F24 - Low temperature alarm:
It is the temperature below that which the instrument will visually display the low temperature alarm
[atlo]
as well as the audible alarm (Buzzer). The differential for switching off the alarm is fixed at
0.1°C / 1°F. This alarm considers the temperature shown on the display, thus being influenced by the
temperature indication that was locked during the defrost
[,f18]
. To disable this alarm, simply set this
function to the minimum value until
[,,no]
is displayed.
F25 - High temperature alarm :
It is the temperature above that which the instrument will visually display the high temperature alarm
[athi]
as well as the audible alarm (Buzzer). The differential for switching off the alarm is fixed at
0.1°C / 1°F. This alarm considers the temperature shown on the display, thus being influenced by the
temperature indication that was locked during the defrost
[,f18]
. To disable this alarm, simply set this
function to the maximum vale until
[,,no]
is displayed.
Note:
For safety, output OUT1 is switched off if the controller is configured for heating and a high
temperature alarm
[athi]
occurs, or if it is configured for cooling and a low temperature alarm
[atlo]
occurs, therefore, you must set the alarm limits above (if heating) or below (if cooling) the
desired temperature (setpoint of output OUT1).
F26
- Output Operating Mode OUT2:
Select the operating mode of the OUT2 output.
[,,,1]
- Extra alarm-absolute range
: It considers the values defined in
[,F24]
and
[,F25]
as
minimum and maximum values to trigger the alarm output.
[,,,2]
- Extra alarm-setpoint range:
It considers the active receipt setpoint
[Rc1,]
or
[Rc2,]
and the absolute values defined in
[,F24]
and
[,F25]
, that is, the positive value of these functions
as minimum and maximum values to trigger the alarm output.
For example:
Desired temperature
[SP,,]
: - 5ºC
Low temperature alarm
[,F24]
: 2ºC
High temperature alarm
[,F25]
: 2ºC
City Limits: (
[SP,,]
-
[,F24]
and
[SP,,]
+
[,F25]
).
The low temperature alarm will go off at -7°C (-5-2) and the high temperature alarm at -3°C (-5+2).
[,,,3]
- Electric defrost (using resistances):
Where only the OUT2 output is activated during the
defrost process.
[,,,4]
- Hot gas defrost
: Where the compressor outputs OUT1 and OUT2 are activated during the
defrost process.
[,,,5]
- Output OUT2 as NF
of output OUT1
: In this option, the OUT2 output is activated when the
OUT1 output is deactivated, regardless of the state (cooling / heating or defrost), except when the
sensor is in error
[,F20]
.
[,,,6]
- OUT2 output as ventilation
: In this mode, the output will be used to activate a fan that will
remain on during the defrost interval. While the controller is cooling, the output will remain in operation
according to the configuration selected in function
[,F27]
- Fan Operation Mode during cooling.
[,,,7]
- OUT2 output as an auxiliary compressor
: The output will be used to start a seconds
compressor. Output OUT2 will be activated immediately after output OUT1 is activated, according to the
value configured in function
[,F31]
- Delay between the activation of compressors, and always
switched off together with output OUT1.
Note 1:
If the OUT2 output is configured to work different than an alarm, the absolute alarm indications
are still visual (messages on the display) and audible (if the buzzer is enabled)
Note 2:
If the OUT2 output is configured for defrost (electric or hot gas), after the defrost time has
elapsed, a fixed time of 2 minutes is counted for drainage. This time is necessary for dripping, that is, for
the last drops of water to drain from the evaporator. During this period, outputs OUT1 and OUT2 remain
off.
Note 3:
If output OUT2 is configured for ventilation, and if a sensor error occurs, output OUT2 will be
activated and deactivated together with output OUT1, that is, if OUT1 is activated OUT2 remains
activated, and will continue to work together according to the configuration selected in function
[,F20]
- Compressor status with the sensor disconnected.
F27 - Fan operation mode during cooling:
Selects the operating mode of the OUT2 output when
[,F26]
= 6.
[,,,0]
- OUT2 output remains activated as long as OUT1 output (compressor) is activated. When the
compressor is off by setpoint, the OUT2 output will be cyclically activated according to the values
configured in the functions
[,F28]
- Fan Time On and
[,F29]
- Fan Time Off;
[,,,1]
- Output OUT2 will remain on regardless of output OUT1;
[,,,2]
- OUT2 output will remain on as long as OUT1 output is on and off when OUT1 output is turned
off.
F28 - Fan On Time:
F29 - Fan Off Time:
Define fan on time
[,F28]
and fan off time
[,F29]
when the controller is in refrigeration mode
(
[,F04]
= 0) with output OUT1 turned off by temperature (setpoint) and OUT2 configured for fan
control (
[,F26]
= 6) and operating in cyclic mode (
[,F27]
= 0)
F30 - Fan Delay:
Defines the time (delay) before activating the OUT2 output (if configured as fan
[,F26]
= 6) after the
start of a new refrigeration cycle.
F31 - Delay between compressors being turned on:
Defines the time (delay) before activating the OUT2 output (if configured as auxiliary compressor
[,F26]
= 7). Every time the OUT1 output is activated, the time configured in this function will elapse
before activating the OUT2 output.
