128
Technical Handbook
1800
Hz
.
Band H:
Over speed
xxx
Hz
.
The only managed hysteresis band is the one used to diagnose the stopped or running engine
status. The generator detects no difference between the “G” and “H” bands.
Many parameters influence generator voltage measures:
•
P.9641: Nominal voltage (DC). It is used also for the auxiliary source, for the plant
battery and for the loads. Thresholds are expressed as a percentage of it.
•
P.0202: hysteresis applied to all the thresholds related to generator voltage. It is a
percentage value of P.9641.
•
P.9651: threshold (percentage of P.9641) under which the engine is considered
stopped.
•
P.9652: threshold (percentage of P.9641) over which the engine is considered started.
•
P.0301: low generator voltage threshold (percentage of P.9641); under this value the
generator cannot be connected to the loads.
•
P.0303: high generator voltage threshold (percentage of P.9641); over this value the
generator cannot be connected to the loads.
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
P.9651
Threshold for engine stopped
(Vdc).
17.5 %
8.4
P.9652
Threshold for engine started
(Vdc).
20.0 %
9.6
P.0301
Minimum voltage threshold.
75.0 %
36
P.0303
Maximum voltage threshold.
135.0 %
64.8
P.0202
Hysteresis
for
generator's
measures.
2.5 %
1.2
The hysteresis fully configured in the direction for the threshold entry, applies to the two
configurable thresholds (P.0301 e P.0303). This means that generator voltage is out of the
tolerance if out of the thresholds P.0301 and P.0303; it is in tolerance if between P.0301 +
hysteresis and P.0303
– hysteresis; otherwise, the previous status is maintained.
Keeping in account these values, the following bands are defined:
0
V
.
A band:
Absent
8.4
V
.
B band: Hysteresis
9.6
V
.
C band:
Low
36
V
.
D band: Hysteresis
37.2 (36+1.2)
V
.
E band:
In tolerance
63.6 (64.8-1.2)
V
.
F band: Hysteresis
64.8
V
.
G band:
High
xxx
V
.
Содержание HS 315
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