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1. Parameter Pos Display Description UOM Range Default Notes Minimum fan inverter i Only if the inverter is 0 output RWI C r29 Setthe minimum operation of the fan inverter Yo 0 to r30 0 Sable Maximum fari inverter RWI C r30 the maximum operation of the fan inverter r29 to 100 100 inverters output enabled Triac impulse duration NW C r31 Duration of the impulse applied to the triac ms 0to 10 0 ony pun Enable the floating condenser control m floating condenser C B2 DNO 001 0 1 YES Condensing Delta T RWI C r33 Temperature difference for floating condenser control 4010 150 10 Compressor management Compressor bar auxiliary set point offset 4 offset set point LANE pa Used when changing the set point from digital input Alarm menu HP suction 1 alarm RW 1 A01 Suction probe 1 alarm high threshold setting bar A03 to 19 93 HP suction 1 delay RW A02 Suction probe 1 alarm delay setting 5 0 to 999 60 LP suction 1 alarm RW A05 Suction probe 1 alarm low threshold setting bar V7 to A01 0 LP suction 1 delay RW A04 probe alarm delay setting 5 0 to 999 60 HP suction 2 alarm RW A05 Suction probe 2 alarm high threshold setting bar A07 20 20 For two circuits only HP suction 2 delay RW A06 Suction probe 2 alarm delay setting 5 0 to 999 60 LP suction 2 alarm RW A07 Suction probe 2 alarm low threshold setting bar 18 to
2. Flow Index Description Display code R 1 Probe B4 LP1 R 2 Probe B1 HP LP2 R 5 Probe B2 ambient air B2 R 4 Probe B3 outside air B5 RW 5 Suction set point circuit 1 ro1 RW 6 Differential circuit 1 02 RW 7 Suction set point circuit 2 103 RW 8 Differential circuit 2 ro4 RW 9 Min suction set point 1 r12 R W 10 Max suction set point 1 r13 R W 1 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 R W 15 Fan differential r17 bar R W 16 Fan differential r17 CC R W 17 Min fan set point r25 bar Cod CAREL 03P220431 rel 2 1 dated 05 07 10 33 Flow Index Description Display code RAW 18 Min fan set point r25 RAW 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 CO R W 23 Fan inverter differential r19 bar R W 24 Fan inverter differential r19 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 thres
3. i et e ER C US EE ROLE A 1 Compressor tme Settgs ec eerta heure que aa t n eH qune edd pRUC E OU e UHREDEO I UE ER 1 FAN AND INVERTER MANAGEMENT cec UEM NNNM ELE Rain MAMAS ele Mo scenes Mc oc LU Meere E 1 Dead band control meae tamem ad adit te uaa mta dendi 1 Inverter management PAMPPMmariagemelt oru Trenes MM EU AI PM ne Floatitig corideniser ee SR LT LIN uU ME IU ID um VARIOUS SERTINGS Manual device Compressor hour counter and maintenance alarm Set point variation from digital input Type f refrigerants isdem Auxiliary probe Preventihigh discharge Pressures innra A AERAR ARE anaq naat sapu awhamu sassa asku asapauhamu M Le LED EE US ALARMIMANAGEMENERRR P 24 Alaris WIth ltOMatl ede irent tame rst etum ater a dra rdi 24 Alarms with manual reset Semiautomatic Alas xn eter yere t rra aen eder parata que onerant ga OG quida deren aba dde date genit nim i ER Pct EE S Alarms from analogue inputs temperature probe and pressure transducer
4. 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 temperature 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 expressed in the hundreds of hours as the resolution of the display is only 5 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 5 digits Parameters C09 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
5. SPKT 0 5 optional board pressure MCH200485 RS485 serial card p KeylSP V e000 suction pressure probe To program key 85555 MCH2004850 discharge option pressure probe l To serial lin k N L TRADR1W04 Cod CAREL 03 220431 rel 2 1 dated 05 07 10 11 lt FCSER00000 RS485 serial card Cla PSOPZKEY programming key optional board CONVONOFFO CONVO 10A0 PWM digital PWM analogic Tan speed Bottom converter converter regulator SPKT 0 5 Vdc pressure transducer p Rack GND Programming key FCSER00000 y 1 GND T T GND B4 V i Jj Sp p ep i 1 569 669 a g M 2 A suction E pressure EJ probe N Om To serial link discharge N Line L lo pressure probe TRADR1W04 Cod CAREL 03P220431 rel 2 1 dated 05 07 10 12 4 Compressor management Inputs used e Suction pressure probe probes e Digital inputs dedicated
6. 452 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 DOff Device deactivation zone DOnZ Device activation zone M Dead band DZN Dead band differential RP Suction pressure read SP Set point compressors S2 fans S1 Fig 4 d 4 5 5 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 point 1 0 bar rO Differential 2 0 bar ro2 Compl 5 kw Jos Comp2 7 kw Jo4 Comp3 15 kw o5 Maximum capacity 27 kw oe Pressure Requirement kW Compl Comp2 Comp3 Total active capacity kW 1 1 1 55 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 15 24 18 9 X X 20 2 5 20 25 X X 22 5 27 X X X 27 4 6 M05 M06 M07 M08 Cod CAREL 03 220431 rel 2 1 dated 05 07 10 Manually enable disable the compressors A
7. AS2 55 55 54 has been replaced by AB2 has been replaced by 5 has been replaced by B2 has been replaced by B3 2 0 its 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 17 18 19 20 29 30 33 34 43 The default value has been changed from 3 to 0 The max value is now 19 The max value is now 20 The default value has been changed from 4 1 bars to 9 3 bars The max value has been changed from 40 bars to 45 bars The max value has been changed from 40 bars to 45 bars The default value has been changed from 1 to 0 The default value has been changed from 1 to 0 The max value is now 45 bars The parameter has been made not visible New p arameter for setting probe B4 The SONDA B4 parameter now is visible and can be set on the display and from the supervisor Setting to 0 means the probe is not used Settings 1 and 2 mean it used as a pressure probe The following C parameters have been modified 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
8. t iti RWI C 02 10 NOT ENABLED 0 1 0 For single circuit only ifferent capacities 1 ENABLED Capacity compressor 1 RW C 03 Capacity of compressor 1 kW 0to 999 5 pear dn Rs Capacity compressor 2 gw C 04 Capacity of compressor 2 kW 03 to 999 10 ea ide 03 04 to Only if with different Capacity compressor 3 RW C 05 Capacity of compressor 3 kw d 9 20 pu EE EIU 03 04 05 Only if with different Capacity compressor 4 RW C 06 gt Capacity of compressor 4 t i md 40 eu Number of compressors If the suction 1 probe fault or not connected alarm is activated this number ber limited by th ON with suction probe1 RW 07 of compressors are started These are in any case managed by the 0104 0 x number compressors fault individual alarms and general pressure switches Number of compressors If the suction 2 probe fault or not connected alarm is activated this number ON with suction probe2 RW 08 of compressors are started These are in any case managed by the 004 0 For two circuits only fault individual alarms and general pressure switches Number limited by the Configure number of fans RW 09 Setthe number of fans 0 to4 2 number of compressors already enabled Enable fan inverter RW C 10 Enable control of the fans with inverter 0 1 0 ISTE output R U 11 Display the inverter output as a percentage 0 to 100 0 If the discharge probe fault or not connect