F32 - Alarm inhibition time when energizing the controller:
This is the time during which the alarm remains off even under conditions of alarm during the instrument
start-up. This time will be counted after elapsing of the time configured in
[,F19]
. This function can be
switched off by setting it at the minimum value 0
[no,,]
.
F33 -Alarm inhibition time by temperature:
With this configuration active, the temperature will need to remain in the alarm condition during the
inhibition time set, for the alarm to be indicated. That way one can prevent alerts resulting from specific
temperature variations, and after defrost.
F34 - Enable buzzer (0-Disabled/1-Enabled):
Allows enabling and disabling of the internal buzzer for alarm signaling.
F35 - Digital input operation mode:
Select the operatiing mode of the digital input.
[no,,]
- Disabled
[,,,1]
- Digital input: Door open (active when closing contact)
[,,,2]
- Digital input: Door open (active when opening contact)
[,,,3]
- Digital input: External alarm / power failure (active when closing contact)
[,,,4]
- Digital input: External alarm / power failure (active when opening contact)
[,,,5]
- Digital input: Door open and power failure (active when closing contact)
[,,,6]
- Digital input: Door open and power failure (active when opening contact)
[,,,7]
- Digital input: Push-button type switch (button) to manually start/stop defrost
[,,,8]
- Digital input: Push-button type switch (button) to switch the control functions off or on
F36 - Output on time in OUT2 alarm status:
F37 - Output off time in OUT2 alarm status:
Selects the cycling time in seconds of the alarm output when it is active. If any of those functions are set
with a value of
[,,,0]
the output will be permanently active.
F38 - Open door time for alarm:
If the door remains open for a time equal to, or greater than, the one configured in this parameter, the
controller will set off a visual open door alarm
[AOPn]
and the audible alarm (Buzzer).
The alarms are suspended upon the door closing. The audible alarm may be inhibited through the
>
key (pressed for 2s). This function can be switched off by setting it at the minimum value 0
[no,,]
.
Note 1:
In order for the open door alarm to operate, the function “Digital input operating mode”
[,F35]
must be configured as open door contact.
The audible alarm is activated only if the buzzer is enabled in the function “Enable Buzzer (0-Disabled
/1-Enabled)”
[,F34]
.
Note 2:
If the function “Digital input operating mode”
[,F35]
is configured as open door contact, the
open door indication
[OPEn]
will be displayed every time the door is open, except for the cases of
alarm.
F39 - Operating mode of the digital filter:
[,,,0]
- The filter acts both on the rise as on the decrease temperature.
[,,,1]
- The filter acts only in the temperature rise ramp. When the temperature falls, your response
will be immediate.
F40 -Digital filter intensity applied to the sensor:
This filter has the purpose of simulating increase in thermal mass at the sensor thereby increasing its
response time (thermal inertia). The higher the value set in this function, the more time the sensor takes
to respond.
This function can be switched off by setting it at the minimum value 0
[no,,]
.
F35 =
[,,,3]
1
5 6
2 3 4
SENSOR
NC
NC
Vca
A1
A2
F35 =
[,,,4]
1
5 6
2 3 4
SENSOR
NO
NO
Vca
A1
A2
Examples of connection for detecting open door alarm:
This configuration may be used for the
MT-514
e
Faston
to detect whether the door has been left
open for a time above the value set up in “
[,F33]
- Time with open door to trigger alarm”. In this
configuration, the message
[AOPn]
is displayed when an open door alarm is detected. To that end, the
user may use the NO or NC pushbuttons (not supplied) connected to the digital input, as shown in
examples below:
F35 =
[,,,1]
1
5 6
2 3 4
SENSOR
NC
Door contact
F35 =
[,,,2]
1
5 6
2 3 4
SENSOR
NO
Door contact
Examples of connection for power outage detection:
This configuration may be used when
MT-514
e
Faston
is being energized by a 12/24 V DC
battery (common in vaccine refrigerators) and one wants to detect when a power outage occurred
(115/230 V AC). In this configuration, the message
[AVoL]
is displayed when alarm is detected for
power outage. To that end, the user may utilize a contactor or auxiliary contact (not supplied), where NC
(
[,F30]
=
[,,,3]
) or NO (
[,F30]
=
[,,,4]
) contacts are connected to the digital input and
contacts A1 and A2 (contactor coil) are connected to the power system, as shown in examples below:
Example of connections for detecting open door and power outage:
This configuration may be used to detect power outage alarm (115/230 V AC) and also to detect that the
door has been left open (either one event).
In those configurations, the messages
[AVoL]
and
[AOPn]
are displayed alternately when alarm
event is detected (power outage or open door alarm).
For this purpose, the user may use the pushbuttons (not supplied) and a contactor or auxiliary contact
(not supplied) connected in series or in parallel, as shown in examples below:
F35 =
[,,,6]
Serial connection
1
5 6
2 3 4
SENSOR
NO
NO
Vca
A1
A2
NO
Door contact
F35 =
[,,,5]
Parallel connection
1
5 6
2 3 4
SENSOR
NC
NC
Vca
A1
A2
NC
Door contact
