Carel PJ32S - PJ32 User Interface, LEDs, and Keypad Operation

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Fig. 2.3.1 shows the front panel of the plug-in: display and buttons. On the front
panel of the instrument there is a three-digit display (ref. 4 in the figure 2.3.1), and
three LEDs back-lighting the buttons (refs. 1, 2 and 3 in Fig. 2.3.1).
These indicate:
  this LED indicates the VWDWXV RQ RU RII of the actuator controlled, (normally a
compressor); the button is back-lit by a green LED and is available only on the 7RS models.
The status of the LED can be the following, to indicate:
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request pending for compressor activation
IODVKLQJZLWKF\FOHVDQGDSDXVH
continuous cycle on
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ó  $ODUPVLJQDO present only on the 7RS models, the button is back-lit by a red LED.
ì  'HIURVWLQSURJUHVV present only on the 7RS models, the button is back-lit by a green LED. The status of the LED can be:
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defrost in progress
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request pending for defrost
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• 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.
The temperature measured by the probe is displayed with resolution to a degree (ºC or ºF).
The display range for the temperature is: -50 ÷ 90 ºC (or -50 ÷ 127 ºF).
For the parameters, the values can vary from -99 to +199 and in some cases from -127 to +127. The unused segments of the left-
most digit are normally always off; expansion modules (Serial 485 and HACCP) can be used to signal states or parameter
programming modes. For a complete description please refer to the expansion module manual.
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Three buttons (5, 6 and 7 in Fig.2.3.1) 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.
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In QRUPDORSHUDWLRQ and if pressed for more than 5 seconds:
• activates/deactivates continuous cycle (compressor).
In PRGLI\SDUDPHWHU mode:
• moves from one parameter to the next;
• increases the value of the parameter.
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• silences the audible alarm (only if featured);
• displays and/or sets the 6HW3RLQW ;
• if pressed for more than 5 seconds not during an alarm: accesses the menu for setting type ‘F’ parameters
(frequent);
• if pressed when turning on the instrument, together with the button, activates the parameter RESET
procedure.
In PRGLI\SDUDPHWHU 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.
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In QRUPDORSHUDWLRQ :
• if pressed for more than 5 seconds: starts a manual defrost, if enabled.
In PRGLI\SDUDPHWHU mode:
• moves from one parameter to the previous;
• decreases the value of the parameter.
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