OSAKA
- OF 33 AZ - OPERATING INSTRUCTIONS - Vr. 01 - PAG. 6
If one wishes to set a defrosting cycle every time the instrument
is switched on (as long as the conditions set in the parameters
“tSdF” and "tEFE" apply) programme the parameter
“SdEF”
=
yES.
This allows the evaporator to be permanently defrosted, even
when frequent interruptions to power supply occur that may
cause the cancellation of the various defrosting cycles.
During the defrosting, it may occur that the temperature
measured by the cell probe (Pr1) increases excessively (this
obviously depends on the position of the probe Pr1 compared
to the evaporator).
In the event that one does not wish this increase to be
visualised by the instrument, it is possible to use the functions
in the parameter
“dLo”
(Block display during defrosting)
and
“Etdu”
(Differential unblocking of display after defrosting).
The parameter “dLo” = On allows the temperature Pr1
visualisation to be blocked on the last reading during a whole
defrosting cycle and until the temperature does not return
under the value [”SP” + “Etdu”] after defrosting has finished (or
the time set in the parameter "dALd" contained in the block
“
]
AL”).
With “dLo” = Lb, this allows visualisation of the writing
dEF
during defrosting and at the end of defrosting the writing
PdEF
up to when the temperature Pr1 does not return below the
value [”SP” + “Etdu”] (or the time set on the parameter "dALd"
contained in the block “
]
AL”).
Alternatively with the “dLo” = OFF, during defrosting, the
instrument will continue to visualise the temperature measured
by the probe Pr1.
Note that during defrosting, the temperature alarms are
disabled during the whole cycle and also afterwards for the
time set in the parameter
“dALd”
(see par. 4.9).
4.7 - MANUAL DEFROST
To start up a manual defrosting cycle, press the key
UP/DEFROST when it is not in programming mode and keep it
pressed for about 5 seconds after which, if the conditions are
correct, the led DEF will light up and the instrument will carry
out a defrosting cycle.
The start up or switch off commands of a defrosting cycle can
also be given by the digital input that are correctly programmed
(see par. 4.10).
4.8 - EVAPORATOR FANS CONTROL
All the parameters concerning fan control are contained in the
group
“
]
FAn”.
The control of the fans on the output configured as “FAn”
depending on determined control statuses of the instrument
and the temperature measured by the probe Pr2.
In the case that the probe Pr2 is not used (parameter “Pr 2” =
OFF) or in error (E2 o -E2) , the output FAN is activated only
depending on the parameters “FCOF” and “FEdF”.
The parameter
“FCOF”
decides whether the fans must always
be switched on independently of the compressor status
(“FCOF”=On) or be switched off together with the compressor
(“FCOF”=OFF).
The parameter
“FEdF
” instead decides whether the fans must
always be switched on independently of the defrosting status
(“FEdF”=On) or switched off during defrosting (“FEdF”=OFF).
In this latter case, it is possible to delay the start up of the fans
even after the end of the defrosting of the time set in the
parameter
“Fd”.
When the probe Pr2 is used (par. “Pr 2” = on) the fans, as well
as bei
ng conditioned by the parameters “FCOF” and “FEdF”,
are also conditioned by the temperature control.
It is possible to set the disablement of the fans when the
temperature measured by the probe Pr2 is higher than the one
set in the parameter
“FLt”
(temperature too hot) or when it is
lower than the one set in the parameter
“Fct”
(temperature too
cold).
The relative differential that can be set in parameter
“dF”
is
also associated with these parameters
.
d F
d F
t i m e
F A n
o f f
O N
F c t
P r 2
T e m p .
F L t
o f f
o f f
O N
4.9 - ALARM FUNCTIONS
All the parameters concerning the alarm functions are
contained in group
“
]
AL”.
The alarm functions of the instrument work on the internal
buzzer, if present and configured via the parameter “buF”, and
on the output desired, if configured by the parameters “O1F”,
“O2F” or “O3F”, depending on what is set on the said
parameters.
The possible selections of these parameters for the alarm
signalling function are:
= ALt
- when one wants the buzzer or output to be activated in
alarm and can be disabled (alarm silencing) manually by
pressing any key of the instrument (typical application for
sound signal).
= AL
- when one wants the buzzer or output to be activated in
alarm status but cannot be disabled manually and are therefore
only disabled when the alarm status ceases (typical application
for a light signal).
= ALL
- when one wants the buzzer or output to be activated in
alarm status and that they remain activated even when the
alarm has ceased (see par.4.9.4) Disablement (recognition of
memorised alarm) can only be carried out manually by pressing
any key when the alarm has ended (typical application for light
signal).
= -ALt
- when one wants the function described as ALt but with
an inverse function (buzzer or output activated in normal
condition and disabled in alarm status).
= -AL
- when one wants the function described as AL but with
inverse logic (buzzer or output activated in normal conditions
and disabled in alarm status).
= -ALL
- when one wants the function described as ALL but
with inverse working logic (buzzer or output activated in normal
conditions and disabled in alarm status).
When no alarms are present, the green LED OK is lit.
Any active alarm is shown on the instrument display with the
lighting up of the AL led and the switching off of the led OK.
Any silenced or memorised alarm status is shown by the AL
led flashing .
The alarm conditions of the instrument are:
-
Probe errors “E1”, “-E1”, “E2, “-E2”
-
temperature alarms “HI” and “LO”
-
External alarms “AL”
-
Open door alarm “AP”
4.9.1 - TEMPERATURE ALARMS
The temperature alarms work according to the probe Pr1
measurements, the type of alarm set in the parameter
“Aty”
the alarm thresholds set in parameters
“HAL”
(maximum
alarm) and
“LAL”
(minimum alarm) and the relative differential
“dAL”.
Through the parameter “Aty” it is possible to set the alarm
thresholds “HAL” and “LAL” which must be considered as
absolute (“Aty”=Ab) or relative to the active Set Point
(“Aty”=dE).
Using some parameters it is also possible to delay the
enablement and the intervention of these alarms.
These parameters are:
“PAL”
- is the temperature alarm exclusion time on switching
on the instrument if the instrument is in alarm status when it is
switched on.
