LAE electronic LF28 User manual

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.
1. INSTALLATION
1.1 LF28, size 105x90x55 mm (WxHxD), must be fitted to a DIN rail in such a position so as to prevent debris and moisture
infiltration which may cause serious damage and compromise safety.
1.2 The instrument should work with room temperatures between -10°.. +50°C and relative humidity between 15%.. 80% inclusive.
Supply voltage, switched powers and connection set-up should scrupulously comply with the indications given on the container. To
reduce the effects of electromagnetic disturbance, keep the flat connecting cable, the sensor and signal cables well separate from
the power wires.
1.3 The display unit LCD16 is secured to the panel by means of the two springs on the side of the box. The unit is mounted on the
panel through a 29x71 mm opening, exert a moderate pressure so as to get the LCD16 to align flush to the panel surface. The main
unit LF28 and the display unit LCD16 are connected to each other by means of the flat cable supplied in the package.
1.4 The sensor T1 measures the air temperature and activates in the thermostat control cycle; it should be placed inside the
appliance in a point that truly represents the temperature of the stored product. If enabled (T2=YES), the sensor T2 measures the
evaporator temperature and should be placed where there is the maximum formation of frost. If enabled (T3=YES), the sensor T3
should be located between the condenser fins, half way between the condenser inlet and outlet. The auxiliary sensor T4 can be used
to monitor the temperature of either a second evaporator (T4=2EU), or of a second condensing unit (T4=2CU) or disabled
(T4=NON).
CAUTION: should the relays have to switch a heavy load frequently, it is advisable to contact the manufacturer for indications on the
lifetime of the contacts.
Whenever products must be kept within very severe specifications or the products have considerable value, the use of a second
instrument is recommended, which activates upon or warns of any malfunction.
2. OPERATING MODES
Upon switching on, just the central line (autotest) appears on the display for approximately three seconds and the subsequent indications depend
on the operating status of the controller. TABLE 1 gives the indications associated with the various states, whereas the symbols appearing in the
text are explained in TABLE 2.
2.1 STANDBY.If button is pressed for 3 seconds, it allows the LF28 to be put on a standby, or to resume output control (with
INSTRUCTIONS FOR INSTALLATION AND USE.
LF28
0LLF28003EN
STANDBY NORMAL INFO MENU INFO DATA SETUP MENU PARAMETER
VALUE
OFF -19 T1 -20 SCL 1°C
Not Product Air Display scale
Operating Temper. (sim.) temperature
DEF T2 -25 SPL -25
Defrost Evaporator Minimum
temperature setpoint
REC - - - - - - SPH -18
Recovery after ... Maximum
defrost setpoint
HI TLO -19 - - - - - -
High temp. Min. stored ....
alarm temperature
- - - CND 15 - - - - - -
.... Condenser clean ....
cycle
E1 LOC NO - - - - - -
Faulty T1 probe Locked keypad
TABLE 1

parameter SB=YES only). An indication on the display shows that the outputs are off permanently.
2.2 NORMAL.During normal operation, the display shows the temperature measured by probe T1, presented in the most appropriate
manner. Parameter SCL may be adjusted in °C with auto-range (SCL=1°C), in °C with 1° fixed resolution (SCL=2°C) or in Fahrenheit
(SCL=°F). The measured temperature may be corrected with a fixed offset by assigning a value other than 0 to the parameter OS1,
the same procedure applies to probes T2, T3, T4, which may be corrected by the respective offsets OS2, OS3, OS4. Additionally,
prior to display, the temperature is treated by an algorithm that allows the simulation of a thermal mass directly proportional to the SIM
value. The result is a reduction in the fluctuation of the displayed value.
2.3 INFO MENU.Pressing the button and releasing it immediately activates the information selection menu. From this menu you
can display the instantaneous temperatures T1, T2, T3 and T4; the maximum (THI) and minimum (TLO) stored temperature; the total
operating time of the condenser since its last cleaning (CND) and the keypad status (LOC). The information to be displayed can be
selected sequencially, by pressing repeatedly or quickly via the buttons and to scroll through the menu. Exit from the info
menu is by pressing button or automatic after 6 seconds of not using the keypad.
In the INFO operating mode it’s also possibile to reset the recordings THI and TLO and the hour counter CND by pressing buttons
+ simultaneously while the value is displayed.
