Omega CN9000A Series User Manual page 72

STEP ACTION
2 When temperature stable at setpoint:
* Select cool strategy
* Select cool prop band option value
from table nearest to Heat prop band
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°
(zero) (Factory set 5°)
Thermal conditions: Run with
3
normal background/exothermic thermal
conditions, good results should be
achieved and provide the basis for fine
tuning.
Further adjustments: Eg. water
4
cooling. Should oscillation occur try
(in order):
* Double cool prop band value and
double integral time value
* Halve cool cycle time
* Introduce cool overlap by setting
negative value in Function .2 start
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
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
results:
* Increase cool overlap
* Apply SP2 cool limit, progressively
Also if needed: SP1 heat limit
66
PARAMETER
Function .19/
Option 7
Function .11
Function .2
Function .11
Function .8
Function .10
Function .2
(negative)
Options 13-15
Function .2
(negative)
Function .27/
Option 1, 2..
Function .26/
Option 1,2...