West Control Solutions KS 92-1 Programmer manual - Manual (Page 15)

Self-tuning heating ( ADA.H) and cooling ( ADA.C) error status:
3.5 Self-tuning
For determination of optimum process parameters, self-tuning is possible.
After starting by the operator, the controller makes an adaptation attempt,
whereby the process characteristics are used to calculate the parameters for fast
line-out to the set-point without overshoot.
The following parameters are optimized when self-tuning:
Parameter set 1:
Pb1 - Proportional band 1 (heating) in engineering units [e.g. °C]
ti1 - Integral time 1 (heating) in [s]r only, unless set to OFF
td1 - Derivative time 1 (heating) in [s]r only, unless set to OFF
t1 - Minimum cycle time 1 (heating) in [s]r only, unless Adt0 was
set to “no self-tuning” during configuration by means of
BlueControl
®
.
Pb2 - Proportional band 2 (cooling) in engineering units [e.g. °C]
ti2 - Integral time 2 (cooling) in [s]r only, unless set to OFF
td2 - Derivative time 2 (cooling) in [s]r only, unless set to OFF
t2 - Minimum cycle time 2 (cooling) in [s] r only, unless Adt0 was
set
to “no self-tuning” during configuration by means of
BlueControl
®
.
Parameter set 2: analogous to parameter set 1 (see page )
Operation
KS 90-1
p / KS 92-1 p 15 Self-tuning
Error
status
Description Behaviour
0 No error
3 Faulty control ac-
tion
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 excee-
ded set-point (pa-
rameter
determined)
If necessary, increase (inverse) or reduce (direct) set-point
7 Output step chan-
ge 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
Acknowledgment of this error message leads to switch-over to auto-
matic mode.If self-tuning shall be continued,
increase set-point (invers), reduce set-point (direct)
or decrease set-point range
(r PArA / SEtp / SP.LO and SP.Hi )
9 Impulse tuning fai-
led
The control loop is perhaps not closed: check sensor, connections
and process