Owner's manual

Error-Status Selfoptimization
4.3.3
Acknowledgement procedures in case of unsuccessful self-tuning
1. Press keys Ù and È simultaneously:
The controller continues controlling using the old parameters
The Err LED continues blinking, until the self-tuning error was
acknowledged in the error list.
2. Press key Ù :
Display of error list at extended operating level. After acknowledgement
of the error message, the controller continues control using the old
parameters.
4.3.4 Examples for self-tuning attempts
4.3.5 (controller inverse, heating or heating/cooling)
Start: heating power switched on
Heating power Y is switched off (1).
When the change of process value X
was constant during one minute (2),
the power is switched on (3).
At the reversal point, the self-tuning at
-
tempt is finished and the new parameter
are used for controlling to set-point W.
Controller
Digital 280-1 Self-tuning 19
t
2
100%
Y
0%
X
W
start r
1
3
t turning point
blinks
lit off
Error status Description Behaviour
0 No error
3 Faulty control action Re-configure controller (inverse i direct)
4 No response of process variable The control loop is perhaps not closed: check
sensor, connections and process
5 Low reversal point Increase ( ADA.H) max. output limiting Y.Hi or
decrease ( ADA.C) min. output limiting Y.Lo
6 Danger of exceeded set-point
(parameter determined)
If necessary, increase (inverse) or reduce (direct)
set-point
7 Output step change too small
(dy > 5%)
Increase ( ADA.H) max. output limiting Y.Hi or
reduce ( ADA.C) min. output limiting Y.Lo
8 Set-point reserve too small Increase set-point (inverse), reduce set-point
(direct) or increase set-point range(r PArA / SEtp
/ SP.LO and SP.Hi )