2.4 SETPOINT.The setpoint value is displayed by keeping the button pressed for at least half second. The programming range is
within the limits SPL and SPH. When the button is released, the newly programmed value will be stored immediately. The effective
setpoint values, minimum and maximum limits, will depend on the mode selected active at the time of the selection.
2.5 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 mode, through the buttons and it’s possibile to assign YES or NO to the
parameter LOC. With LOC=YES all keypad commands are inhibited. To resume normal operation of keypad, adjust setting so that
LOC=NO.
2.6 DEFROST.By assigning a value greater than 0 to the parameter DDY, during defrost the indication is displayed instead of
the temperature. In this case, after defrost and for the time programmed in DDY, the display indication shows that the normal
thermostatic cycle is being resumed.
2.7 ALARM.An anomaly in the operation is displayed through the lighting up of an abbreviation showing its cause:
/ high/low
alarm temperature in the cabinet, door open, condenser high pressure, condenser high temperature, periodic condenser
cleaning,
/// , fault of probe T1 / T2 / T3 / T4.
2.8 SETUP.The setup is accessed by pressing the buttons + in succession and keeping them pressed simultaneously for 5
seconds. The available parameters appear in TABLE 2 as shown below.
3. CONFIGURATION
The controller is configured for the system to be controlled by programming the operating parameters, that is, through the setup (see par.
2.8). In SETUP, press button to pass from one parameter to the next, and press button to go back. To display the value of a
parameter press , to modify it press buttons + or simultaneously. Exit from the setup is by pressing button or automatic
after 30 seconds of not using the keypad.
HP
INSTRUCTIONS FOR INSTALLATION AND USE.
Par. Adjustment Function Sect
SCL 1°C/2°C/°F Readout scale 2.2
SPL -40.. SPH [°] Minimum temperature set point 2.4
SPH SPL.. +40 [°] Maximum temperature set point 2.4
SP SPL.. SPH [°] Effective set point 4.1
HYS +0.1.. +10.0 [°] Thermostat hysteresis 4.1
CRT 0.. 30 [min] Compressor rest time 4.1
CT1 0.. 30 [min] Compressor run with sensor T1 failure 4.2
CT2 0.. 30 [min] Compressor stop with T1 failure 4.2
1)2CD 0.. 120 [sec] Start delay 2nd compressor 9.3
DFR 0.. 24 Defrost frequency /24h 5.1
DLI -40.. +40 [°] Defrost end temperature 5.3
DTO 1.. 120 [min] Maximum defrost duration 5.3
DTY OFF/ELE/GAS Defrost type 5.2
DRN 0.. 30 [min] Drain down time 5.4
DDY 0.. 60 [min] Defrost display control 2.6
FID YES/NO Fans active during defrost 6.3
FDD -40.. +40 [°] Fan re-start delay temperature 6.4
FTO 0 …120 [min] Evaporator fan maximum time-out 6.4
FTC YES/NO Evaporator fan timed control 6.1
FT1 0.. 180 [sec] Fan stop delay 6.1
Par. Adjustment Function Sect
ACC 0.. 52 [weeks] Periodic condenser cleaning 7.5
HDS 1.. 5 Sensitivity function eco / heavy duty 9.2
IISM NON/MAN/HDD/DI2 2nd set switching mode 9.1
2)IISL -40.. IISH [°] Minimum 2nd temperature set 2.4
2)IISH IISL.. +40 [°] Maximum 2nd temperature set 2.4
2)IISP IISL.. IISH [°] Effective 2nd temperature set 4.1
2)IIHY +0.1.. +10.0 [°] Hysteresis of 2nd temperature set 4.1
2)IIFT YES/NO Evaporator fan timed control in mode 2 6.1
2)IIDF 0.. 24 Defrost frequency /24h In mode 2 5.1
SB YES/NO Button enabling 2.1
DS YES/NO Door switch enabling 6.2
3)CSD 0.. 30 [min] Compressor stop delay from door opening 4.3
3)ADO 0.. 30 [min] Door alarm delay 7.2
DI2 NON/HPS/IISM/RDS Function digital input DI2 9.5
LSM NON / MAN / DOR Light switch mode 9.3
OAU NON/0-1/LGT/2CU/2EU/ALR Control of AUX output 9.4
OS1 -12.. +12 [°] probe T1 offset 2.2
T2 YES/NO Probe T2 enabling 1.4
OS2 -12.. +12 [°] Probe T2 offset 2.2
T3 YES/NO Probe T3 enabling 1.4

TABLE 2
1) Only with OAU=2CU; 2) Only with IISM different from NON; 3) Only with DS=YES.
