JTL USER GUIDE CONTROLLER TYPE: UAPI
Contents
1. PREDICT Minimum time between defrosts PREDICT Maximum time between defrosts second case ure defrost Temperature to turn fans on after defrost Enable plant to override temp control ADJUSTABLE PARAMETERS 20 to 80 O off 1 0n O off 1 0n 0 to 20 0 to 30 0 to 10 00 30 to 03 00 00 00 to 23 59 20 100 0 120 0 Optimised Air off 1 cabinet temp O disabled 1 enabled 30 to 10 30 to 10 39 to 5 0 4 to 3 0 O off 1 Fan 2 Heater O Disabled 1 Enabled 1 11 type shown on MU display 7 to 7 1 2 temperature 2 pressure O SUCCEEDS 1 SUCCEEDS with limit 2 fixed 6 0 12 0 0 10 0 5 1 250 disabled 1 enabled disabled 1 auto 2 network psi 2 bar 3 kPa disable 1 enable enabled 1 disabled 30 300 O none 2 Network learned backup 3 Time 5 PREDICT DOA900O toi od uw ut 7 Network real time backup 8 Coordinated learned 9 Coordinated real time 0 to 12 00 00 00 10 00 01 23 59 0 24hr 1 12hr O none 1 Lt 2 Ht 3 Satellite 1 to 7 panel no 1 31 circuit O brown phase 1 black phase 2 grey phase 3 3 phase 6 off cycle 1to8 2to8 6 to 72 0 100 1 Evaporator 2 Air off 3 Termination 4 Time only 0 to 20 00 00 00 30 00 05 to 00 59 00 00 to 00 10 00 00 to 00 10 O not used 1 fans 2 heater 1 run always 2 off during defrost 3 fan controlled on evaporate temperature 4 fan controlled on termination temperature 12 to2. 20 00 00 00 10 0 restart immediately 1 restart after time delay 2 cycle on evaporating temperature 3 cycle termination temperature 20 to 5 O off 1 enabled O off 1 8 broadcast input O off 1 8 broadcast input O off 1 8 broadcast input O off 1 8 broadcast input O off 1 8 broadcast input O off 1 8 broadcast input 1 off 2 off when shutdown 3 fixed adjustment 4 night setback 5 network control 0 100 0 100 0 100 O disabled 1 enabled O disabled 1 8 timer number O n o 1 n c O disabled 1 enabled 0 1 899 7 0 1 899 7 O disabled 1 enabled O off 1 0n O disabled 1 enabled O include 1 exclude O disabled 1 8 timer number O standard time 1 daylight saving time 0 Celsius 1 Fahrenheit O disabled 1 enabled O Off 1 On 0 Disabled 1 Enabled O off 1 0n 2 off Flashing for alarm 3 Flashing for alarm CONTROLLER TYPE UAPI C C C C Bitswitch settings Frozen food CO 1 Frozen food HFC 2 Chillers HFC 3 Produce HFC 4 Frozen food transcritical CO2 5 Chiller Transcritical CO2 0 to 5 is the virtual bitswitch setting on item 966 OTHER USEFUL ITEMS TEMPERATURES Cabinet temperature Air on temperature Air off temperature Evaporator temperature Suction line temperature Cabinet temperature second case Air on temperature second case Termination sensor temperature Accumulated temperature warning time CO
3. N O DEFROST C O PULSED EXPANSION VALVE See Note 1 N O Solid state output REFRIGERATION CYCLES ON TEMPERATURE PUMP DOWN Adjustable time 61 DEFROST Time temp terminated 57 50 ON OFF OR CYCLES TEMPERATURE ON DRAIN DOWN Adjustable time 59 CONTROLLED TERMINATION LIQUID HOLD OFF See Note 4 TEMP Adjustable time 49 r gt zvoz RECOVERY TIME Time temp terminated TEMPERATURE CYCLES OR TIME ON TEMPERATURE CONTROLLED See Note 3 R E F R l G E R A T l o N REFRIGERATION CYCLES ON TEMPERATURE mr o lt o PLANT FAULT UNIT SHUTDOWN FANS ONLY SHUTDOWN FORCED DEFROST FORCED REFRIGERATION INHIBIT DEFROST NOTE 1 USE ITEM 106 TO SET OFF HEATER OR FANS NOTE 2 RL1 IS FOR LIGHTING CONTROL NOTE 3 USE ITEM 153 TO SELECT CONTROL AFTER DEFROST NOTE 4 USE ITEM 108 TO SELECT CONTROL DURING DEFROST Relay Output Rating This unit conforms with the relevant EU standards when fitted 2A resistive in accordance with its installation instructions Supply Requirements SUCCEEDS is the patented JTL algorithm for control of liquid 230 V ac 48 62 Hz Supply 3 VA maximum injection into an evaporator using electronic expansion valves Applicable Documentation PREDICT is the patented JTL pattern recognition algorithm for providing Item Numbers Firmware Variations Connections Diagram defrost on demand for the cabinets on a system Doc No 03880 Doc No 03881 Doc No 03790 ee ae schematiciblagram
