PRODUCT
DESCRIPTION
30.30.01.00559/05 | 06.2020
2.2 General description of the functions
The VOC is used to control and maintain a specific operating vacuum and as a liquid separator for
evacuated liquid media with a low to medium level of pollution.
Please note that the liquid in the storage tank can only drain out if the liquid line ends below
the level of item [6]!
The VOC provides an interface between the machine and the clamping system and generates the
retention force between the clamping device and workpiece together with the clamping device. The media
evacuated as a result of the vacuum generation is fed from the clamping device through the VOC.
Liquids contained in the evacuated medium are separated by the VOC and collected in the storage tank.
This stops liquids from entering the vacuum generator, item [2].
The entry of liquids damages the vacuum generator, item [2], and may even result in a complete failure.
The liquid that collects in the VOC as a result of the evacuation of the vacuum clamping device is stored
in the bottom glass container. If the fill volume exceeds approx. 1.5 - 2 litres, fill level sensor [2Z1], item
[12], (cf. Chap. 3.2) sends a signal to the system that the feedback process can be started.
Fill level sensor [2Z1], item [12], continues to send a signal until the liquid level in the storage tank falls
below this range. The liquid feedback process stops once fill level sensor [2Z1], item [12], stops emitting a
signal. This means that the storage tank has been sufficiently drained.
Under the following operating conditions the loss of the vacuum results in the loss of the retention force
on the workpiece and means that the workpiece is no longer clamped in place.
WARNING
Loss of clamping force due to a loss of vacuum
Personal injury and property damage due to workpieces accelerated by
machining forces
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This must be taken into account when designing the overall machine.
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Individuals are not permitted to stay in the hazard area during the
machining process.
If more liquid is separated from the evacuated medium than can be conveyed out of the VOC by the
feedback process, the storage tank will constantly fill with liquid to the critical level despite continuous
draining. This condition is detected and signalled to the machine control unit by fill level sensor [1Z1], item
[3], when the container is half full ("Machine/Coolant supply STOP").
In order to prevent the liquid from reaching the vacuum generator, item [2], the storage tank must be
drained completely when this signal is emitted. The machining of the workpiece and the supply of liquid in
the CNC processing centre must be at a complete stop as long as the signal continues to be emitted by
fill level sensor [1Z1], item [3], in order to ensure that no additional liquids are sucked in.
