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1. f value has been changed value has been changed from 1 to 0 value has been changed from 1 to 0 The max value is now 45 bars New param The SONDA_B4 parameter now is visible and can be set on the display and from the supervisor Setting to Settings 1 The parameter has been made not visible eter for setting probe B4 0 means the probe is not used and 2 mean it used as a pressure probe The following C parameters have been modified rom 4 1 bars to 9 3 bars ue has been changed from 40 bars to 45 bars ue has been changed from 40 bars to 45 bars ax value of suction pro o 3 bars 18 C o 3 bars 18 C ax value of suction pro S ax value of suction pro S S ax value of suction pro rs Ee ee to 0 bars 50 C n C03 The default value has been changed from 20 sec to 30 sec C04 The default value has been changed from 20 sec to 10 sec C07 The compressor maintenance hour threshold has been increased The max value has been changed from 999 hours x 10 to 320 hours x 100 The default value has been changed from 200 hours x 10 to 0 hours x 100 C08 The max value has been changed from 999 hours x 10 to 320 hours x 100 C10 The max value has been changed from 999 hours x 10 to 320 hours x 100 C12 The max value has been changed from 999 hours x 10 to 320 hours x 100 C14 The max value has been changed f
2. gt SPKT 0 5 Vdc pressure MCH200485 RS485 serial sers 2678 card nnan AANAa N Line Key SPV ES multifunctionD alarm suction pressure probe PSOPZKEY Le 24 S x To program key A ke P RS485 MCH2004850 L ut ul discharge option pressure Gs NI Ge ee Lee TRADR1W04 To serial link Cod CAREL 03P220431 rel 2 3 dated 06 06 12 11 Rack DIN rail installation tLAN Top 1 FCSER00000 RS485 serial card dla PSOPZKEY programming key optional board CONVONOFFO CONVO 10A0 MCHRTF CO PWM digital PWM analogic fan speed Bottom converter converter regulator SPKT 0 5 Vdc pressure transducer i Rack TwRx GND t Programming key m Ce FCSER00000 J I GND T T GND B4 V Ss CO G 2 mmm mmm mmm LE suction E pressure prol e y eem P To serial link discharge N Line L pressure probe TRADR1W04 Fig 3 b Cod CAREL 03P220431 rel 2 3 dated 06 06 12 12 Rack 4 Compressor m
3. 11 a 32 NO 7 Y Wi Tab 10 b Rack 12 PWM to 0 to 10 Vdc or 4 to 20 mA conversion board for fans code CONVO 10A0 The CONVO 10A0 modules convert the PWM signal sent from terminal Y on the Rack to a standard 0 to 10 Vdc or 4 to 20 mA signal The FCS series three phase controllers can be connected to the Rack without requiring this module n wes 0 2 La O o Fig 12 a so 4 20m 13 Programming key code PSOPZKEYAO The programming keys PSOPZKEY00 and PSOPZKEYAO for CAREL controllers are used to copy the complete set of parameters to the pRack The keys must be connected to the connector 4 pin AMP on the controllers and can operate when the instruments are either on or off according to the instructions for the specific controller There are two main functions which are selected using the two dipswitches located under the battery cover These are Load the parameters from a controller to the key UPLOAD Copy from the key to one or more controllers DOWNLOAD Warning The parameters can only be copied only between instruments with the same product code The upload operation on the other hand is always possible To assist the identification of the key to be used CAREL has applied a label that can used to describe the programming made or the unit that the data refers to IMPORTANT NOTE The key can only be used on Rack controllers that have the same firmware version Refer to the programming k
4. Delay restart after black out R W 1 37 Enable delay at start up after a black out with the set time If 0 no delay s 0 to 999 0 Enable disable unit from the supervisor Unit ON OFF from the Rw 1 38 lo OFF 0 1 1 supervisor 1 ON Enable disable unit by parameter Unit ON OFF by parameter R W U 39 10 OFF 0 1 1 1 ON New User password R W U 40 Used to change the password to access the User branch 0 to 999 22 New Installer password R W 1 41 Used to change the password to access the Installer branch 0 to 999 44 New Manufacturer password R W C 42 Used to change the password to access the Manufacturer branch 0 to 999 77 B4 probe set 0 probe not connected B4 probe type RW C 43 1 0 to 5 V probe 0to2 2 2 0 to 5 V probe Cod CAREL 03P220431 rel 2 3 dated 06 06 12 29 Rack Parameter Type Pos Display Description UOM Range Default Notes Compressor menu Min compressor ON time R W C col inimum ON time for same compressor S 0 to 999 10 Min compressor OFF time R W C C02 Minimum OFF time for same compressor s 0 to 999 120 Min time between starts of Rw c cos inimum time between two start calls for different compressors Avoids i 0t0 999 30 different compressors simultaneous starts Min time between stop
5. 0 1 Force compressor 2 RW 06 0 NO YES anually operate compressor 2 0 1 Force compressor 3 RW 07 0 NO YES anually operate compressor 3 0 1 Force compressor 4 RW 08 0 NO YES anually operate compressor 4 0 1 Enable fan 1 RW 09 0 NO YES Enable operation of fan 1 in automatic mode 0 1 Enable fan 2 RW 0 NO YES Enable operation of fan 2 in automatic mode 0 1 Enable fan 3 RW 0 NO YES Enable operation of fan 3 in automatic mode 0 1 Enable fan 4 RW 0 NO YES Enable operation of fan 4 in automatic mode 0 1 Force fan 1 RW 0 NO YES Manually operate an 1 0 1 Force fan 2 RW 0 NO YES Manually operate an 2 0 1 Force fan 3 RW 0 NO YES Manually operate an 3 0 1 Force fan 4 RW 0 NO YES Manually operate an 4 0 1 Force inverter RW 0 NO YES Manually operate he inverter at 100 0 1 Only if the inverter is disabled 11 ON OFF fan control board code CONVONOFFO The CONVONOFFO modules allow the ON OFF control of the condenser fans The control relay has a switching power 10A at 250 Vac in ACI 1 3 HP inductive Cod CAREL 03P220431 rel 2 3 dated 06 06 12 Fig
6. 5 A M to return to the main display control pressure temperature a Press the button for more than 5 sec to select between the display of the values in BAR or C b Press the button when the list of parameters is displayed to move to the next parameter c Press the button when the numeric value of a parameter is displayed to increase the value d Press the button when a digital value is displayed YES NO to change the setting a Press the button for more than 5 sec to set the password for accessing the USER parameters b Press the button when the list of parameters is displayed to show the numeric value of the parameter c Press the button when the numeric value of a parameter is displayed to accept the numeric value and return to the list of parameters a Press the button to display the other controlled values The label of the probe will be displayed and then the numeric value Example Unit A single circuit standard LP1 y the arrows scroll to HP B2 B3 Unit B two circuit standard LP1 the arrows scroll to LP2 HP B3 b Press the button for more than 5 sec to select the probe displayed permanently as the main probe c Press the button when the list of parameters is displayed to move to the previous parameter d Press the button when the numeric value of a parameter is displayed to decrease the value e Press the button when a digital value is displayed YES NO to change the
7. address on the same serial line e The addresses on the same serial line must be set in progressive order starting from 1 For further information refer to the corresponding manual or contact CAREL 9 User interface The parameters are divided into 2 categories Display information that is NOT password protected show the values of the probes alarms Display information that is password protected 1 USER parameters password 22 modifiable by parameter 40 set the main functions of the devices connected times set points differentials 2 INSTALLER parameters password 44 modifiable by parameter 41 periodical checks on the devices calibration of the probes connected manual operation of the devices 3 MANUFACTURER parameters password 77 modifiable by parameter 42 configure the compressor rack enable the main functions and select the devices connected Once the password is entered it remains in the memory until automatically returning to the main screen so as to make it easier to move around within the same level of protection IMPORTANT To change the level of parameter protection from the keypad from the MANUFACTURER level only proceed as follows 1 Once having entered the correct PWD MANUFACTURER the system displays the string S P Set Parameters 2 Then either press SEL directly accessing the parameter menu to change the values or press DOWN or UP to display of the string L P Level Param
8. discharge pressure All fans OFF settable Cod CAREL 03P220431 rel 2 3 dated 06 06 12 24 Rack See compressor management with probe 30 seconds broken See compressor management with probe broken Force fan inverter to 100 o Display only Code Alarm description Generated by Action performed Type of reset Delay Notes A15 All comps OFF automatic A17 All comps OFF automatic A19 Suction probe 1 faulty or disconnected Settable no comps ON automatic A20 Suction probe 2 faulty or disconnected Al Settable no comps ON automatic 30 seconds A21 Discharge probe faulty or disconnected Al Settable no fans ON automatic 30 seconds A22 Fan 1 thermal overload DI Fan 1 OFF Settable no A23 Fan 2 thermal overload DI Fan 2 OFF Settable no ER Only signal alarm Preset NN A26 General fan thermal overload electronically the fan stop Automatic no during overload A27 Compressors OFF Automatic A28 Compressors OFF Automatic no E i Si ELI Zero cross 100 Fans Automatic MON voltage AB3 B3 probe error faulty or disconnected AIN Automatic o Tab 7 a 7 5 Alarms from analogue inputs temperature probe and pressure transducer Fixed differentials 0 2 bar suction 1 0 bar discharge e of LP alarm management Diff gt Alarm on Alarm off Low press Set Point Fig 7 a Diff of HP alarm management lt _ Alarm on Alarm off Set Point High p
9. 4 compressors unit with fan speed regulator o oj 2 Si ej si Cf sl SS V bei KC 9 o E 5 suction 5 pressure 3 probe 2 4 discharge pressure probe RS485 option Line Fig 17 a 2 compressors unit 2 condenser fans To program key Q To serial link ele all GND B4 V o 3 3 5 1D3 ID1 Key SPV o zb CONAN EIS Es ez Selen Iess S d 2 i E el al sl d E suction E e z 5 pressure H EEE ES of of ei A S To program key KE RS485 19 discharge option pressure probe l O N L Line To serial link Fig 17 b Cod CAREL 03P220431 rel 2 3 dated 06 06 12 39 Rack 3 compressors unit with 2 fan steps and speed regulator no alarm relay output QA ext temp probe amb temp probe Le 0 TI Line F probe 2 compressors unit 3 condens
10. 4 outputs are used this parameter is ignored and the Multifunction Input is set as fan thermal overload B1 probe type E D B1 probe set 0 probe not connected 1 NTC probe 2 0 to 5 V probe 0to 2 MIN suction pressure 117 Set the minimum value of suction probe bar 10t0 19 Cod CAREL 03P220431 rel 2 3 dated 06 06 12 28 Rack Parameter Type Pos Display Description UOM Range Default Notes E 2 R W C 8 et the minimum value of discharge probe suction probe of second circuit bar 1 0 to 20 0 MAX suction pressure R W C 19 Set the maximum value of the suction probe bar 17 to 45 0 9 3 MAX discharge suction 2 c 20 Set the maximum value of the discharge probe suction probe of second bar 18 t0450 345 pressure circuit B2 probe set 0 probe not connected B2 probe type RME Ei 1 ambient air temp probe for two circuit condenser probe BS e 2 auxiliary temperature probe used for HT alarm B3 probe set 0 probe not connected B3 probe type B r 1 outside air temp probe SS S 2 auxiliary temperature probe used for HT alarm B4 probe calibration suction RW 1 23 CERS bar 12 to 12 0 B1 Probe calibration e discharge R W 1 24 Discharge probe calibration bar 12 to 12 0 B2 probe calibration RW 1 25 Room probe calibration C 12 to 12 0 B3
