Installing and Operating Instructions
Contents
1. for instance when the room is filled with new products e COn Compressor ON time with faulty probe 02255 min time during which the compressor is active in case of faulty thermostat probe With COn 0 compressor is always OFF e COF Compressor OFF time with faulty probe 0255 min time during which the compressor is OFF in case of faulty thermostat probe With COF 0 compressor is always active DISPLAY e CF Temperature measurement unit Celsius F Fahrenheit WARNING When the measurement unit is changed the SET point and the values of the parameters Hy LS US Ot ALU and ALL have to be checked and modified if necessary rES Resolution for C in 1 C dE 0 1 C allows decimal point display Lod Display select which probe is displayed by the instrument P1 Thermostat probe P2 Evaporator probe DEFROST EdF End defrost setting Pb by temperature the second probe is used nP by time the defrost lasts for the MdF time dtE Defrost termination temperature 50 50 C 58 122 F Enabled only when EdF Pb sets the temperature measured by the evaporator probe which causes the end of defrost idF Interval between defrost cycles 0 120h Determines the time interval between the beginning of two defrost cycles MdF Maximum length for defrost 0 255min When P2P n not evaporator probe timed defrost it sets the defrost duration when P2P y defrost end based on temperature it sets the maximum length fo2. key to display its value Now only the LED is blinking 5 Use a or v to change its value 6 Press SET to store the new value and move to the following parameter To exit Press SET or wait 15s without pressing a key NOTE the set value is stored even when the procedure is exited by waiting the time out to expire 6 5 2 HOW TO MOVE A PARAMETER FROM THE HIDDEN MENU TO THE FIRST LEVEL AND VICEVERSA Each parameter present in the HIDDEN MENU can be removed or put into THE FIRST LEVEL user level by pressing SET v In HIDDEN MENU when a parameter is present in First Level the decimal point is on 6 6 HOW TO LOCK THE KEYBOARD 7 1 Keep pressed for more than 3 s the and keys The POF message will be displayed and the keyboard will be locked At this point it will be possible only to see the set point or the MAX o Min temperature stored 3 If akey is pressed more than 3s the POF message will be displayed N 6 7 TO UNLOCK THE KEYBOARD Keep pressed together for more than 3s the a and keys till the Pon message will be displayed 6 8 THE CONTINUOUS CYCLE When defrost is not in progress it can be activated by holding eg the key pressed for about 3 seconds The compressor operates in continuous mode for the time set through the CCt parameter The cycle can be terminated before the end of the set time using the same activation key a for 3 seconds 7 PARAMET
3. 15 switch Compressor status with open no Fan normal oor CPr F_C Compr OFF C Kind of probe ntc Ptc Room probe display _ a Evaporator probe display Po Software release ooo e y A Map code o d m ze o agleiz Z i A N Hidden parameters CE Dixell s r l Z I Via dell Industria 27 32010 Pieve d Alpago BL ITALY tel 39 0437 98 33 fax 39 0437 98 93 13 E mail dixell dixell com http www dixell com 4 4
4. CL the digital input is activated by closing the contact i1F Digital input configuration EAL external alarm EA message is displayed bAL serious alarm CA message is displayed PAL pressure switch alarm CA message is displayed dor door switch function dEF activation of a defrost cycle LHt not enabled Htr kind of action inversion cooling heating did 0 255 min with i1F EAL or i1F bAL digital input alarm delay delay between the detection of the external alarm condition and its signalling with i1F dor door open signalling delay with i1F PAL time for pressure switch function time interval to calculate the number of the pressure switch activation nPS Pressure switch number 0 15 Number of activation of the pressure switch during the did interval before signalling the alarm event I2F PAL If the nPS activation in the did time is reached switch off and on the instrument to restart normal regulation e odc Compressor status when open door no Fan normal CPr F_C Compressor OFF OTHER PbC Type of probe it allows to set the kind of probe used by the instrument PbC PBC probe ntC NTC probe dP1 First probe display dP2 Second probe display rEL Software release for internal use Ptb Parameter table code readable only 8 DIGITAL INPUT The free contact digital input is programmable in five different configurations by the i1F parameter 2 4 Dill Ins
