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17.10 Alarms

– fans section

LAF

Low pressure alarm

– fans section

: The measurement unit depends on the dEU

parameter: (FA04 ÷ HAF bar; -50.0÷HAF °C; FA04÷HAF PSI; -58÷HAF °F)

It’s

independent from the set point. When the value LAF is reached the LA2 alarm is enabled,
(possibly after the

AFd

delay time).

HAF

High pressure alarm

– fans section

: The measurement unit depends on the dEU

parameter: (LAF÷FA20 bar; LAF÷150.0 °C; LAF÷FA20 PSI; LAF÷302 °F).

It’s

independent from the set point. When the value HAF is reached the HA2 alarm is enabled,
(possibly after the

AFd

delay time).

AFd

Low and High pressure alarms delay

– fans section

: (0÷255 min) time interval

between the detection of a pressure alarm condition in the fans section and alarm
signaling.

HFC

Compressors off with high pressure (temperature) alarm for fans

= compressors are not influenced by this alarm

yES

= compressors are turned off in case of high pressure (temperature) alarm of fans

HFdP Digital Compressor Capacity percentage in case of high condenser pressure

(temperature) alarm

(0÷80%; with 0 the compressor is stopped)

dHF

Interval between 2 compressors turning off in case of high pressure (temperature)
alarm for fans

(0 ÷ 255 sec)

PnF: High pressure-switch intervention numbers

– fans section:

(0÷15 with 0 the manually

unlocking is disabled) if the high pressure-switch is enabled PnF times in the PiF interval,
the controller is locked.

It can be unlocked only manually

. See paragraph 0. Every time

the pressure-switch is enabled all the compressors are turned off and all the fans are
turned on.

PiF:

Pressure-switch interventions time

– fans section

(1÷15 min) Interval, linked to the

PEn parameter, for counting interventions of the high pressure-switch..

FPr

Number of fans engaged with faulty probe

. (0÷#fans).

17.11 Suction superheat

ASH0 Differential for low superheat pre-alarm.

(

0.1 to 30.0°C/ 1 to 60°F).

The low superheat pre-alarm warning is sent when the superheat (SH) is lower than ASH2
(low superheat alarm threshold) + ASH0, possibly after the ASH1 delay.

ASH1 Delay for signalling low superheat pre-alarm

(0÷255sec)

If the superheat is below the ASH2+ASH0 threshold for ASH1 time the low superheat
pre-alarm warning is sent.

ASH2 Low suction superheat alarm threshold (

0.1÷15.0°C/ 1÷30°F). With SH < ASH2 the

low superheat alarm is sent, possibly after the ASH3 delay

ASH3 Delay for signalling low superheat alarm

(0÷255sec)

If the superheat is below the ASH2 threshold for ASH3 time the low superheat alarm
message is sent.

ASH4 Switching off compressors with low superheat alarm

(No, Yes)

ASH4 = no: compressors keep on working even with low superheat alarm.

ASH4 = yES: compressors are stopped in case of low superheat alarm.

ASH5 Differential to restart regulation after of low superheat alarm with compressor stop

(0.1 to 15.0°C/ 1 to 30°F). In case of regulation stop (ASH4= yES), it restarts when SH >
ASH2+ASH5

ASH6 Delay to restart regulation after superheat > ASH2+ASH5 (

0÷255 min). If the

regulation is stopped because of low superheat alarm, it can restart when
SH>ASH2+ASH5 for the ASH6 time.

ASH7 Superheat value to enable hot gas injecting valve (

0.1 to 15.0°C/ 1 to 30°F)

With a relay set as hot gas injection valve, (oA2 or oA3 or oA4 = HGi), the relay is on with
SH < ASH7

– ASH8.

ASH8 Differential for ASH7

(

0.1 to 30.0°C/ 1 to 60°F)

Содержание Dixell XC645D

Страница 1: ...XC645D v 3 4 ...

