Lae AT2-5 User Manual

AT2-5 INSTRUCTIONS FOR USE

Thank you for having chosen a LAE electronic product. Before installing the instrument, please read these instructions carefully to ensure maximum performance and safety.

DESCRIPTION INDICATIONS

Thermostat output

Fan output

Auxiliary output

Activation of 2nd parameter set

Alarm

Fig.1 — Front panel

Info / Setpoint but ton. Increase / manual activation but ton.

Manual defrost / Decrease button. Exit / Stand-by button.

INSTALLATION

Inser t the controller through a hole measuring 71x29 mm. Make sure that electrical connec tions 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.

Fix the controller to the panel by means of the suitable clips, by pressingly gently; if ﬁ tted, check that the rubber gasket

adheres to the panel perfec tly, in order to prevent debris and moisture inﬁ ltration to the back of the instrument.

Place the probe T1 inside the room in a point that truly represents the temperature of the stored produc t. Place the probe T2 on the evaporator where there is the maximum formation of fros t.

OPERATION

DISPLAY

During normal operation, the display shows either the temperature measured or one of the following indications :

DEF

Defrost in progress

Room high temperature alarm

REC

Recovery after defrost

Room low temperature alarm

OFF

Controller in stand-by

Probe T1 failure

Condenser clean warning

Probe T2 failure

Door open alarm

INFO MENU

The information available in this menu is :

Instant probe 1 temperature

TLO

Minimum probe 1 temperature recorded

Instant probe 2 temperature

CND

Compressor working weeks

THI

Maximum probe 1 temperature recorded

LOC

Keypad state lock

Access to menu and information displayed.

Press and immediately release but ton . 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 but ton . While keeping button

pressed, use button

SETPOINT (display and modiﬁ cation 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 controllers 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 dif ferent pre-programmed groups, in order for the fundamental control parameters to be adapted quickly to changing needs. With IISM=MAN, changeover from Group I to Group II takes place manually by pressing button

for 2 seconds. The activation of Group II is signalled by the lighting up of the relevant LED on

the controller display. If IISM=NON, switchover to group II is inhibited.

DEFROST Timed defrost. Defrosting star ts automatically when necessary time has elapsed to obtain the defrosting frequency set with DFR (IIDF). For example, with DFR=4 defrosting oc curs once every 6 hours. The internal timer is set to zero when power is

applied to the controller and at each subsequent defrost start. When the controller is put on a standby, the a ccumulated time count is “frozen” (is not incremented ).

Manual defrost. Defrosting may also be induced manually by keeping the button

pressed for 2 seconds.

Defrost type. Once defrost has star ted, Compressor and Defrost outputs are controlled according to the parameter s DTY and OAU. The AUX output is associated to defrost function with OAU=DEF exclusively. If FID=Y ES the evaporator fans are active all through defrost.

Defrost termination. Defrost lasts as long as time DTO but, if the evaporator probe has been enabled (T2=YES) and temperature DLI is achieved before this time elapses, defrost will be terminated in advance.

Resuming thermostatic cycle. When defrost is over, if DRN is greater than 0, all outputs will remain of f 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 such condition does not occur after 4 minutes following defros t termination, the fans will be switched on anyway.

Caution: if C-H= HEA all defrost functions are inhibited; if DFR= 0 the timed defrost function is excluded; during defrost, the high temperature alarm is inhibited.

CONFIGURATION PARAMETERS

The setup menu is accessed by pressing button X+!for 5 seconds. With button !or !select the parameter to be modiﬁ ed. 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, pres s but ton

or wait for 30 seconds.

PAR

RANGE DESCRIPTION

SCL

1°C; 2°C;

°F

Readout scale. 1°C (only wit h INP=SN4 ): measuring r ange - 50/ -9 .9 … 19 .9/80 °C 2°C : measuring r ange - 50 … 120°C °F : measuring range -5 5 … 240° F

Caut ion: upon changing the SCL value, it is then absolutely necessary t o reconfigure t he parameters relevant to t he absolute and relative temperatures ( SPL, SPH, SP, AL A, AHA, etc .. )

SPL

-50..SPH Minimum limit for SP setting

SPH

SPL .120 ° Maximum limit for SP sett ing

SPL ... SPH Setpoint (value t o be maintained in the room ).

C-H

REF ; HEA Refrigerating (R EF ) or Heating (HE A) cont rol mode

HYS

1...10 ° OFF /ON thermostat differen tial

OFF

SP SP+HY

T[°]

OFF

SPSP-HY

T[°]

Refrigerating control ( C-H= REF ) Heating cont rol ( C-H=HEA)

CRT

0.. .30min Compressor rest time . The output is s witched on again af ter CRT minu tes have elapsed since the previous swi tchover. We recommend to set CRT= 03 with HYS<2.0°.

CT1

0.. .30min Ther mostat output run when probe T1 is faul ty. With CT1= 0 the output w ill always remain OFF.

CT2

0.. .30min Ther mostat output s top when probe T1 is fault y. Wi th CT2=0 and CT1>0 t he outpu t wil l always be ON. Example : CT1=4, CT2= 6 : In case of probe T1 failure, t he compressor will cycle 4 minutes ON and 6 minutes OFF.

CSD

0.. 30min Compr essor st op delay af ter t he door has been opened (ac tive only if DS=YES).

DFR

0.. . 24(1/2 4h ) Defro st f requency expressed in cycles /24 hour s.

DLI

-50...120° Defrost end temperature.

DTO

1...12 0min Max imum defrost duration.

DTY

OFF; ELE; GAS

Defrost ty pe OFF : off cycle defros t (Compressor and Heater OFF) . ELE: electric de frost * (Compressor OF F and Heater ON) . GAS: ho t gas defrost * (Compressor and Heater ON). * The de frost output is acti ve if only OAU =DEF.

