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there is many difficult problems of plastic injection machine for example in Electrical problem in PLCs (automation)... so on
There may be several problems and you have to identify these problems.
The problem may be of the hydraulic/Pneumatic part, Electric panel, sensor, PLC or of mechanical parts such as clamping mechanism.
Number one problems in automated plastic injection machines are as aresult of defective sensors. failed sensors always may result to incorrect production in the plastic industry.
Apart from sensor PLC programs can be sometimes be set wrongly. an incorrect parrameter will always result to an incorrect product.
First thing you have to do is locate the problem step by step to find out if its from sensors, automation modules or any other component.