Programming Heat SET and Absolute Alarm SET:
SET
Press 2 sec.
H.SEt
Lo.L .. UP.L
o
C
SET
A.SEt
SET
Prog. end
Heat SET;
(Process SET) value is
set Lo.L .. UP.L
Displayed if Ab.AL = Yes;
Absolute Alarm SET Value
is set Lo.L .. UP.L
Upper Display
AL.tY=
rel, -rel
bnd, -bnd
bn.i, -bn.i
Lo.L .. UP.L
o
C
ALARM Output
ALARM
AL.tY= -Abs. -rel
ON
X
PV
(X+A.hys)
ALARM
AL.tY= -Abs. rel
ON
X
PV
(X-A.hys)
AL.tY = Abs, -Abs; X = A.SEt
AL.tY = rel, -rel ; X = H.SEt + r.Alr
ALARM
AL.tY = bnd, bn.i (*)
ON
H.SEt
PV
ON
A
B
C
D
ALARM
AL.tY = bnd, bnd (**)
H.SEt
PV
ON
A
B
C
D
A = H.SET-b.Alr, B = H.SET-b.Alr+A.hys, C = H.SET+b.Alr-A.hYS, D = H.SET+b.Alr
(*) AL.tY = bn.i is same as bnd except that if AL.tY = bn.i, ALARM is never ON before PV is in band.
(**) AL.tY = -bn.i is always same as -bnd.
OUT Output (ON-OFF Control):
• ON-OFF is active when
“H.Hys” is other then 0.
ALARM
Cooling
OUT
PV
Heating
H.SET
(H.SET+C.Hys)
(H.SET-H.Hys)
H.SET
4
P, PI, PD, PID is active when “H.Hys” iss et 0 (only for heating; h-C is set to “HEAt”).
o
PbC:
Proportional band in C.
Ct:
Control period for PID control. Prefer 4-10 sec.
Ti:
Integral time; Set in minutes. Determines how fast controller reacts to compansate the offset between SET point and
the process value. If set to 0, integral part is OFF. If set too low, process value may oscillate.
Td:
Derivative time; Set in minutes. If set to 0, derivative parf is OFF. Determines how sensitive the controller is to
changes of the offset between SET point and the process value. If set too high, process value may oscillate of overshoot.
PID Parameters:
