West Control Solutions N8840 - Manual (Page 22)

3.5.5 Self-tuning cancellation
By the operator:
Self-tuning can always be cancelled by the operator. For this, press Ù and È
key simultaneously.With controller switch-over to manual mode after self-tuning
start, self-tuning is cancelled. When self-tuning is cancelled, the controller will
continue operating using the old parameter values.
By the controller:
If the Err LED starts blinking whilst self-tuning is running, successful self-tuning
is prevented due to the control conditions. In this case, self-tuning was cancelled
by the controller. The controller continues operating with the old parameters in
automatic mode. In manual mode it continues with the old controller output
value.
3.5.6 Acknowledgement procedures in case of unsuccessful self-tuning
1. Press keys Ù and È simultaneously:
The controller continues controlling using the old parameters in automatic
mode. The Err LED continues blinking, until the self-tuning error was
acknowledged in the error list.
2. Press key Ò (if configured):
The controller goes to manual mode. The Err LED continues blinking,
until the self-tuning error was acknowleged in the error list.
3. Press key Ù :
Display of error list at extended operating level. After acknowledgement
of the error message, the controller continues control in automatic mode using
the old parameters.
Cancellation causes:
r page 15: "Error status self-tuning heating ( ADA.H) and cooling ( ADA.C)"
Operation
Self-tuning 22 8840 profiler