11. 5 08 mm high 11 1 mm DIN version only Accessories MCH2CONO001 connectors kit for uChiller2 uRack panel mounting version MCH2CONO011 connectors kit for uChiller2 uRack DIN rail mounting version Warning the connectors kit MCH2CON contains a 2 pins connector for the tLAN which is not used for pRack MCHSMLCONM mini fit 2x6 and 2x7 pin connectors kit MCHSMLCABO 24 cables kit 1 mm L 1 m preset for mini fit connection MCHSMLCAB2 24 cables kit 1 mm L 2 m preset for mini fit connection MCHSMLCAB3 24 cables kit 1 mm L 3 m preset for mini fit connection MCH2004850 RS485 serial board for per uRack panel mounting version FCSER00000 RS485 serial board for per Rack DIN rail mounting version PSOPZKEYO0 programming key with 12 Vdc batteries included PSOPZKEYAO programming key with 230 Vac external power supply Rack KIT code uRack RS485 Ratiometric pressure probe Cables for Connectors kit 2 m cables kit pressure MCHSMLCAB2 1 4 2 bar 1 9 3 bar 1 12 8bar 0 34 5 bar probe MRK00010DK DIN No 1 1 2 DIN No MRK000200K panel No 1 2 panel No MRK00030DK DIN No 1 2 DIN Yes MRK000400K panel No 1 2 panel Yes MRK00050DK DIN No 1 2 DIN Yes MRK000600K panel No 1 2 panel Yes MRK00090DK DIN No 1 1 2 DIN Yes MRK000800K panel No 1 1 2 panel Yes Cod CAREL 03P220431 rel 2 3 dated 06 06 12 38 19 Appendix Compressor rack controller examples of application diagrams
12. A babe 23 ALARM MANAGEMENT css asista 24 AMOS a alice alal 24 Alarms withitanuali tS BE nire elio di A ea ie Ari 24 E eE EE 24 ETC ARR aac aaa O i 24 Alarms from analogue inputs temperature probe and pressure transducer ii 25 THE SUPERVISOR NETWORK eeh 26 SE Re st Partenio kiedere alii io de io lai 26 COMMUNICATION POLO CO rara tate AAA E Va RIO se ES eNOS 26 UN TEE e lee 26 LIST OF PARAMETERS mnt identitaire EEN ON OFF FAN CONTROL BOARD CODE CONVONOFF 0 PWM TO 0 TO 10 VDC OR 4 TO 20 MA CONVERSION BOARD FOR FANS CODE CONVO 10A0 PROGRAMMING KEY CODEPSOPZKEVAD ico cari dde a di SUPERVISOR MANAGEMEN T spoon aia aiii DEFAULT CONFIGURATIONS ann EA 36 RON NOS TECHNICAL SPECIFICATION PRODUCT ee APPENDIX COMPRESSOR RACK CONTROLLER EXAMPLES OF APPLICATION DIAGRAMS APPENDIX CHANGES INTRODUCED IN FW RELEASE 2 0 FOR MRKOOOOXXO ENEE 4 APPENDIX CHANGES INTRODUCED IN FW RELEASE 3 42 APPENDIX CHANGES INTRODUCED IN FW RELEASE 37 42 APPENDIX CHANGES INTRODUCED IN FW RELEASE 2 3 ccoo ca 42 Rack 1 Product 1 1 General functions Read pressure transducers display data in BAR C depending on the type of refrigerant gas Management of compressors with the same and different capacities Management of compressor racks with two circuits MT and LT Setting of the number of compressors fans on the unit Rotation of the compressors FIFO and by time FIFO rotation of the fans Fan speed control PWM OUTPUT Compres
13. C14 R W 38 Type of compressor rotation r05 R W 39 Type of compressor control r06 R W 40 Maximum call for compressor starts in dead band by time r08 R W 41 Maximum call for compressor stops in dead band by time r10 R W 42 Type of fan rotation r20 R W 43 Type of fan control r21 R W 44 Integral time for P fan control 122 R W 45 Time between 2 fans starts in dead band 123 R W 46 Time between 2 fans stops in dead band 124 R W 47 Inverter speed up time r27 R W 48 Inverter ramp up time 128 RW 49 Minimum inverter output r29 R W 50 Maximum inverter output r30 R W 51 Triac impulse duration r31 R W 52 High suction pressure 1 alarm delay A02 R W 53 Low suction pressure 1 alarm delay A04 R W 54 High suction pressure 2 alarm delay A06 R W 55 Low suction pressure 2 alarm delay A08 R W 56 Low discharge pressure alarm delay A11 R W 57 Compressor thermal overload alarm delay A12 R W 58 Prevent time in which no compressor starts are enabled A13 R W 59 Prevent time in which the activation signals the alarm A14 R W 60 Time to reset prevent alarm A15 R W 61 Alarm signal delay A20 R W 62 Time to change low pressure alarm from automatic to manual A21 R W 63 B4 type probe 143 R 65 Capacity percentage of first capacity controlled compressor with configuration 01 9 10 11 12 13 e 14 R 66 Capacity percentage of second capacity controlled compressor without configuration 01 9 10 11 12 13 e 14 Tab 14 d 15 Default configurations Signal Type of analogue inputs Descrip
14. CAREL Rack Standard compressor racks single two circuit 5 HRack ENG User manual LEGGI E CONSERVA QUESTE ISTRUZIONI READ AND SAVE THESE INSTRUCTIONS A NOPOWER i amp SIGNAL De CABLES 1 TOGETHER READ CAREFULLY IN THE TEXT Technology amp Evolution WARNINGS CAREL bases the development of its products on decades of experience in HVAC on the continuous investments in technological innovations to products procedures and strict quality processes with in circuit and functional testing on 100 of its products and on the most innovative production technology available on the market CAREL and its subsidiaries nonetheless cannot guarantee that all the aspects of the product and the software included with the product respond to the requirements of the final application despite the product being developed according to start of the art techniques The customer manufacturer developer or installer of the final equipment accepts all liability and risk relating to the configuration of the product in order to reach the expected results in relation to the specific final installation and or equipment CAREL may based on specific agreements acts as a consultant for the positive commissioning of the final unit application however in no case does it accept liability for the correct operation of the final equipment system The CAREL product is a state of the art product whose operation is specified in the technical documentation s
15. Display code RW 17 Min fan set point 125 bar R W 18 Min fan set point 125 C R W 19 Max fan set point r26 bar R W 20 Max fan set point r26 C R W 21 Fan inverter set point r18 bar R W 22 Fan inverter set point r18 C R W 23 Fan inverter differential r19 bar R W 24 Fan inverter differential r19 C R W 25 HP suction 1 alarm threshold A01 R W 26 LP suction 1 alarm threshold A03 R W 27 HP suction 2 alarm threshold A05 R W 28 LP suction 2 alarm threshold A07 R W 29 HP discharge alarm threshold A09 bar R W 30 HP discharge alarm threshold A09 C R W 31 LP discharge alarm threshold A10 bar R W 32 LP discharge alarm threshold A10 C R W 33 Probe B4 calibration 23 RW 34 Probe B1 calibration 24 R W 35 Probe B2 calibration 25 R W 36 Probe B3 calibration 26 R W 37 Min value suction probe 7 R W 38 Min value discharge probe 18 R W 39 Max value suction probe 19 R W 40 Max value discharge probe 20 RW 41 Set point prevent high pressure function 33 R W 42 Set point offset to change set from DI r34 R W 43 Differential pressure for dead band by time rll R W 44 Condensing temperature delta for floating control 133 R W 45 High temp threshold probe B2 A16 R W 46 High temp threshold probe B3 A17 Tab 14 a Digital variables Flow Index Description Parameter R W 1 Unit on R 2 Status of compressor 1 R 3 Status of compressor 2 R 4 Status of compressor 3 R 5 Status of compressor 4 R 6 Status o
16. PRG MANUFACTURER Possibility to configure all the unit parameters using a hardware key Possibility to configure the main unit parameters via serial line Possibility to modify the access level to the parameters from the keypad only from MANUFACTURER level Hardware e The product comes ready for panel installation 32x74 and DIN rail mounting Cod CAREL 03P220431 rel 2 3 dated 06 06 12 7 Rack 2 User interface The product uses a 3 digit LED display with minus sign and decimal point to display the monitored values and ICONS for the status of the devices and operating modes As well as displaying the values measured and the operating conditions of the unit the user terminal dispay and keypad can be used to modify the unit operating parameters The following figures show the Rack for panel installation and for DIN rail mounting 2 1 Buttons LEDs Icons Button Prg mute bar C Sel HP LP Description a Press the button when switching the instrument on until the string DEF is shown on the display to load the default values b Press the button for more than 5 sec to set the password for accessing the INSTALLER parameters c Press the button for more than 3 sec when the list of parameters is displayed to accept the modifications and return to the main display control pressure temperature d Press the button for more than 3 sec when the list of parameter groups is displayed C 1
17. PWM signal The example below shows two graphs representing the two modes In the graph it can be seen that the request is 80 of the maximum value V 5 Volt Fig 5 8 The PWM signal controls for example the CAREL FCS series CONVONOFF CONO 10A0 modules ON OFF fan control board code CONVONOFFO The CONVONOFFO modules convert the PWM signal sent from terminal Y to an ON OFF signal In practical terms Y can be used to control a relay Switching power 10A at 250 Vac in ACI 1 3 HP inductive PWM to 0 to 10 Vdc or 4 to 20 mA conversion board for fans code CONVO 10A0 The CONV0 10A0 modules convert the PWM signal sent from terminal Y to a standard 0 to 10 Vdc or 4 to 20 mA signal Calculation of the minimum and maximum fan speed This procedure should only be performed if fan speed control boards are used code MCHRTF 0 0 It must be stressed that if the ON OFF modules code CONVONOFFO or the PWM 0 to 10 V converters code CONVO 10A0 or FCS are used the Min triac parameter r29 should be set to zero and the Max triac r30 parameter to the maximum value is the impulse period r31 0 Given the range of different motors existing on the market the voltages supplied by the electronic board that correspond to the minimum and maximum speed can be set For this purpose and if the default values are not suitable proceed as follows 1 Set the fan inverter to always On Force inverter parameter M17 Set Max t
18. anagement Inputs used e Suction pressure probe probes e Digital inputs dedicated to the compressor safety devices e Multifunction input for generic alarm general suction pressure switch 1 and 2 Outputs used e Compressor outputs and capacity control 4 1 General settings Parameters used for ON OFF control e number of compressors capacity controlled and not e compressor times e type of control The compressors are managed by the controller based on a pressure set point parameter r01 and differential parameter r02 measured by the suction probe In the case of two circuits the set point and the differential also need to be set for the second circuit parameters r03 and r04 4 2 Compressor rotation Rotation parameter r05 of the compressor calls ensures that the number of operating hours and the number of starts of the different compressors balance out Rotation automatically excludes any compressors with alarm or that are disabled If the compressor is off for alarm or disabled is excluded from regulation and rotation the activation deactivation thresholds are re calculated based from actual number of compressors available In the default configuration FIFO rotation has been selected Three different types of rotation can be set for the capacity control only devices rotation type available is LIFO no depending by r05 parameter LIFO rotation no rotation The first compressor to start will be the last to stop fir
19. ated 06 06 12 19 Rack Proportional and integral control PI To minimise any deviations in stable operating conditions between the controlled value and the set point typical of proportional control a proportional plus integral strategy P I can be sued This strategy helps overcome situations of stalemate in which the working point remains steadily at a value other than the set point PI control adds the integral action to proportional control This action when a control error persists has an increasing effect over time on the overall control action The parameter that defines the integral action is the integral time r22 The default value is 600 s 10 min The integral time corresponds to the time taken by the integral action with a constant error to balance the proportional action The lower the integral time the faster the response of the control For further information refer to classic control theory N B Make sure the integral time is not set too low otherwise control may become unstable The following figure highlights the difference between the proportional control and proportional plus integral control with inverter Proportional control Proportional Integral control 10 Volt 10 Volt Min In Fig 5 e Key RP Pressure read SP Set point T Time Min In Minimum inverter output value Dead band control This control requires the setting of inverter set point the inverter pressure differential for dead
