Electronic Control Unit - AFINOX AGX Bedienungs-, Installations- Und Wartungsanweisung

6.1.4. Electronic control unit

On the front panel of the instrument there is a three-digit display, and three LEDs back-lighting the buttons. These indicate:
this LED indicates the status (on or off) of the actuator controlled, (normally a
compressor); the button is back-lit by a green LED and is available only on the Top
models. The status of the LED can be the following, to indicate:
always on COMPRESSOR IN OPERATION
continuous flashing request pending for compressor activation
Alarm signal: present only on the Top models, the button is back-lit by a red LED.
Defrost in progress: present only on the Top models, the button is back-lit by a green LED. The status of the LED can be:
always on defrost in progress
continuous flashing request pending for defrost
THE LED DISPLAY SHOWS ONE OF THE FOLLOWING PIECES OF INFORMATION, ACCORDING TO THE FUNCTION IN
PROGRESS:
• in normal operation: value measured by the ambient probe or the second probe;
• when setting parameters: code of the parameter or the associated value;
• during an alarm event: flashing code of the alarm detected, alternating with the temperature value.
Using the keypad
Three buttons are used to perform the activation and deactivation of the instrument's operating states
and set the parameters.
The use of the buttons can be divided into two different situations: one in of normal operation, and the other to modify the
parameters. For each button, the following are the possible actions associated with both possibilities.
In modify parameter mode:
• moves from one parameter to the next;
• increases the value of the parameter.
In normal operation:
• silences the audible alarm (only if featured);
• displays and/or sets the Set Point;
• if pressed for more than 5 seconds not during an alarm: accesses the menu for setting type 'F' parameters
(frequent);
In modify parameter mode:
• displays the value of the selected parameter /exits the display;
• if pressed for more than 5 seconds in modify parameter mode, saves the changes.
In normal operation:
• if pressed for more than 5 seconds: starts a manual defrost, if enabled.
In modify parameter mode:
• moves from one parameter to the previous;
• decreases the value of the parameter.
Modifying the Set Point
The instrument has a Set Point of 4ºC. This can be modified as follows:
1. press the button for a second to display the value of the Set Point;
2. after an instant, the previously set value starts to flash;
3. increase or decrease the value of the Set Point using the
4. press again to confirm the new value.
Anomalous or special operating conditions
The instruments in the PJ32 series are able to automatically detect the main malfunctions with the consequent activation of the
following actions:
• the malfunction is signalled on the display with the corresponding alarm code. In particular, the instrument displays the
alarm code and the temperature read by the probe, alternating. In the case of more than one alarm, these are displayed in
sequence:
• the red LED on the button is ON
• for some alarms the internal buzzer, if present, sounds;
• for the same alarms the alarm relay, if present and configured as an alarm output, is activated.
Pressing the button silences the buzzer and de-energises the relay, while the alarm code and red LED go off only when the
cause of the alarm no longer exists. The alarm codes are shown in the following table:
alarm code buzzer and alarm relay
E0 active
E1 not active
IA active
L0 active
HI active
EE not active
Ed not active
dF not active
and/or
;
alarm description
probe control error
defrost probe error
external alarm immediate or delayed by A7
low temperature alarm
high temperature alarm
data error
end defrost for time-out
defrost in progress
buttons until the required value is displayed;
models on which present
12
all
all except S and X
all, if the digital input is present
all
all
all
all except PJ32S
all