Sices HS 315, Техническое руководство

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Technical Handbook 163
To use this function:
•
The level analogue transducer should be connected to one of the analogue inputs of
HS315 or to DIVIT expansion modules. The utilized analogue input should be
configured through AIF.1220 functions (dedicated to VDO sensor, 0%-180 Ohm,
100%-0 Ohm) or through AIF.1221 function (configurable).
•
Set the thresholds to activate/deactivate the pump (parameters P.0402 and P.0403).
•
In case they are configured, also minimum, low and high fuel level are used (P.0347,
P.0345, P.0343 parameters): they are used even if the relevant intervention times are
set to zero (to disable anomalies).
Very important is the thresholds setting which should be ranked by level (from down up), as
follows: minimum, low, start, stop, high. As already explained, the controller operates even if
thresholds are not in this order; all you need is the first three ones lower than the last two ones
(within each of the two groups they can be swapped, but it is not recommended).
To use this function, it is necessary to connect the contacts of the float to the analogue inputs
of the board, by using the functions:
•
DIF.4211
(“Minimum fuel level”): input activated if the level is under minimum level
threshold.
•
DIF.4212
(“Low fuel level"): input activated if the level is under low level threshold.
•
DIF.3301
(“Level for the fuel pump starting”): input activated if the level is under pump
starting threshold.
•
DIF.3302
(“Level for the fuel pump stop”): input activated if the level is
under pump
stopping threshold.
•
DIF.4213
(“High fuel level”): Input active if the level is
above high-level threshold.
The inputs configured through DIF.3301 and DIF.3302 functions are mandatory, the other
three are optional. If they are present, they will be used even if the delay for the relevant input
has been set to “0” to disable the anomaly.
The controller assigns the actual fuel level by calculating in the order all the following
evaluations:
•
If the level is lower than th
e pump start threshold, the controller assigns the “start”
position.
•
If a low-level threshold exists, and the level is lower than threshold, the controller
ass
igns the “low” position.
•
If a minimum level threshold exists, and the level is lower than the threshold, the
controller assigns the “minimum” position.
•
If the level is higher than the stop threshold, the controller assigns the “stop” position.
•
If a maximum level threshold exists, and the level is higher than the threshold, the
controller assigns the “maximum” position.
•
If none of the previous condition is met, the controller assigns the “hysteresis” position.