20. band control parameter r21 and the inverter ramp up time parameter r28 Three zones are defined activation zone DOnz dead band NZ and deactivation zone DOffZ in which the program behaves differently see the figure In the activation zone DonZ the fans are started as follows The inverter is activated as soon as there is demand with a value no less than the minimum inverter opening Minin The inverter output is increased according to the times set by parameter r23 Ifthe inverter output reaches 100 the situation persists In the dead band NZ the inverter output does not undergo any variation In the deactivation zone DoffZ the fans are stopped as follows The inverter output is progressively brought to the minimum value according to the times set by parameter r24 When reaching the minimum value the fans are stopped r re Key SE SE i O a A w InPress Discharge pressure i i B Set point differential gg i StpM HP set point qu E E A A DOnZ Activation zone DOffZ Deactivation zone i NZ Dead band T s Time Inverter Inverter status NFan Number of fans on Fig 5 f Cod CAREL 03P220431 rel 2 3 dated 06 06 12 20 Rack 5 4 PWM PPM management On the controller the fan control output generates a PWM signal This output is used to drive phase control modules that directly control the fan speed The output depending on how it is configured can generate a pulse width modulation
21. capacity control 14 1 compressor 2 capacity control 1 compressor Compressors with different capacities 02 Enable management of compressors with different capacities 0 NOT ENABLED 1 ENABLED 0 1 For single circuit only for the configuration 01 1 2 3 e 4 Capacity compressor 1 03 Capacity of compressor 1 kW 0 to 999 Only if comp with different capacities a enabled e Capacity compressor 2 104 Capacity of compressor 2 kW 03 to 999 Only if comp with different capacities a enabled e Capacity compressor 3 05 Capacity of compressor 3 kW 03 04 to 999 20 Only if comp with different capacities a enabled e Capacity compressor 4 06 Capacity of compressor 4 kW 03 04 05 to 999 40 Only if comp with different capacities are enabled Number of compressors ON with suction probe 1 fault 07 If the suction 1 probe fault or not connected alarm is activated this number of compressors are started These are in any case managed by the individual alarms and general pressure switches Oto4 Number limited by the number of compressors Number of compressors ON with suction probe 2 fault 08 If the suction 2 probe fault or not connected alarm is activated this number of compressors are started These are in any case managed by the individual alarms and general pr
22. current at 250 Vac EN60730 Resistive 3 A Inductive 2 A cos j 0 4 60000 cycles UL Resistive 3 A 1 FLA 6 LRA cos j 0 4 30000 cycles Minimum interval between switching cycles each relay 12 s the manufacturer of the unit that the device is built into must ensure the correct configuration to respond to this specification Type of micro switching of the relay 1 C Insulation between relays in group A functional Insulation between relays in group A and the very low voltage parts reinforced Insulation between relays in group A and the signal relay primary Insulation between the signal relay and the very low voltage parts reinforced Insulation between relays and the front panel reinforced Digital inputs ID1 to ID5 IDB4 Electrical standard voltage free contact Closing current to ground 5 mA Maximum closing resistance 50 W Analogue inputs B1 B2 B3 B4 CAREL NTC temperature probes 10 kW at 25 C The response time depends on the component used typical value 90 sec B4 NTC temp probes 10 kW at 25 C or CAREL 0 to 5 V or free contact ratiometric pressure probes Fan output Control signal for CAREL MCHRTF CONVONOFF CONVO 10A and FCS modules Modulation of impulse position set amplitude or modulation of the duty cycle Refer to the user manual for the configuration of the parameters Loadless voltage 5 V 10 Short circuit current 30 mA Minimum ou
23. d R W A16 High temperature threshold probe B2 Ke 40 to 150 100 e temp probe threshold R W A17 High temperature threshold probe B3 E 40 to 150 100 Delay liquid level alarm R W A18 Set the liquid level alarm delay from multifunction input m 0 to 500 60 Reset the alarms with manual reset Reset ALARMS R W U A19 0 NO RESET 0 1 0 1 RESET Alarm signal delay R W A20 Set alarm signal delay s 0 to 999 1 Exchange auto gt man LP 3 RW 1 A On the 3rd activation within the set time the low pressure alarm from d O to 999 10 alarms pressure switch changes from automatic to manual reset OFF due to probe Enable unit OFF due to probe disconnected alarm RW 1 A22 0 NO 0 1 0 disconnected 1 YES Maintenance menu Cod CAREL 03P220431 rel 2 3 dated 06 06 12 31 Rack Parameter Type Pos Display Description UOM Range Default Notes Enable compressor 1 RW M01 0 NO YES Enable operation of compressor 1 in automatic mode 0 1 Enable compressor 2 RW Mo2 0 NO YES Enable operation of compressor 2 in automatic mode 0 1 Enable compressor 3 RW 03 0 NO YES Enable operation of compressor 3 in automatic mode 0 1 Enable compressor 4 RAW 04 0 NO YES Enable operation of compressor 4 in automatic mode 0 1 Force compressor 1 RW 05 0 NO YES anually operate compressor 1
24. d in the hundreds of hours as the resolution of the display is only 3 digits Parameters C08 C10 C12 C14 are used to check the number of operating hours of the compressors installed These parameters are also expressed in the tens of hours as the resolution of the display is only 3 digits Parameters CO9 C11 C13 C15 are used to reset each individual hour counter The compressor maintenance alarm is shown by an alarm code as well as by the simultaneous activation of the Maintenance and Alarm icons 6 3 Set point variation from digital input This function is useful when needing to increase or decrease the set point during night time operation An offset is added to the compressor set point when the multifunction input set for this function is closed The offset can be defined using parameter R34 6 4 Type of refrigerant By selecting the type of refrigerant used in the installation parameter 35 the software will automatically calculate the conversion of the pressure to temperature The following table lists the types of gas managed Refrigerant Complete name R134a Tetrafluoroethane R290 Propane R600 Butane R600a 2 methyl propane isobutane R717 Ammonia NH3 R744 Carbon dioxide CO2 R404A R407C R410A R507C Mixes of gases Tab 6 a 6 5 Auxiliary probe management The software can manage two auxiliary temperature probes in addition to the suction and discharge probes The two probes can be configured w
25. devices fans and compressors selected If 4 devices are selected e g 2 compressors not capacity controlled 2 fans relay 5 can be used as an alarm relay default setting while if 5 devices are controlled e g 2 compressors not capacity controlled 3 fans output no 5 is automatically used to control a fan In addition the use of speed control by phase control or inverter can be set for the fans managed using the PWM signal 3 2 1 Input configuration Inputs from 1 to 4 are alarm inputs for the compressors and fans configured If 5 devices are controlled by the unit input no 5 is automatically an alarm input fan alarm only The user can decide whether the alarm inputs are normally closed the alarm condition exists when the contact is open or normally open the alarm condition exists when the contact is closed by setting parameter 14 If 4 devices or less are connected to the controller input 5 automatically becomes a multifunction input Parameter 15 can be used to configure the multifunction input e 0 no function 1 unit ON OFF ON contact NC 2 change set point set1 set2 3 general high pressure switch NC 4 general high pressure switch 1 NO 5 general low pressure switch circuit 1 NC 6 general low pressure switch circuit 1 NO 7 general low pressure switch circuit 2 NC 8 general low pressure switch circuit 2NA 9 liquid level alarm NC 10 liquid level alarm NO 11 fan thermal overload generic NC 12 fan the
26. e on This is used to prevent the condenser fans operating with high outside temperatures work when no compressor is operating Typical application cold rooms cold stores Parameter 13 default 0 independent control Inverter control Proportional band This control requires the inverter set point STPI to be set parameter r18 plus an inverter differential RBI parameter r19 If the value measured by the discharge probe is less than or equal to the value of the inverter set point the inverter output will be 0 Between the inverter set point STPI and point C set point differential the value of the inverter output will be proportional to the value read by the discharge probe and in any case not less than the minimum inverter output Minin If the value measured by the discharge probe is greater than or equal to the inverter set point differential the output will be at the maximum value The control is not associated with any fan and can work without fans being configured Key can r EN RB Fan differential i P Rao RBI Inverter differential 10 Volt a mannana STPM Discharge set point LC i STPI Inverter set point C Inverter set point inverter differential B Discharge set point Fan differential Min In Minimum value of the inverter control output Fig 5 d Proportional control set by parameter r21 may be proportional only parameter r21 0 or proportional integral parameter r21 1 Cod CAREL 03P220431 rel 2 3 d
27. eneral low suction pressure 1 A10 from multifunction DI R I Alarm general low suction pressure 2 All from multifunction DI R 2 Alarm low discharge pressure Al3 R 3 Alarm high discharge pressure Al4 R 4 Alarm low suction pressure 1 Al5 R 5 Alarm high suction pressure 1 A16 R 6 Alarm low suction pressure 2 Al7 R 7 Alarm high suction pressure 2 A18 R 8 Probe B1 faulty or disconnected A20 R 9 Probe B2 faulty or disconnected AB2 R 20 Probe B3 faulty or disconnected AB3 R 21 Probe B4 faulty or disconnected A19 R 22 Compressor 1 maintenance A05 R 23 Compressor 2 maintenance A06 R 24 Compressor 3 maintenance A07 R 25 Compressor 4 maintenance A08 R 26 General discharge pressure switch from multifunction DI A12 R 27 General fan thermal overload A26 R 28 Prevent high discharge pressure A27 R 29 Compressors off due to prevent A28 R 30 Excessive prevent frequency A29 R 31 High outside temperature HE R 32 High room temperature HtA Tab 14 c Integer variables Flow Index Description Parameter R W 1 Type of unit 00 00 R W 2 Unit model 01 01 R 3 Number of compressors R W 4 Number of fans 09 09 Unit status 0 Unit ON 1 OFF from alarm 2 OFF from supervisor R 5 3 OFF from remote input 4 OFF from parameter 5 Manual operation 6 Install default 7 PREVENT IN PROGRESS R W 6 Minimum call time for compressor start dead band r07 R W 7 Minimum call time for compressor stop dead band r09 R W 8 Mi
28. er fans Fig 17 c suction pressure probe discharge pressure To program key RS485 option Q To serial link ext temp probe amb temp probe Line alarm F3 I Cod CAREL 03P220431 rel 2 3 dated 06 06 12 Fig 17 d 40 suction pressure probe discharge pressure probe 0000 A d To program key RS485 option Q To serial link Rack 20 Appendix Changes introduced in Fw release 2 0 for MRK0000XX0 The latest FW release has changed from 1 7 to 2 0 Modifications have been made to the following strings AS2 has been replaced by AB2 AS3 has been replaced by AB3 S3 has been replaced by B2 S4 has been replaced by B3 Rack In the case of two refrigerant circuits a fixed delay of 4 seconds has been introduced between the start of the first compressor in the first refrigerant circuit and the start of the first compressor in the second refrigerant circuit The following parameters have been modified 15 NT 18 19 20 29 30 33 34 143 The default Th Th Th Th Th Th default default e e e e e e default The max value is now 19 max value is now 20 Max Va Max Va value has been changed from 3 to 0
