4.8 How the MT Controller Works
Mold-Masters controllers are designed to perform in closed and open loop
congurations. We consider that the normal operating mode is closed loop.
This is illustrated in the following diagram and explained below.
The zone controller slowly ramps up the heater power and simultaneously
looks for a positive temperature change at the thermocouple input. The
controller veries the actual rate of rise against a predetermined value in
program parameter r1. Power is slowly increased until the correct rate of rise
is achieved.
At ramp temperature rE, the dwell time rt is activated (2 minutes), this permits
any residual moisture in the heating elements to be eliminated. After all zones
reached to ramp temperature, they will start heating up together again.
The controller continues to ramp up the temperature to the set point with the
speed set in program parameter r2, which should be achieved with minimum
overshoot.
Having built a virtual model to map the tool and heater characteristics, the
controller can maintain the temperature at an accurate point with virtually no
deviation.
4.8.1 Set the Ramp Feature (On / Off)
Normally the controller starts to heat a zone and then it pauses at around
120° C for two minutes to dry out any damp that may be present.
If you prefer not to wait for this dwell period then you can use the “Ramp”
feature to skip the delay period to reach molding temperature more quickly.
See page 5-9 for full description.
4-6
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MT Controller User Manual
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