5. Frontal protection IP65 with frontal gasket RG C optional Connections Screw terminal block lt 2 5 mm wiring Power supply according to the model 12Vac dc 10 24Vac dc 10 230Vac 10 50 60Hz 110Vac 10 50 60Hz Power absorption 3VA max Display 3 digits red LED 14 2 mm high Inputs 2 NTC or PTC probes Digital input free contact Relay outputs compressor SPDT relay 8 3 A 250Vac or SPST relay 20 8 A 250Vac Data storing on the non volatile memory EEPROM Kind of action 1B Pollution grade normal Software class A Operating temperature 0 60 C Storage temperature 30 85 C Relative humidity 20 85 no condensing Measuring and regulation range NTC probe 40 110 C 40 230 F PTC probe 50 150 C 58 302 F Resolution 0 1 C or 1 C or 1 F selectable Accuracy ambient temp 25 C 0 7 C 1 digit 3 4 p ll Installing and Operating Instructions 1598007181 14 CONNECTIONS 14 1 XR20C 8A COMPRESSOR 8 8 3 A250V 12Vac dc supply connect to the terminals 7 and 8 24Vac dc supply connect to the terminals 7 and 8 120Vac supply connect to the terminals 7 and 8 14 2 XR20C 20A COMPRESSOR Supply Comp 230V Line 12Vac dc supply connect to the terminals 7 and 8 24Vac dc supply connect to the terminals 7 and 8 120Vac supply connect to the terminals 7 and 8 1598007181 XR20C CRM GB R1 0 25 07 04 do
6. l see address with a detailed description of the fault e Consider the maximum current which can be applied to each relay see Technical Data e Ensure that the wires for probes loads and the power supply are separated and far enough from each other without crossing or intertwining e In case of applications in industrial environments the use of mains filters our mod FT1 in parallel with inductive loads could be useful 2 GENERAL DESCRIPTION Model XR20C 32x74 mm format is a microprocessor based controller suitable for applications on medium or low temperature refrigerating units It has 1 relay output to control compressor It is also provided with two NTC or PTC probe inputs one for temperature control the other to be located onto the evaporator to control the defrost termination temperature The instrument is fully configurable through special parameters that can be easily programmed through the keyboard 3 CONTROLLING LOADS 3 1 COMPRESSOR The regulation is performed according to the temperature measured by the thermostat probe with a positive differential from the set point if the temperature increases and reaches set point plus differential the compressor is started and then turned off when the temperature reaches the set point value again Tempera SET HYP gt lt gt i sas Pal aaron rae Fee l l Compra l A E In case of fault in the thermostat probe the start and stop of th
7. power supply complies with the instrument s requirements Separate the probe cables from the power supply cables from the outputs and the power connections Do not exceed the maximum current allowed on each relay in case of heavier loads use a suitable external relay 10 1 PROBE CONNECTION The probes shall be mounted with the bulb upwards to prevent damages due to casual liquid infiltration It is recommended to place the thermostat probe away from air streams to correctly measure the average room temperature Place the defrost termination probe among the evaporator fins in the coldest place where most ice is formed far from heaters or from the warmest place during defrost to prevent premature defrost termination 11 HOW TO USE THE HOT KEY 11 1 HOW TO PROGRAM A HOT KEY FROM THE INSTRUMENT UPLOAD 1 Program one controller with the front keypad 1598007181 XR20C CRM GB R1 0 25 07 04 doc XR20C 1598007181 2 When the controller is ON insert the Hot key and push a key the uPL message appears followed a by flashing End 3 Push SET key and the End will stop flashing 4 Turn OFF the instrument remove the Hot Key then turn it ON again NOTE the Err message is displayed for failed programming In this case push again a key if you want to restart the upload again or remove the Hot key to abort the operation 11 2 HOW TO PROGRAM AN INSTRUMENT USING A HOT KEY DOWNLOAD 1 Turn OFF th
