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AR2-27 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.
Stand-by button.
INSTALLATION
■
The AR2-27 controller, size 71x97x61 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
Recovery after defrost
Room high temperature alarm
Controller in stand-by
Room low temperature alarm
Condenser clean warning
Probe T1 failure
Door open alarm
Probe T2 failure
Condenser high temperature alarm
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
Minutes of the Real Time Clock
Keypad state lock
Hours of the Real Time Clock
*: displayed only if enabled (see §Configuration Parameters) **: displayed only if ACC > 0
Access to menu and information displayed.
■
Press and immediately release button
.
■
With button
or
select the data to be displayed.
■
Press button
to display value.
■
To exit from the menu, press button
or wait for 10 seconds.
Reset of THI, TLO, CND recordings
■
With button
or
select the data to be reset.
■
Display the value with button
.
■
While keeping button
pressed, use button
.
SETPOINT (display and modification of desired temperature value)
■
Press button
for at least half second, to display the setpoint value.
■
By keeping button
pressed, use button
or
to set the desired value (adjustment is within the minimum SPL and the
maximum SPH limit).
■
When button
is released, the new value is stored.
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.
REAL TIME CLOCK SETTING
The Real Time Clock (RTC) can be adjusted directly from the Info Menu (see Setpoint modification procedure). Tens of minutes
MIN range from 0 to 59 and Hours HRS range from 0 to 23. If RTC is adjusted just before an upcoming change of hour, verify the
correctness of the setting again. The RTC does not automatically change upon Daylight Saving Time.
DEFROST
Automatic defrost. Defrost starts automatically at fixed time-intervals or at programmed scheduled (up to six per 24 hours).
■
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.
■
Scheduled defrost
. With DFM=RTC defrost takes place at time specified by DH1...DH6. The format of time is "HH.M", where
HH are hours and M are tens of minutes. To disable one or more of the 6 scheduled defrosts, assign the value "---" (it is the value
after "23.5"). Parameters DH1...DH6 are accessible both in the setup (see §Configuration Parameters) and by keeping button
pressed for 4 seconds during normal operation.
. With DI2=DSY and when more units AR2-27 are linked to each other as per Fig. 3 (see parameter table),
■
Synchronised defrost
synchronised defrosts of all linked controllers will take place. The first controller which will start defrost, will also get all other
controllers synchronised.
■
Manual or remote defrost start
. If DFM=TIM it's possible to manually start a defrost, by pressing button
DFM=RTC hold button
down for 4 seconds to display DH1, then press button
again for 4 seconds to manually start a defrost.
Defrost may be also 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 (see figure).
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
DEF1
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
DEF2
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
SP
SP+HYS
T[°]
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).
2CD
0...120sec
Auxiliary compressor start delay. If OAU=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.
DFM
NON;
Defrost start mode
TIM;
NON : defrost function is disabled (the following parameter will be FID).
RTC
TIM : regular time defrost.
RTC : the defrost time is scheduled by parameters DH1, DH2...DH6.
DFT
0...99 ore
Time interval among defrosts. When this time has elapsed since the last defrost, a new defrost cycle is
started.
DH1
HH.M
Scheduled time for defrost 1. HH hours from midnight, M tens of minutes. Accepted values go from 00.0
to 23.5. After "23.5" the value is "---" that means "skipped defrost". Example: DH1=8.3 means 8.30 AM
DH2
HH.M
Scheduled time for defrost 2
DH3
HH.M
Scheduled time for defrost 3
DH4
HH.M
Scheduled time for defrost 4
DH5
HH.M
Scheduled time for defrost 5
DH6
HH.M
Scheduled time for defrost 6
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).
DRN
0...30min
Pause after defrost (evaporator drain down time).
DDY
0...60min
Display during defrost. If DDY=0 during defrost the temperature continues to be displayed. If DDY>0,
during defrost the display shows DEF, when defrost is over REC is displayed during DDY minutes.
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.
FTC
NO/YES
Optimised fan control enabling. With FTC = NO the fans remain on all the time.
CMP ON
ON
OFF
FT1
FT2
Fig.2 Optimised fan control (FTC=YES)
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 4 seconds. If
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
T[°]
OFF
SP-ALR
SP
SP+HYS+AHR
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.
ON
OFF
ATI
T1; T2; T3
Probe used for temperature alarm detection.
DLI
ATD
0... 120min
Delay before alarm temperature warning.
EVP1
ADO
0... 30min
Delay before door open alarm warning.
ON
AHM
NON;
Operation in case of high condenser alarm
OFF
ALR;
NON: high condenser alarm inhibited.
STP;
ALR: in case of alarm, "HC" flashes in the display and the buzzer is switched on.
DLI
STP: in addition to the alarm symbols displayed, the compressor is stopped and defrosts are suspended.
