3 Parameterization of HEINZMANN Speed Governors
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Programmer PG 02
3.5
Activation of Functions
With regard to the activation of functions, the following alternatives are provided:
permanently
active: These functions cannot be turned off (e.g., overspeed
monitoring).
parameters:
Parameters contained in list 3 enable functions that after being
selected by the user will remain permanently active (e.g., speed
dependend fuel limitation.
switching functions : By means of external switches the control can be instructed to
adopt certain requested operational states that are subject to
frequent changes during operation (e.g., change-over of droop or
limitation curves). The states of the external switches can be
viewed by the parameters that have been assigned the numbers
from 2800 on upward.
3.6
Parameterization of Characteristics
Parameterization of characteristics is done by one and the same procedure. The number of
pairs of variates, however, will be different for different functions. A pair of variates
consists of one x-value and one y-value both with the same index. Intermediary values
between adjacent pairs of variates will be interpolated by the control.
When parameterizing a characteristic, the following instructions must be observed:
The characteristics must always begin with the pair of values indexed 0.
The x-values must be sorted in ascending order.
Each x-value may occur only once.
For unused pairs at the end of the characteristic, the x-variate must be set to the
smallest possible value.
Parameterization of any characteristic does not require all pairs of variates to be assigned a
value. It will suffice to assign values only to as many parameters (beginning with index 0)
as will be needed. Similarly, it will not be necessary that the distances between the base
points (or nodes) be the same.
When the current x-value of any characteristic is below the first base point (supporting
point), the value of the characteristic will be set to the y-value of the first base point
(supporting point), and when it is beyond the last base point, the y-value of this base point
will be used. In other words, the first and last of the y-values will be retained in case the
current x-value is outside the characteristic's domain.
