Carel Hecu CO2, Руководство пользователя

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41
ENG
Hecu
C O
2
+0300085EN rel. 2.2 - 07.05.2019
Probe reading correction
The values read by the probes can be corrected by adding or subtracting
an off set from the measurement, set by parameters /c1 to /c5.
Par. Description Def Min Max UOM
/c1 B1 off set 0 -20.0 20.0 °C/°F
/c2 B2 off set 0 -20.0 20.0 °C/°F
/c3 B3 off set 0 -20.0 20.0 °C/°F
/c4 B4 off set 0 -20.0 20.0 °C/°F/
rH%
/c5 B5 off set 0 -20.0 20.0 °C/°F/
rH%/
bar/
psi
The off set may be subject to HACCP requirements. In this case, the off set
should be calculated using a calibrated instrument. Changing these
parameters that aff ect the values measured and displayed may not be
permitted. If in doubt, check with the food safety manager or the site
manager.
T1
T2
min max
A
Fig. 7.k
Key
T1 Temperature read by the probe
T2 Temperature read by the probe after correction with the off set
A Off set value
min, max Field of measurement
HACCP - IMPORTANT
Modifying the parameters that aff ect temperature measurement and
display may not be allowed in certain applications or may require specifi c
authorisation due to HACCP system requirements. If in doubt, check with
the food safety manager or the site manager.
Digital inputs
Note: digital input 1 (DI1) is used for the door switch by default,
however this can be confi gured for DI2 and DI3
If the door switch is not used (for example, connected to DI1), it can be
disabled by setting A3=1 and A11=5 (default value) or another function
can be associated with DI1, see Table 4b.
Par. Description Def Min Max UOM
A3 Disable door switch
0= enabled
1= disabled 1 0 1 -
If A3=0 and the door switch is not connected, the controller will activate
the "door open" icon. To prevent incorrect messages being displayed, set
A3=1 or short-circuit pin 21 (DI1) to one of the GND pins.
Multiple contacts can be connected to the multifunction digital inputs to
activate diff erent types of functions, such as alarm, start/stop defrost, low
pressure switch, etc.
Important: to guarantee the safety of the unit in the event of
serious alarms, all the electromechanical safety devices necessary
to ensure correct operation must be provided on the unit itself.
Function of digital inputs DI1, DI2 and DI3
PARAMETERS A11, A5, A9
Selection Contacts
OPEN CLOSED
0 = Not active - -
1 = immediate external alarm active not active
2 = Do not select - -
3 = enable defrost not enabled enabled
4 = start defrost not active active
5 =
Door switch active not active
6 = Remote ON/OFF OFF ON
7 = Change set point (r4-r5) from
switch not active active
8 = low pressure switch low pressure status normal status
9 = Do not select - -
10 = Do not select - -
11 = Do not select - -
12 = AUX output activation deactivated activated
13 = Do not select - -
14 = continuous cycle activation Open contact (deac-
tivation)
Closed contact
(activation)
15 = alarm from generic function
(DI2 and DI3 only) active/not active active/not active
16 = start/stop defrost stop start
17 = serious alarm active not active
Tab. 7.m
The parameter settings for A5 and A9 are described below.
1 = Immediate external alarm
Application: external alarm that requires immediate activation (for
example, high pressure alarm or compressor thermal overload).
Activation of the alarm:
1.
•
shows the message on the display ('IA');
•
activates the buzzer, if enabled;
•
activates the alarm relay, if selected;
2. involves the following actions on the actuators:
•
fans: continue to operate according to the fan parameters ("F").
Note : if more than one input is confi gured as an immediate alarm,
the alarm is generated when one of the inputs opens.
2 = Do not select
3 = Enable defrost
Application: any defrost request received when the contact is open will
remain pending until the contact closes.
A11/A5/A9 = 3
Contact Defrost
Open Not enabled
Closed Enabled (defrost start is still determined by the controller)
Closed with active
defrost When the digital input is opened, the defrost is immediately
stopped and the unit restarts normal operation (without
performing the dripping or post-dripping phases). The LED
starts fl ashing to indicate that the defrost request is pending,
waiting for the next enabling signal (closing of the contact),
when the defrost will be performed completely.
Tab. 7.n
Note: this function may be useful to prevent defrosts on units
exposed to the public during store opening hours.
4 = Start defrost from external contact
Application: this function is useful for carrying out synchronised defrosts
on several units, or manual defrosts controlled by an external contact. To
do this, simply connect a mechanical or electronic timer to the selected
digital input. Several units can be connected to the same timer, setting
diff erent values for parameter d5 (defrost delay from multifunction input)
to avoid simultaneous defrosts.