8. Dill Installing and Operating Instructions Digital controller with defrost management XR20C CONTENTS GENERAL WARNING GENERAL DESCRIPTION CONTROLLING LOADS FRONT PANEL COMMANDS TEMPERATURE ALARM AND ITS DURATION RECORDING HACCP __ MAIN FUNCTIONS PARAMETERS DIGITAL INPUT INSTALLATION AND MOUNTING ELECTRICAL CONNECTIONS HOW TO USE THE HOT KEY 12 ALARM SIGNALS 13 TECHNICAL DATA 14 CONNECTIONS 15 DEFAULT SETTING VALUES 1 GENERAL WARNING ONDU o N oO PFPRWWWHWWNNA HHA A A 1 1 PLEASE READ BEFORE USING THIS MANUAL e This manual is part of the product and should be kept near the instrument for easy and quick reference e The instrument shall not be used for purposes different from those described hereunder It cannot be used as a safety device e Check the application limits before proceeding 1 2 SAFETY PRECAUTIONS e Check the supply voltage is correct before connecting the instrument e Do not expose to water or moisture use the controller only within the operating limits avoiding sudden temperature changes with high atmospheric humidity to prevent formation of condensation e Warning disconnect all electrical connections before any kind of maintenance e Fit the probe where it is not accessible by the End User The instrument must not be opened e In case of failure or faulty operation send the instrument back to the distributor or to Dixell s r
9. ERS NOTE the parameters preceded by dots are in the Hidden Menu REGULATION Hy Differential 0 1 25 5 C 1 255 F Intervention differential for set point Compressor Cut IN is Set Point Plus Differential Hy Compressor Cut OUT is when the temperature reaches the set point e LS Minimum set point 50 C SET 58 SET Sets the minimum acceptable value for the set point e US Maximum set point SET 110 C SET 230 Set the maximum acceptable value for set point Ot Thermostat probe calibration 12 0 12 0 C 120 120 F allows to adjust possible offset of the thermostat probe P2P Evaporator probe presence n not present the defrost stops by time y present the defrost stops by temperature e OE Evaporator probe calibration 12 0 12 0 C 120 120 allows to adjust possible offset of the evaporator probe 1598007181 XR20C CRM GB R1 0 25 07 04 doc XR20C Installing and Operating Instructions 1598007181 e OdS Outputs activation delay at start up 02255min This function is enabled at the initial start up of the instrument and inhibits any output activation for the period of time set in the parameter AC Anti short cycle delay 0 50 min minimum interval between the compressor stop and the following restart e CCt Compressor ON time during continuous cycle 0 0 24 0h res 10min Allows to set the length of the continuous cycle compressor stays on without interruption for the CCt time Can be used
10. ET key for more than 2 seconds to change the Set point value The value of the set point will be displayed and the LED starts blinking 2 3 To change the Set value push the a or arrows within 10s 4 To memorise the new set point value push the SET key again or wait 10s 6 3 HOW TO START A MANUAL DEFROST em Push the DEF key for more than 2 seconds and a manual defrost will start 6 4 HOW TO CHANGE A PARAMETER VALUE To change the parameter s value operate as follows 1 Enter the Programming mode by pressing the Set and DOWN key for 3s 44 and 3 start blinking v 2 Select the required parameter e a 3 Press the SET key to display its value now only the 3 LED is blinking 4 Use UP or DOWN to change its value 5 Press SET to store the new value and move to the following parameter To exit Press SET UP or wait 15s without pressing a key NOTE the set value is stored even when the procedure is exited by waiting the time out to expire 6 5 THE HIDDEN MENU The hidden menu Includes all the parameters of the instrument 6 5 1 HOW TO ENTER THE HIDDEN MENU 1 Enter the Programming mode by pressing the Set key for 3s LED 1 and 3 start blinking 2 When a parameter is displayed keep pressed the Set i for more than 7s The Pr2 label will be displayed immediately followed from the HY parameter NOW YOU ARE IN THE HIDDEN MENU 3 Select the required parameter 4 Press the SET