DRN

0.. .30min Pause aft er defros t (evaporator drain down t ime).

DDY

0.. .60min Display during defros t. If DDY=0 during def ros t the temperature cont inues to be displayed. If DDY > 0, during defrost the display show s DEF, and at the end of defros t it shows R EC for DDY minut es.

FID

NO/ YES Fans ac tive during def rost.

FDD

-50...120° Evaporator fan re -star t tempera ture af ter defrost.

FTC

NO/ YES Optimised fan cont rol enabling. W ith FTC = NO the fans remain on all the time

OFF

FT3FT3 FT2FT2FT1

CMP ON CMP OFF CMP ON

Fig. 2 Opt imised fan cont rol (FTC=YES)

FT1

0.. .180 sec Fan stop delay af ter compressor s top. See F ig. 2 .

FT2

0.. .30min Timed fan s top. With FT2= 0 the fans remain on all the time.

FT3

0.. .30min Timed fan run. W ith FT3= 0, and FT2 > 0, the fans remain off all the time.

ATM

NON; ABS;

REL

Alar m threshold management . NON : all temperature alar ms are inhibited (the follow ing parameter will be ADO). ABS : the values programmed in ALA and AHA represent the real alarm t hresholds. REL : the values programmed in ALR and AHR are alarm differen tials referred to SP and SP+HY.

OFF

T[°]

OFF

T[°]

Tempera ture alarm with relative thresholds, Temperat ure alarm wi th relative t hresholds, refrigerat ing control (ATM =REL, C-H = REF) . heating control ( ATM= REL, C-H=HEA).

ALA

-50... 12 0° Low tempera ture alarm t hreshold .

AHA

-50... 12 0° High temperature alarm threshold.

ALR

-12.. . 0° Low temperature alarm dif ferential. W ith ALR= 0 the low temperature alar m is excluded.

AHR

0.. . 12° High temperature alarm differen tial. Wi th AHR=0 t he high temperat ure alarm is excluded.

ATD

0.. . 120min Delay bef ore alarm temperature warning.

ADO

0.. . 30min Delay before door open alarm war ning .

ACC

0...52

weeks

Condenser periodic cleaning. When the compressor operation time, expressed in weeks, matches the ACC value programmed, “CL” flashe s in the display. With ACC= 0 the condenser cleaning warning is disabled.

IISM

NON;

MAN;

Swi tchover mode to second parameter set NON : inhibition to use the second paramet er group (the follo wing parameter wil l be SB).

MAN: but ton

swi tches the t wo paramet er groups over.

IISL

-50...IISH

Minimum limit f or IISP setting.

IISH

IISL...120°C

Maximum limit for IISP sett ing.

IISP

IISL ... IISH

Setpoin t in mode 2

IIHY

1...10°

OFF /ON dif ferent ial in mode 2.

IIFT

NO/YES

Optimised fan cont rol enabling in mode 2.

IIDF

0...99hours

Defrost timer set to star t a defrost in mode 2.

NO/YES

Stand-by butt on enabling

NO/ YES Door switch input enabling (closed when door is closed) .

LSM

NON; MAN;

DOR

Light con trol mode NON : light ou tput not controlled.

MAN : ligh t oupu t controlled through butt on

(if OAU=LGT).

DOR : light ouput s witched on when door is opened (if OAU=LGT).

OAU

NON;

0-1; DEF; LGT; AL0;

AL1

AUX output operation. NON : ou tpu t disabled ( always off ). 0-1 : the relay cont acts foll ow the on /standby state of con troller. DEF : output programmed f or defrost contr ol. LGT : output enabled for light control. AL 0 : contact s open w hen an alarm condition occurs. AL1 : contacts make when an alarm condit ion occurs.

INP

SN4 ; ST1 Temperat ure sensor selec tion. Wi th I NP = SN4, the probes must be the L AE models SN4 ..; wit h INP = ST1, the probes

must be the L AE models ST 1...

OS1

-12.5..12 .5°C Probe T 1 offse t.

NO/ YES Probe T2 enabling (evaporator) .

OS2

-12.5..12 .5°C Probe T 2 offset.

TLD

1...30 min Delay for minimum temperature ( TLO) and maximum temperature (THI) logging.

SIM

0...100 Display slowdown.

ADR

1...255 AT2-5 address for PC communication.

WIRING DIAGRAM

TECHNICAL DATA

Power supply

AT2-5…E 23 0Vac±10 %, 50 /60 Hz, 3W AT2-5…U 115Vac ±10%, 5 0/60 Hz, 3W AT2-5…D 12Vac /dc±10 %, 3W

Relay outputs

AT2-5.Q… Compressor 12( 5)A 240vac AT2-5.S… Compressor 16 (5) A 240vac Evaporat or fans 7 (2)A 24 0vac Aux iliary loads 7(2 )A 2 40vac

AT2-5.Q… maximum to tal current 12 A AT2-5.S… maximum total curren t 16A

Inputs

NTC 10K 1@ 25°C, L AE part No . SN4... PTC 1000 1@2 5°C, L AE part No. ST1…

Measurement Range

-50…120 °C, -55…24 0°F

-50 / -9.9 … 19.9 / 8 0°C (N TC10K onl y)

Measurement accuracy

<0 .5°C wi thin the measurement range

Operating conditions

-10 … + 50 °C; 15% ... 80% r.H.

CE – UL (Approvals and Reference Norms)

EN6 0730-1; E N607 30-2- 9; EN5 5022 (Class B ); EN50082-1 UL 607 30 -1A

Front protection

IP55

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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16(5)A

TTL

T1ComT2

7(2)A 7(2)A

AUX

34512

78 91110

Door

Switch

AT2-5BS4E-AG

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