v 2.3 — September 2015 Altanium Delta3
84 Possible Causes of Oscillation
"D" too large Stepped power change too large for the rate of change of temperature.
Shear An important issue often overlooked is the effect of shear in the material as
it passes through the gating area. This can cause rises in temperature in
excess of 33 °C (60 °F) under severe conditions. Therefore, if large
temperature variations occur during molding, it is worth plotting this
variation against the molding cycle time. As the controller cannot initiate
additional cooling, it is only possible to minimize this effect with properly
selected PID terms.
Table 7-7 Possible Causes of Oscillation (Continued)
Cause Description
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