Pixsys ATR 401 - Page 24

24 ATR401 - User manual
Integral time and derivative time are the same for both actions.
Parameter  sets the percentage overlapping between the two actions.
For installations where heating and cooling output cannot be activated at the
same time, a dead band will be con gured ( ≤ 0),
vice versa an overlapping will be con gured ( > 0).
Figure here below shows an example of double action P.I.D. (heating-cooling)
with  = 0 and  = 0.
SPV
PV
ATTIVO
ACTIVE
ATTIVO
ACTIVE
   x      (COOL-FREDDO)
 < 0
   (HEAT-CALDO)
COMMAND OUTPUT (HEAT)
ALARM OUTPUT (COOL)
SPV
PV
ATTIVO
ACTIVE
ATTIVO
ACTIVE
   x      (COOL-FREDDO)
 = 0
   (HEAT-CALDO)
COMMAND OUTPUT (HEAT)
ALARM OUTPUT (COOL)
S
PV
PV
ATTIVO
ACTIVE
ATTIVO
ACTIVE
   x      (COOL-FREDDO)
 > 0
   (HEAT-CALDO)
COMMAND OUTPUT (HEAT)
ALARM OUTPUT (COOL)