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Basically, the control of the CVL unit can be based
on 2 principles; timed via timer or signal controlled
via input from eg. injection moulding machine or
level sensor. The diagrams for the following
described processes can be seen at the back of the
manual.
The diagrams consist of:
•
Principle setup
•
Sequence diagram
•
Electrical diagram
Time-controlled process (Program 1)
Diagram A - Here the internal timer in the CVL controls
when the top and bottom valves open and close. The
CVL is only controlled by this timer function. Program
1 is used when the CVL must draw components from a
plant that produces a constant amount of components
per unit of time (batch production) and it is not neces-
sary to synchronize the CVL with the plant.
This operating mode can be equipped with start / stop
contact, whereby the CVL can be stopped when eg. an
injection moulding machine is also stopped. Likewise,
the CVL can be started when the injection moulding
machine is restarted.
Prerequisites:
•
Program 1 is selected
•
Any start / stop contact is connected to terminals 9
and 10, or a loop mounted between terminals 9 and 10
•
Reset function is looped with loop between termi-
nals 11 and 12
Signal-controlled process (Program 2/3/4)
Here the top and bottom valves are controlled by a sig-
nal given to the CVL's control. This signal could eg. be
from an injection moulding machine or from the level
sensor in the CVL.
This operating mode can be equipped with start / stop
contact, whereby the CVL can be stopped when eg. the
injection moulding machine is also stopped. Likewise,
the CVL can be started when the injection moulding
machine is restarted.
In addition, it can be equipped with a reset switch that
allows the CVL to start after eg. a certain number of
discharges have been reached.
Diagram B (Synchronized process) - Should the
components be moved from eg. an injection moulding
machine to fixed portions, with the moulding machine
as master, this mode of operation is used. Hereby the
moulding machine will decide when the CVL is dis-
charging. This operating mode can be equipped with
start / stop contact, whereby the CVL can be stopped
when eg. the injection moulding machine is also
stopped.
Prerequisites:
•
Program 2 is selected
•
Any start / stop contact is connected to terminals
9 and 10, or a loop mounted between terminals 9
and 10
•
Reset function is looped with loop between termi-
nals 11 and 12
•
Terminals 13 and 14 are connected to a potential-
free contact set on the injection moulding machine
Be aware that T3 and N are set in the control, see "Op-
erating the control".
Diagram C (Continuous process) - Should compo-
nents be drawn, typically from a magazine, with dis-
charge when a preset level in the CVL is reached, this
mode of operation is used. After discharge, the process
is repeated. This operating mode can be equipped with
start / stop contact, whereby the CVL can be stopped
when eg. the magazine is emptied.
Prerequisites:
•
Program 2 is selected
•
Any start / stop contact is connected to terminals
9 and 10, or a loop mounted between terminals 9
and 10
•
Reset function is looped with loop between termi-
nals 11 and 12
•
Terminals 13, 14 and 23 are connected to the level
sensor
Diagram D (Transport to external container with
level sensor) - Should components be drawn, typi-
cally from a magazine, with discharge in a container
equipped with full- and empty sensor, this operating
mode is used. The full- and empty sensor controls the
CVL, and ensures, that there are always components
in the container. This operating mode can be equipped
with start / stop contact, whereby the CVL can be
stopped when eg. the magazine is empty.
It is optional if the blower should be started and
stopped by the control, or run constantly. If case the
blower should be controlled by the CVL control, the
blower must be connected, see diagram D.
Prerequisites:
•
Program 2 is selected
•
Any start / stop contact is connected to terminals
9 and 10, or a loop mounted between terminals 9
and 10
•
Reset function is looped with loop between termi-
nals 11 and 12
•
Terminals 13, 14 and 23 are connected to the level
sensor
•
Terminals 15, 16 and 24 are connected to the full
sensor
•
Terminals 17, 18 and 25 are connected to the
empty sensor
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