Страница 2: ...L INPUTS AND PRESSURE SWITCHES 8 5 5 LOAD CONNECTIONS 8 6 MOUNTING INSTALLATION 9 7 FIRST INSTALLATION 10 7 1 HOW TO SET THE KIND OF GAS 11 7 2 HOW TO SET THE RANGE OF THE PRESSURE PROBES 11 8 USER INTERFACE 12 8 1 DISPLAYING 12 8 2 KEYBOARD 12 8 3 ICONS 13 9 HOW TO SEE AND MODIFY THE SET POINT S 14 9 1 HOW TO SEE THE SET POINT OF COMPRESSORS AND OR FANS 14 9 2 HOW TO MODIFY THE SET POINT OF COMPR...

Страница 3: ...1 PLANT DIMENSIONING AND TYPE OF REGULATION 18 17 2 PROBES CONFIGURATION 21 17 3 CONFIGURABLE DIGITAL INPUTS CONFIGURATION 22 17 4 DISPLAY AND MEASUREMENT UNIT 23 17 5 COMPRESSOR REGULATION 24 17 6 LIQUID INJECTION THERMOSTAT 25 17 7 FANS REGULATION 25 17 8 ALARMS COMPRESSOR SECTION 26 17 9 ALARMS DLT SECTION 26 17 10 ALARMS FANS SECTION 27 17 11 DYNAMIC SET POINT FOR FAN 27 17 12 ANALOG OUTPUT OP...

Страница 4: ...fety Precautions Check the supply voltage is correct before connecting the instrument Do not expose to water or moisture use the controller only within the operating limits avoiding sudden temperature changes with high atmospheric humidity to prevent formation of condensation Warning disconnect all electrical connections before any kind of maintenance The instrument must not be opened In case of f...

Страница 5: ...system s safety there are also two inputs for low and high pressure switches when these are activated the system is stopped By means of the HOT KEY the controller can be easy programmed at power on The controller can be connected to the X WEB controlling and monitoring system thanks to the RS485 serial output using the standard ModBus RTU protocol 4 COMPONENTS RELATED TO THE XC645D Name Descriptio...

Страница 6: ...s from the outputs and the power connections Do not exceed the maximum current allowed on each relay 5A resistive in case of heavier loads use a suitable external relay 5 2 Wiring connections NOTE 120V version use terminals 47 48 for power supply Terminals 44 45 46 operate at 120V 90 260V version use terminals 47 48 for power supply Terminals 44 45 46 operate at the same voltage 24V version use te...

Страница 7: ...ort circuiting or introduce noise disturbance at high frequencies To minimize the induced disturbances use shielded cables with the shield connected to earth Temperature probe it is recommended to place the temperature probe away from direct air streams to correctly measure the temperature 5 4 2 Probe wirings Low voltage side Keep the cables away from the power cables Use shielded cable to lengthe...

Страница 8: ...D CONFIGURABLE DIGITAL INPUTS FREE VOLTAGE 5 6 1 Load safety inputs Controller has 7 configurable digital inputs free voltage Each digital input can be set by the related parameter iF01 iF07 The first 4 digital inputs are factory pre set to operate as safety input for loads Each input must collect the status of the safety devices related to the compressor such as thermistors pressure switches etc ...

Страница 9: ...igital input 5 19 20 iF05 function iP05 polarity First configurable input Probe 4 22 23 i1F Pb4 iF07 function iP07 polarity Second configurable d i 22 24 i2F iF08 function iP08 polarity 5 7 HP LP Pressure switches connection WARNING controller is provided with both free voltage digital inputs and main voltage inputs The main voltage inputs are designed for HP and LP pressure switches The low press...

Страница 10: ... Belden 8762 o 8772 or cat 5 cables 3 Maximum distance 1Km 4 Don t connect the shield to the earth or to GND terminals of the device avoid accidental contacts by using insulating tape 6 Mounting installation The instruments are suitable only for internal use Instrument XC645D shall be mounted on an omega DIN rail The ambient operating temperature range is between 10 60 C Avoid locations subject to...

Страница 11: ... r450 r450A r513 r513 1234 r1234ze Press SET to store the new value and move to the following parameter To exit Press SET UP or wait 30s without pressing a key NOTE the set value is stored even when the procedure is exited by waiting the time out to expire 7 2 How to set the range of the pressure probes If an instrument with the following part number is used XC645D xxxxF it is pre set to work with...

