Technical Handbook 125
Parameter
Description
Default value
Frequency in Hz
P.0105
Nominal frequency.
50 Hz
50
P.0228
Threshold for engine stopped
(Hz).
10.0 %
5
P.0229
Threshold for engine started
(Hz).
20.0 %
10
P.0305
Minimum frequency threshold. 90.0 %
45
P.0307
Maximum
frequency
threshold.
110.0 %
55
P.0331
Maximum speed threshold
(frequency).
120.0 %
60
0
Hz
.
A band:
absent
5
Hz
.
B band:
hysteresis
10
Hz
.
C band:
minimum
45
Hz
.
D band:
low
46
Hz
.
E band:
in tolerance
54
Hz
.
F band:
high
55
Hz
.
G band:
Maximum
60
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; they are separated
only to implement an engine over speed protection in case its speed cannot be detected in
other ways (pick-
up, “W” signal, CAN-BUS, etc.).
Thresholds P.0305, P.0307 and P.0331 are used also to manage the generator protections on
frequency. These protections can be individually disabled setting to zero the relevant
parameter that specifies the delay (respectively P.0306, P.0308 and P.0332). Even if the
protections are disabled, thresholds are however used to define the frequency status: this
allows not to close the GCB circuit breaker if the electrical magnitudes are out of the tolerance
band.
Thresholds P.0395 and P.0397 are used for protections only; they are not used for detecting
the status of the generator.
Many parameters influence generator voltage measures:
•
P.0102: nominal voltage (AC) of the generator. Phase-to-phase rated voltage shall be
set for three-phases systems; single-phase, for single phase systems. Thresholds are
expressed as a percentage of it.
•
P.0103: rated voltage (in Volt) for the primary of the voltage transformers connected
to connector JG.
•
P.0104: rated voltage (in Volt) for the secondary of the voltage transformers connected
to connector JG.
•
P.0202: hysteresis applied to all the thresholds related to generator voltage. It is a
percentage value of P.0102.
Содержание HS 315
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