4. as the high cabinet temperature alarm The tolerance is set on item 480 Excessive Superheat Alarms If the measured Superheat exceeds 50 C then a sensor fault is assumed and the maximum opening of the expansion valve is reduced to 33 of the maximum allowed When the measured Superheat is between 30 and 50 C the fault condition is activated if the suction temperature exceeds the air on temperature Network Shutdown and Fans Only Mode This controller supports the JTL Network shutdown and fans only facilities When these facilities are enabled by item 62 If a shutdown or fans only command is received over the JTL Network the refrigeration is stopped and alarms are disabled The high temperature alarm sequence is initialised Display Controlled Shutdown The controller can be shutdown for servicing purposes using the display switch This feature is enabled by item 138 Display Controlled Fans Only Mode The controller can be put into fans only mode using the display switch This feature is enabled by item 136 Timer Controlled Shutdown When used in conjunction with a JTL timer on the network the controller can be put into shutdown mode Item 238 is used to select the appropriate network timer and item 239 shows the associated network command state Suction Pressure Optimisation When used in conjunction with JTL pack control and suction optimisers this unit is normally included in the suction pressure optimiser algorithm It can be exp
5. of information has an item number The more important items are listed in the tables overleaf COTE To set item 31 to 20 0 press OO0sS202008 CANCEL Examples To read item 21 press To correct errors press To select next or previous items press Cana CONTROLLER TYPE UAPI INPUTS OUTPUTS SUPPLY VOLTAGE ac CoS IN VOVLOVV ON ELN 1413121110987654321 f SUPPRESSORS CABINET CONTROLLER MU DISPLAY Jnet Zone 15 16 17 18 19 20 21 22 23 24 25 26 27 28 VUVVVVOVVOVVOS 4 TEMPERATURE SENSORS PT1000 SUCTION PRESSURE Jnet Zone DOC 03879 ISS 1 Initial Commissioning and Bitswitch Settings The controller has 4 sets of data built in to its program for use during commissioning These can be accessed by setting the virtual bitswitches as shown in the table overleaf and then setting item 9 to 1234 The virtual bitswitches are set using item 966 This loads into the controller a suitable set of data for the selected type of case Adjustments should then be made as necessary The range over which the settings can be adjusted is also defined by the bitswitch setting If a JTL communications network is connected to the controller then the unit number should be set on item 1 Second Case Option The controller can control and monitor a single evaporator half glass door HCD and well case This option is selected on item 500
6. JTL USER GUIDE Electrical Installation Requirements Care should be taken to separate the power and signal cables to prevent electrical interference and possible damage due to inadvertent connection The power outputs are fitted with suppressors to protect against electrical interference when switching off solenoid valves or contactors It is therefore essential to observe the output polarity The line voltage should be connected to the terminals marked LN and the switched loads to LD The control supply neutral must be connected to terminal 1 for EMC operation The plant inputs are electrically isolated Voltage free closed contacts should be connected to the terminals for the logical conditions lighting normal and shutdown CE Conformance This unit conforms with the relevant EU standards when installed according to the JTL Installation Requirements for this product Inputs INPUT 1 LIGHTING NORMAL INPUT 2 Temperatures and Pressure AIR ON TEMP AIR OFF TEMP EVAPORATOR TEMP SUCTION LINE TEMP TERMINATION OR AIR ON 2 TEMP SUCTION PRESSURE Lighting normal operation discontinued from v0 00 3 firmware Outputs LIGHTING amp BLINDS CONTACTOR FANS HEATERS TRIM HEATER DEFROST PULSED EXPANSION VALVE Use of Maintenance Unit The controller can be checked and the operation adjusted using a JTL portable maintenance unit which plugs into the controller Each item