11. c XR20C 15 DEFAULT SETTING VALUES Label Name J Rage E Pset epn isus f 0125 5 C 1 2595F 50 0 SET 58F SET US Maximum setpoint SET 110 C SET 230 F_ 110 _Ot_ Thermostat probe calibration 12 12 C 120 120 P2P Evaporator probe presence _n not present Y pres _ _y _OE Evaporator probe calibration 12 12 C 120 120F LOdS Outputs delay at startup 02255min 1 _CCt Continuos cycle duration 0 0 240h_ 00 probe probe oC o TES Resolution mimeger de decponi dE EdF Defrost termination setting Po by temper nP bytme Pb Fate Defrost termination temperature 50 500 ars TdF interval between defrost cycles 1 roome Maximum length for defrost 0 255 min rt it SEt DEF Displaying during defrost i it MAX display delay after defrost 0 255 min 30 Defrost delay after fast freezing 0 23h e 50 Le Temperat alarms configuration rE related to set Ab Ab absolute LU MAXIMUM temperature alarm Set 110 0 C Set 230 F 110 230 gt pS Oo ALL Minimum temperature alarm 50 0 C Set 58 F Set 5 ALd Temperature alarm delay 0 255 min So a Delay of temperature alarm at 0 23h e 50 1 30 start up Digital input configuration EAL extern alarm bAL lock regulation PAL press switch dor door switch dEF defrost LHt disabled Htr Cooling heating Digital input alarm delay 0 255min 5 Number of activation of pressure 0 15
12. e compressor are timed through parameters COn and COF 3 2 DEFROST Defrost is performed through a simple stop of the compressor Parameter IdF controls the interval between defrost cycles while its length is controlled by parameter MdF 1598007181 XR20C CRM GB R1 0 25 07 04 doc XR20C 1598007181 av ths SET C so Dww lll SET To display target set point in programming mode it selects a parameter or confirm an operation i DEF To start a manual defrost a UP To see the last temperature alarm happened in programming mode it browses the parameter codes or increases the displayed value DOWN To see the last temperature alarm happened in programming mode it browses the parameter codes or decreases the displayed value KEY COMBINATIONS aty To lock amp unlock the keyboard SET To enter in programming mode SET a To return to the room temperature display 4 1 USE OF LEDS Each LED function is described in the following table ILED MODE FUNCTION CS ie oN Compressor enabled 4 Flashing Programming Phase flashing with 4 Anti short cycle delay enabled JON Prosena SCS 4 Flashing Programming Phase flashing with 3 Drip time in progress GON rtonperawe aterm nappered 5 TEMPERATURE ALARM AND ITS DURATION RECORDING HACCP XR20Csignals and records temperature alarms together with their duration and max value reached See drawing Ex High te
13. e instrument 2 insert a programmed Hot Key into the 5 PIN receptacle and then turn the Controller ON 3 Automatically the parameter list of the Hot Key is downloaded into the Controller memory the doL message is blinking followed a by flashing End 4 After 10 seconds the instrument will restart working with the new parameters 5 Remove the Hot Key NOTE the message Err is displayed for failed programming In this case turn the unit off and then on if you want to restart the download again or remove the Hot key to abort the operation 12 ALARM SIGNALS Message Cause _ Outputs to par Con and COF Minimum temperature alarm Outputs unchanged 12 1 ALARM RECOVERY Probe alarms P1 and P2 start some seconds after the fault in the related probe they automatically stop some seconds after the probe restarts normal operation Check connections before replacing the probe Temperature alarms HA and LA automatically stop as soon as the thermostat temperature returns to normal values and when defrost starts Alarms EA and CA with i1F bAL recover as soon as the digital input is disabled Alarm CA with i1F PAL recovers only by switching off and on the instrument 13 TECHNICAL DATA Housing self extinguishing ABS Case XR20Cfrontal 32x74 mm depth 60mm Mounting XR20Cpanel mounting in a 71x29mm panel cut out Protection IP20
14. f and on the instrument to restart normal regulation 8 5 START DEFROST i1F dFr It starts a defrost if there are the right conditions After the defrost is finished the normal regulation will restart only if the digital input is disabled otherwise the instrument will wait until the MdF safety time is expired 8 6 INVERSION OF THE KIND OF ACTION HEATING COOLING i1F Htr This function allows to invert the regulation of the controller from cooling to heating and viceversa 8 7 DIGITAL INPUTS POLARITY The digital input polarity depends on the i1P parameter i1P CL the input is activated by closing the contact i1P OP the input is activated by opening the contact 9 INSTALLATION AND MOUNTING Instrument XR20Cshall be mounted on vertical panel in p PANEL a 29x71 mm hole and fixed using the special bracket supplied i een To obtain an IP65 protection grade use the front panel __ I 5 rubber gasket mod RG C as shown in figure BRACKET PUSH TO RELEASE SNE RUBBER le GASKET The temperature range allowed for correct operation is 0 60 C Avoid places subject to strong vibrations corrosive gases excessive dirt or humidity The same recommendations apply to probes Let air circulate by the cooling holes 10 ELECTRICAL CONNECTIONS The instrument is provided with screw terminal block to connect cables with a cross section up to 2 5 mm Before connecting cables make sure the
