SOXJLQ
Cod. +030221881 rel. 1.0 - 11/02/2000 23
$/PLQLPXPWHPSHUDWXUHDODUP
Selects the low temperature alarm. The value of
$/
does not indicate the alarm temperature but rather the
PD[LPXPGLIIHUHQFH
DOORZHGEHORZWKH6HW3RLQW
.
For
DOOPRGHOV
ORZWHPSHUDWXUHDODUP 6HW3RLQWYDOXHRI$/
Note that changing the Set Point automatically changes the low temperature alarm, in that maximum difference allowed remains the
same (=
$/
). The low temperature alarm has an automatic reset. This means that if the temperature returns above the threshold
value +
$
, the alarm signal automatically stops. Finally, please remember that the low temperature alarm is also used in the
continuous cycle (see corresponding section on page 59). In fact, if the temperature falls to the alarm level the continuous cycle is
automatically deactivated, even if the selected period has not elapsed. The deactivation does not give rise to an alarm signal.
Def.:
$/
=0 (low temperature alarm inhibited). Available on all models.
$+KLJKWHPSHUDWXUHDODUP
Selects the high temperature alarm. The value of
$+
not indicates the temperature of alarm but rather the
PD[LPXPGLIIHUHQFH
DOORZHGDERYHWKH6HW3RLQW
(working point).
Per
DOOPRGHOV
KLJKWHPSHUDWXUHDODUP 6HW3RLQWYDOXHRI$+
Note that changing the Set Point automatically changes the high temperature alarm, in that maximum difference allowed remains the
same (
$+
). The high temperature alarm also has an automatic reset. When the temperature falls below the threshold value –
$
the
alarm signal automatically stops.
Def.:
$+
=0 (high temperature alarm inhibited). Available on all models.
$GWHPSHUDWXUHDODUPGHOD\
Indicates after how many minutes the temperature alarm is signalled from when it is detected. If the temperature, after the delay
$G
, is back within the allowed limits, the alarm is not signalled.
Setting a delay to signal of the temperature alarms may help eliminate false alarms due to interference on the probe signal or
situations lasting a short time (for example, opening the cold room door briefly).
The temperature alarm delay has no effect on two special functions: defrost and continuous cycle. To delay any temperature alarms
DIWHU
these functions, parameter
G
for defrost and
F
for continuous cycle must be modified. Remember that during defrost and
continuous cycle no temperature alarms are generated.
Def.:
$G
=0 (instant temperature alarm). Available on all models.
$0XOWLIXQFWLRQGLJLWDOLQSXWFRQILJXUDWLRQ
The MULTIFUNCTION digital input can assume different meanings according to the value attributed to this parameter, and
according to the model of control used. Following is a description of the possible functions:
$
= 0:
LQSXWQRWDFWLYH
The Multifunction digital input is not used. This is the default value for all versions.
$
= 1:
H[WHUQDO
DODUP
An external alarm requiring immediate intervention can be connected to the digital input (for example, high pressure or compressor
thermal overload alarm). In particular, the alarm is detected when the contact opens (normal operation with contact closed). The
management of the alarm can be instant, or with a delay according to the value of parameter
$
(0 = instant).
The activation of the alarm brings a bout a message on the display (see alarm
,$
), activates the buzzer, if featured, and causes the
following actions on the actuators:
FRPSUHVVRU
causes the compressor to shut-down from external alarm (immediate if
$
=0 )
IDQV
causes operation according to the fan parameters (
)
). If the external alarm is detected during a defrost or a
continuous cycle, the control exits the procedure
When
WKHDODUPVWRSV
, the machine returns to operation as follows:
'()5267
defrosts can again be performed. The next starts after the set time
G,
(interval between defrosts)
FRPSUHVVRU
if at the instant the alarm ends the compressor is on, it stays on for the minimum set time (parameter
F
). If it is
off, it stays off for a minimum time equal to the minimum off time (parameter
F
)
The configuration with delay (
$
> 0) is especially useful for managing the low pressure alarm. It is frequent, in fact, for the unit
to detect a low pressure alarm when first turned on, due to the environmental conditions and not a unit malfunction. Setting an
alarm delay avoids false signals. In fact, by carefully calculating the delay, if low pressure is due to environment conditions (low
temperature) the alarm will automatically return before the set delay elapses. The effect on the compressor, fans, defrost and
continuous cycle are the same, after the set delay, as above.
:DUQLQJ
: as already indicated in the installation instructions, to ensure the safety of the unit in the event of serious alarms (for
example, the pressure alarms), the unit must be fitted with all the electromechanical devices required to guarantee correct
To Next Page
Loading...
