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Operation
8.6
8.6.1 Control parameter
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Thermodynamics
The device works with a PID control. Experience has shown that the control
parameters set ex works achieve an optimal temperature sequence in the
sample.
The internal and external control parameters can be adjusted in the submenu
<Control performance>.
For internal control, the control dynamic can be set to either Standard or
Aperiodic:
•
With Aperiodic the temperature increase is temporally offset, so that the
actual temperature doesn't overshoot
•
With Standard the temperature increase is faster, but the actual
temperature can overshoot by up to 5%
Proportional range Xp
The proportional range Xp is the temperature range between the setpoint value
and the actual value, in which the heating capacity can be adjusted from 100%
to 0%. The value for Xp can be selected between 0 K and 10 K.
Integral controller Tn
The integral controller Tn is indicated in seconds. It reduces the difference
between the setpoint value and the actual value caused by the Xp component,
and keeps to the setpoint value.
Differential controller Tv
The differential controller Tv is specified in seconds. It shortens the regulation
time.
CoSpeed factor
The CoSpeed factor affects the temperature sequence when used with external
control. It directly affects Xpu and causes more aggressive temperature control.
Proportional range Xpu
The proportional range Xpu plays a role in external control. It corresponds with
the proportional range Xp for internal control.
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