Technical Handbook 121
•
Connecting also the AC voltages.
If no one of the previous methods can be used, if the controller acquires the DC voltage, it is
used (even if it could not be the real voltage of the auxiliary source).
There are various parameters that influence its management:
•
P.9641: Nominal voltage (DC). It is used also for the generator, for the plant battery
and for the loads.
•
P.0201: hysteresis applied to all the thresholds related to auxiliary source voltage. It
is a percentage value related to P.9641.
•
P.0203: auxiliary source low voltage threshold (percentage related to P.0116) (below
which the auxiliary source is considered anomalous).
•
P.0204: auxiliary source high voltage threshold (percentage related to P.0116) (above
which the auxiliary source is considered anomalous).
To disable this check, one of the following conditions shall be true:
▪
P.0203 = 0 %.
▪
P.0204 = 200 %.
▪
P.0203 >= P.0204
Here follows an example about the various threshold used, including default values for a.m.
parameters.
Parameter
Description
Default value
Voltage (Vdc)
P.9641
Nominal voltage (DC).
48 Vdc
48
-
Auxiliary source presence
threshold
20.0 %
9.6
P.0203
Auxiliary source low voltage
threshold.
80.0 %
38.4
P.0204
Auxiliary source high voltage
threshold.
110.0 %
52.8
P.0201
Hysteresis
for
auxiliary
source measures.
2.5 %
1.2
The hysteresis on the various thresholds is calculated as half the difference between P.0204
and P.0203. However, it is limited by the maximum value set with parameter P.0201. The
hysteresis applies to:
▪
Downwards, to auxiliary source availability threshold (i.e., between 8.4 Vdc and 9.6
Vdc).
▪
Upwards, to the minimum voltage threshold (i.e., between 38.4 Vdc and 39.6 Vdc).
▪
Downwards to the maximum voltage threshold (i.e., between 51.6 Vdc and 52.8 Vdc).
These values define the following bands:
0
V
.
A band:
absent
8.4 (9.6-1.2)
V
.
B band: hysteresis
9.6
V
.
C band:
low
38.4
V
.
D band: hysteresis
39.6 (38.4+1.2)
V
.
E band:
in tolerance
51.6 (52.8-1.2)
V
.
F band: hysteresis
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