Omega C9000A SERIES, User Manual

Page: 72 / 92

66
2 When temperature stable at setpoint:
* Select cool strategy Function .19/
* Select cool prop band option value Option 7
from table nearest to Heat prop band Function .11
value (view Function .5)
* Select cool cycle time option value
nearest to Heat cycle time value (view Function .10
Function .4)
* Adjust SP2 overlap/deadband to 0° Function .2
(zero) (Factory set 5°)
3 Thermal conditions:
Run with
normal background/exothermic thermal
conditions, good results should be
achieved and provide the basis for fine
tuning.
4 Further adjustments:
Eg. water
cooling. Should oscillation occur try
(in order):
* Double cool prop band value and Function .11
double integral time value Function .8
* Halve cool cycle time Function .10
* Introduce cool overlap by setting Function .2
negative value in Function .2 start (negative)
with a small negative number
5 Non-linear cooling
For water cooling above 100°C where Function .10/
flash to steam requires a non-linear
Options 13-15
output. Select non-linear ranges in cool
cycle time.
6 Fine tuning
If overshoot (into cool) or undershoot
(into heat) occurs, slowly make the
following adjustments, observing the
Function .2
results: (negative)
* Increase cool overlap Function .27/
* Apply SP2 cool limit, progressively Option 1, 2..
Also if needed: SP1 heat limit Function .26/
Option 1,2...
STEP ACTION PARAMETER