7. NTROL Cabinet temperature setpoint Effective air off setpoint Liquid valve open Average liquid valve open PULSED EXPANSION VALVE FUNCTIONS Force pressure average to current reading Suction pressure Superheat Auto zero offset Force PEV opening PEV valve opening PEV status Pressure transducer type Time since last override hr mn Duration of last override sec Modifier output Local pressure broadcast Current superheat method Current superheat strategy Jnet NETWORK FUNCTIONS Network shutdown and fans only command states Associated plant suction lin Trim heater adjustment Network timer command state Function MODE INPUTS amp OUTPUTS Operating mode PEV override input state Defrost output state Auxiliary output state Trim Heaters output LIGHTING Communications lighting command 261 272 Lighting override input state 219 Lighting output state 221 Force lights on 222 Force lights off 243 DEFROST Duration of last defrost Time since end of last defrost Duration of this defrost Communications defrost command Forced defrost nhibit defrost Forced refrigeration Learned defrost schedule Defrost arrangement from network Forced defrost requirement Enable forced defrost requirement PREDICT override av JTL USER GUIDE CONTROLLER TYPE UAPI OUTPUT STATE DIAGRAM FOR JTL CONTROLLER OUTPUT amp FUNCTION See note 2 MODE OF OPERATION AUXILIARY N O TRIM HEATER
8. Note The information contained in this document applies to the current version of the unit supplied with it Full operating manuals item number and software variation information can be obtained from your supplier or JTL Systems Doc No 03877 UAPI userguide wpd Issue 14 July 2015 www jtl co uk JTL Systems Ltd 41 Kingfisher Court Hambridge Road Newbury Berks RG14 5SJ Tel 01635 263646 Fax 01635 263647 JTL Help Desk Tel 0871 315 7535
9. Where the second case option is selected the second case unit number should be set on item 501 Temperature Display The temperature displayed is computed from the air on and air off temperatures A factor is used to proportion the air off and air on temperatures The temperature can be displayed in Celsius or Fahrenheit as selected by item 122 The UAPI controller will drive the following JTL displays when used with the CAB55 extension cable Display Cable switen LCD8 CAB55 LCD9 CAB55 Where the second case option is selected 2 displays can be driven This is selected using item 502 If this option is selected a JTL display splitter is required Either of the displays support the keyswitch function but it is not recommended that both displays be keyswitch type The LCD9 display incorporates a keyswitch This switch can be used to select various functions as described below A maximum of 2 additional functions can be selected On LCD9 if only one additional function is selected then it is available in either of the extra 2 positions The CAB55 cable is available in various lengths Refrigerant Type This controller will operate for Carbon Dioxide R744 and various HFC refrigerants as well as HCFC type R408A The refrigerant choice is made on item 157 Carbon Dioxide can be set for subcritical or transcritical operation it is essential that item 157 is set correctly as the controller automatically selects the correct pre
10. can be applied item 49 after defrost before the PEV is reopened A drain down time delay can be applied item 59 after defrost before the liquid valve is reopened During drain down if the auxiliary heater output is selected it is energised The display shows dEF JTL USER GUIDE Forced Refrigeration and Defrost The maintenance unit can be used to force controller into a particular mode This is done using items 77 79 While the maintenance unit is plugged in the controller will remain in the selected mode permanently Once the maintenance unit is unplugged the controller will revert to normal control after 30 minutes When the network initiated defrost strategy is selected forced defrost will send a command to the JTL defrost scheduler to initiate a defrost and does not act locally Fan Control If the fans are controlled item 106 set to 1 item then the fans can be controlled in various ways during and after defrost Item 108 specifies how the fans are controlled during defrost There are choices to run or stop the fans and also to cycle the fans on evaporator or termination temperature as set on item 146 Item 153 specifies how the fans are controlled during defrost recovery There are choices to run the fans immediately after a time delay item 109 and also to cycle the fans on evaporator or termination If when selecting temperature control the fan delay is also set then the fans are restarted after the delay regardless of