Страница 12: ... the same things for the Probe 2 FA04 FA20 parameters 8 User interface 8 1 Displaying UPPER DISPLAY LOWER DISPLAY ICONS Suction temperature or pressure Discharge temperature or pressure Working loads Measurement unit Alarm or status Icons 8 2 Keyboard SET SET Standard visualization to see or modify the set point In programming mode it selects a parameter or confirms an operation Alarm menu By hold...

Страница 13: ... Digital scroll compressor DGS on Flashing DGS is waiting to start 1HZ or digital input alarm for DGS 2Hz or DGS in maintenance status 2Hz ON Load 2 on Flashing Load 2 is waiting to start 1HZ or digital input alarm for Load 2 2Hz or Load 2 in maintenance status 2Hz ON Load 3 on Flashing Load 3 is waiting to start 1HZ or digital input alarm for Load 3 2Hz o Load 3 in maintenance status 2Hz ON Load ...

Страница 14: ...d of gas 2 Set the measurement unit dEU par 3 Check and if necessary modify the set point limits LSE and HSE par PROCEDURE 1 Push the SET key for more than 2 seconds 2 The Lower display will show the SEtC label will the Upper display will show its value flashing 3 To change the Set value push the o or n within 30s 4 To memorize the new value and pass to the fan set point push the SET key 5 The Low...

Страница 15: ...tem is sending the set point to the controller SStF Supervising Set for fan if supervising system is sending the set point to the controller SH Superheat EXIT push the SET UP keys together 11 Parameters programming 11 1 How to enter the Pr1 parameter list To enter the Pr1 parameter list user accessible operate as follows 1 Hold pressed the SET and DOWN key for 3s 2 The controller displays the name...

Страница 16: ...isabled an output during a maintenance session 1 Push the MAINTENANCE CLOCK key for 3s 2 The LED s of the first output is switched on the Lower display shows the StA label while the Upper display shows the On label if the first output is enabled or the oFF label if the output is disabled for a maintenance section With compressor with more steps all the LED s linked to the compressor and the valves...

Страница 17: ...d pushed the key for some seconds till the rSt label starts flashing and the lower display shows zero To exit push the CLOCK key or wait 30 sec NOTE if the SET key is released within 2s the controller reverts to display the running hours of the selected loads 14 Alarm Menu The controller memorizes the last 20 alarms happened together with their duration To see the alarm codes see par par 0 14 1 Ho...

Страница 18: ...case push again o key if you want to restart the upload again or remove the Hot key to abort the operation 16 2 How to program an instrument using a hot key DOWNLOAD 1 Turn OFF the instrument 2 Insert a programmed Hot Key into the 5 PIN receptacle and then turn the Controller ON 3 Automatically the parameter list of the Hot Key is downloaded into the Controller memory the doL message is blinking f...

Страница 19: ...hot gas injection in case of low superheat oA i HGi NOTE also the cPr2 InC1 InC2 dGst values are present These values must not be used According to the oA1 oA2 oA3 oA4 configuration 2 kinds of plant can be defined Rack with compressors only all the oAi different from FAn Rack with compressors and fans both FAn and CPr are used for oAi NOTE COMPRESSOR WITH STEPS CONFIGURATION the output of compress...

Страница 20: ...e contacts of the relay FtyP Refrigerant type set the kind of gas refrigerant used in the plant LABEL REFRIGERANT OPERATING RANGE R22 r22 50 60 C 58 120 F r134 r134A 70 60 C 94 120 F r404A r404A 50 60 C 58 120 F r407A r407A 50 60 C 58 120 F r407C r407C 50 60 C 58 120 F r407F r407F 50 60 C 58 120 F r410 r410 50 60 C 58 120 F r507 r507 70 60 C 94 120 F CO2 r744 Co2 50 30 C 58 86 F r32 r32 70 60 C 94...

Страница 21: ... 11 0 bar PA04 0 5 PA20 11 0 PP30 relative pressure transducer range 0 30bar PA04 0 0 PA20 30 0 PA20 Adjustment of read out for the Probe 1 corresponding to 20mA or 4 5V input signal given by the suction probe PA04 61 0BAR PA04 885PSI PA04 6100KPA CAL Probe 1 calibration the range depends on the dEU parameter dEU bar or C 12 0 12 0 dEU PSI or F 200 200 dEU kPA 999 999 17 2 2 Condenser probe config...

