49
6
Commissioning
Parameter 896 can be used to select whether the pre-setting is always (at each firing rate
change) to be activated (factory setting Standard 1), or not activated (content 2).
Furthermore, the updating too can be turned off. It is then possible to select whether, at firing
rate changes, the neutral correction value or the ’Base value without controller’ is to be output
(parameter 896). The overshoot becomes active again when updating is turned off.
6.6.2.2 Extended Control Strategy (Air Shortage)
Regardless of the selected control strategy and the lag time set (parameter 898/900), imme-
diate and extensive action is taken by the controller to combat any air shortage occurring. The
objective is to avoid air shortage and to correct any such shortage as quickly as possible.
Controller overshooting and the resulting excess air are accepted as unavoidable.
Summary of Contents for VMS 4
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