Emerson Process Management ControlWave EFM 3808 - Manual (Page 213)

CI-ControlWave EFM Appendix F / F- 13
property damage, and injury to persons. When setting the WebBSI Web Page
parameters, make sure the associated process is observed and protected.
Figure F-9 - Flow Control & Valve Control Web Page
Setpoint (x1000)
This field contains the operating point at which the flow rate is to be controlled. Set-point
units are MSCFH with a default setting of 1000 MSCF per Hour. To change the Setpoint
value, right click on the field and select Change Signal Value.
Gain
Gain controls the amount of output change resulting from a change of the measured
variable. The default value of 1.00 is typically used as a starting point; final gain is usually
less. To change the Gain value, right click on the field and select Change Signal Value.
Integral
Integral determines the time it will take the PID to correct an error in the measured
variable. The number of times the output is adjusted in a given time period is specified in
seconds. An entry of 60 seconds can be used as a starting point; this would provide one (1)
repeat per minute. To change the Integral value, right click on the field and select Change
Signal Value.
Derivative
Derivative compensates for a rapidly changing measured variable. The time is specified in
seconds (SECS) and most applications will use a setting of zero (0). To change the
Derivative value, right click on the field and select Change Signal Value.
Deadband
Deadband provides a means of specifying a 'window' in which the variable does not affect
the output. This entry is in percent (%) of the SETPOINT signal. As an example, a 5% entry
would mean that the controller output must exceed the present setpoint by 5% before the
output is changed. To change the Deadband value, right click on the field and select Change
Signal Value.