*CAUTION: upon changing the display scale SCL, it is ESSENTIAL to reconfigure the parameters related to the absolute (SPL, SPH, SP,
etc.) and differential (HYS, ATL, ATH, etc.) temperatures.
4. THERMOSTAT CONTROL
4.1 Thermostat control is based on comparing the temperature T1, the set point *SP and the hysteresis *HYS.
Example: SP= 2.0; HYS= 1.5, compressor Off with T1= +2.0° and On with T1= +3.5° (2+1.5).
The compressor only switches On again if the Off time period determined by CRT since the previous switchover has elapsed. Whenever
a very small hysteresis HYS must be maintained, it is advised that a suitable value for CRT is selected in order to reduce the number of
starts per hour.
4.2 If sensor T1 fails, the compressor is controlled on a fixed time, through the parameters CT1 and CT2: CT1 determines the run time
and CT2 the rest time.
Example: with CT1=03 and CT2=06 the compressor will cycle 3 minutes On and 6 minutes Off.
Setting CT1=0 causes the compressor to be OFF all the time and, viceversa, with CT1 different from 0, and CT2=0 the compressor will
always be ON.
4.3 If door switch input control has been enabled (DS=YES), parameter CSD determines the delay between when the door is opened
and the compressor stopping.
* Actual setpoint and hysteresis depend on the selection I/II: in mode I, the reference parameters are SP and HYS while in mode II,
IISP and IIHY.
5. DEFROSTING
5.1 Defrosting starts automatically when necessary time has elapsed to obtain the defrosting frequency set with *DFR. For example,
with DFR=4 there will be 4 defrostings per 24 hours, so defrosting occurs once every 6 hours. With DFR=0 the timed defrosting function
is removed.
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 accumulated time count is “frozen” (is not incremented).
Defrosting may also be induced manually by pressing the button for 2 seconds or, with DI2=RDS, through the activation of an external
contact (remote defrost start).
During a High Pressure alarm (see par. 7.3 e 7.4) defrost is suspended.
5.2 Once defrost has started, the outputs are controlled according to parameter DTY as per the following table:
Table 3
5.3 The actual defrost duration and output activation is determined by a series of parameters.
5.3a. Time termination: T2=NO and T4 different from 2EU. In this case the evaporator temperature is not monitored and defrost
will always last as long as time DTO.
5.3b. Temperature monitoring of one evaporator: T2=YES and T4 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.
5.3c. Temperature monitoring of two evaporators: T2=YES, T4=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.
5.4 After defrost, if parameter DRN is greater than 0, before cooling starts all outputs will remain off for the time assigned to DRN.
INSTRUCTIONS FOR INSTALLATION AND USE.
DTY DEFROST COMPRESSOR
OFF Off Off
ELE On Off
GAS On On
Par. Adjustment Function Sect
FT2 0.. 30 [min] Timed fan stop 6.1
FT3 0.. 30 [min] Timed fan run 6.1
ATL -12.. 0 [°] Low alarm differential 7.1
ATH 0.. +12 [°] High alarm differential 7.1
ATD 0.. 120 [min] Alam temperature delay 7.1
AHT 0.. 75 [°] Condenser alarm temperature 7.3
AHM NON/ALR/STP Condenser high temperature alarm operation 7.3
Par. Adjustment Function Sect
OS3 -12.. +12 [°] Probe T3 offset 2.2
T4 NON/2CU/2EU Function auxiliary probe T4 1.4
OS4 -12.. +12 [°] Probe T4 offset 2.2
TLD 1.. 30 [min] Delay for min./max. temperature storage 8
SIM 0.. 100 Display slowdown 2.2
ADR 1.. 255 Peripheral address 9.6

This phase, called drain down, will allow a complete ice melting and the drain of the resulting water.
* The actual defrost frequency depends on the selection I/II: in mode I, the reference parameter is DFR while in mode II it’s IIDF.
