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ENG
ir33plus +0300028EN rel. 1.1 - 05.05.2017
5. FUNCTIONS
5.1 Probes (analogue inputs)
The ir33+ platform controllers feature a maximum of 4 analogue inputs,
which are used for NTC, high temperature NTC (NTC Enhanced Range)
or PTC temperature sensors (see the note below). Probes S3 and S4 can
also be con gured as digital inputs. Probe S1 is the control probe and its
function cannot be changed; the functions of probes S2, S3, S4 can be
selected using parameters /A2, /A3, /A4. The probes can be calibrated
to adjust their readings. In particular, parameters /c1 to /c4 are used to
increase or decrease the values read by the probes connected to inputs
S1, S2, S3 and S4 across the entire the range of measurement. For the
calibration procedure, see paragraph 3.5.
Par. Description Def Min Max UOM
/P Type of probe
0 = NTC Standard Range -50T90°C
1 = NTC Enhanced Range -40T150°C
2 = PTC Standard Range -50T150°C
002-
/c1 Probe 1 calibration 0 -20 20 -
/c2 Probe 2 calibration 0 -20 20 -
/c3 Probe 3 calibration 0 -20 20 -
/c4 Probe 4 calibration 0 -20 20 -
Tab. 5.a
A
T1
T2
min max
Fig. 5.a
Key
T1 Temperature read by the probe
T2 Value calibrated by T1
A Calibration value
min, max Range of measurement
Note: the controllers that use PTC probes may have di erent part
numbers from those that only use NTC probes.
Example:
Model P/N Probes available
ir33+ IREV*7******* NTC/PTC
ir33+ wide PBEV*6******* PTC
easy wide
Tab. 5.b
Assigning the functions of probes S2, S3, S4
The controller, inside the refrigerated cabinet or cold room, can use the
following probes:
• defrost, located on the evaporator, preferably where ice remains the
longest;
• condenser, used to protect the compressor against high pressure
when the condenser is o or the condenser fan is malfunctioning;
• frost protection, to activate the corresponding alarm.
Note:
• to con gure probes 3 and 4 as digital input 1 and 2 respectively, set
parameters /A3 e /A4 =0;
• if multiple probes have been con gured with the same operating
mode, the controller will use the rst probe in increasing order with
that con guration.
Par. Description Def Min Max UOM
/A2 Probe 2 con guration (S2) (M models) 0 0 4 -
/A2 Probe 2 con guration (S2)
0 Absent
1 Product (display only)
2 Defrost
3 Condenser
4 Frost
204-
/A3 Probe 3 con guration (S3)
0 Digital input 1 (DI1)
1 Product (display only)
2 Defrost
3 Condenser
4 Frost
003-
/A4 Probe 4 con guration (S4/ DI2)
0 Digital input 2 (DI2)
1 Product (display only)
2 Defrost
3 Condenser
4 Frost
004-
Tab. 5.c
5.2 Digital inputs
Digital inputs DI1 and DI2 respectively can be enabled in the place of
probes S3 and S4. Digital inputs 1, 2 must rst be enabled (par. /A3 and /
A4 = 0) and then assigned to a speci c function (par. A4 and A5). Finally,
an external contact can be connected to the multifunction input to
activate various types of functions, such as alarms, curtain/door switches,
start defrost, etc. See the table below.
Important: to ensure unit safety in the event of serious alarms, the
unit must be tted with all the electromechanical safety devices needed
to guarantee correct operation..
Note: (applies to all settings of par. A4 and A5): if 2 digital inputs are
con gured in the same way, for example to enable defrost, the disable
event is generated when at least one of the inputs is open, while the
enable event is generated when at both inputs are closed.
Digital input functions
PARAMETERS A4, A5
Setting Contact
OPEN CLOSED
0 = not active - -
1 = immediate external alarm active not active
2 = delayed external alarm active not active
3 = select probe (ir33M) see /tI rst probe
enabled (/A2,
/A3, /A4, /A5)
3 = enable defrost (all other models) not enabled enabled
4 = start defrost not active active
5 = door switch with compressor and evapo-
rator fans o
door open door closed
6 = remote ON/OFF OFF ON
7 = curtain switch curtain open curtain closed
8 = low pressure switch low pressure
status
normal status
9 = door switch with fans o door open door closed
10 = direct/reverse operation direct mode reverse mode
11 = light sensor light o light on
12 = activate aux output deactivated activated
13 = door switch with compressor and fans
o and light not managed
door open door closed
14 = door switch with fans o and light not
managed
door open door closed
Tab. 5.d
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