11. cted An override switch input facility is provided which raises the blinds and turns the lights on this function is discontinued from v0 00 3 firmware Load Shedding The controller has the ability to reduce the electrical load on request by network broadcast Up to 8 individual broadcast signals can be assigned to the following functions Inhibit defrost Inhibit refrigeration Fans off lights off Raise setpoint to alternative setpoint Reduce trim heat High Temperature Alarms The cabinet and air off temperatures are monitored continually The temperature errors are averaged over the period set on item 47 If either of the average temperature errors exceed the alarm level then an alarm is given which is shown on the display and available for remote indication on the JTL alarm system If the average cabinet temperature error exceeds half the alarm tolerance a warning alarm is given which is available on the JTL alarm system If this alarm is present during the last 24 hours for more than the set period a trend alarm is given which is also available on the JTL alarm system High temperature alarms are cancelled during defrost and defrost recovery CONTROLLER TYPE UAPI The cabinet temperature tolerance is set on item 32 and the air off tolerance on item 34 Setting either of these tolerances to 0 0 C disables the relevant alarm Low Temperature Alarms There is a low cabinet temperature alarm which generates in the same way
12. d The strategy choice is made on item 107 For learned backup the last 24 hours defrost operation is continuously monitored and the defrost schedule is learned For real time backup the defrost schedule as set up for real time defrost on items 51 56 is used If network communication fails the selected backup strategy is automatically used The unit reverts to network control whenever the network communications is operational The backup strategy is also invoked if the network signals that communications has failed to the defrost scheduler or if there is a fault at the defrost scheduler Defrost The defrost output relay is energised during the defrost period T he liquid solenoid is closed during defrost The auxiliary output can be selected for fan or heater control During defrost the fans can be stopped or the auxiliary heater energised A pump down delay can be applied item 61 before the defrost output and heater are energised During pump down the PEV output is deenergised The display shows dEF Defrost Termination The controller stays in defrost at least until the minimum defrost time on item 145 is exceeded If the termination temperature is reached before the minimum defrost time then the defrost heater is cycled Defrost Recovery When the termination temperature or time is reached the controller enters defrost recovery The heater is de energised The termination method can be chosen using item 144 A time delay
13. ducer b from broadcast The local transducer is enabled using item 340 When the transducer is disabled or faulty pressure is available from a broadcast The broadcast pressure can be viewed on item 341 If the local transducer is faulty or the broadcast failure timeout occurs the controller defaults to two temperature control and SUCCEEDS control from v0 01 2 and a transducer alarm is raised Pressure Transducer Failure Strategies There are 3 strategies set on item 177 1 Open circuit Automatic switch to 2 temperature control and raise transducer fault alarm 2 Auto zero adjust 3 Network zero range check against average plant pressure high pressure gives automatic switch to 2 temperature control Outside range raise transducer fault alarm All 3 strategies are subject to a 5 minute delay timer The delay is symmetrical i e the condition must be present clear for 5 minutes to set clear alarm CONTROLLER TYPE UAPI 7 bar transducers are alarmed at 5 psi and auto zero range limited to 7 5 psi 34 bar transducers are alarmed at 15 psi and auto zero range limited to 22 5 psi Auto switch to 2 temperature control is on upper limit of range i e 75 and 22 5 psi External Shutdown Facilities If item 273 is set on then when input 2 is energized the expansion valve is closed This override input is to prevent flooding back in the event of plant failure There is also a shutdown feature which can b