6. EVAPORATOR FANS
6.1 During thermostatic control, the evaporator fans are controlled by parameter *FTC, FT1, FT2 and FT3.
With FTC=YES you enable an optimised fan control; the fans will operate in conjunction with the compressor and after the compressor
has stopped, the fans will be activated according to the time FT1 (recovery of accumulated cooling), after that they will be stopped for
the time FT2 (energy saving). When FT2 has elapsed, the fans will run for the time FT3 (whirling air stratifications).
Example: FT1=30, FT2=4, FT3=1. With those values the fans will cut-in together with the compressor and will stop 30 seconds after the compressor has
stopped; now, a 4 minute OFF and 1 minute ON cycle will take place till the compressor starts again.
With FT2=0 the fans will always be active. Viceversa, if FT2 is different from 0 and FT3=0, the fans will always be off.
With FTC=NO the optimised control is excluded, so the fans will run all the time.
6.2 If the LF28 is connected to a door switch and door switch control is enabled (DS=YES), during thermostatic control if the door is
opened, the fans will be stopped immediately.
6.3 During defrost, the fans are controlled by parameter FID; with FID=YES the fans remain on all through defrosting. With FID=NO,
the fans will be stopped and will only re-start when the conditions in paragraph 6.4 have been met.
6.4 After defrosting, if probe T2 is active (T2=YES), temperature FDD provides evaporator fan re-start. So the evaporator fans will not
run until the evaporator has a temperature lower than FDD. Viceversa, if either probe T2 is not active (T2=NO) or, after defrost
termination, such condition doesn't occur within the time FTO, the fans will however be switched on again.
* The way the fans will be controlled depends on the selection I/II: in mode Ithey work according to FTC, while in mode II the fans
work according to IIFT.
7. ALARMS
With LF28, correct operation of the refrigerator and thermostat may be monitored by a wide range of functional and diagnostics alarms,
individually selectable by means of the relevant parameters. The alarm warnings are given on the display through explicit indications
(see following par.), the auxiliary relay contacts open (if present in model and if OAU=ALR) and intermittent buzzer sounding. During an
alarm, by pressing any button, the buzzer is muted. Then, if the alarm persists, the buzzer will be periodically switched on for 20 seconds
every 60 minutes, until the alarm ends (the display indications remain on all the time). The repeated acoustic warning applies to all alarms
with the exception of the condenser cleaning alarm. Operation of the various elements is given in detail below.
7.1 ATL establishes the alarm differential for temperatures below set point, ATH the alarm differential for temperatures above set point
+ hysteresis. Putting one or both differentials to 0 cuts out the corresponding alarm.
Example: SP= -20, HYS= 2.0, ATL= -5.0, ATH= 5.0; the alarm thresholds are set at –25°(-20-5) and –13° (-20+2+5).
The alarm warning may be immediate or delayed by the time ATD whenever this is greater than 0. The indication for high temperature
and for low temperature alarm blinks on the display. The alarm indication remains stored in the display, even when the alarm is over,
until you acknowledge the alarm manually by pressing any button.
The high temperature alarm is bypassed during defrosting.
7.2
If a suitable door switch has been connected to detect the door status and door switch input control has been enabled (DS=YES), the door
open alarm function is enabled. In this way, if the door remains open the controller will react after the time delay set with ADO by displaying
the alarm source through the indication .
7.3 To monitor the condensing unit temperature to avoid gas pressure from getting too high, it’s necessary to secure the probe T3 to
the condenser firmly (see 1.4) and enable condenser probe control (T3=YES). If there is a second condensing unit in the plant and this
should be monitored (OAU=2CU), it’s necessary to secure the sensor T4 in the same way as the sensor T3 and to enable it with T4=2CU.
Parameter AHT determines the condenser temperature alarm threshold for one or both probes and parameter AHM determines the
reaction following the temperature rising over AHT. With AHM=ALR the only reaction will be the buzzer sounding, being displayed
and the alarm relay switched on. Alternatively, with AHM=STP, besides the alarm indication the compressor will be stopped immediately
and defrosts suspended.
With AHM=NON, all functions related to the High Temperature and High Pressure alarm (par. 7.4) are inhibited.