Страница 22: ...y digital input for load 1 term 5 6 Factory setting oA2 Safety digital input for load 2 term 7 8 oA3 Safety digital input for load 3 term 9 10 oA4 Safety digital input for load 4 term 11 12 inF Safety digital input of inverter for fan used when none relay is configured as inverter for fans ES Energy saving oFF instrument shut down LL liquid level alarm SIL to enable the silence function EAL generi...

Страница 23: ...e presence cL HP alarm is signaled with voltage presence iP10 Polarity of Low pressure switch alarm terminals 44 45 oP LP alarm is signaled without voltage presence cL LP alarm is signaled with voltage presence d1d Digital input set as oA1 or Co1 activation delay 0 255s This delay it is considered when i1F or i2F or i3F or i4F or i5F or i7F or i8F is set as oA1 or Co1 d2d Digital input set as oA2 ...

Страница 24: ...h extremes set Pbd 2 set Pbd 2 It is used as proportional band for PI algorithm The measurement unit depends on the dEU CF PMU par rS Proportional band offset PI band offset It permits to move the proportional band of the PI With rS 0 the band is between Set Pbd 2 Set Pbd 2 inC Integration time 0 999s PI integration time dGSP Digital compressor always activated at first no other compressors if ava...

Страница 25: ...n the request of a release and the actual switching off no doF not enabled yES doF enabled odo Regulation delay on start up 0 255s on switching ON the instrument starts working after the time delay imposed in this parameter LSE Minimum set point The measurement unit depends on dEU parameter It sets the minimum value that can be used for the set point to prevent the end user from setting incorrect ...

Страница 26: ...signaling ELP Electronic pressure switch threshold 50 C STC1 58 F STC1 PA04 STC1 Pressure Temperature value at which all the compressors are switched off It has to be set some degrees above the mechanical low pressure switch value in order to prevent mechanical low pressure activation SEr Service request 1 999 hours res 10h 0 alarm excluded number of running hours after that the A14 maintenance ca...

Страница 27: ...ed off and all the fans are turned on PiF Pressure switch interventions time fans section 1 15 min Interval linked to the PEn parameter for counting interventions of the high pressure switch FPr Number of fans engaged with faulty probe 0 fans 17 11 Suction superheat ASH0 Differential for low superheat pre alarm 0 1 to 30 0 C 1 to 60 F The low superheat pre alarm warning is sent when the superheat ...

Страница 28: ... 13 Analog output optional AoC Analog output setting tEn 0 10V output cUr 4 20mA output AOF Analog output function nu analog output disabled Inc1 To drive inverter for suction frequency compressor Inc2 not set it inF to drive ECI fan or inverter for fan FrE Free proportional to the probe P3 and P4 AOP Reference probe for the analog output 1 It is used only if AOP FrE nP not probe P3 probe P3 P4 pr...

Страница 29: ...y pressing the SET key for more than 4s bUr Buzzer enabling no the buzzer is not used in case of alarm yES buzzer is used in case of alarm Adr Serial address 1 247 It is used in monitoring system rEL Software release for internal use Ptb Parameter table code readable only Pr2 Access to Pr2 parameter level 18 Type of regulation 18 1 DIGITAL COMPRESSOR REGULATION 18 1 1 Digital scroll main parameter...

Страница 30: ... than SET Pbd 2 and the TRIAC output is already at maximum another compressor is started after the ton delay time d Then if additional capacity is required pressure higher than SET Pbd 2 another compressor starts after the don time NOTE If the pressure exceeds the value SET Pbd 2 and the DGS compressor is not available blocked by onon oFon safety digital input another compressor is started if avai...

Страница 31: ...ns on at the end of the doF time the DGS is shut down too 18 1 4 Digital Stream Main parameters set up EG Plant with 2 compressors Stream 6D and 2 fans default configuration with PP11 PP30 pressure transducers oA1 dGS oA2 6dG oA3 FAn oA4 FAn dGty StrM The pressure is adjusted by a PI regulation following the same logic of the digital scroll see previous paragraphs 18 1 2 and 18 1 3 ...

Страница 32: ... of PM is 0 NOTE for a proper functioning of the DGS it s recommend a minimum activation time of 2s PMA it limits the percentage of the DGS activation during a tdS period according to the formula Pbd PMA 100 tdS 18 2 Proportional Band regulation only for fans The fan regulation band Pb is divided by the number of fans The numbers of fans switched ON is proportional to the value of the input signal...