9. 51 RW 25 Reset compressor 1 hours C09 R W 26 Reset compressor 2 hours CH R W 27 Reset compressor 3 hours C13 R W 28 Reset compressor 4 hours C15 R W 29 Enable floating condenser control 132 R W 30 Enable unit Off due to probe fault A22 R W 31 Enable fans with compressor ON 15 Tab 14 b Cod CAREL 03 220431 rel 2 1 dated 05 07 10 34 Alarms sent to the supervisor Fow Index Description Alarm code R 1 Alarm compressor 1 A01 R 2 Alarm compressor 2 A02 R 3 Alarm compressor 3 A05 R 4 Alarm compressor 4 A04 R 5 Alarm fan 1 A22 R 6 Alarm fan 2 A25 R 7 Alarm fan 5 A24 R 8 Alarm fan 4 A25 R 9 Alarm liquid level A09 R 0 Alarm general low suction pressure 1 A10 from multifunction DI R 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 15 Alarm high suction pressure 1 A16 R 6 Alarm low suction pressure 2 A17 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 25 Compressor
10. MHESSUPERVISOR NETWORK dem 26 Serial 26 Communication protocols das 26 USER INTERFACE 26 LIST OF PARAMETERS 27 ON OFF FAN CONTROL BOARD CODE CONVONOFF0 a titt tette ttt tont ttis 32 PWM TO 10 VDC OR 4 TO 20 MA CONVERSION BOARD FOR FANS CODE 33 PROGRAMMING KEY CODE PSOPZKEYAO a tetto ttt ttt tont ttt 33 SUPERVISOR MANAGEMEN INE E 33 DEFAULT CONFIGURATIONS 36 nom H 37 TEGHINIGAL SPECIFICATION X 37 PRODUCDCODEYLISL n 38 APPENDIX COMPRESSOR RACK CONTROLLER EXAMPLES OF APPLICATION DIAGRAMS 39 APPENDIX CHANGES INTRODUCED IN FW RELEASE 2 0 FOR MRKOQOOOXXO sssesssssssssssssssscccssssssesseesssnssseseessssnusscssssssnssssesessssnssseseesssnnssesseesssnsecseesssnnseseeessnnees 41 1 Product 1 1 General functions Read pressure transducers display data in BAR C depending on the type of
11. 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 SP DF for the last Key SP Fan set point DF Fan differential RP Pressure read SP 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 whe
12. A05 0 For two circuits only LP suction 2 delay RW A08 Suction probe alarm delay setting 5 0 to 999 60 ET A10 to 20 20 0 HP discharge alarm RW A09 Discharge probe alarm high threshold setting 1010150 458 y I bar 18 to A09 0 LP discharge alarm RW A10 Discharge probe alarm low threshold setting 50 to A09 50 Discharge delay RW All Discharge probe alarm delay setting 5 0 to 999 60 mv thermal RW 12 Compressor thermal overload alarm delay setting S 0 to 999 0 HP prevention DONE Only if the prevent is prevent me t RW A13 Time in which start calls are ignored after prevent HP m 0 to 99 5 habled HP prevention RW M4 If two prevent alarms occur within this time an excessive prevent frequency 0 to 999 6 Only if the prevent is Prevent time 2 alarm is generated enabled HP prevention RW M5 If no prevent alarms occur in this period the high prevent frequency alarm m 010 99 30 Only if the prevent is Prevent time 3 is automatically reset enabled High temp probe threshold B2 RW Al6 High temperature threshold probe B2 C 40 to 150 100 High temp probe 5 2 threshold RW A17 temperature threshold probe C 40 to 150 100 Delay liquid level alarm RW A18 Set the liquid level alarm delay from multifunction input m 0 to 500 60 Reset the alarms with manual reset Reset ALARMS RW U A19 0 NO RESET 0 1 0 1 RESET Alarm signal delay A20 Set alarm signal delay 5 0
13. A19 This alarm obviously causes the unit to shutdown 7 4 Alarm relay Based on the configuration no of devices 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 DIN Comp 1 OFF Settable Settable A02 A03 Compressor 3 A04 A05 Compressor 1 maintenance _ be j n A06 Compressor 2 maintenance Sebe n A07 Compressor3 maintenance tbe nm A08 Compressor 4 maintenance _ _ ___ Sbi j n AO9 Liquid level from multifunction input General suction pressure switch 1 COMP OFF CIRC 1 om from multifunction input from multifunction input General discharge pressure switch A13 Low discharge pressure A14 15 16 Cod CAREL 03 220431 rel 2 1 dated 05 07 10 24 Code Alarm description 17 18 9 A20 A21 A22 23 A24 25 26 28 HtE HS bjer m mi mi rm r ie Low suction pressure 2 High suction pressure 2 Suction probe 1 faulty or disconnected Suction probe 2 faulty or disconnected Discharge probe faulty or disconnected Fan 1 the
14. 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 1 3 HP inductive PWM to 0 to 10 Vdc or 4 to 20 mA conversion board for fans code 10 0 The CONV0 10A0 modules convert the PWM signal sent from terminal Y to a standard 0 to 10 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 CONVO0 10A0 or FCS are used the Min triac parameter 129 should be set to zero and the Max triac r30 parameter to the maximum value is the impulse period 131 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 l Set the fan inverter to always On Force inverter parameter M17 Set Max triac 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
15. 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 All 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 RW 62 Time to change low pressure alarm from automatic to manual A21 RW 65 B4 type probe 43 Tab 14 d 15 Default configurations Signal Type of analogue inputs Description Analogue input 1 Discharge pressure probe B2 Analogue input 2 Ambient air temperature probe B5 Analogue input 5 Outside air temperature probe 4 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 101 N C digital input no 1 Comp 1 thermal overload 02 N C digital input no 2 Comp 2 thermal overload 105 N C digital input 5 Fan 1 thermal overload 104 N C digital input 4 Fan 2 thermal overload 05 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 N
16. auxiliary probe CAREL NTC temperature probe 507100 R T 10k 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 1 dated 05 07 10 10 Digital inputs Input 101 Compressor 1 fan alarm ID2 Compressor 2 fan alarm Generic compressor fan alarm Voltage free contact Generic compressor fan alarm Voltage free contact 104 Compressor 4 fan alarm Generic compressor fan alarm Voltage free contact 05 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 5 Digital outputs Input Type of device connected No1 C1 Power contactor for starting the compressor fan No2 C2 Power contactor for starting the compressor fan No3 C3 Power contactor for starting the compressor fan No4 C4 Compressor 4 fan Power contactor for starting the compressor 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 Yl Fans speed controller PWM Tab 5 0 3 3 2 Wiring diagrams Panel installation PSOPZKEY programming key C3 CONVONOFFO CONV0 10A0 MCHRTF CO Q PWM digital PWM analogic fan speed U converter converter regulator 0000 p
