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The digital input is used to read a light sensor (actually an analogue input, from which a digital signal is taken using the parameter or
threshold of the light sensor). The light sensor may be located:
• in the door stop,
• inside the cold room or cabinet.
In the fi rst case, , the sensor signals the opening and the closing of the door, because, with the door open, light is signalled, and
with the door closed, darkness is signalled (the sensor is located in the door stop and thus will be shadowed when the door is
closed). The inside light will be automatically switched on when the door is open and switched off when the door is closed. The
light stays OFF for a minimum time of 5 seconds, to avoid rapid, successive impulses of the light relay.
To select this operating mode, set AF=0.
In the second case, the light sensor signals the opening of the door of the cold room or the cabinet due to the outside light that
the sensor detects, thus activating the inside light. The closing of the door is measured by time, as the light inside the cold room
or cabinet will illuminate the sensor. After time AF (greater than 0), the inside light is switched off for 5 seconds. If the light sensor
signals darkness, the door must be closed and the light will therefore remain OFF. Otherwise, the door is still considered open and
the light is switched on again. To select this operating mode, set AF>0.
A4 =12 Activation of the AUX output
The digital input is used to activate/deactivate the AUX output, if confi gured with parameter H1 or H5, with the following logic:
Digital input
AUX output
open
deactivation
close
activation
The output is activated/deactivated on closing/opening the contact, to make this operating mode
compatible with the presence of the AUX button and the control signal from the supervisor.
Note:
if more than one digital input is confi gured as AUX, the open status occurs when at least one of the inputs switches to open
status.
A4 =13 Door switch with compressor and fans off and light not managed.
Same as for A4=5, with the diff erence that the light output is not modifi ed.
Note:
1. the door management algorithm depends on the parameter ' A do' .
2. if more than one digital input is confi gured as the door switch, the door open status will be considered when at least one of the
inputs is open.
A4 =14 Door switch with fans only off and light not managed.
Same as for A4=9, with the diff erence that the light output is not modifi ed.
Note:
for A4/5= 13 or 14: the Ado door management algorithm is used in both cases.
Default: A4=0 => Digital input not active (for all other models).
The table below summarises the functions of the digital input corresponding to the value assigned to the variable A4.
Value of A4
Function
0
input not active
1
immediate external alarm
2
delayed external alarm
3
for model M, select probes
3
other models, enable defrost
4
start defrost
5
door switch with compressor and fans OFF
6
remote ON/OFF
7
curtain switch
8
low pressure switch
9
door switch with fans OFF only
10
direct / reverse
11
light sensor
12
activation of AUX output
13
door switch with compressor and fans off , light not
managed
14
door switch with fans only off , light not managed
Note:
• if more than one digital input is confi gured in the same way, the activation of the associated function will be enabled if at least
one of these is open.
• for control with two compressor steps (with or without rotation, H1=12 or 13) the function associated with the digital inputs is
activated on both.
A5: Confi guration of the second multifunction digital input.
For this parameter the same description relating to parameter A4 is valid, obviously referring to the second digital input. Default:
A5=0 => Digital input not active.
A6: Stop compressor from external alarm (multifunction input)
The meaning of this parameter is similar to that of parameter c4 (duty setting).
If an external alarm occurs (immediate or delayed), the compressor works for a time equal to the value set for parameter A6 (in
minutes), while it remains OFF for a fi xed period of 15 minutes.
Special cases:
A6=0 the compressor is always OFF;
A6=100 the compressor is always ON.
From ser. no.:
Tab. 7.h
Function active
open = alarm
open = alarm
open = probe selected by parameter /tI closed =
fi rst probe enabled
closed= enabled
closing = defrost request
open = door open
open = instrument off
closed = curtain closed
open = low pressure
open = door open
open = direct
above the threshold = off
open = deactivation
open = door open
open = door open
Page:28
LED on
open
open
Tab. 7.h
Ed.1" 08-2014
560001 EG
Doc. No.:
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