LAE LTR-5 Series Instructions For Use Manual page 50

AD2-28 INSTRUCTIONS FOR USE
Thank you for having chosen an LAE electronic product. Before installing the instrument, please read this instruction booklet
carefully in order to ensure safe installation and optimum performance.
DESCRIPTION INDICATIONS
Thermostat output
Fan output
Defrost output
Activation of 2nd parameter set
Alarm
Fig.1 - Front panel
Info / Setpoint button. Manual activation / Increase button.
Manual defrost / Decrease button. Exit / Stand-by button.
INSTALLATION
■ The AD2-28 controller, size 107x95x47 mm (WxHxD), is to be secured to a DIN rail in such a position as to ensure that no liquid
infiltrates causing serious damage and compromising safety.
■ Make sure that electrical connections comply with the paragraph "wiring diagrams". To reduce the effects of electromagnetic
disturbance, keep the sensor and signal cables well separate from the power wires.
■ Place the probe T1 inside the room in a point that truly represents the temperature of the stored product.
■ Place the probe T2 on the evaporator where there is the maximum formation of frost.
■ The function of probe T3 is determined by the parameter T3. With T3=DSP the probe measures the temperature to be displayed.
With T3=CND the probe measures the condenser temperature, it must therefore be placed between the fins of the condensing
unit. With T3=2EU the probe measures the temperature of the second evaporator and it must therefore be placed where there is
the maximum formation of frost. With T3=NON, the third probe is disabled.
OPERATION
DISPLAY
During normal operation, the display shows either the temperature measured or one of the following indications:
Defrost in progress Condenser high pressure alarm
Controller in stand-by Room high temperature alarm
Condenser clean warning Room low temperature alarm
Door open alarm Probe T1 failure
Condenser high temperature alarm Probe T2 failure
Probe T3 failure
INFO MENU
The information available in this menu is:
Instant probe 1 temperature Maximum probe 1 temperature recorded
*
Instant probe 2 temperature Minimum probe 1 temperature recorded
* **
Instant probe 3 temperature Compressor working weeks
Keypad state lock
*: displayed only if enabled (see §Configuration Parameters) **: displayed only if ACC > 0
Access to menu and information displayed. SETPOINT : display and modification
■ Press and immediately release button . ■ Press button for at least half second, to display the
■ With button or select the data to be displayed. setpoint value.
■ Press button to display value. ■ By keeping button
■ To exit from the menu, press button or wait for 10 seconds. desired value (adjustment is within the minimum SPL and the
Reset of THI, TLO, CND recordings maximum SPH limit).
■ With button or select the data to be reset. ■ When button is released, the new value is stored.
■ Display the value with button .
■ While keeping button pressed, use button .
STAND-BY
Button , when pressed for 3 seconds, allows the controller to be put on a standby or output control to be resumed (with SB=YES only).
KEYPAD LOCK
The keypad lock avoids undesired, potentially dangerous operations, which might be attempted when the controller is operating in
a public place. In the INFO menu, set parameter LOC=YES to inhibit all functions of the buttons. To resume normal operation of
keypad, adjust setting so that LOC=NO.
SELECTION OF SECOND PARAMETER GROUP
It's possible to select control parameters between two different pre-programmed groups, in order for the fundamental control
parameters to be adapted quickly to changing needs. Changeover from Group I to Group II (and vice versa) may take place
MANUALLY by pressing button for 2 seconds (with IISM=MAN), or AUTOMATICALLY when heavy duty conditions are detected
(with IISM=HDD), or when IISM=DI2 and the AUXILIARY INPUT DI2 is activated (the activation of DI2 selects Group II). If
IISM=NON, switchover to Group II is inhibited. The activation of Group II is signalled by the lighting up of the relevant LED on the
controller display.
DEFROST
Automatic defrost. Defrost starts automatically as soon as the time set with parameter DFT has elapsed.
■ Timed defrost . With DFM=TIM defrosts take place at regular intervals when the timer reaches the value of DFT. For example,
with DFM=TIM and DFT=06, a defrost will take place every 6 hours.
■ Optimized defrost . With DFM=FRO the timer is only increased when the conditions occur for frost to form on the evaporator, until
the time set with parameter DFT is matched. If the evaporator works at 0°C, defrost frequency depends on the thermal load and
climatic conditions. With setpoints much lower than 0°C, defrost frequency mainly depends on the refrigerator operating time.
■ Synchronised defrost . With DI2=DSY and when more units (models AD2-28x3xxx only) are linked to each other as per Fig.
3, synchronised defrosts of all linked controllers will take place. The first controller which will start defrost, will also get all other
controllers synchronised.
■ Defrost time count backup . At the power-up, if DFB=YES, the defrost timer resumes the time count from where it was left off before
the power interruption. Vice versa, with DFB=NO, the time count re-starts from 0. In stand-by, the accumulated time count is frozen.