17. 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 Tab 4 a 4 7 Special MT LT units 471 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 having 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 Floating condenser SET POINT 9 lt a Double circuit compressor unit MT display cabinet Condenser i group Liquid receiver LT display cabinet Fig 4 e This type of system can be controlled by pRack in the following conditions l the compressors must have the SAME CAPACITY 2 themax number of compressors in the MT unit and LT unit is 4 There can therefore be combinations of 2
18. 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 43 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 SP DF for the last 1 compr 2 compr 3 compr 4 compr Key SP Compressor set point r01 DF Compressor differential r02 RP Pressure read Fig 4 a Dead band 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 4 3 The number of devices to be activated varies according to the time elapsed outside of the dead band The first device
19. open the device 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
20. 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 with parameters 21 and 22 No Channel NTC probe 1 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 Diff 2 C 4 Alarm ON Alarm OFF Set Point temperature Fig 6 a Cod CAREL 03 220431 rel 2 1 dated 05 07 10 22 6 6 Prevent high discha
21. 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 Compressor and fan dead band management Un B ON 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 1 2 Main characteristics Main functions e Control of compressor suction pressure e Control of condensing pressure compressor discharge Complete management of the outputs available e Complete alarm management e Connection to serial line for supervision telemaintenance Devices controlled e Compressors up to 4 hermetic compressors no part load e Condenser fans max 4 e PWM speed control Programming
22. the dead band NZ the inverter output does not undergo any variation In the deactivation zone DoffZ the fans are stopped as follows 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 OutPress 8 Key InPress Discharge pressure SMJ B Set point differential I r I StpM HP set point Inverter 1 e DOnZ Activation zone Ov DOHZ Deactivation zone NZ Dead band 7 T T si Time i 1 Tg Nan bod Inverter nverter status EET EUR BRE NE 1 NFan Number of fans on 3H H 4 D lt 2 M me 1 1 Cod CAREL 03 220431 rel 2 1 dated 05 07 10 20 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 PWM signal The example below shows two graphs representing the two modes In the graph it can be seen that the request is 8096 of the maximum value V 5 Volt Fig 5 g The PWM signal controls for example the CAREL FCS series CONVONOFF CONO0 10A0 modules ON OFF fan control board code CONVONOFFO The CONVONOFFO modules convert the
23. the event of a discharge probe fault or not connected alarm parameter 12 sets the number of fans that are forced on 5 5 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 r27 Min In S key 10 Volt STPI Fan inverter set point RBI Inverter differential Min In Minimum inverter opening C Fan set point differential STPI C OutPress 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 be 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 15 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 s
24. the installation use or impossibility to use the product even if CAREL or its subsidiaries are warned of the possibility of such damage DISPOSAL A 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 2005 and the related national legislation please note that 1 WEEE cannot be disposed of as municipal waste and such waste must be collected and disposed of separately 2 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 3 The equipment may contain hazardous substances the improper use incorrect disposal of such may have negative effects on human health and on the environment 4 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 15 August 2005 and that it must be disposed of separately 5 In the event of illegal disposal of electrical and electronic waste the penalties are specified by local waste disposal legislation wel i amp SIGNAL SJ CABLES a 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 cables to
25. the password to access the Installer branch 0 to 999 44 New Manufacturer password RW 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 gw C 43 1 0 to 5 V probe 0102 2 2 0 to 5 V probe Compressor menu Min compressor ON time RW C C01 inimum ON time for same compressor 5 010 999 10 m compressor RW C C02 inimum OFF time for same compressor S 0 to 999 120 Min time between starts C inimum time between two start calls for different compressors Avoids 010 999 30 of different compressors simultaneous starts Min time between stops of different compressors RW C C04 inimum time between two stop calls for compressors S 0 to 999 10 Min time between starts RW C C05 inimum time between two effective starts of the same compressor 5 0 to 999 360 of same compressor Time between Only if compressor OFF callwih R W C C06 Time between compressor stop call with high pressure prevention active 5 0 to 999 30 md prevent active P Compressor operating houtt reshold for RW hour threshold for maintenance alarm If set to 0 hx100 010220 0 maintenance alarm ur 1 operating CO8 Display compressor 1 operating hours hx100 Oto 320 0 Reset compressor 1 operating hours RESET Compressor 1 Rw 1 CO9 0 NO RESET 0 1 0 operating hours 1 RESET Compressor 2 operating R C10 Display compressor 2 operating hours hx100 Oto 320
26. to 999 1 Exchange auto gt man LP 3 On the 3rd activation within the set time the low pressure alarm from 21 0 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 I 22 0 NO 0 1 0 disconnected 1 YES Maintenance menu Enable operation of compressor 1 in automatic mode Enable compressor 1 R W M01 0 0 YES Enable operation of compressor 2 in automatic mode Enable compressor 2 RW M02 0 0 YES Enable operation of compressor 3 in automatic mode Enable compressor 5 RW I M03 0 NO 0 YES Enable operation of compressor 4 in automatic mode Enable compressor 4 RW M04 0 0 YES Manually operate compressor 1 Force compressor 1 R W M05 0 NO 0 0 YES Manually operate compressor 2 Force compressor 2 R W M06 0 NO 0 0 YES Manually operate compressor 5 Force compressor 5 RW MO7 0 NO 0 0 YES Cod CAREL 03 220431 rel 2 1 dated 05 07 10 31 Parameter Type Pos Display Description UOM Range Default Notes Force compressor 4 Mog Manually operate compressor 4 0 NO YES 0 0 Enable fan 1 M09 Enable operation of fan 1 in automatic mode 0 NO YES 0 Enable fan 2 M10 Enable operation of fan 2 in automatic mode 0 NO YES 0 Enable fan 3 M11 Enable operation of f
