Omega CN4321, Manual, Page: 41 / 83

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SYSTEM MENU
P Proportional Band: The proportional band is that area
around main setpoint where the control output is neither
fully on nor fully off.
Setting range: 0.0 to 999.9% of full scale
For On/Off control, set to “0”
I Integral Time (reset): The Integral Time is the speed at
which a corrective increase or decrease in output is
made to compensate for offset which usually accompa-
nies proportional only processes. The more Integral Time
entered, the slower the action. The less Integral Time
entered, the faster the action. Enter a value that would
eliminate offset without overcompensation, that could
result in process oscillations.
Setting Range: 0 to 3200 secs
Integral action is turned off when set to “0”
d Derivative Time (Rate) : The Derivative Time is that time
used in calculating rate of change and thermal lag in
helping to eliminate overshoot that results in response to
process upsets. This overshoot usually accompanies
proportional-only and proportional-integral processes.
The derivative action dampens proportional and integral
action as it anticipates where the process should be.
The more Derivative Time entered, the more the damping
action. The less Derivative Time entered, the less the
damping action. Enter as much Derivative Time as nec-
essary to eliminate overshoot without over-damping the
process, that could result in process oscillations.
Setting Range: 0.0 to 999.9 secs
Derivative action is disabled when set to “0”