134 GC250 Technical Manual
EAAM057608EN
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).
11.1.2
To use this function requires:
To use this function (
) it is necessary to:
Make sure you have a contact level transducer.
Configure the controller to control the pump in accordance with said transducer
(parameter P.0401=1).
Connect at least the pump start/stop contacts respectively to two configurable inputs
of the controller.
If connected, the minimum, low and high fuel level contacts are also used.
Warning: if the first two conditions are met, the controller will control the pump no matter what
the connected contacts are. In particular, the contacts related to the last connection are used
even though relevant operation times are set to zero (for disabling anomalies). So, please pay
attention to configuration. Last, contacts must match the following pattern: Active after
detection of the engine running status, even when it is started manually.
Minimum level contact (input with feature DIF.4211): closed if the level is below the
minimum level threshold.
Low level contact (input with feature DIF.4212): closed if the level is below the low
level threshold.
Start-up contact (input with feature DIF.3301) closed if the level is below the pump
start-up threshold.
Stop contact (input with feature DIF.3302) closed if the level is below the pump stop
threshold.
High level contact (input with feature DIF.4213): closed if the level is
over
the pump
stop threshold.
11.1.3
Level evaluation
The controller assigns the actual fuel level by calculating in the order all the following
evaluations:
If the level is
lower than the pump start threshold, the controller assigns the “start”
position.
If a low level threshold exists, and the level is lower than threshold, the controller
assigns 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.
11.1.4
Automatic pump control
Basically, if you want to reverse the logic of an output you need to add the corresponding value
into its parameter:
Activates if the level is “start”, “low” or “minimum”.
Deactivates if the level is ”stop” or “maximum”.
Retains the actual command if in
“hysteresis”.