27. to the compressor safety devices e Multifunction input for generic alarm general suction pressure switch 1 and 2 Outputs used e Compressor outputs 4 1 General settings Parameters used for ON OFF control e number of compressors e compressor times e 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 42 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 LIFO rotation no rotation The first compressor to start will be the last to stop 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
28. used to copy the complete set of parameters to the Rack 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 controllers that have the same firmware version Refer to the programming key 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 to the supervisor Not modifiable R W Read Write Received and sent from the to the supervisor Can be modified by the supervisor Analogue variables
29. 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 03 220431 rel 2 1 dated 05 07 10 13 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 Fig 4 b Compressor dead band with variable times Key DOffz DOnZ NZ DZN RP SP Device deactivation zone Device activation zone Dead band Dead band differential Suction pressure read Set point 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 following parameters must be configured e Maximum compressor on time parameter r08 e Minimum compressor on time parameter r07 e Pressure differential within which the time varies parameter r11 e Maximum compressor off time parameter r10 e Minimum compressor off time parameter r09 I DTNZ gt lt DOFIZ RBM Si NZ
30. 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 max value has been changed from 999 hours x 10 to 320 hours x 100 C12 max value has been changed from 999 hours x 10 to 320 hours x 100 C14 The max value has been changed from 999 hours x 10 to 320 hours x 100 The following r parameters have been modified rOl The min value is now r12 The max value is now 15 r03 The min value is now r14 The max value is now r15 rli The min value has been changed from 0 to 17 min value of suction probe min value of setpoint 1 0 bars r12 The min value has been changed from 0 to 17 min value of suction probe min value of setpoint 1 0 bars 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 value has been changed from 0 to 18 min value of probe min value of setpoint2 1 0 bars r15 The max value has been changed from 40 bars to 20 max value of suction probe B1 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 to 3 bars 18 C r19 The default value has been changed from 0 5 bars 3 C to 3 bars 18 C 123 The times for the fans in the dead zone also apply to the proportional band ZN only indication removed 124
31. 0 hours Cod CAREL 03 220431 rel 2 1 dated 05 07 10 29 Parameter Pos Display Description UOM Range Default Notes Reset compressor 2 operating hours Ld 2 CH O NO RESET 0 peraung 1 RESET 3 operating R C12 Display compressor 3 operating hours hx100 Oto 320 0 Reset compressor 3 operating hours RESET Compressor3 Taw Cr fo NO RESET on 0 peram 1 RESET 4 operating R C14 Display compressor 4 operating hours hx100 Oto 320 0 Reset compressor 4 operating hours dae gW G5 lo NORESET 0 perating 1 RESET Control menu DAT set point RW U T0 Compressor set point first circuit bar C 2 3 1 0 differential RW U r02 Compressor differential first circuit bar 0 to 20 0 0 5 oe set point RW U r03 Compressor set point second circuit bar C rl4torl5 1 0 For two circuits only PM differential RW U T04 Compressor differential second circuit bar C 010200 0 5 For two circuits only 0 No rotation Compressor rotation RW C 05 Type of compressor rotation 1 FIFO 1 For single circuit only 2 Time Type of compressor control 0 Proportional Compressor control NW C 06 1 Dead band 0 2 1 2 Dead band with time Min call time start in dead RW 107 Set minimum call time for compressor starts in dead b
32. 2 3 1 1 1 One compressor rack will be allocated to probe LP1 and the other compressor rack to probe LP2 4 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 A 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 Time between stop requests with HP prevent active Parameter C06 sets stop delay between one compressor and the next if the high pressure 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 Tis Cmp Compressor TMinOn Minimum ON time Cmp T Time lt T s TMinOn Fig 4f Cod CAREL 03 220431 rel 2 1 dated 05 07 10 16 Hack Minimum compressor OFF time Sets the minimum time the compressors stay off The devices are not started again if the minimum time selected paramete
33. 2 maintenance A06 R 24 Compressor 5 maintenance A07 R 25 Compressor 4 maintenance A08 R 26 General discharge pressure switch from multifunction DI 12 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 51 High outside temperature HtE 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 RW 4 Number of fans 09 09 Unit status 0 Unit ON 1 OFF from alarm 2 OFF from supervisor R 5 5 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 Minimum compressor ON time R W 9 Minimum compressor OFF time C02 R W 0 Minimum time between starts of different compressors C03 RW 1 Minimum time between starts of the same compressor C05 RW 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 07 R W 7 Number of compressors on in circuit 2 with probe damaged 08 R W 8 Number of fans on with probe damaged 12 R 9 Version of the application RW 20 Type of refrigerant 55 R W 21 Capacity of compressor 1 03 R W 22 Capacity of compressor 2 04 RW 25
34. CAREL p Rack Standard compressor racks single two circuit User manual LEGGI E CONSERVA QUESTE ISTRUZIONI READ AND SAVE THESE INSTRUCTIONS wal POWER i amp SIGNAL ag CABLES k 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 doc
35. Capacity of compressor 5 05 R W 24 Capacity of compressor 4 06 25 Inverter readout RW 26 Multifunction DI configuration 15 RW 27 B1 type probe 16 RW 28 B2 type probe 21 Cod CAREL 03 220431 rel 2 1 dated 05 07 10 35 Hack Flow Index Description Parameter RW 29 B3 type probe 2 R W 30 Delay restart after black out 371 R W 31 Min time between two stop calls for different compressors C04 RW 32 Time between compressor stop call with Prevent function C06 RW 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 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 08 RW 4l 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 121 RW 44 Integral time for P I fan control 122 RW 45 Time between 2 fans starts in dead band 123 RW 46 Time between 2 fans stops in dead band 124 RW 47 Inverter speed up time 127 RW 48 Inverter ramp up time r28 R W 49 Minimum inverter output 129 RW 50 Maximum inverter output 130 R W 51 Triac impulse duration r31 R
