 4 Number of slave stages: 2 Configuration of the stages: OUT Compressor (master ) Unloader (slave of master ) OUT Compressor (master 2) Unloader (slave of master 2) OUT 5 Compressor (master ) OUT 6 Compressor (master 4) Activation step of the digital outputs of the digital output Step = Number of master and slave stages Pressure for activating output "N" Activation = Setpoint + (N x Step) Pressure for deactivating output "N" Activation = Setpoint + (N x Step) In this example the total of digital outputs is 6 (4 master and 2 slave). Thus the step of each digital output is 2 psi (2 psi divided by 6). The first digital stage will be activated when the pressure reaches 2 psi (setpoint plus step), the second at 4 psi (setpoint plus 2 times the step), the third at 6 psi (setpoint plus times the step), and so on. Please note that at 22 psi (setpoint plus digital hysteresis) all digital outputs will be on. G Language It allows adjusting the language of the controller between Portuguese, English and Spanish. 7