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JTL USER GUIDE CONTROLLER TYPE: LAPI

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1. 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 The 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 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 Forced Refrigeration and Defrost The maintenance unit can be used to force controlle
2. E SET ON ITEM 109 REACHED Relay Output Rating Note The information contained in this document applies to the current 5A resistive version of the unit supplied with it Full operating manuals item number and software variation information can be obtained from your Supply Requirements supplier or JTL Systems 230 V ac 48 62 Hz Supply 6 VA maximum inputs 2 MA maximum Applicable Documentation i Item Numbers Firmware Variations Connections Diagram This unit conforms with the relevant EU standards when Doc No 03396 Doc No 03404 Doc No 03408 fitted in accordance with its installation instructions Evaporator Manual Installation Requirements Schematic Diagram Doc No 01923 Doc No 03036 Doc No 03491 SUCCEEDS is the patented JTL algorithm for control of liquid injection into an evaporator using electronic expansion valves PREDICT is the patented JTL pattern recognition algorithm for providing defrost on demand for the cabinets on a system 03397 LAPI wpd Issue 5 Aug 2014 Doc No 03397 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
3. 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 NO or NC The plant inputs are electrically isolated A line voltage should be connected for the logical conditions lighting override and shutdown The terminals marked should be connected to the supply voltage neutral CE Conformance This unit conforms with the relevant EU standards when installed according to the JTL Installation Requirements for this product Inputs Input CON 2 INPUT 1 LINE SHUTDOWN NEUTRAL INPUT 2 LINE NEUTRAL LIGHTING OVERRIDE AIR ON TEMP AIR OFF TEMP SUCTION LINE EVAPORATOR ENERGY SAVING OR TERMINATION AIR ON 2 TEMP SUCTION PRESSURE LIGHTING amp BLINDS CONTACTOR FANS HEATERS TRIM HEATER 4 NO OUTPUT 4 O LOAD DEFROST 4 LN LINE 4NC N C LOAD 5 NO OUTPUT 5 O LOAD PULSED EXPANSION 5 LN LINE VALVE Use of Maintenance Unit The controller can be checked and the operation adjusted using a JTL portable maintenance unit which plugs into t
4. Night Blind Control The cabinet lights and night blinds can be sequenced on and off by command from the JTL network An override switch input facility is provided which raises the blinds and turns the lights on 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 selected High Temperature Alarms The cabinet and air off temperatures are monitored continually The temperatures are averaged over the period set on item 47 If either of the average temperatures exceeds the alarm level then an alarm is given which is shown on the display and available for remote indication on the JTL alarm system High temperature alarms are cancelled during defrost and defrost recovery 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 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 c
5. 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 The air off temperature is controlled to a computed setpoint shown on item 28 by controlling pulsed expansion valve 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 OUTPUT 1 OUTPUT 2 OUTPUT 3 OUTPUT 4 OUTPUTS 5 INPUT 1 INPUT 2 230V iph N 50Hz 1A TEMPERATURE CONS a ALI SENSORS EVAPORATOR SUCTION TERMINATION JAI ON2 SUCTION PRESSURE 2 o LN CON4 m BL JTL NETWORK 4 CON66 WIRING CON8 TO JTL DISPLAY BL Nt JTL NETWORK CON2 CONSS RD WIRING CON7 TO JTL DISPLAY CON10 CONS L CON1 E A MAINTENANCE UNIT DOC 03071 ISS 2 The LAPI 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 Supeheat Control Th
6. e displayed in Celsius or Fahrenheit as selected by item 122 The LAPI controller will drive the following JTL displays when used with the CAB55 extension cable Display cable switen Lcos caBss Lobe 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 CONTROLLER TYPE LAPI 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 CO R744 operation is only allowed for frozen food applications and requires the pressure transducer to be selected as 1 to 34 bar item 175 set to 3 Other refrigerants require the transducer to be 1 to 7 bar item 175 set to 4 Control Strategy The controller can control to the cabinet temperature or the air off temperature selected using item 275 The control strategy for HGD well operation is that the temperature is