36. DTNZ gt 4 InPress Suction pressure STPM Control set point RBM Control band NZ Dead band DOnZ Device activation zone DOFZ 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 greater than or equal to point b DTNZ same call time as Min on time DTNZ TOnMax TOnMin TOffMax TOffMin In the deactivation phase on the other hand the following cases are possible l1 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 than or equal to point STPM DTNZ same call time as Min off time InPress bar Differential within which the time varies Maximum compressor on time Minimum compressor on time Maximum compressor off time Minimum compressor 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 44 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 compressors forced on so as to ensure min
37. The times for the fans in the dead zone also apply to the proportional band ZN only indication removed 126 The max value has been changed from 40 bars to 20 max value of suction probe B1 The following A parameters have been modified A01 The default value has been changed from 4 bars to 9 3 bars The max value has been changed from 40 bars to 19 max value of suction probe B4 A03 The default value has been changed from 0 5 bars to 0 bars A05 The default value has been changed from 4 bars to 9 5 bars The max value has been changed from 40 bars to 20 max value of suction probe B1 A07 The default value has been changed from 0 5 bars to 0 bars A09 The max value has been changed from 40 bars to 20 A10 default value has been changed from 10 bars 20 C to 0 bars 50 C Them in value has been changed fro A18 has been changed from seconds to minut Them The default value has been changed f ax value has been changed fro m 0 bars 0 C to 18 50 C es Tom 90 sec to 60 min m 999 sec to 500 min Cod CAREL 03P220431 rel 2 1 dated 05 07 10 41 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
38. an 3 in automatic mode YES 0 Enable fan 4 M12 Enable operation of fan 4 in automatic mode 0 NO YES 0 Force fan 1 M13 Manually operate fan 1 0 NO YE 0 Force fan 2 M14 Manually operate fan 2 0 NO YE 0 Force fan 5 M15 Manually operate fan 3 YE 0 Force fan 4 M16 Manually operate fan 4 0 NO YE 0 Force inverter 10 19 1 M17 Manually operate the inverter at 100 0 NO YE 0 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 at 250 Vac in 1 3 HP inductive Fig 11 a Cod CAREL 03 220431 rel 2 1 dated 05 07 10 32 24Vac Y GND I No Com Nc Tab 10 b 12 PWM to 0 to 10 Vdc or 4 to 20 mA conversion board for fans code CONVO 10A0 The CONVO0 10A0 modules convert the PWM signal sent from terminal Y on the pRack 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 E a 5 E DGN Fig 12 a o 10V 4 20m 13 Programming key code PSOPZKEYAO The programming keys PSOPZKEYOO and PSOPZKEYAO for CAREL controllers are
39. and 5 C03 to r08 20 grad baid band control is enabled Max call time start in RWJ r08 Set maximum call time for compressor starts in dead band 5 07 to 999 60 dead band dead band control is enabled Min call time stop in dead RW r09 Set minimum call time for compressor stops in dead band 5 0 to 10 band band control is enabled Max call time stop in RW Set maximum call time for compressor stops in dead band 5 0 to 999 60 Onlyi dead pany dead band control is enabled Dead band differential S 29 0 pressure in which the RW i Pressure differential in which the compressor start stop time is proportional bar 17 200 05 Only i de d band to the suction pressure control is enabled time varies Min compressor set point RW C 12 the lower limit of the compressor set point circuit 1 bar 17 to r13 0 1 Max compressor set point RW C r13 Setthe upper limit of the compressor set point circuit 1 bar r12 to 19 9 5 setpoint RWI C r14 Set the lower limit of the compressor set point circuit 2 bar 18tor15 0 1 For two circuits only ee setpoint RW C r15 Set the upper limit of the compressor set point circuit 2 bar r14 to 20 10 For two circuits only 15 5 Fan set point RW U 16 Fan set point eC 125 to r26 357 For single circuit only 0 to 20 0 3 Fan differential RW U 17 Fan differential eC 010200 i8 For single circuit only bar 15 5 Only if the inver
40. anges 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 72 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 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 5 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 5 times within a set time default 10 minutes it becomes an alarm that must be reset manually that is using parameter
41. avoid possible electromagnetic disturbance Never run power cables including the electrical panel wiring and signal cables in the same conduits CONTENTS 2 NNN Sh ON ON WN A Sabe E de Re dm N tn Cn Cn Un tA NO PRODUCE 7 General functions js E m Main characteristics onte as CD OS CL ADI on LAE 7 USER IN TIER AGE ranee Oeo E ORO 8 B ttoris s EEDS COFIS acce t e PUR DONE DURUM QUIE REGNUM RR UHR UE QU RUUUIDOUE DOE ERE 8 LED sdisplayzattd M 9 STARTING THE UNIT 10 Starting for the first time a 10 Unit conflguration ordenada od ge on PO d ERO Uh una qa deme ied 10 Meaning of thesinputs OUtpUtS in cis cel cele ed ce cato eue Ghai t Oe du ub edt ex eut ebrei eut dae ca c 10 COMPRESSOR MANAGEMENT General settings 1 Compressor rotation COImpreSSOf CONTO ata n id ie ed n eee an ce ute dame eU ea d 1 Number of compressors started with probe 1 fault 1 Compressors with different capacities Mantially enable disable he corTipfessols as ssp sunaha hae 1
42. 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 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 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 Theinverter is activated as soon as there is demand with a value no less than the minimum inverter opening inverter output is increased according to the times set by parameter r23 Ifthe inverter output reaches 100 the situation persists In
43. e pressure probe Line To serial link Cod CAREL 03 220431 rel 2 1 dated 05 07 10 39 ulator no alarm relay output ext temp probe amb temp probe Line alarm C2 Il 1 B2 105 103 will Y 6 0 104 2 compressors unit 5 condenser fans Fig 17 c Key SPV oooo RS485 option suction pressure probe A To program key discharge pressure probe L1 To serial link ext temp probe amb temp probe 1 B2 105 103 will Y GND 104 alarm C2 Il N L Line Fig 17 d Cod CAREL 03P220431 rel 2 1 dated 05 07 10 40 Key SPV oooo RS485 option suction pressure probe A To program key discharge pressure probe IE To serial link 20 Appendix Changes introduced in Fw release 2 0 for MRKOOOOXXO The latest FW release has changed from 1 7 to Modifications have been made to the following strings In the case of two refrigerant circu
44. e Display and control of the values measured on LED display e Three levels of parameter protection SEL USER PRG INSTALLER SEL PRG MANUFACTURER e Possibility to configure all the unit parameters using a hardware key e Possibility to configure the main unit parameters via serial line e 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 1 dated 05 07 10 7 Rack 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 2 User interface The product uses a 5 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 display and keypad can be used to modify the unit operating parameters The following figures show the 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 passwo
45. ed alarm is activated this number Number of fans ON with Vna RW C 2 of fans are started These are in any case managed by the individual alarms 004 0 probe fault I and general pressure switches Enable fans with 0 independent operation of the fans compressors ON RW C ft fans on only when at least one compressor is ON o o bon i Set the logic of the digital inputs Digital input logic N O RW C 14 10 with no alarm the contact is open 0 1 1 NO NC No alarm N C with no alarm the contact is closed Set the type of multifunction input 0 no function unit ON OFF NC contact ON 2 change set point set1 set2 3 general high pressure switch NC If the 4 outputs are 4 general high pressure switch NO used this parameter is Multifunction input ns 5 general low pressure switch 1 NC 010 12 0 ignored and the configuration 6 general low pressure switch 1 NO Multifunction Input is 7 general low pressure switch 2 NC set as fan thermal 8 general low pressure switch 2 NO overload 9 liquid level alarm NC 10 liquid level alarm NO 11 general fan thermal overload NC 12 general fan thermal overload NO B1 probe set 0 probe not connected B1 probe type gw C 16 1 NTC probe 0102 2 2 0 to 5 V probe MIN suction pressure RW C 17 Set the minimum value of suction probe bar 1 0to 19 1 0 eue s RW 18 the minimum value of discharge probe suction probe of second circuit 1 0 to 20 0 MAX s
46. er parameter 36 Each controller must have the address set so that e There are NO other devices with the same address on the same serial line e 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 autornatically 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 pa
47. ess the button PRG per at least 5 secs PW 44 Prg Press the PRG SEL button together for more than 5 seconds MANUFACTURER mute Sel PASSWORD OFFERS THE POSSIBILITY OF DISPLAYING ALL PARAMETERS THE PARAMETERS FOR PROGRAMMING THE UNIT AND CHANGING THE LEVEL OF PROTECTION Structure of the parameters Main synoptic chart Password LP1 S P and L P LP2 parameters C S P Set Parameters HP T L P Level Parameters s2 P 53 visibility 0 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 0102 0 Set the unit model SINGLE CIRCUIT 0 0 compressors 1 1 2 2 compressors 3 5 compressors 4 4 compressors TWO CIRCUIT 5 1 compressor 1 compressor 6 2 compressors 1 compressor 7 5 compressors 1 compressor 8 2 compressors 2 compressors Unit model RW C 01 0108 2 Cod CAREL 03 220431 rel 2 1 dated 05 07 10 2 Parameter Pos Display Description UOM Range Default Notes Compresor wih Enable management of compressors with different capacities diff
48. et 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 Minln 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 Inverter RB Fan differential RBI Inverter differential STPM Discharge set point 10 Volt 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 Min In OutPress Fig 5 d Proportional control set by parameter r21 may be proportional only parameter 121 0 or proportional integral parameter 21 1 Cod CAREL 03P220431 rel 2 1 dated 05 07 10 19 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 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
49. hold 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 25 R W 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 R W 4l Set point prevent high pressure function 53 R W 42 Set point offset to change set from DI 34 R W 45 Differential pressure for dead band by time rll R W 44 Condensing temperature delta for floating control r33 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 RW 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 of 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 5 R 5 Status of digital input 4 R 4 Status of digital input 5 RW 5 Reset alarms A19 RW 6 Digital input logic 4 RW 7 Alarm relay logic 28 RW 8 Enable fan inverter 10 RW 9 ON OFF from supervisor 38 RW 20 Enable prevent control on condenser 52 RW 21 Enable management of different compressors 02 R W 22 Type of compressor reset 29 RW 23 Type of fan reset 50 RW 24 Type of reset for general high press switch
50. ime between compressor stops with prevent HP active 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 03 220431 rel 2 1 dated 05 07 10 23 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 digital 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 ch
51. imum 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 03 220431 rel 2 1 dated 05 07 10 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 will always be the first to start 4 5 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 _ Capacity x Setpoint press Differential Capacity _ required
52. n the alarm stops the compressor starts again thermal overload alarm RW 29 Displayed only if the parameters are enabled 0 1 1 reset 0 AUTO 1 MANUAL Type of thermal overload generic alarm reset relating to the individual fan T ffan thermal Automatic when the alarm stops the fan starts again Displayed only if the ype or Tan merma RW C 30 parameters are enabled 0 1 1 overload alarm reset 0 AUTO 1 MANUAL Type of general discharge ee high pressure switch reset pressure switch reset 1 MANUAL Prevent high discharge TE pressure RW C 32 Enable high discharge pressure prevention 0 1 0 Set point RW C 33 High 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 R124a 3 R404a 4 R407C Refrigerant conversion RW C 55 5 R410a 0to 11 3 6 R507 7 R290 8 R600 9 R600a 10 R717 11 R744 Supervisor configuration Identification number of the pRack board for the Serial address RW C 36 supervisor serial network 1 to 200 1 Delay restart after black out R W 37 Enable delay at start up after a black out with the set time If 0 no delay 5 0 to 999 0 Unit ON OFF from the ME m Dic unit from the supervisor supervisor 1 ON Enable disable unit by parameter nee id by aw U 39 on 1 ON New User password RW U 40 Used to change the password to access the User branch 0to 999 22 New Installer password RW 41 Used to change
