User Manual

81
Overlap/Deadband Type: Controller Parameter
Defines the portion of the primary and secondary proportional bands (Pb_P + Pb_S) over which
both outputs are active (Overlap), or neither is active (Deadband). It is adjustable in the range -20%
to +20% of the two proportional bands added together. Positive values = Overlap, negative values =
Deadband.
This parameter is not applicable if the primary output is set for On-Off control or there is no
Secondary Output. If the Secondary Output is set for On-Off, this parameter has the effect of moving
the Differential band of the Secondary Output to create the overlap or deadband. When
Overlap/Deadband = 0, the “OFF” edge of the Secondary Output Differential band coincides with the
point at which the Primary Output = 0%. ).
Display code = ΟΛ
ΟΛΟΛ
ΟΛ, default value = 0%.
Also refer to Differential , On-Off Control , Primary Proportional Band and Secondary Proportional
Band .
Figure 37. Overlap/Deadband
Overlap/Deadban
Output 1
Output 1
Output 2
Output 2
Output 2
Process Variable
Process Variable
Process Variable
Proportional Band 1
Pr
oportional
Band 1
Proportional
Band 1
Proportional Band 2
Proportional
Band 2
Proportional Band 2 = 0
Output 1
Output 1
Output 1
Output 1
Output 2
Output 2
Output 2
Overlap
(positive value)
Deadband
(negative value)
Negative values
Positive values
OVERLAP WITH
PID
DEADBAND WITH
PID
OVERLAP &
DEADBAND WITH
ON/OFF
Output Power (%) Output Power (%) Output Power (%)
Output 2 ON
Output 2 OFF
ON/OFF Differential