29. essure switches For two circuits only Configure number of fans Set the number of fans 0 to4 Number limited by the number of compressors already enabled Enable fan inverter Enable control of the fans with inverter 0 1 Display inverter output value at ae eee ae eee E Display the inverter output as a percentage 0 to 100 Number of fans ON with probe fault If the discharge probe fault or not connected alarm is activated this number of fans are started These are in any case managed by the individual alarms and general pressure switches 0to4 Enable fans with compressors ON 0 independent operation of the fans 1 fans on only when at least one compressor is ON 0 1 Digital input logic N O No alarm Jl 2 Set the logic of the digital inputs 0 N O with no alarm the contact is open 1 N C with no alarm the contact is closed 0 1 NO NC Multifunction input configuration 15 Set the type of multifunction input 0 no function 1 unit ON OFF NC contact ON 2 change set point set1 set2 3 general high pressure switch NC 4 general high pressure switch NO 5 general low pressure switch 1 NC 6 general low pressure switch 1 NO 7 general low pressure switch 2 NC 8 general low pressure switch 2 NO 9 liquid level alarm NC 10 liquid level alarm NO 11 general fan thermal overload NC 12 general fan thermal overload NO Oto 12 If the
30. eters 3 If modifying the level pressing SEL accesses the parameter menu as described where parameters are scrolled no longer displayed with the associated value but rather the level of protection Using the same procedure as for modifying the parameters change the level choosing between the 3 possible levels available U_ parameters visible at User level parameters visible at Installer level _C_ parameters visible at Manufacturer level Cod CAREL 03P220431 rel 2 3 dated 06 06 12 26 Rack 10 List of parameters This table contains the list of all the parameters with the corresponding description Parameter description Type R read only R W read write Pos position USER INSTALLER MANUFACTURER Description synthetic description of the parameter UOM unit of measure of the value in question Range range of possible values for the parameter Default factory set value of the parameter Notes column available for user notes IMPORTANT Not all the screens listed below will be displayed when scrolling the display enabling a certain type of configuration will mean that new screens are displayed that were previously not available The display therefore depends on the initial configuration USER PARAMETERS LL Sel Press the SEL button for at least 5 secs RER INSTALLER Prg PARAMETERS LE Press the button PRG per at least 5 secs PW 44 Prg Press the PRG SEL button toge
31. evice in any way other than described in the manual Do not drop hit or shake the device as the internal circuits and mechanisms may be irreparably damaged Do not use corrosive chemicals solvents or aggressive detergents to clean the device Do not use the product for applications other than those specified in the technical manual o All of the above suggestions likewise apply to the controllers serial boards programming keys or any other accessory in the CAREL product portfolio CAREL adopts a policy of continual development Consequently CAREL reserves the right to make changes and improvements to any product described in this document without prior warning The technical specifications shown in the manual may be changed without prior warning The liability of CAREL in relation to its products is specified in the CAREL general contract conditions available on the website www carel com and or by specific agreements with customers specifically to the extent where allowed by applicable legislation in no case will CAREL its employees or subsidiaries be liable for any lost earnings or sales losses of data and information costs of replacement goods or services damage to things or people downtime or any direct indirect incidental actual punitive exemplary special or consequential damage of any kind whatsoever whether contractual extra contractual or due to negligence or any other liabilities deriving from the instal
32. ey instruction sheet for further details Fig 13 a 14 Supervisor management The controller can be connected to a local or remote supervisor telemaintenance system for managing the unit The variables sent and received by the supervisor are shown in the tables below with reference to the following key R Read Send from the Rack to the supervisor Not modifiable R W Read Write Received and sent from the pRack to the supervisor Can be modified by the supervisor Analogue variables Flow Index Description Display code R 1 Probe B4 LP1 R 2 Probe B1 HP LP2 R 3 Probe B2 ambient air B2 R 4 Probe B3 outside air B3 R W 5 Suction set point circuit 1 ul R W 6 Differential circuit 1 r02 R W 7 Suction set point circuit 2 r03 R W 8 Differential circuit 2 r04 R W 9 Min suction set point 1 r12 R W 10 Max suction set point 1 r13 R W 11 Min suction set point 2 r14 R W 12 Max suction set point 2 r15 R W 13 Fan set point r16 bar R W 14 Fan set point r16 C R W 15 Fan differential r17 bar R W 16 Fan differential r17 C Cod CAREL 03P220431 rel 2 3 dated 06 06 12 33 Rack Flow Index Description
33. f fan 1 R 7 Status of fan 2 R 8 Status of fan 3 R 9 Status of fan 4 R 0 Status of digital input 1 R 1 Status of digital input 2 R 2 Status of digital input 3 R 3 Status of digital input 4 R 4 Status of digital input 5 RW 5 Reset alarms A19 R W 6 Digital input logic 14 RW 7 Alarm relay logic 28 RW 8 Enable fan inverter 10 RW 9 ON OFF from supervisor 38 R W 20 Enable prevent control on condenser 32 R W 21 Enable management of different compressors 02 RW 22 Type of compressor reset 29 R W 23 Type of fan reset 30 R W 24 Type of reset for general high press switch 131 R W 25 Reset compressor 1 hours C09 R W 26 Reset compressor 2 hours C11 R W 27 Reset compressor 3 hours C13 R W 28 Reset compressor 4 hours C15 R W 29 Enable floating condenser control r32 R W 30 Enable unit Off due to probe fault A22 R W 31 Enable fans with compressor ON 13 Tab 14 b Cod CAREL 03P220431 rel 2 3 dated 06 06 12 34 Alarms sent to the supervisor Rack Flow Index Description Alarm code R 1 Alarm compressor 1 A01 R 2 Alarm compressor 2 A02 R 3 Alarm compressor 3 A03 R 4 Alarm compressor 4 A04 R 5 Alarm fan 1 A22 R 6 Alarm fan 2 A23 R 7 Alarm fan 3 A24 R 8 Alarm fan 4 A25 R 9 Alarm liquid level A09 R 0 Alarm g
34. from regulation and rotation the activation deactivation thresholds are re calculated based from actual number of fans available Two different types of rotation can be set Cod CAREL 03P220431 rel 2 3 dated 06 06 12 18 Rack LIFO rotation no rotation parameter r20 0 The first fan that to start will be the last to stop e Start Fan Fan2 Fan3 Fand e Stop Fan3 Fan3 Fan2 Fan1 FIFO rotation parameter r20 1 The first fan that to start will be the first to stop e Start Fan Fan2 Fan3 Fand e Stop Fan1 Fan2 Fan3 Fand The rotation of the fans is implemented when called Various fan parameters In the event of a discharge probe fault or not connected alarm parameter 12 sets the number of fans that are forced on 5 3 Inverter management The fan controller is enabled by parameter 10 A minimum limit value can be set for the inverter parameter r29 as a percentage To assist the start of the inverter a time can be set expressed in seconds during which the inverter is forced on at 100 at startup before proceeding with the normal regulation This parameter is called Speed Up Time parameter 127 Key STPI Fan inverter set point RBI Inverter differential Min In Minimum inverter opening C Fan set point differential Fig 5 c Management of the fans slaved to the compressors Parameter 13 defines whether the fans can be activated independently or whether at least one compressor must b
35. g parameters must be configured e Maximum compressor on time capacity control parameter r08 e Minimum compressor on time capacity control parameter r07 e Pressure differential within which the time varies parameter r11 e Maximum compressor off time capacity control parameter r10 e Minimum compressor off time capacity control parameter r09 I I I lt DTNZ RBM SC DTNZ gt I l TOffMax I TOffMin DOffZ NZ STPM B InPress bar Fig 4 c Key InPress Suction pressure DTNZ Differential within which the time varies STPM Control set point TOnMax Maximum compressor on time RBM Control band TOnMin Minimum compressor on time NZ Dead band TOffMax Maximum compressor off time DOnZ Device activation zone TOffMin Minimum compressor off time DOffZ Device deactivation zone In the activation phase the following cases are possible 1 Pressure equal to point b same call time as the maximum compressor on time 2 Pressure between point b and point b DTNZ type of call between Max on time and Min on time 3 Pressure greater than or equal to point b DTNZ same call time as Min on time In the deactivation phase on the other hand the following cases are possible 1 Pressure equal to point STPM same call time as the maximum compressor off time 2 Pressure between point STPM and point STPM DTNZ type of call between Max off time and Min off time 3 Pressure greater tha
36. ital input is typically detected when the contact opens however the logic can be selected using the digital input logic parameter 14 7 1 Alarms with automatic reset When one or more automatic reset alarms are detected these are signalled by e Red ALARM LED on e Alarm relay changes if enabled Press the PRG MUTE button If the cause of the alarms is resolved the devices that have shutdown will restart normal operation and the status of the signal devices changes as follows e The alarm relay changes to normal status e Red ALARM LED goes off If in this situation new alarms are activated the initial situation will return The signal will remain active to leave a sign of alarm ON until the operator manually sets the reset alarms parameter A19 7 2 Alarms with manual reset The compressor thermal overload parameter 29 fan thermal overload parameter 30 alarms can be set as manual reset When one or more manual reset alarms are detected these are signalled by e Red ALARM LED on e Alarm relay changes if enabled If the cause of the alarms has been resolved the red LED stays on to inform the user that alarms have been activated during the day In this situation the alarm relay remains in an alarm condition and the devices remain disabled until the user deleted the alarm messages using parameter A19 If in this situation new alarms are activated the initial situation will return If the causes no longer exist
37. ith parameters 21 and 22 No Channel NTC probe B2 room temperature probe read only auxiliary probe 2 B3 outside temperature probe for Floating condenser control auxiliary probe Tab 6 b If the auxiliary probe selected a high temperature threshold can be set parameter A16 A17 This alarm has automatic reset with a fixed differential of 2 C Example of HT alarm management lt Fig 6 a Cod CAREL 03P220431 rel 2 3 dated 06 06 12 22 Rack 6 6 Prevent high discharge pressure This function is enabled by parameter 32 In order to prevent the activation of the general high pressure switch total shutdown of the compressors with manual reset a prevention function can be enabled by setting a pre alarm threshold this function gradually decreases the capacity of the unit The high pressure prevention Prevent HP function is only enabled during the activation and deactivation of the compressors Ifthe discharge pressure exceeds the threshold set parameter 33 the activation of any compressors is disabled and a prevent alarm is generated In addition all the compressor load steps are deactivated observing the times set for parameter C06 If the discharge pressure falls below the Prevent threshold any other compressor start calls are ignored for a set time called Prevent time 1 parameter A13 If between the start of two prevent cycles a time less than Prevent time 2 parameter A14 e