53. n 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 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 NZ Dead band DOnZ Device activation zone DZN Dead band differential RP Discharge pressure read SP Fan set point Fig 5 b 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 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 1 dated 05 07 10 18 LIFO rotation no rotation parameter r20 0 The first fan that to start will be the last to stop e Start Fan Fan2 Fans Fan4 e Stop Fans Fans Fan2 Fanl FIFO rotation parameter r20 1 The first fan that to start will be the first to stop e Start Fan1 Fan2 Fans Fan4 e Fanl Fan2 Fans Fan4 The rotation of the fans is implemented when called Various fan parameters In
54. ncluded PSOPZKEYAO programming key with 230 Vac external power supply KIT code uRack RS485 Ratiometric pressure probe Cables for Connectors kit 2 m cables kit 1to 4 2 1 to 9 3 bar 0 to 34 5 bar pressure probe MCHSMLCAB2 MRK00010DK DIN No 1 1 2 DIN No MRKO000200K panel No 1 1 2 No MRK00030DK DIN No 1 1 2 DIN Yes MRKO000400K panel No 1 1 2 Yes MRKO00050DK DIN No 1 1 2 DIN Yes MRKOOO600K panel No 1 1 2 panel Yes Cod CAREL 03P220431 rel 2 1 dated 05 07 10 38 19 Appendix Compressor rack controller examples of application diagrams 4 compressors unit with fan speed regulator Line Tx Rx GND suction pressure probe N ext temp probe HN amb temp probe alarm C3 multifunction D I TE RS485 discharge option pressure probe To serial link 2 compressors unit 2 condenser fans N Line L x un C34 x C5 x Nos GND B4 V 8 Key SPV ES n 2 al suction T 5 pressure s 3f 5 probe 3 53 5 M To program key discharg
55. ng 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 and then the fans will be allocated in sequence Relay no 5 may be e e afan The selection is made automatically according to the number of devices fans and compressors selected If 4 devices are selected e g 2 compressors 2 fans relay 5 can be used as an alarm relay default setting while if 5 devices are controlled e g 2 compressors 5 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 nofunction e 1 ON OFF ON contact NC e 2 change set point set1 set2 e 3 general high pressure switch NC e 4 general high p
56. now more than the value of the DELAY START parameter is included the delay imposed by their relative parameter CAREL reserves the right to make modifications or changes to its products without prior notice Cod CAREL 03 220431 rel 2 1 dated 05 07 10 42 CAREL CAREL INDUSTRIES HQs Via dell Industria 11 35020 Brugine Padova Italy Tel 39 049 9716611 Fax 39 049 9716600 http www carel com e mail carel carel com Cod 03P220431 urack Rel 2 1 05 07 10
57. nt 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 uRack 17 Technical specification Group 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 5 W Fuse to be fitted in series with the power supply of the uRack 315 mAT 12 pin connector Max current 2 A for each relay output extendable to 5 A for one output Relays Max 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 105 IDB4 Electrical s
58. ormally open contact relay no 4 Fan 2 NO5 Normally open contact relay no 5 Generic alarm Tab 15 d Cod CAREL 03P220431 rel 2 1 dated 05 07 10 36 16 Glossary 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 Differential 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 device 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 poi
59. r C02 has not elapsed since the last stop Key R R Compressor call Cmp Compressor Tis TMinOff Minimum OFF time T Time Cmp lt 3 gt TMinOff Fig 4 g 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 TDiffSw Minimum time between starts of different compressor T Time Cmp1 TDiffSw Fig 4 h 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 allowable number of starts per hour is 10 to guarantee this limit simply set a value of 360 parameter C05 R Key R Compressor call Tis Cmp Compressor TSameSw Minimum time between starts of the same compressor Cmp T Time lt gt Tis TSameSw Fig 4 i Cod CAREL 03P220431 rel 2 1 dated 05 07 10 17 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
60. rameter menu to change the values or press DOWN or UP to display of the string L P Level Parameters 3 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 4 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 03 220431 rel 2 1 dated 05 07 10 26 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 Press the SEL button for at least 5 secs m PW 22 E INSTALLER Prg PARAMETERS B Pr
61. rd 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 r 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 v the arrows scroll to HP B2 3 Unit B two circuit standard 1 1 the arrows scroll to LP2 HP B3 b Press the button for more than 5 sec to select
62. ressure measurement error Cod CAREL 03P220431 rel 2 1 dated 05 07 10 The voltage error in the input range of 0 5 to 4 5 Vdc is 2 excluding probe 37 18 Product codes list MRK0000000 panel mounting 32x74 24 Vac with connectors kit MRKOOOOODO Rack DIN rail mounting 24 Vac with connectors kit MRKOOOOADO uRack 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 11 1 mm removable terminal right angle female 3 pin pitch 5 08 mm high 11 1 mm DIN version only Accessories MCH2CONO001 connectors kit for uChiller2 uRack panel mounting version MCH2CONO11 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 Rack 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 Rack panel mounting version 5 000 RS485 serial board for per uRack DIN rail mounting version PSOPZKEYOO programming key with 12 Vdc batteries i
63. ressure switch 1 NO e 5 general low pressure switch circuit 1 NC e 6 general low pressure switch circuit 1 NO e 7 general low pressure switch circuit 2 NC e 8 general low pressure switch circuit 2NA 9 liquid level alarm NC 10 liquid level alarm NO e 11 fan thermal overload generic NC 12 fan thermal overload generic NO 322 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 switches the controller off e Stopsthe management of the various devices and the related alarms 3 3 Meaning of the inputs outputs 3 5 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 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 507100 R T 10 at 25 C B3 Outside air temperature probe floating condenser control
