Setting Controls; Timer Period For Release Of Pump And Empty Signal - Ecolab CONNEXX Basic Manuel Technique

4.4.4

Setting controls

The suction time monitoring function can be adjusted with the DIP switch on the circuit
board (see chapter 4.2).
Fig. 4.12
Switch 1 will be set at the factory in accordance with the appliance design. Resetting is
NOTE
only necessary if retrofitting Connexx Basic with the container switchover capability, or in
the case of Connexx Switch, if replacing the control unit.
ATTENTION
Before opening the cover always switch off and from the net separate control!
4.4.5

Timer period for release of pump and empty signal

The enable signal for the metering pumps (PUMP Enable) is only output if the level switch is
at the uppermost position, in other words if there is enough product in the lifting vessel. If
the level in the lifting vessel drops for longer than 5 seconds, due to air being drawn out of
the emptied container, the enable signal for the pump is interrupted.
The empty signal to the container is restored after an adjustable timer period, started by the
level switch in its lowest position. If this time expires without the level being reached again,
and empty signal is output for the active container and the compressed air supply
interrupted. The switchover to the other container takes place automatically if the latter is on
standby.
The time for the empty signal can be set by means of the DIL switch on the control PCB in 2
steps between 2 and 30 seconds (see chapter 4.4.4). A suction time of 10 seconds is preset
ex-works. Upon commissioning the time must be adapted to the conditions that are then
present (see chapter
In essence, the time is influenced by the length of the suction line(s), the suction power
obtainable at the injector, and the total capacity of the connected pumps. Long suction times
have the advantage that the containers are emptied to the best possible extent, which is not
possible with conventional suction lances. The time should therefore be set to long enough
to allow the upper level in the lifting vessel to be reached again during a switchover process,
even with the pumps running.
Long suction times are not possible with large pump capacities, since the lifting vessel is
quickly emptied if there is a shortage of product in the container and the pump then starts to
draw in air. The enable signal (Pump Enable) is therefore generally interrupted after 5
seconds until the level in the lifting vessel is reached again.
In the case of critical processes for which any interruption in metering is to be avoided if at
IMPORTANT
all possible, the suction time must be set as appropriately short. This increases the
residual quantity left in the container.
417101375_Connexx.doc
6 "Start Up").
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