52
FMS Commissioning
O regulation
2
Regulation strategy
With pre-setting for load
O regulation by means of a comparison between target and actual values is
2
changes (standard regulator)
only performed if no output change (load change) takes place ("internal
load” static). After a preceding load change, an target/actual value
comparison is performed and an actuation step triggered only after expiry of
the set lag time (parameters 898 and 900).
If the O actual value corresponds to its target value, the current correction
2
value, referenced to the load vale and the load direction, is stored in a table.
The updated value is output at the next load change.
A pre-update is already carried out as from the 2nd target/actual value
comparison, after a load change. As soon as the actual value gets close to
the target value, the correction value is updated.
When the load changes, regulation is terminated immediately after
target/actual value comparison and the neutral value, or if relevant the
correction value obtained (updated) for this load point,
is output
D
pre-setting!
Regulation after a target/actual value comparison is only performed again if
the load is stationary and on expiry of the lag time.
In this type of regulation, the overshoot is automatically deactivated in the
VMS/FMS. The actuators' hysteresis is compensated for by the load
direction-dependent updating of the correction value.
Regulation strategy with pre-setting for load changes
1
Pre-ventilation/ignition
The correction is switched off; i.e. the neutral correction value is
output.
2
O regulation on standby
2
The "Correction value with deactivated regulator” specified in
parameter 901/902 is output.
3
Regulator takes over the neutral correction value,
or the updated correction value is output.
4
On expiry of the set lag time, the residual deviation between target
and actual value is corrected.
5
Load change
O regulation is suspended and pre-setting carried out - neutral
2
correction value, or the updated correction value is output.
6
Regulation is deactivated, e.g. by a fault
The correction value for deactivated regulator specified in
parameter 901/902, or the one specified in parameter 917/918 for
"Air shortage”, is output.
Min. air overshoot
Max. fuel
Max. air overshoot
Min. fuel
t
1000
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