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;
2°C;
°F
Readout scale.
1°C (with
INP
=SN4 only): measuring range -50/-9.9 … 19.9/80°C
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°
Differenziale OFF/ON del termostato.
SP
SP+HYS
T[°]
ON
OFF
SP
SP-HYS
T[°]
ON
OFF
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;
TIM;
RTC
Defrost start mode
NON : defrost function is disabled
(the following parameter will be
FID
).
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;
ELE;
GAS
Defrost type
OFF: off cycle defrost (Compressor and Heater OFF).
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.
OFF
ON
CMP ON
CMP ON
CMP OFF
FT1
FT2
FT3
FT3
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;
ABS;
REL
Alarm threshold management.
NON: all temperature alarms are inhibited (
the following parameter will be
ADO
).
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
.
SP
T[°]
SP+HYS+AHR
SP-ALR
ON
OFF
SP
T[°]
SP+AHR
SP-HYS-ALR
ON
OFF
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.
Regolazione in refrigerazione (
C-H
=REF)
Regolazione in riscaldamento (
C-H
=HEA)
Temperature alarm with relative thresholds,
heating control (
ATM
=REL,
C-H
=HEA).
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
Codice LAE SN4...
PTC 1000Ω@25°C
Codice LAE 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
VIA PADOVA, 25
31046 ODERZO /TV /ITALY
TEL. +39 - 0422 815320
FAX +39 - 0422 814073
www.lae-electronic.com
E-mail: [email protected]
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;
ALR;
STP;
Operation in case of high condenser alarm
NON: high condenser alarm inhibited.
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
-50...120°
Condensation temperature alarm (referred to T3 probe).
ACC
0...52
weeks
Condenser periodic cleaning. When the compressor operation time, expressed in weeks, matches the
ACC
value programmed, “CL” flashes in the display. With
ACC
=0 the condenser cleaning warning is
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;
MAN;
HDD;
DI2
Switchover mode to second parameter set
NON: inhibition to use the second parameter group (
the following parameter will be
SB
).
MAN: button switches the two parameter groups over..
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 enabling.
DS
NO/YES
Door switch input enabling (closed when door is closed).
DI2
NON;
HPS;
IISM;
RDS;
DSY
DI2 digital input operation
NON : digital input 2 not active.
HPS: when contact opens a condensing unit high pressure alarm occurs.
IISM : when contact makes the controller will use group 2 parameters.
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;
MAN;
DOR
Light control mode
NON : light output not controlled.
MAN : light ouput controlled through button (if
OAU
=LGT).
DOR : light ouput switched on when door is opened (if
OAU
=LGT).
OA1
NON;
0-1;
LGT;
2CU;
2EU;
AL0;
AL1
AUX 1 output operation
NON : output disabled (always off).
0-1 : the relay contacts follow the on/standby state of controller.
LGT : output enabled for light control.
2CU : output programmed for the control of an auxiliary compressor.
2EU : output enabled for the control of the electrical defrost of a second evaporator.
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;
DSP;
CND;
2EU
Auxiliary probe T3 operation
NON: probe T3 not fitted.
DSP: temperature T3 to be displayed.
CND: condenser temperature measurement.
2EU: second evaporator temperature measurement.
OS3
-12.5..12.5°C Probe 3 offset.
TLD
1...30 min
Ritardo nella memorizzazione delle temperature minime (TLO) e massime (THI) raggiunte.
SIM
0...100
Display slowdown.
ADR
1...255
AR2-27 address for PC communication.
WIRING DIAGRAMS
AR2-27C25E-BG
6
4 5
3
2
12 11
230Vac
RS485
data I/O
Aux Switch
...
12 24Vac
7
8
DI2
1
T3
Aux
22 13 14
16
21
20
19
18
17
N
L
15
15(5)A
Maximum total
current 15A
7(2)A
7(2)A
7(2)A
7(2)A
23 24
AUX2
AUX1
T2
T1
Door
Switch
Door
AR2-27C15E-AG
6
4 5
3
2
12 11
230Vac
TTL
data I/O
Aux
Switch
7
8
DI2
1
T3
Aux
22 13 14
16
21
20
19
18
17
N
L
15
15(5)A
Maximum total
current 15A
7(2)A
7(2)A
7(2)A
7(2)A
23 24
AUX2
AUX1
T2
T1
Door
Switch
Door
6
6
6
4
4
4
5
5
5
3
3
3
2
2
2
12
12
12
11
11
11
7
-
-
-
+
+
+
7
7
8
8
8
DI2
DI2
DI2
1
1
1
T3
T3
T3
22
22
22
13
13
13
14
14
14
16
16
16
21
21
21
20
20
20
19
19
19
18
18
18
17
17
17
AR2-27C35E-AG
AR2-27C35E-AG
AR2-27C35E-AG
15
15
15
23
23
23
24
24
24
AUX2
AUX2
AUX2
AUX1
AUX1
AUX1
T2
T2
T2
T1
T1
T1
Door
Door
Door
data
data
data
Fig.3 Connection for synchronising defrost start and termination
OFF
OFF
OFF
ON
ON
ON
EVP1
EVP2
DLI
DLI
DRN
START
DEF1
DEF2
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.
Synchronised defrost
■
. With
DI2
=DSY and when more units AR2-27 are linked to each other as per Fig. 3 (see parameter table),
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
for 4 seconds. If
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
OPERATION
The AR2-27 controller, size 72x94x47 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.
INSTALLATION
Thermostat output
Fan output
Alarm
Defrost output
Activation of 2nd parameter set
Info / Setpoint button.
Fig.1 - Front panel
Manual defrost / Decrease button.
Manual activation / Increase button.
Stand-by button.
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
AR2-27 INSTRUCTIONS FOR USE
