Mold-Masters TempMaster XL-2 Series, Руководство пользователя

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How the XL-2 Controller Works XL-2 Manual
Page 14
Mold-Masters
®
Revision 1.1
How the XL-2 Controller Works
Mold-Masters
®
controllers are designed to perform in closed and
open loop configurations. However, we consider that the normal
operating mode is closed loop. This is illustrated in the following
diagram and explained below.
1. The zone controller slowly ramps up the heater power and
simultaneously looks for a positive temperature change at the
thermocouple input. The controller verifies 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.
2. At ramp temperature rE, the dwell time rt is activated (2minutes),
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.
3. 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 over-shoot.
4. 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.
Set Point
Time
T
emper
atu
re
rt
rE = 120°C
3
1
2
4