Pixsys ATR 401 - Heating-Cooling P.I.D

ATR401 - User manual 23
Press Display Do
4
SET
Set virtual zero. Display shows
  NB: If “Virtual zero at
start”is selected, point 4 must
be repeated at each starting.
To exit procedure press
FNC
.
9.1 Heating-Cooling P.I.D.
ATR401 is suitable also for applications requiring a combined heating-cooling
P.I.D. action.
Command output must be con gured as Heating P.I.D.
(  =  and    greater than 0 and one of alarms
(, ,  or ) has to be con gured as 
Command output must be connected to actuator responsible for heating
action, while alarm will control the cooling action.
Parameters to con gure for Heating P.I.D. are:
 =  Command output action type (Heating);
   : Proportional band Heating;
 : Integral time Heating and cooling;
 : Derivative time Heating and cooling;
 : Cycle time Heating.
Con guration parameters for Cooling P.I.D. are (example: action associated
to alarm 1):
 =  Alarm 1 selection (Cooling);
     : Proportional band multiplier;
: Overlapping / Dead band;
: Cycle time Cooling.
Parameter      (that ranges from 1.00 to 5.00) sets the proportional band
for cooling action, according to the formula here below:
Proportional band cooling action =    x   
In this way it is possible to have a proportional band for cooling action that
will be equal to heating proportional band if      = 1.00, or 5 times greater
if     = 5.00.