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5-2
Automatically Adjusting a
Water-cooling Output (for
Water-cooled Extruders)
Overview
Mainly, this function simultaneously suppresses temperature variations in water-cooled extruders for
the following two factors to maintain stable performance.
1. When the heat of vaporization is used as a cooling method, such as in water-cooled extruders,
the cooling performance is nonlinear, so temperature variations can occur.
The water-cooling output adjustment function automatically suppresses hunting that occurs due
to a water-cooling output.
2. With traditional auto-tuning, temperature variations can occur when changes in conditions during
operation cannot be handled.
The water-cooling output adjustment function constantly monitors temperature changes and
updates the cooling-side proportional band to help suppress temperature variations. You can
disable water-cooling output adjustment after temperature variations have subsided to continue
control with the cooling-side proportional band that was being used.
We recommend that you use water-cooling output adjustment in the following cases.
• If temperature variation occurs due to changes in the water-cooling system
• If temperature variation occurs due to changes in the cooling valve settings
• To reduce the amount of work required to adjust cooling valves
Water-cooling output adjustment works to suppress hunting by automatically increasing and
decreasing the following value.
• Increasing the Cooling-side Proportional Band
The Proportional Band (Cooling) parameter is adjusted to suppress the width of temperature
variations.
• Decreasing the Cooling-side Proportional Band
If disturbances results from heat generated by the material in the extruder or by screw friction,
hunting will occur if the cooling capacity is too weak.
The Proportional Band (Cooling) parameter is adjusted to reduce the influence of hunting.
Temperature
E5@D Digital Temperature Controllers User's Manual (H224)
5 Advanced Operations
Time
5
5 - 7
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