7.4 The correct operation of the condensing unit may not only be monitored via temperature (par. 7.3), but also through a safety
pressure switch. In this case, the digital input DI2 is to be used by programming DI2=HPS; in this way, when the pressure switch opens,
a high pressure alarm will be displayed combined with the alarm function programmed with AHM (ALR or STP).
7.5 Assigning a value greater than 0 to the parameter ACC enables the indication for periodic cleaning of the condenser. Subsequently,
when the count of compressor hours of operation reaches the equivalent in weeks set with ACC, an indication for cleaning appears on
the display.
Example: with ACC=16 there is a warning once every 16x7(weeks)x24(hours)=2688 hours of compressor operation, so, assuming for this an operation
with 5 minutes On and 5 minutes Off - after approx. 32 weeks.
In order to clear the time counter, follow the prescribed procedure in paragraph 2.3.
7.6 Upon failure of probe T1 or, if enabled, probes T2, T3 or T4, probe failure is signalled with the blinking indication or or
HP
INSTRUCTIONS FOR INSTALLATION AND USE.

or respectively.
8. TEMPERATURE STORAGE
The LF28 features a system for permanent storage of the minimum and maximum temperature logged during operation. This system is a valid
help to achieve compliance with the HACCP directive in its part relating to a correct preservation of foodstuffs. Temperature is measured by
probe T1 which should therefore be placed in a point where the temperature of the preserved product may always be measured correctly. The
logging is however subject to some simple rules that filter the data and give a rational interpretation. The logging is suspended during the
periods in which the refrigerator is put on a standby and during defrostings and, during the normal operation (thermostatic control), it’s “slowed
down” through the parameter TLD. This parameter defines the time during which the measured temperature must permanently exceed the
current value before the logging is performed. In this way, it will be possible to avoid idle loggings that don’t reflect the actual product
temperature, for example, the door remaining open for a short period of time, the temperature recovery after a defrost or other temporary
short term temperature huntings.
It is suggested that a reasonably long TLD time is programmed, for instance 5-15 minutes, you then put the product into the refrigerator and
start a new logging cycle by clearing previous values (see par. 2.3). It will now suffice that at regular intervals, in the INFO menu you check
the minimum and maximum logged values in order to know if the product has been kept within the required temperature limits.
9. AUXILIARY FUNCTIONS
9.1 In addition to the basic functions described above, the LF28 offers an innovative feature to enhance the performance of the
refrigerator. Infact, you can select the control parameters between two different pre-programmed
groups, in order for the fundamental
control parameters to be adapted quickly to changing needs such as, for example: High/Low Temperature range change, day/night
operation stored, product change (meat, fish, vegetables …), maximum cooling capacity or energy saving. The parameters switched over
in mode Iand II are: SPL, SPH, SP, HYS, DFR, FTC and IISL, IISH, IISP, IIHY, IIFT, IIDF.
With the parameter IISM you select if the changeover from Group I to Group II is made manually, via the button (IISM=MAN), or
automatically when heavy duty operation is detected (IISM=HDD), or when the auxiliary input D12 is activated (IISM=DI2), or inhibited
(IISM=NON). The activation of Group II is signalled by the lighting up of the relevant LED on the controller display.
9.2 The automatic detection of “heavy duty operation” allows the control parameters to be modified in response to the specific
temporary needs of the refrigerator, such as: warm food being put into the cabinet, door being opened frequently etc. Control sensitivity
to switch over from Group I to Group II is determined by parameter HDS (1=minimum, 5=maximum). An example of how to use such
function is reported in the following table:
If we apply the above example to a refrigerator in a restaurant kitchen the controller will use the parameters of Group I during the closing
times of the kitchen, when the need for cooling is minimum, therefore we can consider this as a “normal” operation condition. Group I
“economy control” parameters will ensure both an optimum foodstuff preservation and considerable energy saving. Alternatively, during
very busy periods (door being opened continuously to take out or load food), the controller will automatically select Group II to try and
maintain the average product temperature within correct values (lower setpoint), limit compressor wear by reducing the number of starts
(higher hysteresis), avoid long defrost pauses which will worsen the preservation condition (lower defrost frequency or no defrosts at all),
increase product cooling speed by keeping ventilation always active (IIFT=NO). When the heavy duty period is over, the controller will
automatically resort back to Group I.
