14 pmg511en21p01
5.5.3 Deadband/Overlap Band
[PAR2 → DB]
It is possible to assign a deadband between the heating and cooling control bands based on the Set Value
(SV)
for
heating and cooling. A deadband is formed around the
SV
when a positive
(+)
value is set. There is no regulation in
the deadband, so the heating and cooling
MV (Manipulated Variable)
will be 0.0% in the deadband formed. When
the negative
(-)
value is set, an overlap band
(simultaneous heating and cooling MVs)
is formed around the SV.
Set to 0 if no deadband or overlap band is used.
When setting the integral time, this applies if the integral time for the heating control and cooling control is set.
It also acts as a P-P controller for PI-P control and P-PI control.
Ranges and default settings:
[OUT1 / OUT2]: PID / PID, PID / ON-OFF, and ON-OFF / PID control
–
Set the range
(temperature)
: –
(proportional band)
+
(proportional band)
(lower value when using different proportional bands)
–
Set the range
(analog)
: –99.9…+99.9
– Default:
0000
(temperature H)
,
000.0
(temperature L, analog)
,
(unit: temperature °C / °F, analog % F.S.)
[OUT1 / OUT2]: ON-OFF / ON-OFF control
–
Set the range
(temperature):
–999
(overlapping band)
–0000
(not used)
–
+999
(deadband) (temperature H)
–199.9
(overlapping band)
–000.0
(not used)
–
+999.9
(deadband) (temperature L)
–
Set the range (analog):
–99.9
(overlap band)
000.0
(not used)
–099.9
(deadband)
–
Default:
0000
(temperature H),
000.0
(temperature L, analog),
(unit: temperature °C / °F, analog % F.S.)
Using the deadband:
When db is in 10 digits
When db is in 10 digits
Heating
MV
SV-5
SV-5
Process value
ON
SV+5
Deadband
Deadband
Cooling
MV
Heating control
Heating control
Cooling control
Heating control
Control output
MV
Control output
MV
PID heating control and PID cooling control
Heating proportional band
Heating proportional band
Cooling hysteresis/offset
100.0%
100.0%
Cooling proportional band
% FS analog
PID heating control and ON/OFF cooling control