38. l defines a pressure or temperature difference from the corresponding set point Discharge pressure or temperature measured at the compressor outlet This is an analogue value HP High pressure Integer value integer value without decimal point LP Low pressure Proportional band this defines a temperature or pressure zone of a few degrees starting from the set point inside which the system manages the control devices Range range of values available for a parameter Step defines an area of the proportional band pressure or temperature inside which a device is on and at the same time also defines the dewice on off values Set point defines a pressure or temperature value to be satisfied the system activates or deactivates the devices so that the value measured reaches the set point Suction pressure or temperature measured at the compressor intake This is an analogue value Upload the operation used to copy the application software from the computer or programming key to the pRack 17 Technical specification Group A is defined in the following specifications as the grouping of the following outputs compressor 1 compressor 2 fan 1 fan 2 alarm Power supply 24 Vac range 15 10 50 60 Hz Maximum current output 3 W Fuse to be fitted in series with the power supply of the Rack 315 mAT 12 pin connector Max current 2 A for each relay output extendable to 3 A for one output Relays Max
39. lapses the Excessive prevent frequency alarm is generated A29 The Excessive prevent frequency alarm display only is reset automatically if within Prevent time 3 parameter A15 the prevent function is not activated again This alarm can be reset manually by the user momentarily disabling the PREVENT function using parameter 32 Fig 6 b Key OutPress Decharge pressure T Time NCmp Number of suction steps required ALPrv High pressure prevention alarm STPpr Prevent HP activation threshold TI Time between compressor stops with prevent HP active Dprev1 Step activation delay after end prevent HP prevent time 1 Dprev2 Minimum time for activation of high prevent frequency alarm prevent time 2 Cod CAREL 03P220431 rel 2 3 dated 06 06 12 23 Rack 7 Alarm management The activation of an alarm from digital input causes the direct action on the devices involved at the same time activating the LED and a signal on the display If the compressors are called the activation of an alarm on one compressor sends the call to another compressor The alarm information appears is displayed alternating with the value read by the control probe If more than one alarm is active the information appears on the display in sequence If the alarm situation is resolved the relay is reset and the alarm message is cancelled In the case of alarms with manual reset the Reset Alarms parameter A19 needs to be accessed The alarm from dig
40. lation use or impossibility to use the product even if CAREL or its subsidiaries are warned of the possibility of such damage DISPOSAL SR INFORMATION FOR USERS ON THE CORRECT HANDLING OF WASTE ELECTRICAL AND ELECTRONIC EQUIPMENT WEEE In reference to European Union directive 2002 96 EC issued on 27 January 2003 and the related national legislation please note that 1 2 3 4 WEEE cannot be disposed of as municipal waste and such waste must be collected and disposed of separately The public or private waste collection systems defined by local legislation must be used In addition the equipment can be returned to the distributor at the end of its working life when buying new equipment The equipment may contain hazardous substances the improper use or incorrect disposal of such may have negative effects on human health and on the environment The symbol crossed out wheeled bin shown on the product or on the packaging and on the instruction sheet indicates that the equipment has been introduced onto the market after 13 August 2005 and that it must be disposed of separately In the event of illegal disposal of electrical and electronic waste the penalties are specified by local waste disposal legislation ET NO POWER amp SIGNAL I CABLES TOGETHER READ CAREFULLY IN THE TEXT WARNING separate as much as possible the probe and digital input signal cables from the cables carrying inductive loads and power cab
41. les to avoid possible electromagnetic disturbance Never run power cables including the electrical panel wiring and signal cables in the same conduits CONTENTS I 1 1 1 2 2 2 1 2 2 3 3 1 3 2 3 3 4 4 1 42 43 4 4 45 46 47 48 PROD E E N 7 ETA A a e E O E A a S E OE A 7 E EE H USER INTERFACE eisereen 8 Butons LEDs TET EAE rino e AEE E 8 ebe EE ee EE g STARTING Na 10 Starting for the first MIE Kis ist ti datada eased rad Mi eased ech Da et dee 10 gei DC le 10 Mean ONE impus OU A geet SEENEN 10 COMPRESSOR MANAGEMEN Tis 13 Se TINGS A IE EET E N ET E enee ee eet dede 13 Compressor rotation EE alici eh RA eeh wee nee ee EA 13 OH EE 13 Number of compressors started with probe 1 fault 14 Compressors with different capacities ie 15 Manually enable disable the Compr ssors uit ENEE EENEG tintin 15 ei ER HE 16 Compressor TIME SES ee eebe EE nt GEELEN SE Geer Se See 16 FAN AND INVERTER MANAGEMENT o ocios n a 18 Fan Managementis dio a td a a da te PA data 18 D ad band control c areale ae 18 Inverter managements senais ale aaacasa eroe 19 OO RRE TEE 21 FlOATING Condenser COMO EE 21 VARIOUS SETTINGS cui A a a IE ais 22 Manual device Operation RER E eae eee EE 22 Compressor hour counter and maintenance alarm nn 22 SET point Variatlon TOM dgtalinput EE 22 INpe ofrefrigerantisizicoranora O 22 AUixiliatysprobe managements E O AO 22 Prevent high discharge pressure tier Rue O Lei
42. n Fw release 2 3 The FW release has changed from 2 2 a 2 3 New types of units have been added to increase the product portfolio with the introduction of single circuit and two circuit units with capacity control the time between activation of capacity control steps is fixed 5 seconds The following parameters have been modified 01 Range extended from 0 8 to 0 14 Two integer variables have been added visible to supervisor only int 65 Operating percentage of first capacity controlled compressor in configurations 01 9 10 11 12 13 and 14 int 66 Operating percentage of second capacity controlled compressor in configurations 01 9 10 11 12 13 and 14 CAREL reserves the right to make modifications or changes to its products without prior notice Cod CAREL 03P220431 rel 2 3 dated 06 06 12 42 CAREL CAREL INDUSTRIES HOs Via dell Industria 11 35020 Brugine Padova Italy Tel 39 049 9716611 Fax 39 049 9716600 http Awww carel com e mail carel carel com Cod 03P220431 prack Rel 2 3 06 06 12
43. n or equal to point STPM DTNZ same call time as Min off time N B To make the device call time constant in the activation phase simply set the times TOnMax and TonMin to the same value The same is true for the deactivation phase 4 4 Number of compressors started with probe 1 fault In the event of a suction probe fault or not connected alarm parameter 07 indicates the number of outputs compressors and capacity control configured with capacity controlled compressors forced on so as to ensure minimum cooling operation of the installation For two circuits the parameter relating to the second circuit 08 must also be set This will be related to the probe in the 2nd circuit Cod CAREL 03P220431 rel 2 3 dated 06 06 12 14 Rack 45 Compressors with different capacities Parameter 02 is used to choose the option of compressors with different capacities This allows more load steps and therefore finer control Once the capacity of the individual compressors has been defined parameters 03 04 05 06 the software based on the requirements of the installation and the compressors available without alarms or timers will calculate the most suitable combination to satisfy the requirement Whenever the requirement changes the software recalculates the most suitable combination The combination will always be greater than or equal to the requirement If two compressors have the same capacity the compressor with the lower index
44. ng the advantage of being compact and offering low cost solutions These are compressor racks with only the condensing section and with fan speed managed by the speed controller or external pressure switches and separate management of the compressors in the MT and LT units Below is an example diagram Ible circuit apressor unit sceiver Fig 4 e This type of system can be controlled by pRack in the following conditions 1 the compressors must have the SAME CAPACITY 2 the max number of compressors in the MT unit and LT unit is 4 There can therefore be combinations of 2 2 3 1 1 1 One compressor rack will be allocated to probe LP1 and the other compressor rack to probe LP2 4 7 2 Probes and values controlled Function Input Code on display Type of unit A Single circuit compressor rack B Compressor racks with 2 circuits MT BT Low pressure circuit 1 B4 pressure LPI A B Low pressure circuit 2 B1 pressure LP2 B High pressure circuit discharge B1 pressure HP A press temp B2 temperature B only temp Temperature 1 B2 temperature B2 AUX probe B not used Temperature 2 B3 temperature B3 Always present Tab 4 b 4 8 Compressor time settings The following is a list of all the time parameters used for compressor management and not capacity control Time between stop requests with HP prevent active Parameter C06 sets a stop delay between one compressor and the next if the high pres
45. nimum compressor ON time Co1 R W 9 Minimum compressor OFF time C02 R W 0 Minimum time between starts of different compressors C03 R W 1 Minimum time between starts of the same compressor C05 R W 2 Reserved R W 3 Reserved R W 4 Liquid level alarm delay A18 R W 5 Reserved R W 6 Number of compressors on in circuit 1 with probe damaged 107 RW 7 Number of compressors on in circuit 2 with probe damaged 108 RW 8 Number of fans on with probe damaged 12 R 9 Firmware release RW 20 Type of refrigerant 35 RW 21 Capacity of compressor 1 103 R W 22 Capacity of compressor 2 04 R W 23 Capacity of compressor 3 05 R W 24 Capacity of compressor 4 06 R 25 Inverter readout 11 RW 26 Multifunction DI configuration W I RW 27 B1 type probe 16 Cod CAREL 03P220431 rel 2 3 dated 06 06 12 35 Rack Flow Index Description Parameter RW 28 B2 type probe 21 R W 29 B3 type probe 22 RW 30 Delay restart after black out 137 RW 31 Min time between two stop calls for different compressors C04 RW 32 Time between compressor stop call with Prevent function C06 R W 33 Operating hour threshold for maintenance C07 R 34 Compressor 1 hours C08 R 35 Compressor 2 hours C10 R 36 Compressor 3 hours C12 R 37 Compressor 4 hours
46. nt 1 0 bar rol Differential 2 0 bar r02 Compl 5 WW 03 Comp2 7 kw 04 Comp3 15 WW 05 Maximum capacity 27 kw 06 Pressure Requirement kW Comp Comp2 Comp3 Total active capacity kW 1 1 135 X 5 1 6 8 1 X X 12 1 8 10 8 X X 12 2 13 5 X 15 2 1 14 85 X 15 24 18 9 X X 20 2 5 20 25 X X 22 3 27 X X X 27 Tab 4 a 4 6 Manually enable disable the compressors A compressor can be temporarily disabled from the control sequence This function is very useful when needing to perform maintenance on an individual compressor The corresponding alarms are still managed The following parameters are used M01 M02 M03 M04 to enable the manual operation of the compressors The real manual function is managed using parameters M05 M06 M07 M08 On unit models with capacity control 01 9 10 14 the compressors cannot be manually enabled disabled directly To exploit parameters M01 M08 the unit model needs to be changed 01 1 for configurations 9 10 and 11 01 3 for configurations 12 and 13 01 4 for configuration 14 Cod CAREL 03P220431 rel 2 3 dated 06 06 12 15 Rack 4 7 Special MT LT units 4 7 1 Management of compressor racks with LT and MT circuits and condenser only The hardware features of the Rack controller can be adapted for the control of a special type of compressor rack that is becoming more widely used in small and medium installations havi
47. o 20 0 0 5 Compressor set point circuit 2 R W U 103 Compressor set point second circuit bar C ri4torl5 1 0 For two circuits only SE differential circuit RW U 104 Compressor differential second circuit bar C Oto 20 0 0 5 For two circuits only 0 No rotation Compressor rotation RW C ros Type of compressor rotation 1 FIFO I For single circuit only 2 Time Type of compressor control Compressor control RW C 106 n ens 0 2 1 2 Dead band with time Mist call time startin dead RW r07 Set minimum call time for compressor starts in dead band s C03 to r08 20 Only i dead band band control is enabled Max call time start in dead RW r08 Set maximum call time for compressor starts in dead band S r07 to 999 60 Only ee balla band control is enabled EE RW r09 Set minimum call time for compressor stops in dead band S Oto r10 10 Oniyi gead pana band control is enabled Max call time stop in dead RW r10 Set maximum call time for compressor stops in dead band S 0 to 999 60 Only i dead band band control is enabled Dead band differential EE ae A i pressure in which the time RW 1 o Pressure differential in which the compressor start stop time is proportional bar 17 200 05 Only i dead band y to the suction pressure control is enabled varies Min compressor set point R W C ri2 Set the lower limit of the compressor set point circuit 1 bar 17tor13 0 1 Max compressor set point RW C r13 et the upper limit of the compress
48. oating control can operate ATTENTION enabling this controller the parameters r16 ventilation set and r18 inverter ventilation set are no more visibile since the relevant set point become function of the external temperature delta The following parameter are displayed in temperature always not depending by used probe pressure or temperature r17 Set the minimum value of suction probe r19 Fan inverter differential r25 Set the lower limit of the fan set point r26 I Set the upper limit of the fan set point Cod CAREL 03P220431 rel 2 3 dated 06 06 12 21 Rack 6 Various settings 6 1 Manual device operation The individual devices can be activated manually ignoring the times and the rotation and independently from the temperatuire control functions by setting the related parameters Mxx The only support provided in manual operation is the alarm management function The manual activation of the speed controllers sets the corresponding outputs to the maximum value When even just one manual procedure is enabled the MANUFACTURER icon on the display will FLASH If switching the board off and on again the function is terminated Important Use this function with care Operating the devices manually may cause damage to the installation 6 2 Compressor hour counter and maintenance alarm Parameter C07 is used to set the alarm threshold for the maintenance of the 4 compressors This parameter is expresse
49. ol features the definition of a dead band to the side of the set point within which no device is started or stopped The devices are activated when the measured value exceeds the limit to the right measured value greater than SP DZN see Figure 4 3 The number of devices to be activated varies according to the time elapsed outside of the dead band The first device will start immediately while the others will wait the set time between starts r07 Similarly the devices are stopped when the measured value falls below the dead band measured value less than the set point and remains there for a period equal to the time between device stop requests In this case too the first device stops immediately while the others wait the delay time between stops r09 Cod CAREL 03P220431 rel 2 3 dated 06 06 12 13 Rack Also see the paragraph on Time settings The program will switch the devices on according to the start up logic configured and the availability of the devices Key DOff Device deactivation zone DOnZ Device activation zone NZ Dead band DZN Dead band differential RP Suction pressure read Fig 4 b SP Set point Compressor dead band with variable times The user can decide to set a variable time between calls depending on whether the pressure is moving away from the dead band In particular the activation deactivation time of the outputs decreases as the distance from the dead band increases To set this function the followin
50. or set point circuit 1 bar r12 to 19 93 ee set pomt R W C r14 Set the lower limit of the compressor set point circuit 2 bar 18 to r15 0 1 For two circuits only DI pressor set point R W C r15 Set the upper limit of the compressor set point circuit 2 bar r14 to 20 10 For two circuits only E bar 15 5 i nta Fan set point RW U ip Fansetpoint oC r25 to r26 357 For single circuit only Fan differential RW U r17 Fan differential gt Go ay For single circuit only bar 15 5 Only if the inverter is Inverter set point R W U r18 Fon inverter set point C 125 to 126 357 enabled Cod CAREL 03P220431 rel 2 3 dated 06 06 12 30 Rack Parameter Type Pos Display Description UOM Range Default Notes y d bar 0 to 20 0 3 Only if the inverter if Fan inverter differential RW U r19 Fan inverter differential c 0 to 20 0 18 enabled Type of fan rotation Fan rotation R W C r20 0 NO ROTATION 0 1 1 For single circuit only 1 FIFO Type of fan control 0 Proportional y Se Fan control RW CI 21 1 Proportional integral 0 to 2 0 For single circuit only 2 Dead band Integral time P only R W C r22 Integral time with P control S 0 to 999 600 Only if PI Time between fan start call R W C r23 Minimum time between two succe
51. owable number of starts per hour is 10 to guarantee this limit simply set a value of 360 parameter C05 R Key R Compressor call i Ts Cmp Compressor Cmp TSameSw Minimum time between starts of the same compressor i T Time EE gt Tm TSameSw Fig 4 1 Cod CAREL 03P220431 rel 2 3 dated 06 06 12 17 Rack 5 Fan and inverter management Inputs used e Discharge pressure temperature probe e Digital inputs for the fan safety devices e Multifunction input for generic alarm general discharge pressure switch Outputs used e Condenser fan outputs e Condenser fan speed control PWM output 5 1 Fan management The operation of the fans depends on the value read by the discharge pressure or temperature sensor One thermal overload is featured for each fan step This has a settable immediate reset and will only be valid for the specific fan In the default configuration proportional band control is set parameter r21 and FIFO rotation parameter r20 5 1 1 Fan control Proportional band Proportional band control calculates based on various parameters SP DF and the number of devices set the points where the devices must switch on and off inside the differential band Figure 5 1 shows the activation points for a system with 4 steps Setting the parameters listed above each individual step will have a differential as follows SP 1 DF No of steps for the first SP 2 DF No of steps for the second
52. probe calibration RW 1 26 Outside probe calibration SE 12 to 12 Probe displayed as default 0 probe BI Display probe R W U 27 1 probeB2 0t03 3 2 probe B3 3 probe B4 Logic of the alarm relay Alarm relay logic RW C 28 0 NC 0 1 1 If alarm relay enabled 1 NO Type of thermal overload generic alarm reset relating to the individual T th compressor Automatic when the alarm stops the compressor starts again YP EO COMPILES or ulerma RW C 29 Displayed only if the parameters are enabled 0 1 1 overload alarm reset E 0 AUTO 1 MANUAL Type of thermal overload generic alarm reset relating to the individual fan Automatic when the alarm stops the fan starts again Displayed only if the Type of fan thermal overload R W C 30 parameters are enabled 0 1 1 alarm reset 0 AUTO 1 MANUAL Type of general discharge 7 n Oa high pressure switch reset DI i itch reset NU pressure swi 1 MANUAL Prevent high discharge che pressure R W C 32 Enable high discharge pressure prevention 0 1 0 Set point R W C 33 Hab discharge pressure prevention set point bar 0 to 45 0 18 0 If prevent enabled Type of refrigerant used 0 No refrigerant 1 R22 2 R134a 3 R404a 4 R407c Refrigerant conversion R W C 7 35 15 R410a Oto 11 3 6 R507 7 R290 8 R600 9 R600a 10 R717 11 R744 Serial address Rw c pe Supervisor configuration Identification number of the Rack board for the 1 to 200 1 supervisor serial network
53. rel 2 3 dated 06 06 12 41 ue has been changed from 0 to 17 min value of suction probe B4 min value of setpoint 1 0 bars ue has been changed from 0 to 17 min value of suction probe B4 min value of setpoint 1 0 bars ue has been changed from 0 to 18 min value of probe B1 min value of setpoint2 1 0 bars be B1 The times for the fans in the dead zone also apply to the proportional band ZN only indication removed The times for the fans in the dead zone also apply to the proportional band ZN only indication removed be B1 be B4 be B1 Rack 21 Appendix Changes introduced in Fw release 2 1 The latest FW release has changed from 2 0 to 2 1 Modifications have been made to the following strings arranging of Speed Up Inverter mode and calculation of minimum and maximum speed inverter arranging of Floating condenser control change of alarm delay to start up now more than the value of the DELAY_START parameter is included the delay imposed by their relative parameter 22 Appendix Changes introduced in Fw release 2 2 The FW release has changed from 2 1 to 2 2 The display of variables relating to fan set point has been corrected when the floating condensing function is enabled and a condensing pressure probe is used The Suction Probe1 Alarm Suction Probe1 Alarm and Discharge Probe Alarm alarms have changed from manual to automatic reset 23 Appendix Changes introduced i
54. ress Fig 7 b Cod CAREL 03P220431 rel 2 3 dated 06 06 12 25 Rack 8 The supervisor network uRack can be connected to the most common supervisory systems using suitable interface boards and protocols In particular the following data is exchanged with the supervisor e The status of the inputs outputs e The status of the devices enabled e Alarms present and active e Enabling of the devices various settings etc In addition this function allows the possibility to modify a series of parameters from the supervisor such as set point differentials times unit status reset alarms etc Also see the paragraph Supervisor communication variables 8 1 Serial boards For connection to supervisory systems the control uses the standard CAREL RS485 serial protocol Serial connection options Product code RS485 serial option Code Notes MRK0000000 MCH2004850 External option connected by cable to Rack compact MRKO0000D0 FCSERO0000 Serial output board for DIN version to be fitted in the instrument MRKOOOOADO en uRack with serial option FCSER00000 already FITTED by CAREL Tab 8 a 8 2 Communication protocols Communication protocol CAREL To enable the correct operation of the communication protocol as well as installing the board a number of parameters need to be set such as the identification number parameter 36 Each controller must have the address set so that e There are NO other devices with the same
55. riac and Min triac to zero Increase Max triac until the fan operates at a speed considered sufficient make sure that after having stopped it it starts rotating if left free Copy this value to the Min triac parameter this sets the voltage corresponding to the minimum speed Connect a voltmeter set for 250 V AC between the two L terminals the two external contacts Increase Max triac until the voltage stabilises at around 2 Vac inductive motors or 1 6 1 7 Vac capacitive motors Once the optimum value is found it should be seen that even when increasing Max triac the voltage no longer decreases Do not increase Max triac any further so as to avoid damaging the motor 9 Set the force inverter parameter back to AUTO The operation is now complete Ed ON En sr OAS 5 5 Floating condenser control If this function is enabled using parameter r32 the following parameters need to be set a DELTA T r33 condenser exchanger parameter typically related to the type of condenser used b Minimum condensing pressure r25 in C Maximum condensing pressure r26 in C The condenser set point is the value resulting from DELTA T Outside air temperature as with high outside temperatures the condensing temperature cannot be too low no possibility of energy savings This is used to optimise the operation of the fans The maximum and minimum pressure values are the range in which fl
