A d v a n c e d S e t t i n g s
Heat Cool Strategy Configuration (continued)
If no improvement, return to the original value and;
In level 1 halve the value of | CYC.2 |
If the process hunts between heating and cooling, a deadband setting may be needed. Enter a small value, eg. 1 and observe the process. Increase the setting until hunting stops.
Level 1 adjust value | SET.2 |
Water cooled applications
Water cooled applications operating at temperatures greater than 100°C may suffer from the non linear effect caused by water turning to steam. This can be countered by the non linear setting for SP2;
In level 2 set SP2.B to nL in
Multi zone applications
When tuning multi zone applications like extruders, distortions due to thermal interaction between adjacent zones can be minimised by running autotune on all controllers at the same time.
CALIBRATION TO ANOTHER INSTRUMENT
If the controller and instrument readings are different, the ZERO and/or SPAN function in Function Menu Level 3
will require adjustment.
ZERO
Adjust
to make an equal adjustment across the full scale
of the controller andSPAN to make a correction when the error increases/
decreases across the scale.
1 To adjust using the ZERO function
1.1 Substitute measured values in the expression:
Instrument reading – controller reading = | ZERO | ||
Example: |
|
|
|
Instrument reading | = 396° |
| |
Controller reading | = | 400° |
|
396 – 400 | = |
| |
1.2 Adjust ZERO to
24
