Carel srl: pCO Stage Controller
page 18
- 022 (Maintenance, Clock, Setpoint);
- 055 (Programming).
The selected value of the password is always reset when other parameters are visualized.
Main display: Menu
After pressing the Menu button the probe 1 reading is displayed on the left side of the display whereas on the right
side of the display the probe 2 reading is displayed. If one of two probes has not been selected (P1=0 and/or
P24=0), the following symbol “----” appears instead of the reading.
The LED located on the left of each display lights up near to the unit of measure (bar; ºC or ºF) used by the probe
selected. If at least one of the connected probes is a pressure one, by pressing the
menu
key the correspondent
temperature value (ºC or ºF according to the different value imposed to P39 parameter) is displayed. The conversion
table has been compiled according to the different types of Freon. The range used for the conversion between
pressure and temperature is -30÷50ºC.
Lamp-Test initial
Wherever the pCO is fed, the display switches on all its LEDs and the following figure “8.8.8. 8.8.8.” is displayed for
a few seconds. After the Lamp-Test the probe readings are displayed and only the LEDs needed for the functioning
are switched on. During this procedure it is possible to verify if all the LEDs are working.
Selection of the negative parameters
Many parameters that can be selected from the terminal can have negative values. When these parameters are
included between “-99” and “-10” it is not possible to select the decimal value. Therefore the whole value without
decimal is always accepted. From the supervisor, on the contrary it is also possible to select the decimal value.
For this reason when selecting from the supervisor negative parameters with values ranging -99 and -10 it is
necessary to select exclusively values with 0 as decimal part.
Installation of the Default Values
automatic installation:
in the software a control is implemented that carries out the automatic installation of the
default values when the initial program loading is done or when the EPROM is substituted
for another different version (verify the version and date reported on the EPROM label);
manual installation:
if the user wants to reprogram the machine
, he must put it into the OFF state
. Afterwards
he must
press simultaneously the MENU+PROG buttons
till “rST 0” appears, then press
or
button, the symbol “8.8.8. 8.8.8.” is displayed, all the LEDs stay alight for a few
seconds and in the meantime the software installs the default values.
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