56. rmal overload generic NO 3 2 2 Unit ON OFF The controller is normally configured as always ON The unit can be switched on and off by 1 Alarm parameter A22 can be used to select whether or not a broken probe alarm should switch the unit off 2 Supervisor parameter 38 can be used to enable unit shutdown from the supervisor 3 Digital input parameter 15 can be used to configure the multifunction input as ON OFF 4 Parameter parameter 39 can be used to switch the unit on or off Shutting down the unit as shown on the display by the message OFF D switches the controller off e stops the management of the various devices and the related alarms 3 3 Meaning of the inputs outputs 3 3 1 Table of analogue inputs The tables below describe the type of the probes that can be connected to the inputs and their characteristics Analogue inputs Input Description Type of probes that can be connected BI Ratiometric discharge pressure probe RATIOMETRIC pressure probe 0 to 5 Volt or NTC if 16 B2 Room temperature probe display auxiliary probe CAREL NTC temperature probe 50T100 C R T 10 k at 25 C B3 Outside air temperature probe floating condenser control auxiliary probe CAREL NTC temperature probe 50T100 C R T 10 k at 25 C B4 Ratiometric suction pressure probe probe in 2nd circuit RATIOMETRIC pressure probe 0 to 5 Volt Tab 3 a Cod CAREL 03P220431 rel 2 3 dated 06 06 12 10 Rack Digital inputs Input T
57. rom 999 hours x 10 to 320 hours x 100 The following r parameters have been modified r01 The min value is now r12 The max value is now r13 r03 The min value is now r14 The max value is now r15 r11 The min va r12 The min va r13 The default value has been changed from 2 5 bars to 9 3 bars The max value has been changed from 40 bars to 19 r14 The min va r15 The max value has been changed from 40 bars to 20 m The default value has been changed from 2 5 bars to 10 bars r17 The default value has been changed from 0 5 bars 3 C r19 The default value has been changed from 0 5 bars 3 C 123 124 r26 The max value has been changed from 40 bars to 20 m The following A parameters have been modified A01 The default value has been changed from 4 bars to 9 3 ba The max value has been changed from 40 bars to 19 m A03 The default value has been changed from 0 5 bars to O ba A05 The default value has been changed from 4 bars to 9 3 ba The max value has been changed from 40 bars to 20 m A07 The default value has been changed from 0 5 bars to 0 ba A09 The max value has been changed from 40 bars to 20 A10 The default value has been changed from 10 bars 20 C The min value has been changed from 0 bars 0 C to 18 50 C A18 has been changed from seconds to minutes The default value has been changed from 90 sec to 60 mi The max value has been changed from 999 sec to 500 min Cod CAREL 03P220431
58. s of RW C C04 Minimum time between two stop calls for compressors s 0 to 999 10 different compressors Min time between starts of R W C C05 Minimum time between two effective starts of the same compressor s 0 to 999 360 same compressor Time between compressor Se Only if OFF call with prevent active R W C C06 Time between compressor stop call with high pressure prevention active s 0 to 999 30 prevent active Compressor operating hour 3 threshold Tor maintenance RW c07 eee e hour threshold for maintenance alarm If set to 0 no hx1001 0 to 320 0 alarm i Compressor 1 operating hours R C08 Display compressor 1 operating hours hx100 Oto 320 0 Reset compressor 1 operating hours Gr min SE 1 RESET Compressor 2 operating hours R C10 Display compressor 2 operating hours hx 100 Oto 320 0 Reset compressor 2 operating hours e RW CI 0 No RESET on 0 operating hours 1 RESET Compressor 3 operating hours R C12 Display compressor 3 operating hours hx100 Oto 320 0 Reset compressor 3 operating hours RESET Compressor 3 RW C13 0 NO RESET on 0 operating hours 1 RESET Compressor 4 operating hours R C14 Display compressor 4 operating hours hx 100 Oto 320 0 Reset compressor 4 operating hours deeg 7 RW C15 0 NO RESET 0 1 0 1 RESET Control menu Compressor set point circuit 1 RW U 101 Compressor set point first circuit bar C ri2tor13 1 0 Ga differential circuit RW U 102 Compressor differential first circuit bar C Ot
59. setting Prg Press the two buttons together for 5 seconds to set the PWD for accessing the MANUFACTURER parameters and thus configuring the controller Sel HP A Press the two buttons together when the numeric value of one of the following parameters is displayed LP bar 1 comp fan set point v C 2 high low threshold to switch the display of the same parameter from BAR to C Tab 2 a Cod CAREL 03P220431 rel 2 3 dated 06 06 12 8 Rack 2 2 LED display and Icons The display shows the control value temperature or pressure depending on the selection made from the keypad In the event of alarms the display shows the monitored and the alarm information in sequence D A LP Description On when the unit of measure selected is BAR On when the unit of measure selected is C On when there is an ACTIVE ALARM 1 On when the MANUFACTURER parameters are being configured 2 If flashing with the ALARM icon indicates the compressor maintenance hours have been exceeded 1 On when the value read by the suction probe is displayed 2 If flashing with the ALARM icon indicates the activation of suction probe alarms High Temp Low Temp Probe not connected 1 On when the value read by the discharge probe is displayed 2 If flashing with the ALARM icon indicates the activation of discharge probe alarms High Temp Probe not connected 1 On when the fan parameters are being configured 2 On when a
60. sor and fan dead band management Possibility to enter the compressor set point in BAR and display the value in C by pressing the UP and DOWN buttons together when displaying the parameter values 9 Possibility to enter the fan set point in BAR or degrees centigrade depending on the control probe used pressure or NTC 10 Multifunction input general HP alarm ON OFF change SET POINT 11 Set point variation from digital input 12 Possibility to set the compressor fan thermal overload generic alarm as automatic manual 13 Enable compressors from the Maintenance screen 14 Proportional plus integral function for the fan inverter 15 Floating condenser set point 16 Optional temperature probes with high temperature alarm threshold a Outside air b Ambient air c Compressor discharge temperature d Suction temperature GLEN NOTES Oe 1 2 Main characteristics Main functions Control of compressor suction pressure Control of condensing pressure compressor discharge Complete management of the outputs available Complete alarm management e Connection to serial line for supervision telemaintenance Devices controlled Compressors up to 4 hermetic compressors no part up to 2 hermetic load capacity controlled compressors e Condenser fans max 4 e PWM speed control Programming Display and control of the values measured on LED display Three levels of parameter protection SEL USER PRG INSTALLER SEL
61. sp DF for the last Key SP Fansetpoint DF Fan differential RP Pressure read Fig 5 a 5 2 Dead band control This type of control features the definition of a dead band to the side of the set point within which no device is started or stopped The devices are activated when the measured value exceeds the limit to the right measured value greater than SP DZN see Figure 5 2 The number of devices to be activated varies according to the time elapsed outside of the dead band The first device will start immediately while the others will wait the set time between starts Similarly the devices are stopped when the measured value falls below the dead band measured value less than the set point and remains there for a period equal to the time between device stop requests In this case too the first device stops immediately while the others weit the delay time between stops The program will switch the devices on according to the start up logic configured and the availability of the devices Key DO Device deactivation zone DA NZ Dead band DOnZ Device activation zone semer ee DZN Dead band differential RP Discharge pressure read Fig 5 b SP Fan set point Fan rotation The rotation of the fans settable by parameter r20 is aimed at balancing the number of operating hours and starts of the different fans Rotation automatically excludes any fans with active alarms If the fan is off for alarm or disabled is excluded
62. ssive calls to start different fans s 0 to 999 2 x Time between fan stop call R W C r24 Minimum time between two successive calls to stop different fans s 0 to 999 2 XX d SR 3 bar 0 to 126 1 0 Min fan set point RW C r25 Set the lower limit of the fan set point c 60 to DE 312 Ge bar 125 to 40 0 25 0 Max fan set point R W C Op Set the upper limit of the fan set point C r25 to 150 553 Fan inverter speedup time RW C r27 Fan inverter speedup time s 0 to 999 2 ony Ge SZ Inverter ramp up time R W 1 128 Set the time taken by the inverter to reach full load s 0 to 999 10 Only A SZ Minimum fan inverter output R W C 129 Get the minimum operation of the fan inverter 0 to 130 0 SH SE re Maximum fan inverter output R W C r30 Set the maximum operation of the fan inverter 129 to 100 100 SE Gees SCH Triac impulse duration R W C r31 Duration of the impulse applied to the triac ms Oto 10 0 Only ee one Enable the floating condenser control ae floating condenser RWw c 12 mu 0to1 0 1 YES Condensing Delta T R W C r33 Temperature difference for floating condenser control 40 to 150 10 Compressor management Compressor bar auxiliary set point offset gt offset set point RAW ea Used when changing the set point from digital input CO i Alarm menu HP suction 1 alarm R W A01 Suction probe 1 alarm high threshold setting bar A03 to 19 ER HP suction 1 delay R W A02 Suction probe 1 alarm delay setting S 0 to 999 60 LP suc
63. st capacity control activated will be the last deactivated e Start C1 C2 C3 C4 e Stop C4 C3 C2 C1 FIFO rotation The first compressor to start will be the first to stop e Start C1 C2 C3 C4 e Stop C1 C2 C3 C4 This selection enables the rotation of the compressors so as to even out as much as possible the number of compressor operating hours Rotation by time The compressor that starts will be the one with the lowest number of operating hours When stopping the exact opposite is true that is the compressor with the highest number of operating hours will stop 4 3 Compressor control In the default configuration dead band control is activated parameter r06 Proportional band Proportional band control calculates based on various parameters SP DF and the number of devices set the points where the devices must switch on and off inside the differential band Parameters r01 set point r02 differential Figure 4 1 shows the activation points for a system with 4 steps Setting the parameters listed above each individual step will have a differential as follows SP 1 DF No of steps for the first SP 2 DF No of steps for the second ep DF for the last compr capac contr compr capac contr 1 compr compr capac ON lit im SESCH narnia Key SP Compressor set point 101 OFF DF Compressor differential r02 DF RP RP Pressure read lt SP Fig 4 a Dead band This type of contr
64. sure prevention prevent function is active This applies both in the dead band and in the proportional band Minimum compressor ON time Sets the minimum time the compressors stay on that is once activated must remain on for the time set by this parameter parameter C01 R Key R Compressor call TS Cmp Compressor Cmp TMinOn Minimum ON time T Time KEE T s TMinOn Fig 4 f Cod CAREL 03P220431 rel 2 3 dated 06 06 12 16 Rack Minimum compressor OFF time Sets the minimum time the compressors stay off The devices are not started again if the minimum time selected parameter C02 has not elapsed since the last stop Key R R Compressor call Cmp Compressor TMinOff Minimum OFF time T Time Minimum time between starts of different compressors proportional band This represents the minimum time that must elapse between the start of one device and the next This parameter allows simultaneous starts to be avoided parameter C03 Key R R Compressor calls Cmp1 Compressor 1 Tis Cmp2 Compressor 2 Cmp1 TDiffSw Minimum time between starts of different compressor T Time TDiffSw Fig 4 h With capacity control compressors is established fixed delay 5 s between a capacity control and the following Minimum time between starts of the same compressor Sets the minimum time that must elapse between two starts of the same compressor This parameter limits the number of starts per hour If for example the maximum all