Страница 33: ...s The algorithm switch on and off the loads according to the running hours of each load In this way the running hours are balanced Example 4 Fans oA2 FAn oA3 FAn oA4 FAn oA6 FAn rot yES rotation enabled F1 F2 F3 F4 S E T F Set Pb 2 Set Pb 2 ZIC Set Pb 4 Set Pb 4 Fon FoF ALL LOADS ON ALL LOADS OFF ...

Страница 34: ...e fan the controller supplies 10V output for 5s then starts standard regulation MPM 100 Maximum variation per minute The analog output takes 1 min to move from the min to the maximum 18 3 2 How to set it Parameters involved oA i inF AoC tEn AoF InF Aot 0 AOM 30 MPM 100 P2 Volt 10 0 AOM 100 10 P2 SETF Pb 2 SETF Pb 2 On OAi inF SETF Pb 2 SETF Pb 100 2AOM 2 100 a If required set a relay to drive the ...

Страница 35: ...a proper output is supplied to the fan AOt 5 Time of analog output at max after the start With AOt 5 the controller supplies 10V output for 5s at fan start then starts standard regulation MPM 100 Maximum variation per minute The analog output takes 1 min to move from the min to the maximum 18 4 2 How to set it Parameters involved AoC tEn AoF FrE AOP P3 LAO 20 UAO 40 Aot 0 AOM 30 MPM 100 P3 Volt 10...

Страница 36: ...s not been activated by d1d d4d time The compressor 1 4 is switched off and the safety timers start Automatic when safety timers are over LC01 LC04 Running proof alarm with manual recover 5 running proof alarms happened in a hour The compressor 1 4 is switched off Manual by means Controller off on Reset by keyboard Reset by monitoring system 19 1 3 Example EI Rack with 2 compressors with compresso...

Страница 37: ... or oA3 or oA4 as flood protection EI oA4 Liq and then connect it to the external device that blocks the cabinet injection NOTE the relay set as flood protection is automatically activated even when the controller is in stand by mode NOTE If the compressors are activated in fix sequence Sty no and the compressor that has to be activated is locked by safety timers the relay set as flood protection ...

Страница 38: ...Recovery PrSH Low superheat Pre allarm The superheat is less than SH ASH2 ASH0 for ASH1 time Only warning Automatic when superheat SH ASH0 ASH2 1 C 2 F ALSH Low superheat allarm The superheat is less than SH ASH2 for ASH3 time Regulation depends on ASH4 ASH4 no regulation not affected ASH4 yes regulation is stopped Automatic when superheat SH ASH5 ASH2 19 4 Hot gas injection valve Controller can m...

Страница 39: ...6 configuration P2P Second probe presence AOP Probe for analog output When these parameters are set in wrong way an alarm message is generated the label A12 is shown on the upper display while the lower display the following messages are shown Mess Errata Corrige Too Many dGS output More than one oAi has been set as dGs digital scroll Check the oAi parameters and set them different from dGS Too Ma...

Страница 40: ...and set only 1 as inC1 No AnALoGuE out For InC1 None analogue output has been set as inC1 Check AoF and 2AoF and set one of them as inC1 too MAnY InF More than one oAi has been set as inF inverter for fan Check the oAi parameters and set only 1 as inF No AnALoGuE out For InF None anlogue output has been set as inF Check AoF and 2AoF and set one of them as inF CPr Circuit conFiG Error The kind of o...

Страница 41: ...hed on The instrument restart the standard operating mode when the input is disabled If there are PnF activation in the PiF time only manual resetting is allowed by pressing the DOWN key for 3s or by turning off and on the instrument 20 1 4 EA1 EA4 Compressors and fans safeties alarm Terminals WARNING THESE TERMINALS REQUIRE A FREE OF VOLTAGE CONNECTION The terminals from 13 TO 18 really used depe...

Страница 42: ...lly when the pressure temperature increases more than ELP value E0L1 Low pressure switch alarm Low pressure switch input enabled All compressors are turned off Fans unchanged Automatically if the number of activation are less than PEn in the PEi time when the input is disable The compressors restarts working according to the working algorithm Manually if PEn activation happened in the PEi time Whe...