Manual or remote defrost start. It's possible to manually start a defrost, by pressing button
started remotely, if DI2=RDS, through the making of the auxiliary contact DI2.
Defrost type. Once defrost has started, Compressor and Defrost outputs are controlled according to parameter DTY. If FID=YES,
the evaporator fans are active during defrost.
Defrost termination. The actual defrost duration is influenced by a series of parameters.
■ Time termination : T2=NO and T3 different from 2EU: the evaporator temperature is not monitored and defrost will last as long
as time DTO.
■ Temperature monitoring of one evaporator : T2=YES and T3 different from 2EU. In this case, if the sensor T2 measures the
temperature DLI before the time DTO elapses, defrost will be terminated in advance.
■ Temperature monitoring of two evaporators : T2=YES, T3=2EU, OAU=2EU. This function is for the control of two independent
evaporators and it switches off the individual heating of the evaporator which gets to temperature DLI first, waiting for the second
evaporator to get to that temperature before the time DTO elapses.
Resuming thermostatic cycle. When defrost is over, if DRN is greater than 0, all outputs will remain off for DRN minutes, in
order for the ice to melt completely and the resulting water to drain. Moreover, if probe T2 is active (T2=YES), the fans will re-start
when the evaporator gets to a temperature lower than FDD; Vice versa, if probe T2 is not active (T2=NO) or after defrost has
come to an end, such condition does not occur by end of the time FTO, after FTO minutes have elapsed the fans will be switched
on anyway.
Caution: if DFM=NON or C-H=HEA all defrost functions are inhibited; if DFT=0, automatic defrost functions are excluded. During
a high pressure alarm, defrost is suspended. During defrost, high temperature alarm is bypassed.
CONFIGURATION PARAMETERS
■ To get access to the parameter configuration menu, press button + for 5 seconds.
■ With button or select the parameter to be modified.
■ Press button to display the value.
■ By keeping button pressed, use button or to set the desired value.
■ When button is released, the newly programmed value is stored and the following parameter is displayed.
■ To exit from the setup, press button or wait for 30 seconds.
PAR RANGE DESCRIPTION
SCL 1°C; Readout scale.
2°C; 1°C (with INP=SN4 only): measuring range -50/-9.9 ... 19.9/80°C
°F 2°C : measuring range -50 ... 120°C
°F : measuring range -55 ... 240°F
Caution: upon changing the SCL value, it is then absolutely necessary to re-configure the
parameters relevant to the absolute and relative temperatures (SPL, SPH, SP, ALA, AHA, etc..).
SPL -50..SPH Minimum limit for SP setting.
SPH SPL...120° Maximum limit for SP setting.
SP
SPL... SPH Setpoint (value to be maintained in the room).
C-H REF; HEA Refrigerating (REF) or Heating (HEA) control mode.
HYS 1...10°
OFF/ON thermostat differential.
ON
OFF
Refrigerating control (C-H=REF)
CRT
0...30min Compressor rest time. The output is switched on again after CRT minutes have elapsed since the
previous switchover. We recommend to set CRT=03 with HYS<2.0°.
CT1
0...30min Thermostat output run when probe T1 is faulty. With CT1=0 the output will always remain OFF.
CT2 0...30min Thermostat output stop when probe T1 is faulty. With CT2=0 and CT1>0 the output will always be ON.
Example: CT1=4, CT2= 6: In case of probe T1 failure, the compressor will cycle 4 minutes ON and 6 minutes OFF.
CSD 0..30min Compressor stop delay after the door has been opened (active only if DS=YES).
DFM NON; Defrost start mode
TIM; NON : defrost function is disabled (the following parameter will be FID).
FRO TIM : regular time defrost.
FRO : the defrost time count is only increased when the conditions occur for frost to form on the
evaporator (optimised time increase).
DFT 0...99 hours Time interval among defrosts. When this time has elapsed since the last defrost, a new defrost cycle is started.
DFB NO/YES Defrost timer backup. With DFB=YES, after a power interruption, the timer resumes the count from where
it was left off with ±30 min. approximation. With DFB=NO, after a power interruption, the defrost timer will
re-start to count from zero.
DLI
-50...120° Defrost end temperature.
DTO
1...120min Maximum defrost duration.
DTY OFF; Defrost type
ELE; OFF: off cycle defrost (Compressor and Heater OFF).
GAS ELE: electric defrost (Compressor OFF and Heater ON).
GAS: hot gas defrost (Compressor and Heater ON).
DPD 0...240sec Evaporator pump down. At the beginning of defrost, defrost outputs (determined by DTY) are OFF for
DPD seconds.
DRN 0...30min Pause after defrost (evaporator drain down time).