65. t least one fan is operating 3 If flashing with the ALARM icon indicates the activation of fan alarms 1 On when the compressor parameters are being configured 2 On if at least one compressor step is active 3 If flashing with the ALARM icon indicates the activation of the compressor alarms 1 Indicates the state of the compressors and capacity control on 2 If flashing indicates the ON OFF call for a new compressor step while the device is awaiting the expiry of the delay times 3 If the controller is used for fan control only 01 0 then the icon shows the status of the fans Tab 2 b Cod CAREL 03P220431 rel 2 3 dated 06 06 12 9 Rack 3 Starting the unit 3 1 Starting for the first time After having checked the connections power up the unit When started for the first time the controller performs a LAMP TEST and uses the default values selected by CAREL for all the configuration parameters Unit with 2 compressors 2 fans alarm relay 3 2 Unit configuration The unit can be set as single or two circuit the number of compressors for one or two circuits using parameter 01 the number of fans can then be set using parameter 09 The maximum number of devices compressors fans is 5 maximum number of relays First the compressors capacity control and then the fans will be allocated in sequence Relay no 5 may be e analarm e afan The selection is made automatically according to the number of
66. the status of the signal devices changes as follows e The alarm relay changes to normal status e Red ALARM LED goes off If on the other hand the cause of the alarms is still present the initial situation will return 7 3 Semiautomatic alarms The low pressure alarm from transducer is a semiautomatic alarm It acts as an alarm with automatic reset however if it is activated at least 3 times within a set time default 10 minutes it becomes an alarm that must be reset manually that is using parameter A19 This alarm obviously causes the unit to shutdown 7 4 Alarm relay Based on the configuration no of devices lt 5 relay no 5 multifunction can be used as an alarm relay A delay time can be set parameter A20 between the activation of an alarm and the change in the status of the signal relay If the time is set to 0 the activation of the alarm relay is immediate Code Alarm description Generated by Action performed Type of reset Delay Notes A01 Compressor 1 DI Comp 1 OFF Settable Settable A02 Compressor 2 Comp 2 OFF Settable A09 Liquid level from multifunction input manual settable General suction pressure switch 1 D 3 A10 Pee COMP OFF CIRC 1 automatic no from multifunction input G sucti itch 2 y ns e COMP OFF CIRC 2 automatic no from multifunction input G disch itch Al2 uence ocean erties KN All comps OFF Settable no from multifunction input A13 Low
67. ther for more than 5 seconds MANUFACTURER mute Sel THIS PASSWORD OFFERS THE POSSIBILITY OF DISPLAYING ALL PARAMETERS THE PARAMETERS FOR PROGRAMMING THE UNIT AND CHANGING THE LEVEL OF PROTECTION Tab 10 a Structure of the parameters in synoptic chart LP1 S P and L P LP2 parameters C S P Set Parameters HP ale L P Level Parameters 2 LP A 3 visibility M q Pressing PRG for 3 seconds returns to the main synoptic Fig 10 a Table of parameters Parameter Type Pos Display Description UOM Range Default Notes Configuration menu Set the type of unit LT MT or two circuit 0 LT 1 MT 2 TWO CIRCUIT Type of unit RW C 00 0to2 0 Cod CAREL 03P220431 rel 2 3 dated 06 06 12 27 Rack Parameter Type Pos Display Description UOM Range Default Notes Unit model 01 Set the unit model without capacity control SINGLE CIRCUIT 0 0 compressors 1 compressor 2 2 compressors 3 3 compressors 4 4 compressors TWO CIRCUIT 5 1 compressor 1 compressor 6 2 compressors 1 compressor 7 3 compressors 1 compressor 8 2 compressors 2 compressors Set the unit model with capacity control SINGLE CIRCUIT 9 1 compressor 1 capacity control 10 1compressor 2 capacity control 11 1 compressor 3 capacity control TWO CIRCUIT 12 1 compressor 1 capacity control 1 compressor 13 1 compressor 1 capacity control 1 compressor 1
68. tion BI Analogue input 1 Discharge pressure probe B2 Analogue input 2 Ambient air temperature probe B3 Analogue input 3 Outside air temperature probe B4 Analogue input 4 Suction pressure probe Tab 15 a Signal Type of analogue outputs Description Y PWM analogue output Fan inverter Tab 15 b Signal Type of digital inputs Description IDI N C digital input no 1 Comp 1 thermal overload ID2 N C digital input no 2 Comp 2 thermal overload ID3 N C digital input no 3 Fan 1 thermal overload ID4 N C digital input no 4 Fan 2 thermal overload ID5 N C digital input no 5 General high pressure switch Tab 15 c Signal Type of digital outputs Description NOI Normally open contact relay no 1 Compressor 1 NO2 Normally open contact relay no 2 Compressor 2 NO3 Normally open contact relay no 3 Fan 1 NO4 Normally open contact relay no 4 Fan 2 NO5 Normally open contact relay no 5 Generic alarm Tab 15 d Cod CAREL 03P220431 rel 2 3 dated 06 06 12 36 16 Glossary Rack Analogue value integer value with minus sign and decimal point Buffer memory memory on the board used to save the default values selected by CAREL for all the parameters Permanent memory saves the values even when power is disconnected Buzzer buzzer fitted on the external terminals this sounds in the event of alarms or the limits set for the parameters are exceeded The Built in terminals do not have a buzzer Digital value value with only two states Differentia
69. tion 1 alarm R W A03 Suction probe 1 alarm low threshold setting bar 17 to A01 0 LP suction 1 delay R W A04 Suction probe alarm delay setting S 0 to 999 60 HP suction 2 alarm RW A05 Suction probe 2 alarm high threshold setting bar A07 20 93 For two circuits only HP suction 2 delay R W A06 Suction probe 2 alarm delay setting s 0 to 999 60 LP suction 2 alarm R W A07 Suction probe 2 alarm low threshold setting bar 18 to A05 0 For two circuits only LP suction 2 delay R W A08 Suction probe alarm delay setting S 0 to 999 60 3 DE bar A10 to 20 20 0 HP discharge alarm R W A09 Discharge probe alarm high threshold setting C Aloto 150 458 3 bar 18 to A09 0 LP discharge alarm R W A10 Discharge probe alarm low threshold setting c 50 to A09 60 Discharge delay R W A11 Discharge probe alarm delay setting s 0 to 999 60 Compressor thermal delay R W 1 A12 Compressor thermal overload alarm delay setting s 0 to 999 0 HP prevention RES E Only if the prevent is Prevent time 1 R W A13 Time in which start calls are ignored after prevent HP m Oto 99 5 enabled HP prevention RW A14 If two prevent alarms occur within this time an excessive prevent frequency i 0 to 999 6 Only if the prevent is Prevent time 2 alarm is generated enabled HP prevention RW Aus If no prevent alarms occur in this period the high prevent frequency alarm is i oto 99 30 Only if the prevent is Prevent time 3 automatically reset enabled e temp probe threshol
70. tput load 1 kW Front panel index of protection IP55 Storage conditions 10T70 C humidity lt 80 r H non condensing Operating conditions 10T50 C humidity lt 90 r H non condensing Degree of pollution Normal Cat of resist to heat and fire D UL94 VO PTI of the insulating materials 2250 V Class and structure of the software A Period of electrical stress across the insulating parts long Functional specifications Resolution of analogue inputs Note All the relays must have the commons C1 2 C3 4 connected together as shown in Fig 1 e 2 Temperature probes range 40T80 C 0 1 C Temperature measurement error Range 20T20 C 0 5 C excluding probe Range 40T80 C 1 5 C excluding probe Pressure measurement error Cod CAREL 03P220431 rel 2 3 dated 06 06 12 The voltage error in the input range of 0 5 to 4 5 Vdc is 2 excluding probe 37 18 Product codes list MRK0000000 uRack panel mounting 32x74 24 Vac with connectors kit MRK00000DO uRack DIN rail mounting 24 Vac with connectors kit MRKOOOOADO Rack DIN rail mounting RS485 preinstalled serial board 24 Vac with connectors kit The connectors kit contains Polarized mini fit connector 2x6 pin female Polarized mini fit connector 2x7 pin female removable terminal right angle female 3 pin pitch 3 81 mm high 11 1 mm removable terminal right angle female 3 pin pitch
71. upplied with the product or can be downloaded even prior to purchase from the website www carel com Each CAREL product in relation to its advanced level of technology requires setup configuration programming commissioning to be able to operate in the best possible way for the specific application The failure to complete such operations which are required indicated in the user manual may cause the final product to malfunction CAREL accepts no liability in such cases Only qualified personnel may install or carry out technical service on the product The customer must only use the product in the manner described in the documentation relating to the product In addition to observing any further warnings described in this manual the following warnings must be heeded for all CAREL products Prevent the electronic circuits from getting wet Rain humidity and all types of liquids or condensate contain corrosive minerals that may damage the electronic circuits In any case the product should be used or stored in environments that comply with the temperature and humidity limits specified in the manual Do not install the device in particularly hot environments Too high temperatures may reduce the life of electronic devices damage them and deform or melt the plastic parts In any case the product should be used or stored in environments that comply with the temperature and humidity limits specified in the manual Do not attempt to open the d
72. will always be the first to start 4 5 1 Proportional band control with different capacity compressors Based on the pressure the set point and the differential the software will proportionally calculate the capacity required to bring the pressure back near the set point At the set point plus differential the requirement will be at the maximum value while it will be null for pressure values around or less than the set point Max_Capacityx Setpoint press Capacity _ required PISA Differential 4 5 2 Dead band control with different capacity compressors The software will calculate the maximum number of combinations possible with the compressors available At certain intervals of time see the paragraph on Compressor dead band with variable times the software will call a sequence with a higher capacity In the deactivation phase the opposite will occur while in the dead band no compressors will be started or stopped An increase in the requirement will correspond to a different combination Key DO Device deactivation zone DOnZ Device activation zone NZ Dead band DZN Dead band differential RP Suction pressure read Fig 4 d SP Set point compressors S2 fans S1 4 5 3 Example of compressors with different capacities The following example looks at an installation featuring 3 compressors with different capacities using proportional band control As can be seen there are 8 possible combinations available Set poi
73. ype of device connected 1D1 Generic compressor fan alarm Voltage free contact 1D2 Generic compressor fan alarm Voltage free contact ID3 Generic compressor fan alarm Voltage free contact ID4 Compressor 4 fan alarm Generic compressor fan alarm Voltage free contact 1D5 Fan alarm Multifunction input Generic alarm compressor fan from general high low pressure switch fan thermal overload liquid level Unit On Off Voltage free contact Tab 3 b Digital outputs Input Type of device connected No1 C1 Power contactor for starting the compressor fan No2 C2 Power contactor for starting the compressor Power contactor for capacity control activation fan No3 C3 Power contactor for starting the compressor Power contactor for capacity control activation fan No4 C4 Compressor 4 capacity control fan Power contactor for starting the compressor Power contactor for capacity control activation fan No5 C5 Alarm fan Power contactor for starting the fan voltage free contact for signalling unit alarm Tab 3 c Analogue outputs Outputs Description YI Fans speed controller PWM Tab 3 d 3 3 2 Wiring diagrams Panel installation EA PSOPZKEY programming key optional board m O dg CONVONOFFO CONV0 10A0 MCHRTF C0 Q PWM digital PWM analogic fan speed Eng converter converter regulator W PY 00

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