NOTE: To make the automatic detection IISM=HDD work better, it is suggested that the value of hysteresis is not set too narrow (less than
2°K) or the value of CRT is not set too high (longer than 2 minutes).
9.3 if fitted, the auxiliary output can be programmed for the control of the refrigerator lights. Through the parameter LSM you select
how the lights are turned on: manually, through the button (LSM=MAN), or when the door is opened (LSM=DOR). With LSM=NON,
this function is disabled.
9.4 The operation of the auxiliary output, if fitted depending on the model, is controlled through the parameter OAU. With OAU=0-
1 the relay contacts follow the on/off status of controller (standby=OFF). With OAU=LGT, the output is used to control the refrigerator
lights (see 9.3).with OAU=2CU the output is programmed to drive the second condensing unit, i.e. an auxiliary compressor which is
piloted in parallel with the main compressor, and its start is delayed by an amount of seconds programmed with the parameter 2CD;
viceversa, the second compressor stops together with the main compressor. With OAU=2EU the output is enabled for the control of the
electrical defrost of the second evaporator (see par. 5.3) and finally, with OAU=ALR the output is connected to the alarm function, the
contacts are therefore closed during normal operation and open when an alarm condition occurs (reversed operation). With OAU=NON
the contacts remain open constantly.
PARAMETER GROUP IGROUP II
setpoint SP=-18 IISP=-21
Hysteresis HYS= 2.0 IIHY= 3.0
Defrost frequency DFR= 3 IIDF= 1.. 0
intermitt. fans FTC = YES IIFT= NO
INSTRUCTIONS FOR INSTALLATION AND USE.

MAIN COMBINATIONS
Manual control of lights: LSM=MAN, OAU=LGT.
Two compressors with temperature protection: OAU=2CU, 2CD=10 seconds, T3=YES, T4=2CU, AHM=STP.
Two compressors with pressure protection: OAU=2CU, 2CD=10 seconds, T3=NO, T4=NON, DI2=HPS, AHM=STP.
Two evaporators: OAU=2EU, T4=2EU, DTY=ELE.
9.5 The function performed by the second digital input DI2 is chosen among: HPS, safety pressure switch (see 7.4); IISM, parameter
group selection (see 9.2); RDS, start of defrost from a remote contact (see 5.1 and following).
If the DI2 inputs of two or more controllers must be linked to each other to establish a remote defrost start control, it’s mandatory to use
the optocoupled version (mod. LF28x3xx).
9.6 The controller is provided with a serial port for connection to a PC or a programmer. In the first case it is important to assign to the
parameter ADR a different value for each linked unit (peripheral address); with automatic programming, ADR should remain on 1.
Figure 1 Thermostat and fan operation
Figure 2 Defrost operation
SP+HYS
T1
ON
OFF
ON
OFF
SP
FT1 FT2 FT3 FT2 FT3
ON
OFF
DRN
ON
OFF
ON
OFF
START
DLI
EVP1
DLI
EVP2
DEF2
DEF1
INSTRUCTIONS FOR INSTALLATION AND USE.

7(2)A
Evaporator fan
Condenser fan
N
L
III
7(2)A
12÷24Vac
Evp 2
Evp 1
Cond.
DI2 DS T4 T2 T1 T3
remote
LCD16
max. total current 18A
12(4)A20(6)A
RS485
PC comm.
Aux
Switch Door Switch
Power
Supply
22 23 24 25 26 27 28 29 30 31
1716141510121113765432
WIRING DIAGRAM
LF28D3S4E-B
INSTRUCTIONS FOR INSTALLATION AND USE.
7(2)A
Evaporator fan
Condenser fan
N
L
III
7(2)A
Cond 2
Evp 1
Cond.1
DI2 DS T4 T2 T1 T3
remote
LCD16
max. total current 18A
12(4)A20(6)A
RS485
PC comm.
Aux
Switch Door Switch
Power
Supply
22 23 24 25 26 27 28 29 30 31
1716141510121113765432
LF28D2S4E-B
VIA PADOVA, 25
31046 ODERZO /TV /ITALY
TEL. [phone] - 815303
TELEFAX 0422 814073
www.lae-electronic.com
E-mail: [email protected]
PARTNER VENEZIA • 041 5460713