EVP2
AHT
-50...120°
Condensation temperature alarm (referred to T3 probe).
ON
ACC
0...52
Condenser periodic cleaning. When the compressor operation time, expressed in weeks, matches the
OFF
ACC value programmed, "CL" flashes in the display. With ACC=0 the condenser cleaning warning is
weeks
D N
disabled and CND disappears from Info Menu.
HDS
1...5
Controller sensitivity for the automatic switchover from Group I to Group II (1=minimum, 5=maximum).
IISM
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
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.
IISL
-50... IISH
Minimum limit for IISP setting.
IISH
IISL... 120°
Maximum limit for IISP setting.
IISP
IISL... IISH
Setpoint in mode 2.
IIHY
1... 10°
OFF/ON differential in mode 2.
IIFT
NO/YES
Optimised fan control enabling in mode 2.
IIDF
0...99hours
Defrost timer set to start a defrost in mode 2.
SB
NO/YES
Stand-by button
DS
NO/YES
Door switch input enabling (closed when door is closed).
ON
DI2
NON;
DI2 digital input operation
HPS;
NON : digital input 2 not active.
OFF
IISM;
HPS: when contact opens a condensing unit high pressure alarm occurs.
SP-HYS
SP
T[°]
RDS;
IISM : when contact makes the controller will use group 2 parameters.
Heating control (C-H=HEA)
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 mode will get defrost of all the others started. The last controller ending
defrost will get defrost of all the others stopped.
LSM
NON;
Light control mode
MAN;
NON : light output not controlled.
DOR
MAN : light ouput controlled through button
DOR : light ouput switched on when door is opened (if OAU=LGT).
OA1
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.
OA2
See OA1
AUX2 output operation. See OA1.
INP
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...
OS1
-12.5..12.5°C Probe T1 probe.
T2
NO/YES
Probe T2 enabling (evaporator).
OS2
-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.
OS3
-12.5..12.5°C Probe 3 offset.
TLD
1...30 min
Delay for minimum temperature (TLO) and maximum temperature (THI) logging.
SIM
0...100
Display slowdown.
ADR
1...255
AR2-27 address for PC communication.
WIRING DIAGRAMS
230Vac
RS485
12 11
data I/O
CMP OFF
CMP ON
Maximum total
current 15A
17
18
19
20
21
FT3
FT2
FT3
N
L
-
+
12
11
data
7
8
DI2
AR2-27C35E-AG
ON
17
18
19
20
21
15
T[°]
OFF
SP-HYS-ALR
SP
SP+AHR
Temperature alarm with relative thresholds,
heating control (ATM=REL, C-H=HEA).
switches the two parameter groups over..
enabling.
(if OAU=LGT).
Aux
Door
Aux Switch
Door
230Vac
TTL
12 24Vac
...
Switch
Switch
Switch
Aux
7
8
6
4
5
2
3
1
12 11
data I/O
7
8
6
4
5
2
3
DI2
Door
T1
T2
T3
DI2
Door
T1
T2
T3
AUX1
AUX2
AUX1
AUX2
15(5)A
7(2)A
7(2)A
7(2)A
7(2)A
15(5)A
7(2)A
7(2)A
7(2)A
Maximum total
current 15A
15
16
22
13 14
23 24
17
18
19
20
21
15
16
22
13 14
23 24
N
L
AR2-27C25E-BG
-
-
+
+
6
4
5
2
3
1
12
11
data
7
8
6
4
5
2
3
1
12
11
data
7
8
6
4
5
2
Door
T1
T2
T3
DI2
Door
T1
T2
T3
DI2
Door
T1
T2
AUX1
AUX2
AUX1
AUX2
AUX1
AR2-27C35E-AG
AR2-27C35E-AG
16
22
13
14
23
24
17
18
19
20
21
15
16
22
13
14
23
24
17
18
19
20
21
15
16
22
13
14
Fig.3 Connection for synchronising defrost start and termination
TECHNICAL DATA
Power supply
AR2-27...D
12Vac/dc ±10%, 3W
AR2-27...E
230Vac±10%, 50/60Hz, 3W
AR2-27...U
115Vac±10%, 50/60Hz, 3W
Relay output
Compressor
15(5)A 240Vac
Evap. Fan
7(2)A 240Vac
Defrost
7(2)A 240Vac
Auxiliary loads 1
7(2)A 240Vac
Auxiliary loads 2
7(2)A 240Vac
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
Real Time Clock battery
>150 hours; self-rechargeable
Operating conditions
-10 ... +50°C; 15%...80% r.H.
CE (Reference norms)
EN60730-1; EN60730-2-9;
EN55022 (Class B);
EN50082-1
Front protection
IP55
61
61
Aux
1
7(2)A
AR2-27C15E-AG
3
1
T3
AUX2
23
24
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
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