64. rge pressure This function is enabled by parameter 22 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 If the 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 elapses 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 Discharge pressure T Time NCmp Number of suction steps required ALPrv High pressure prevention alarm STPpr Prevent HP activation threshold TI T
65. rmal overload Fan 2 thermal overload Fan 5 thermal overload Fan 4 thermal overload General fan thermal overload Prevent high discharge pressure Compressors off for Prevent HP Excessive prevent frequency High outside temperature High ambient temperature High supply voltage Low supply voltage EEPROM error Zero cross B2 probe error faulty or disconnected B5 probe error faulty or disconnected Generated by Action performed Type of reset Al Al Al Al Settable no comps ON manual AN SetablenofansON DN Fano Settable DN Fn2OF 5 DN FasOff Settable DN _ Only signal alarm Preset EM electronically the fan stop during overload Automatic PAIN __ Ami a ai Power supply 10096 Fans i voltage AIN Automatic Automatic Delay Notes settable settable See compressor management with probe 30 seconds broken See compressor management with probe broken 30 seconds Force fan inverter to 100 no no no no o Display only 3143 o o 7 5 Fixed differentials Cod CAREL 03 220431 rel 2 1 dated 05 07 10 Alarms from analogue in 0 2 bar suction 1 0 bar discharge Diff Alarm on Set Point Fig 7 a Diff 4 Alarm off Fig 7 b Set Point puts temperature probe and press
66. tandard 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 Front panel index of protection Control signal for CAREL MCHRTF CONVONOFF CONV0 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 output load 1 kW IP55 Storage conditions 10170 C humidity lt 80 r H non condensing Operating conditions 10750 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 Note All the relays must have the commons C1 2 C3 4 connected together as shown in Fig 1 e 2 Functional specifications Resolution of analogue inputs Temperature probes range 40T80 C 0 1 C Temperature measurement error Range 20120 C 0 5 C excluding probe Range 40T80 C 1 5 C excluding probe P
67. ter is Inverter set point RW U 18 inverter set point 125 to r26 357 enabled 7 y 0 to 20 0 3 Only if the inverter if Fan inverter differential R W U 19 inverter differential 010200 18 enabled Type of fan rotation Fan rotation RWI C r20 10 NO ROTATION 0 1 1 For single circuit only 1 Type of fan control 0 Proportional RC Fan control gw C 121 1 Proportional integral 0to2 0 For single circuit only 2 Dead band Integral time P l only RW r22 Integral time with P I control 5 0 to 999 600 Only if PI Time between fan start call RW 125 Minimum time between two successive calls to start different fans 5 0 to 999 2 x Time between fan stop cal RW C 124 Minimum time between two successive calls to stop different fans 5 0 to 999 2 x i bar 0 to r26 1 0 Min fan set point RW C 125 Setthe lower limit of the fan set point 60 to 26 312 xe bar 125 to 40 0 25 0 Max fan set point RW C 126 Setthe upper limit of the fan set point eC 25 to 150 553 Fan inverter speedup 7 2 Only if the inverter is dime RW C 127 Faninverter speedup time S 0 to 999 2 enabled Inverter ramp up time RW 1 r28 Set the time taken by the inverter to reach full load S 0 to 999 10 Cod CAREL 03 220431 rel 2 1 dated 05 07 10 30
68. 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 Setthe force inverter parameter back to AUTO The operation is now complete wv df OON 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 exchanger used b Minimum condensing pressure r25 O Maximum condensing pressure r26 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 floating 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 Also independently by probe is used only the differential of temperature can be displayed Cod CAREL 03P220431 rel 2 1 dated 05 07 10 21
69. 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 setting Prg Press the two buttons together for 5 seconds to set the PWD for accessing the MANUFACTURER parameters and thus configuring the controller met Sel HP 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 2 high low threshold to switch the display of the same parameter from BAR to Tab 2 a Cod CAREL 03 220431 rel 2 1 dated 05 07 10 8 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 ICONS Description 9ar On when the unit of measure selected is BAR o ei On when the unit of measure selected is 9 On when there is an ACTIVE ALARM A LP 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 activa
70. tion of suction probe alarms High Temp Low Temp Probe not connected HP 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 at 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 2 3 4 1 Indicates the state of the compressors 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 03 220431 rel 2 1 dated 05 07 10 9 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 usi
71. uction pressure RW C 19 Set the maximum value of the suction probe bar 17 to 45 0 9 5 MAX discharge suction 2 Setthe maximum value of the discharge probe suction probe of second 18 10450 345 pressure circuit B2 probe set 0 probe not connected B2 probe type RW m 1 ambient air temp probe for two circuit condenser probe 902 g 2 auxiliary temperature probe used for HT alarm B3 probe set 0 probe not connected B3 probe type RW C m 1 outside air temp probe nie n 2 auxiliary temperature probe used for HT alarm B4 probe calibration RW Suction probe calibration 0 suction B1 Probe calibration discharge RW 24 Discharge probe calibration bar 12 to 12 0 B2 probe calibration R W 25 Room probe calibration 121012 0 B3 probe calibration RW 26 Outside probe calibration o 12 to 12 0 Probe displayed as default 0 probe B1 Display probe RW U 27 probe B2 0103 3 2 probe B3 3 probe B4 Cod CAREL 03 220431 rel 2 1 dated 05 07 10 28 Parameter Pos Display Description UOM Range Default Notes Logic of the alarm relay Alarm relay logic RW C 28 JO NC 0 1 1 If alarm relay enabled 1 NO Type of thermal overload generic alarm reset relating to the individual Type of compressor compressor Automatic whe
72. umentation supplied 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
73. ure transducer e of LP alarm management Alarm off Low press of HP alarm management Alarm on High press 25 Tab 7 a 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 status of the inputs outputs e 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 uRack compact MRK00000D0 FCSER00000 Serial output board for DIN version to be fitted in the instrument with serial option FCSER00000 already FITTED CAREL Tab 8 a 82 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 numb

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