DDM RT; Defrost display mode. During defrost the display will show:
pressed, use button or to set the
LT; RT: the real temperature;
SP; LT : the last temperature before defrost;
DEF SP : the current setpoint value;
DEF : "dEF".
DDY 0...60min Display delay. The display shows the information selected with parameter DDM during defrost and for
DDY minutes after defrost termination.
FID NO/YES Fans active during defrost.
FDD
-50...120° Evaporator fan re-start temperature after defrost.
FTO 0...120min Maximum evaporator fan stop after defrost.
FCM NON; Fan mode during thermostatic control.
TMP; NON : The fans remain ON all the time;
TIM TMP : Temperature-based control. The fans are ON when the compressor is ON. When the compressor
is turned OFF, the fans remain ON as long as the temperature difference Te-Ta is greater than FDT. The
fans are turned ON again with FDH differential. (Te = Evaporator temperature, Ta = Air temperature);
TIM : Timed-based control. The fans are
ON when the compressor is ON. When the
compressor is OFF, the fans switch ON and
OFF according to parameteres FT1, FT2,
FT3 (See Fig.2).
Fig.2 Time-optimised fan control (FCM=TIM)
FDT -120...0° Evaporator-Air temperature difference for the fans to turn OFF after the compressor has stopped.
FDH 1...120° Temperature differential for fan re-start.
Example: FDT = -1, FDH=3. In this case, after the compressor has stopped, the fans are OFF when Te
> Ta - 1 (FDT), whereas the fans are ON when Te < Ta - 4 (FDT-FDH).
FT1 0...180sec Fan stop delay after compressor stop. See Fig. 2
FT2 0...30min Timed fan stop. With FT2=0 the fans remain on all the time.
FT3 0...30min Timed fan run. With FT3=0, and FT2 > 0, the fans remain off all the time.
ATM
NON; Alarm threshold management.
for 2 seconds, or defrost may be
ABS; NON : all temperature alarms are inhibited (the following parameter will be ADO).
REL ABS : the values programmed in ALA and AHA represent the real alarm thresholds.
REL : the values programmed in ALR and AHR are alarm differentials referred to SP and SP+HYS.
ON
OFF
SP-ALR SP
Temperature alarm with relative thresholds,
refrigerating control (ATM=REL, C-H=REF).
ALA
-50... 120°
Low temperature alarm threshold.
AHA -50... 120°
High temperature alarm threshold.
ALR
-12... 0°
Low temperature alarm differential. With ALR=0 the low temperature alarm is excluded.
AHR 0... 12°
High temperature alarm differential. With AHR=0 the high temperature alarm is excluded.
ATI T1; T2; T3
Probe used for temperature alarm detection.
ATD 0... 120min
Delay before alarm temperature warning.
ADO 0... 30min
Delay before door open alarm warning.
AHM
NON; Operation in case of high condenser alarm
ALR; NON : high condenser alarm inhibited.
STP; ALR : in case of alarm, "HC" flashes in the display and the buzzer is switched on.
STP : in addition to the alarm symbols displayed, the compressor is stopped and defrosts are suspended.
AHT
ACC
IISM
IISL
IISH
IISP
IIHY
ON
IIFC
OFF
HDS
SP SP+HYS T[°] SP-HYS SP T[°]
IIDF
Heating control (C-H=HEA)
LSM
OA1
OA2
2CD
INP
OS1
OS2
OS3
TLD
SIM
ADR
COMPR. COMPR. OFF COMPR.
ON ON
WIRING DIAGRAMS
ON
OFF
FT1 FT2 FT3 FT2 FT3
ON
T[°]
T[°]
OFF
SP+HYS+AHR SP
SP-HYS-ALR SP+AHR
Temperature alarm with relative thresholds,
heating control (ATM=REL, C-H=HEA).
-50...120°
Condensation temperature alarm (referred to T3 probe).
0...52 Condenser periodic cleaning. When the compressor operation time, expressed in weeks, matches the
weeks ACC value programmed, "CL" flashes in the display. With ACC=0 the condenser cleaning warning is
disabled and CND disappears from Info Menu.
NON; Switchover mode to second parameter set
MAN; NON : inhibition to use the second parameter group (the following parameter will be SB).
HDD; MAN : button switches the two parameter groups over.
DI2 HDD : automatic switchover to the second parameter group, when heavy duty conditions are detected.
DI2 : switchover to the second parameter group when the auxiliary DI2 input makes.
-50... IISH Minimum limit for IISP setting.
IISL... 120°
Maximum limit for IISP setting.
IISL... IISH Setpoint in mode 2.
1... 10° OFF/ON differential in mode 2.
NON;TMP;
Fan control in mode 2. See FCM.
TIM
1...5 Controller sensitivity for the automatic switchover from Group I to Group II (1=minimum, 5=maximum).
0...99 hours Time interval among defrosts in mode 2.
SB
NO/YES Stand-by button enabling.