14. e enabled using item 174 High suction pressure on the transducer input can also shut the pulsed expansion valve Defrost Initiation Strategies The defrost strategy can be initiated in 2 fundamental ways using item 107 Defrost initiation can be by real time clock or by command on the JTL communications network Network initiated defrost can be divided into 3 groups PREDICT coordinated and scheduled This controller uses the PREDICT 1 method which monitors the PEV override operation PREDICT defrost requires that a JCL PREDICT defrost coordinator unit is available on the network This unit receives requests from the PREDICT controllers and coordinates these requests so that the defrosts are organised ensuring the electrical and refrigeration requirements are met When the controller requests a defrost the PREDICT coordinator will send out a defrost command at a suitable time If the backup strategy is invoked the controller reverts to real time schedule Coordinated timed defrost requires a defrost coordinator to be present in the network When coordinated timed request is selected then the controller requests a defrost as defined by the number of defrosts a day as set on item 69 The defrost coordinator coordinates the defrost as required The backup strategy can be chosen to fall to learned defrost schedule or real time backup Backup Defrost Initiation Strategies For network initiated defrost 2 defrost backup strategies are include
15. hod Defrost requirement priority PREDICT override initiation Defrost termination method Defrost termination temp Minimum defrost time Defrost termination time Drain down time Refrigeration delay after defrost DEFROST TERMINATION Auxiliary output Fan control during defrost Temperature to turn fans off during Fan delay after defrost Fan control after defrost FAN CONTROL Load shedding inhibit defrost inhibit refrigeration Fans off Light off Raise setpoint Reduce trim heat LOAD SHEDDING Control strategy TRIM HEATER CONTROL Normal percentage operation Night setback operation Load Shedding adjustment Jnet lighting control selection Select lights off broadcast timer Lighting contractor selection Enable lights during shutdown LIGHTING CONTROL Unit number Unit number second case Jnet network shutdown selection JNELFUNGTIONS Enable plant to cut off refrigeration Exclude from suction optimisation Select network shutdown timer Daylight saving operation Temperature display choice Enable fans only mode from display Enable display controlled shutdown Enable 2nd display Display Backlight Refrigerant type Pressure transducers zero offset DISPLAY Cabinet under temperature tolerance Cabinet temperature ratio second case Primary cabinet temperature setpoint Secondary cabinet temperature setpoint Number of defrosts expected or required Electrical supply distribution panel no
16. licitly excluded by setting item 200 to 1 Daylight Saving When connected to a JTL network this controller can operate by displaying daylight saving time for its time and defrost schedule Daylight saving operation is selected by setting item 18 The connected network controller then adjusts the times automatically during the daylight saving period JTL USER GUIDE TEMPS amp ALARMS CONTROL PULSED EXPANSION VALVE FUNCTIONS Cabinet temperature ratio Sensor selections Termination sensor selection Cabinet overtemperature tolerance Air off over temperature tolerance Alarm averaging time Cabinet temperature warning trend Cabinet overtemperature tolerance Control temperature Enable 2nd setpoint Air off temperature setpoint Temperature control deadband Auxiliary output selection Enable second case Superheat measurement method Superheat control strategy Superheat setpoint inimum superheat pressure inimum superheat 2 temperature aximum valve opening pressure inimum valve opening 2 temperat inimum valve opening EV proportional gain EV integral time constant igh suction pressure shutdown uto zero pressure enable ressure display choice EV override input isable local transducer Local pressure broadcast timeout Defrost strategy Pump down time Defrost schedule Defrost schedule 12 24 hour clock DEFROST Evaporator group INITIATION Defrost heater circuit Defrost met
17. ssure transducer 1 to 34 bar for subcritical CO2 0 60 bar for transcritical CO2 JTL USER GUIDE Control Strategy The controller can control to the cabinet temperature or the optimised air off temperature selected using item 275 by modulating the output to the pulsed expansion valve The control strategy for HGD well operation is that the temperature is controlled to the worst case of the 2 sections Each case section has its own temperature factor to enable the case temperature to be calculated from the air on and air off temperatures When the control temperature is set to air off the air off temperature is controlled to a computed setpoint shown on item 28 The computed air off temperature setpoint is calculated by comparing the displayed temperature with the cabinet temperature setpoint The computed setpoint is raised or lowered depending on whether the cabinet temperature is below or above the cabinet temperature setpoint The computed air off setpoint cannot go below the value set on item 31 The UAPI controller can be set to operate from 2 cabinet temperature setpoints by setting item 123 The setpoint to be used is then selected using the display keyswitch The setpoints are set on items 124 and 125 and the current setpoint is displayed on item 30 Superheat Control The superheat is calculated using the suction pressure and temperature A backup strategy uses the evaporator and suction line temperatures to calculate the s
18. the temperature Auxiliary Heater The controller supports the use of an auxiliary heater which stays on after defrost during drain down This heater uses the fan control output and is selected by setting item 106 to 2 Trim Heater Control The trim heaters can be controlled There are 4 separate strategies for control selected by item 390 a heater switched off when controller shutdown using display keyswitch b heater controlled to a fixed percentage output c heater controlled to a fixed percentage output which can vary in and out of trading hours d heater controlled with an adjustment received from the network The trim heater control is achieved by pulsing relay RL3 The pulse period in 400 seconds For example to achieve 75 output the heater is on for 300 s and off for 100s The percentage can be set for day operation item 392 for night setback item 393 and adjusted further by a network command from a trim heater optimiser on the JTL network item 394 The current percentage in operation is displayed on item 391 Lighting and Night Blind Control The cabinet lights and night blinds can be sequenced on and off by command from the JTL network There are two sources of the network command legacy or broadcast The broadcast timer if chosen is selected on item 112 The lights can be switched off from the display keyswitch if item 119 is set to 1 enabled The lights are switched off if either fans only or shutdown are sele
19. uperheat The superheat control can be set to operate in 3 ways using item 188 a SUCCEEDS In SUCCEEDS strategy the air temperature is controlled and the superheat allowed to float The pulsed expansion valve opening is controlled primarily using a Pl strategy on the control temperature The valve is opened and shut over a fixed period of time 6 25 s to meter the appropriate amount of refrigeration The proportional gain and the integral time constant for the PI control are adjustable b SUCCEEDS with limit The superheat is allowed to float to the maximum set on item 189 If the case control temperature error is negative and the superheat is greater than the maximum set on item 189 the expansion valve is closed It is reopened again with a deadband adjustment on item 140 c Fixed The superheat is controlled using PI control on the superheat temperature When the case temperature is achieved the PEV is shut It is reopened again with a deadband adjustment on item 140 In SUCCEEDS control if the superheat falls below the minimum level set on item 162 or 186 the PEV is progressively shut to effect recovery from excess liquid supply This is called override After override is complete ie superheat recovers PI control will be resumed but with a modified reduced value The modifier is shown on item 190 and the output to the PEV valve is shown on item 168 Suction Pressure The pressure has two source options a local trans
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