7. e evaporator and suction line temperatures to calculate the superheat 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 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 1 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 be 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 i
8. e 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 PI 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 that 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 all cases 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 The superheat is calculated using the suction pressure and temperature A backup strategy uses th
9. he controller Each item of information has an item number The more important items are listed in the tables overleaf EBS To set item 31 to 20 0 press 2OUS60800e To correct errors press To select next or previous Examples To read item 21 press items fs 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 bitswitches as shown in the table overleaf and then setting item 9 to 1234 From v0 01 3 this controller has virtual bitswitches which replace the physical bitswitches 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 From v0 01 1 firmware the controller can control and monitor a single evaporator half glass door HCD and well case This option is selected on item 500 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 b
10. n O disabled 1 enabled Unit number 0 1 899 8 Unit number second case 0 1 899 8 Jnet network shutdown selection O disabled 1 enabled Enable plant to override temp control O off 1 0n Enable plant to cut off refrigeration O disabled 1 enabled Exclude from suction optimisation O include 1 exclude Daylight saving operation O standard time 1 daylight saving time Bitswitch settings 21 o CC Frozen food CO 1 CO Frozen food HFC 2 0C Chillers HFC 3 00 Produce HFC where C closed O open closed dot visible 0 to 3 is the virtual bitswitch setting on item 966 OTHER USEFUL ITEMS TEMPERATURES PULSED EXPANSION VALVE FUNCTIONS MODE INPUTS amp OUTPUTS DEFROST Cabinet temperature Force pressure average to current reading Operating mode Duration of last defrost Air on temperature Suction pressure PEV override input state Time since end of last defrost Air off temperature Superheat Defrost output state Duration of this defrost Evaporator temperature Auto zero offset Auxiliary output state Communications defrost command Suction line temperature Force PEV opening LIGHTING Forced defrost Cabinet temperature second case PEV valve opening Communications lighting Inhibit defrost Air on temperature second case PEV status command Forced refrigeration Energy saving temperature Time since last override hr mn Lighting override input state 261 272 Learned defrost schedule Termination sensor temperature Duration of last o
11. nto 3 groups PREDICT coordinated and scheduled This controller uses the PREDICT 1 method which monitors the PEV override operation PREDICT defrost requires that a JTL 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 included 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
12. ommand 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 Daylight Saving The controller can be put into fans only mode using the display switch This When connected to a JTL network this controller can operate by displaying feature is enabled by item 136 daylight saving time for its time and defrost schedule Daylight saving operation is selected by setting item 18 The connected network controller then adjusts Suction Pressure Optimisation the times automatically during the daylight saving period 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 explicitly excluded by setting item 200 to 1 ADJUSTABLE PARAMETERS Cabinet temperature ratio 20 to 80 Sensor selections O off 1 0n Termination sensor selection O off 1 0n Cabinet overtemperature tolerance O to 20 Air off over temperature tolerance 0 to 30 Alarm averaging time 00 30 to 03 00 Cabinet temperature rate second case 20 100 Cabinet overtemperature tolerance second case 0 120 Control temperature 1 Air off 2 cabinet temp Enable 2nd setpoint O disabled 1 enabled Primary cabinet tempe