DS
NO/YES Door switch input enabling (closed when door is closed).
DI2 NON; DI2 digital input operation
HPS; NON : digital input 2 not active.
IISM; HPS : when contact opens a condensing unit high pressure alarm occurs.
RDS; IISM : when contact makes the controller will use group 2 parameters.
DSY RDS : when contact makes a defrost is started (remote control).
DSY : defrost synchronisation. The controllers, linked as per Fig. 3, will all start and end defrost together.
The first controller in defrost will get defrost of all the others started. The last controller ending defrost will
get defrost of all the others stopped.
NON; Light control mode
MAN; NON : light output not controlled.
DOR MAN : light ouput controlled through button (if OAx=LGT).
DOR : light ouput switched on when door is opened (if OAx=LGT).
NON; AUX 1 output operation
0-1; NON : output disabled (always off).
LGT; 0-1 : the relay contacts follow the on/standby state of controller.
2CU; LGT : output enabled for light control.
2EU; 2CU : output programmed for the control of an auxiliary compressor.
AL0; 2EU : output enabled for the control of the electrical defrost of a second evaporator.
AL1 AL0 : contacts open when an alarm condition occurs.
AL1 : contacts make when an alarm condition occurs.
See OA1 AUX2 output operation. See OA1.
0...120 sec Auxiliary compressor start delay. If OAx=2CU the auxiliary output is switched on with a delay of 2CD
seconds after the main compressor has cut-in. Both compressors are turned off at the same time.
SN4; ST1 Temperature sensor selection. With INP=SN4, the probes must be the LAE models SN4..; with INP =
ST1, the probes must be the LAE models ST1...
-12.5..12.5°C Probe T1 offset.
T2
NO/YES Probe T2 enabling (evaporator).
-12.5..12.5°C Probe T2 offset.
T3 NON; Auxiliary probe T3 operation
DSP; NON : probe T3 not fitted.
CND; DSP : temperature T3 to be displayed.
2EU CND : condenser temperature measurement.
2EU : second evaporator temperature measurement.
-12.5..12.5°C Probe 3 offset.
1...30 min Delay for minimum temperature (TLO) and maximum temperature (THI) logging.
0...100 Display slowdown.
1...255 AD2-28 address for PC communication.
-
+ - +
remote data 33 32 31 29 30 28 27 26 remote data 33 32 31 29 30 28 27 26 remote
DI2 Door T2 T1 T3 DI2 Door T2 T1 T3
AD2-28C1S5E-B AD2-28C1S5E-B AD2-28C1S5E-B
AUX1 AUX2 AUX1 AUX2
19 9 10 11 7 8 6 1 2 19 9 10 11 7 8 6 1 2
Fig.3 Connection for synchronising defrost start and termination
LCD-5S RS485
PC comm.
DI2 Door
A
Aux
B
remote data I/O 33 32 31 29 30 28 27 26
T2 T1 T3
AUX 1 AUX 2
16(8)A 16(4)A 8(2)A 7A 7A
Maximum total current 17.5A
14 15 16 17 18 19 9 10 11 7 8 6 1 2
FUSE
N
L
Power
Supply
Evaporator fan
Condenser fan
AD2-28C1S5E-B
TECHNICAL DATA
Power supply
AD2-28....D 12Vac/dc ±10%, 3W
AD2-28....E 230Vac±10%, 50/60Hz, 3W
AD2-28....U 115Vac±10%, 50/60Hz, 3W
Relay output max loads (240Vac)
AD2-28..S/T..-. AD2-28..Q/R..-.
Compressor 16A resistive 12A resistive
8 FLA 48 RLA 8 FLA 48 RLA
Evap. Fan 8A resistive 8A resistive
2 FLA 12 RLA 2 FLA 12 RLA
Defrost 16A resistive 12A resistive
Auxiliary loads 1 7A resistive 7A resistive
Auxiliary loads 2 7A resistive 7A resistive
Input
NTC 10KΩ@25°C LAE Part No. SN4...
PTC 1000Ω@25°C LAE Part No. ST1...
Measurement Range
-50...120°C, -55...240°F
-50 / -9.9 ... 19.9 / 80°C (NTC10K only)
Measurement accuracy
<0.5°C within the measurement range
Operating conditions
-10 ... +50°C; 15%...80% r.H.
CE - UL (Approvals and Reference norms)
EN60730-1; EN60730-2-9; EN55022 (Class B);
EN50082-1
SA32385, UL 60730-1A
-
+
data 33 32 31 29 30 28 27 26
DI2 Door T2 T1 T3
AUX1 AUX2
19 9 10 11 7 8 6 1 2
107
47
VIA PADOVA, 25
31046 ODERZO /TV /ITALY
TEL. +39 - 0422 815320
FAX +39 - 0422 814073
www.lae-electronic.com
E-mail: sales@lae-electronic.com