Sices HS 315, Техническое руководство

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124 Technical Handbook
It is possible to connect AC voltages (single-phase or three-phases) and/or DC voltage. If both
DC and AC voltages are connected, DC voltage has higher priority; when it cannot be used
(see in the following), the controller will use AC voltages.
The current is always measured as DC.
The connect
ion point of the voltages (both AC and DC) must be “before” the GCB circuit
breaker (if present).
The controller acquires the voltages and the current of the generator for:
•
Showing them on the display.
•
To protect the plant battery and the loads from high/low voltages on the generator.
•
To protect the generator itself from voltages/current out of thresholds.
•
Eventually to calculate the current on the loads (if not directly measured).
•
To match the voltage of the generator to the common bar voltage before closing the
GCB (voltage matching).
•
To regulate the generator current to zero during the cooling down cycle when GCB
cannot / must not be opened.
The generator must be connected to the JG connector. On a three-phase system, ensure to
connect the three phases (and optionally the neutral); on a single-phase system, ensure to
connect the L phase on terminal 3 and the neutral on terminal 4.
See paragraph 0 for the connections and for the configuration of the JG terminals.
Several parameters are related to frequency measure:
•
P.0105: nominal frequency. It is used for both generator and auxiliary source. All
frequency measure related thresholds are expressed as percentage of it.
•
P.0228: threshold (percentage of P.0105) under which the engine is considered
stopped.
•
P.0229: threshold (percentage of P.0105) above which the generator is considered
started.
•
P.0305: low voltage threshold (percentage related to P.0105) below this value the
generator cannot be connected to the loads.
•
P.0307: high frequency threshold (percentage related to P.0105) above this value the
generator cannot be connected to the loads.
•
P.0395: low frequency threshold (percentage of P.0105) (under this threshold, the
controller activates a warning).
•
P.0397: high frequency threshold (percentage of P.0105) (over this threshold, the
controller activates a warning).
•
P.0331: maximum frequency threshold (percentage of P.0105); over this threshold,
the engine must be stopped due to risk of damage to both the engine and the
alternator.
Here follows an example about the various threshold used, including default values for a.m.
parameters.