15. mperature alarm Temperature Max Temperature ALu High temp alarm Set ALL Low temp alarm Time Alarm duration 5 1 HOW TO SEE THE ALARM DURATION AND MAX MIN TEMPERATURE If the alarm LED is on an alarm has taken place To see the kind of alarm the max min reached temperature and alarm duration do as follows 1 Push the Up or Down key 2 On the display the following message is shown HAL for high temperature alarm LAL fot the minimum allarm followed by the Maximum minimum temperature Then the tiM tiMe message is displayed followed by the Duration in h mm 3 Then the instrument displays the temperature once again NOTE1 if an alarm is still occurring the tim shows the partial duration NOTE2 the alarm is recorded when the temperature come back to normal values 5 2 HOW TO RESET A RECORDED ALARM OR ONE THAT IS STILL OCCURRING 1 Hold the SET key pressed for more than 3s while the recorded alarm is displayed the rSt message will be displayed 2 To confirm the operation the rSt message starts blinking and the normal temperature will be displayed 6 MAIN FUNCTIONS 6 1 HOW TO SEE THE SETPOINT SET 1 Push and immediately release the SET key the display will show the Set point value 2 Push and immediately release the SET key or wait for 5 seconds to display the probe value again 1 4 Dwell 6 2 HOW TO CHANGE THE SETPOINT 1 Push the S
16. r defrost e dFd Temperature displayed during defrost rt real temperature it temperature at defrost start SEt set point dEF dEF label e dAd MAX display delay after defrost 0 255min Sets the maximum time between the end of defrost and the restarting of the real room temperature display e dAF Defrost delay after continuous cycle 0 23 5h time interval between the end of the fast freezing cycle and the following defrost related to it ALARMS e ALC Temperature alarms configuration Ab rE Ab absolute temperature alarm temperature is given by the ALL or ALU values rE temperature alarms are referred to the set point Temperature alarm is enabled when the temperature exceeds the SET ALU or SET ALL values ALU MAXIMUM temperature alarm SET 110 C SET 230 F when this temperature is reached the alarm is enabled after the ALd delay time ALL Minimum temperature alarm 50 0 SET C 58 230 F when this temperature is reached the alarm is enabled after the ALd delay time e ALd Temperature alarm delay 02255 min time interval between the detection of an alarm condition and alarm signalling e dAO Exclusion of temperature alarm at startup from 0 0 min to 23 5h time interval between the detection of the temperature alarm condition after instrument power on and alarm signalling DIGITAL INPUT i1P Digital input polarity oP the digital input is activated by opening the contact
17. talling and Operating Instructions 8 1 DOOR SWITCH INPUT i1F dor It signals the door status and the corresponding relay output status through the odc parameter no Fan normal any change CPr F_C Compressor OFF Since the door is opened after the delay time set through parameter did the door alarm is enabled the display shows the message dA and the regulation restarts The alarm stops as soon as the external digital input is disabled again With the door open the high and low temperature alarms are disabled 8 2 GENERIC ALARM i1F EAL As soon as the digital input is activated the unit will wait for did time delay before signalling the EAL alarm message The outputs status don t change The alarm stops just after the digital input is de activated 8 3 SERIOUS ALARM MODE i1F bAL When the digital input is activated the unit will wait for did delay before signalling the CA alarm message The relay outputs are switched OFF The alarm will stop as soon as the digital input is de activated 8 4 PRESSURE SWITCH i1F PAL If during the interval time set by did parameter the pressure switch has reached the number of activation of the nPS parameter the CA pressure alarm message will be displayed The compressor and the regulation are stopped When the digital input is ON the compressor is always OFF If the nPS activation in the did time is reached switch of
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