13. orator group O none 1 Lt 2 Ht 3 Satellite 5 210 Electrical supply distribution panel no 1 to 15 panel no fy 213 Defrost heater circuit 1 15 circuit Wi 214 Defrost method 0 brown phase 1 black phase 2 grey phase 3 3 phase 6 off cycle Defrost requirement priority 1to8 PREDICT Minimum time between defrosts 2to8 PREDICT Maximum time between defrosts 6 to 72 PREDICT override initiation 0 100 Defrost termination method 1 Evaporator 2 Air off 3 Termination 4 Time only Defrost termination temp O to 20 Minimum defrost time 00 00 00 30 Defrost termination time 00 05 to 00 59 Drain down time 00 00 to 00 10 Refrigeration delay after defrost 00 00 to 00 10 DEFROST TERMINATION 2 Fan control 1 run always 2 off during defrost 3 fan controlled during defrost e Temperature to turn fans off during defrost 12 to 20 5 Fan delay after defrost 00 00 00 10 o Temperature to turn fans on after defrost 20 to 5 Fan control sensor selection O disabled 1 enabled E Fan control temperature setpoint 30 to 8 LIGHTING CONTROL Jnet FUNCTIONS Temperature display choice 0 Celsius 1 Fahrenheit Enable fans only mode from display O disabled 1 enabled Enable display controlled shutdown O Off 1 On Enable 2nd display 0 Disabled 1 Enabled DISPLAY Jnet lighting control selection O disabled 1 enabled Lighting contractor selection O0 n o 1 N C Enable lights during shutdow
14. r 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 The fans can be controlled in various ways f item 108 is set to fans off during defrost then during defrost recovery the fans can be controlled depending on the evaporator temperature or time delay after defrost If item 109 is set to 00 00 when the evaporator temperature is low enough the fans start There is a5 degree deadband If item 109 is set to a time then the fans are held off until the time delay has occurred f item 108 is set to fan control during defrost the fans are turned off during defrost when the evaporating temperature goes above the setting on item 146 After defrost the fans are turned on when the evaporating temperature falls below the setting on item 150 or the time delay on item 109 if it is not set to 00 00 f energy saving is selected using item 130 then the fans will be cycled during normal refrigeration When the energy saving temperature item 131 goes below the energy saving setpoint item 132 the fans stop There is a deadband of 0 5 C Lighting and
15. rature setpoint 30 to 10 Secondary cabinet temperature setpoint 30 to 10 Air off temperature setpoint 39 to 5 Temperature control deadband 0 4 to 3 0 Auxiliary output selection O off 1 Fan 2 Heater Enable second case O Disabled 1 Enabled CONTROL TEMPS amp ALARMS i Refrigerant type 3 9 R type shown on MU display Pressure transducers zero offset 7 to 7 Superheat measurement method 1 2 temperature 2 pressure Superheat control strategy O SUCCEEDS 1 SUCCEEDS with limit 2 fixed Superheat setpoint 6 0 12 0 Minimum superheat pressure 0 10 Minimum superheat 2 temperature 0 5 Maximum valve opening pressure 10 100 Minimum valve opening 2 temperature 5 50 Minimum valve opening 0 50 PEV proportional gain 1 100 PEV integral time constant 1 250 High suction pressure shutdown O disabled 1 enabled Pressure transducer type 3 1 to 34 bar 4 1 to 7 bar Auto zero pressure enable O disabled 1 auto 2 network Pressure display choice 1 psi 2 bar 3 kPa PEV override input O disable 1 enable PULSED EXPANSION VALVE FUNCTIONS Defrost strategy O none 2 Network learned backup 3 Time 5 PREDICT 7 Network real time backup 8 Coordinated learned 9 Coordinated real time 69 umber of defrosts expected or required 0 to 12 61 Pump down time 00 00 00 10 2 51 56 Defrost schedule 00 01 23 59 60 Defrost schedule 12 24 hour clock 0 24hr 1 12hr Z 211 Evap
16. verride sec Lighting output state 219 Defrost arrangement from network CONTROL Modifier output Force lights on 221 Forced defrost requirement Cabinet temperature setpoint Force lights off 222 Enable forced defrost requirement Effective air off setpoint 243 PREDICT override average Liquid valve open Jnet NETWORK FUNCTIONS Average liquid valve open 63 Network shutdown and fans only command states Associated plant suction lin OUTPUT STATE DIAGRAM FOR JTL CONTROLLER LAPI OUTPUT amp FUNCTION See note 5 AUXILIARY N O can be set to TRIM HEATER N O DEFROST C O PULSED EXPANSION MODE OF OPERATION run always 108 VALVE N O See Note 2 Solid state output REFRIGERATION ON CYCLES See note 3 ON AIR OFF TEMPERATURE PUMP DOWN Adjustable time 61 DEFROST Time temp terminated CYCLES 571 150 ON TERMINATION TEMP DRAIN DOWN Adjustable time 59 LIQUID HOLD OFF Adjustable time 49 RECOVERY TIME Time temp TEMPERATURE CYCLES terminated OR TIME ON TEMPERATURE CONTROLLED See Note 6 m o lt oZOAS gt AmMO AmmMmA SZ2nmOCZ REFRIGERATION ON CYCLES See note 3 ON TEMPERATURE ne lt 1 ae ee ge OFF OFF O OFF CYCLES ON TEMPERATURE ON TEMPERATURE FORCED REFRIGERATION INHIBIT DEFROST NOTE 2 CAN BE SET TO OFF USING ITEM 106 NOTE 3 CAN CYCLE ON ENERGY SAVING TEMPERATURE SELECTED NOTE 5 RL1 IS FOR LIGHTING CONTROL BY ITEM 130 NOTE 6 FANS OFF UNTIL TIM

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