-Din, 1 / 8 -Din; Overlap/Deadband - WEST P8700 User Manual

Overlap/Deadband

Defines the portion of the primary and secondary proportional bands ( -6B- + -6B: ) 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 = ,+ , default value = 0%.
Also refer to Differential, On-Off Control, Primary Proportional Band and Secondary
Proportional Band.
OVERLAP
WITH PID
DEADBAND
WITH PID
OVERLAP &
DEADBAND
WITH ON/OFF
Page 118
1 1 1
/ -DIN, / -DIN & /
4 8
Proportional Band 1
Proportional Band 2
Output 1
Output 2
Overlap
(positive value)
Proportional
Band 1
Output 1
Output 2
Deadband
(negative value)
Proportional
Band 1
Output 1
Output 2
ON/OFF Differential
Positive values Negative values
Overlap/Dead
Figure 43. Overlap and Deadband
Glossary
- DIN Controllers & Indicators - Product Manual
16
Output 2
Output 1
Process Variable
Proportional
Band 2
Output 2
Output 1
Process Variable
Proportional Band 2 = 0
Output 2
Output 1
Process Variable
Type: Controller Parameter
59305, Issue 5 – March 2005