Carel plug-in User Manual download pdf (Page 20)

plug-in

Cod. +030221881 rel. 1.3 - 03/05/2006

4. PARAMETERS - DESCRIPTION

4.1 The configuration parameters

The parameters can be classified in two groups for setting:

• frequent parameters (indicated by type F in the following tables);

• configuration parameters (type C), whose selection is ‘password’ protected to prevent unwanted tampering.

The assigning of the parameters to groups F and C can also be programmed, but only via serial access using the key or a

supervisory system.

Following is a description of each parameter, indicating the versions it is available in and the possible values.

Furthermore, the default value (def.) is listed, that is the value assigned to the parameter in the factory.

4.2 Classification of the parameters

The parameters, as well as being divided by type, are also grouped in logical categories identified by the fist letters of the

parameters themselves. Following is a list of the existing categories, with the meaning and identifying letters.

indicates the password, this must be entered to access the configuration parameters (C)

category description

temperature probe management parameters

temperature control parameters

compressor management parameters

defrost management parameters

alarm management parameters

evaporator fan management parameters

general configuration parameters

Tab. 4.2.1

4.3 The password PS

This is deliberately included to complicate access to type C parameters, so as to prevent accidental or unauthorised

modifications. Type C parameters are in fact those which modify the configuration of the control. Once entered into the

configuration parameters section using the password, the control also allows, for convenience, type F parameters to be

modified.

When displaying the type F parameters, type C parameters are accessed as follows:

1. select the password parameter PS;

2. enter and confirm the value 22, the correct password;

3. all the parameters, F and C, can now be selected on the display.

4.4 / = temperature probe management parameters

probe parameters type min max uom def

ambient probe calibration x10 (tenths of a degree) F -127 +127 °C/°F 0.0

measurement stability C 1 15 - 4

display control / food storage probe F 0 1 - 0

display in °C/°F (0=°C, 1=°F) C 0 1 flag 0

Tab. 4.4.1

/C: calibration or Offset

This parameter allows the temperature shown on the display to be corrected. The value assigned to this parameter is in fact

added to (positive value) or subtracted from (negative value) the temperature measured by the probe. For example, if the

temperature displayed needs to be decreased by 2.3 degrees, set /C=-23.

The Offset can range from -127 to +127, with a variation in the reading between -12.7 and +12.7 (°C/°F). The parameter does

not act on the defrost probe (in all the models with two probes). Def.: 0.0 (no Offset to probe reading).

Available on all models.

/2: measurement stability

Defines the coefficient used to establish the temperature measurement. Low values assigned to this parameter offer the prompt

response of the sensor to variations in temperature; the reading is however more sensitive to disturbance. High values slow

down the response but guarantee greater immunity to disturbance, that is a more stable and more precise reading. The setting is

also used also for the second probe, if present. Value from 1 to 15. Def.: 4.

Available on all models.

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