Sices HS 315, Техническое руководство

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164 Technical Handbook
HS315 uses two controls to manage the fuel pump, that can be associated to any digital output
(P.3001 parameter and subsequent ones) with the functions:
•
DOF.1032
(“Fuel pump”).
•
DOF.1034
(“Fuel pump solenoid”).
The output for the pump control is mandatory (otherwise this function is disabled).
The output for the electromagnetic valve is optional. When it is used, it is necessary to
configure a delay in P.0405
parameter (“delay between solenoid valve and fuel pump”): HS315
guarantees the opening of the solenoid valve P.0405 seconds before activating the pump,
and the opening of the solenoid valve P.0405 seconds after closing the pump. All that to avoid
that the vacuum caused by the pump within the fuel circuit could bring about some
malfunctioning of the solenoid valve (it could get stuck).
HS315 controls the pump based on the fuel level and based on the working mode:
•
AUTOMATIC. Referring to the position evaluated in the previous paragraph, the
pump:
o
Activates if the level is “start”, “low” or “minimum”.
o
Deactivates if the level is “stop” or “maximum”.
o
Retains the actual command if in “hysteresis”.
•
MANUAL-ON. Pump can be activated and deactivated according to operator needs.
However, the controller prevents the start if the level (see previous paragraphs) is
“stop” or “maximum”.
•
MANUAL-OFF. The pump is deactivated
HS315 can anyway stop the pump (even if the previous logic would require its start) when the
following conditions are present:
•
In case anomalies activated by the digital inputs configured through the functions are
active:
o
DIF.4051
“warning (turns off the fuel pump))”.
o
DIF.4052
“unload (turns off the fuel pump))”.
o
DIF.4053
“Deactivation (turns off the fuel pump))”.
o
DIF.4054
“Lock (turns off the fuel pump))”.
Warning: it is the anomaly that stops the pump, not the activation of the input.
•
In case anomalies activated by thresholds on analogue inputs are active
(P.4003...P.4008 parameters for analogue input 1). This happens only if the anomaly
has been specifically configured to stop the pump, through the bit 14 of the threshold
configuration parameter (P.4005 for the first threshold on the first analogue input).
Warning: it is the anomaly that stops the pump, not the activation of the input.
•
Moreover, you can set the maximum fuel pump activation time with parameter P.0404.
This parameter should be used to set the time needed for the pump to fill the
equipment tank, in the worst conditions: empty tank and engine started at maximum
power. If the pump stays in motion (both from manual and automatic control) for a
longer time span, the board activates W064 early warning: in fact, it is likely the
presence of a failure of the pump or, anyway, that the pump is not drawing from the