Страница 43: ...isabled Recovery depends on ALMr parameter With ALMr no The instrument restart the standard operating mode when the input is disabled With ALMr yES manual recover for the alarms of compressors and fans Push the DOWN key for 3s C1 LA Minimum pressure temperature alarm compressors section Suction pressure or temperature lower than LAL value signaling only Automatically as soon as the pressure or tem...

Страница 44: ...d InF Inverter fan alarm The configurable dig Input set as EA is activated The analog out set as INF is switched off Automatically as soon as the input is disabled FC01 FC04 Running proof alarm with automatic recover The digital input set as Co1 Co6 has not been activated by d1d d4d time The compressor 1 4 is switched off and the safety timers start Automatic when safety timers are over LC01 LC04 ...

Страница 45: ...ELV Limited Energy circuit 15W Serial output RS485 standard Communication protocol ModBus RTU Data storing on the non volatile memory EEPROM Kind of action 1B Pollution grade normal Software class A Operating temperature 10 60 C Storage temperature 25 80 C Relative humidity 20 85 no condensing Measuring range NTC probe 40 110 C Resolution 0 1 C 1 F 0 1bar 1 PSI Accuracy ambient temp 25 C 0 7 C 1 d...

Страница 46: ... FA20 BAR 15 FA20 PSI 100 FA20 KPA FA20 30 0 Pr2 20mA or 4 5V readout for P2 probe PA04 61 0 BAR PA04 885 PSI PA04 6100 KPA FCAL 0 0 Pr2 P2 probe offset 12 0 12 0 C 20 20 F 12 0 12 0 bar 200 200 PSI 999 999 kPA P3C nP Pr2 P3 probe setting 4 20mA 0 5V ntc nP Cur tEn nt10 nt86 3P04 0 5 Pr2 4mA or 0 5V readout for P3 probe 1 0 FA20 BAR 15 FA20 PSI 100 FA20 KPA 3P20 11 0 Pr2 20mA or 4 5V readout for P...

Страница 47: ...d 0 Pr2 Dig input set as oA4 or Co4 activation delay 0 255 sec did 20 Pr2 Liquid level alarm signaling delay 0 255 min didA 20 Pr2 External alarm signaling delay 0 255 min ALMr no Pr2 Manual reset for compressor fan alarms no yES dEU tPr Pr2 Displaying measurement unit pressure or temperature tMP PrS CF C Pr2 Measurement unit for temperature C F PMU Bar Pr2 Measurement unit for pressure BAr PSI PA...

Страница 48: ...id injection 0 0 180 0 C 32 356 F Lid 10 0 Pr2 Differential for liquid injection 0 1 25 5 C 1 50 F LiPr nP Pr2 Probe selection for liquid injection nP P3 P4 Pb 5 0 Pr2 Proportional band for fan regulation 0 1 30 0 C 1 50 F 0 1 10 0 BAR 1 150 PSI 10 1000 KPA ESF 0 0 Pr2 Energy saving differential for fan regulation 50 0 50 0 C 90 90 F 20 0 20 0 BAR 300 300 PSI 2000 2000 KPA PbES 0 0 Pr2 Band offset...

Страница 49: ... 1 30 F ASH3 120 Pr2 Delay for signalling low superheat alarm 0 255 sec ASH4 no Pr2 Switching off compressors with low superheat alarm No Yes ASH5 5 Pr2 Differential to restart regulation after of low superheat alarm with compressor stop 0 1 15 0 C 1 30 F ASH6 1 Pr2 Delay to restart regulation after superheat ASH2 ASH5 0 255 min ASH7 10 Pr2 Superheat value to enable hot gas injecting valve 0 1 30 ...

Страница 50: ...silence mode function is enabled 0 100 tbA YES Pr1 Alarm relay silencing no yES OAP cL Pr2 Polarity alarm relay OP CL oFF no Pr2 off function enabled no yES bUr YES Pr2 Buzzer enabled no yES Adr 1 Pr2 Serial address 1 247 rEL 3 4 Pr2 Release firmware Readable only Ptb Pr2 Parameter table code Readable only Pr2 Pr1 Pr2 access Readable only ...

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