Marathon Computer AACC 2000 Manuale Utente

AACC 2000 Carbon                                                                       Nov.  1, 1997

26

 Basic operation

 

Switch on the power to the controller.  It runs through a self-test sequence for about three
seconds and then shows the process value, in the upper readout and the setpoint, in the
lower readout.  This is called the Home display.

 

 

 

 
 

Process Value (PV)

 

Setpoint

 

 

 

 

 

 

 

You can adjust the setpoint by pressing the 

 or 

 buttons.  Two seconds after

releasing either button, the display blinks to show that the controller has accepted the
new value.

 
 

OP1 will light whenever output 1 is ON.   This is normally the heating output when used
as a temperature controller.

 

OP2 will light whenever output 2 is ON.   This is normally the cooling output when used
as a temperature controller.

 

Note: You can get back to this display at any time by pressing 

 and 

 together.

Alternatively, you will always be returned to this display if no button is pressed for 45
seconds, or whenever the power is turned on.

 

 

 

If the controller detects an alarm condition, it flashes an alarm message in the Home
display.  For a list of all the alarm messages, their meaning and what to do about them,
see Alarms at the end of this chapter.

 

26.0

20.0