1.7RaPID CONTROL FEATURE

The RaPID control feature may be used when extra fast responses and minimum overshoot are required. The RaPID feature works best when PID terms are well-tuned; therefore, it is recommended that the Pre-Tune feature (see Subsection 1.8) is run before the RaPID feature is engaged.

Press simultaneously twice

in quick succession

To disengage RaPID control, use the same key actions. NOTE: The RaPID feature cannot be engaged if Proportional Band 1 or Proportional Band 2 is set to 0. For a more detailed description of the RaPID feature, refer to Appendix C.

1.8PRE-TUNE FEATURE

This facility may be used to provide initial tuning of the Profile Controller’s PID parameters. Pre-Tune may be engaged (and subsequently disengaged) as follows:

NOTE: The Pre-Tune facility will not engage if (a) a program is currently running, (b) the process variable is within 5% of input span of the setpoint, or (c) an erroneous key sequence is used. Pre-Tune is a single-shot process which automatically disengages itself when completed.

To engage:

With Profile Controlle r showing a norm a l Op e ra tor Mod e d isp la y:

Upper display

Flashes

Upper display

once

flashes

stops flashing

 

HO LD KEYS

 

 

DO WN U N TIL

 

 

Three seconds approx.

 

To dis-engage:

With Profile Controlle r showing a norm a l Op e ra tor Mod e d isp la y:

Upper display

Flashes

Upper display

once

flashes

stops flashing

 

HO LD KEYS

 

 

DO WN U N TIL

 

 

Three seconds approx.

 

Flashes

whilst Pre-Tune

is engaged

Goes OFF

1-4

Volume II

O077-1

Page 32
Image 32
Omega CN1166 manual RaPID Control Feature, PRE-TUNE Feature