How many signals (electro valves) must I have from the injection machine to control the vacuum process using the VV-SET and vacuum through the ejectors controlled by a VJ unit?

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Accepted Answer

Two independent signals:

One to control the VV-SET. Is must open and close the pneumatic piston before injection. It has to be synchronized with the machine regarding the injection cycle.

Another for the vacuum through the ejectors. Depending on the size of the ejectors and the clearance on them, the circuit should be opened and closed, if there is a lot of vacuum made through the ejector the plastic part can become deformed when ejecting. If the ejectors are small or the clearance of them is small, vacuum can be made throughout the whole cycle, no need to close the air circuit, it can be open always.

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How many signals (electro valves) must I have from the injection machine to control the vacuum process using the VV-SET and vacuum through the ejectors controlled by a VJ unit?

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