Huber Pilot ONE Unistat T300 Series, Operation Manual

Page: 49 / 90

Setup mode
Chapter 4 OPERATION MANUAL
V1.2.0en/12.05.15//14.06
Liability for errors and misprints excluded. Unistat® T300 Series
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4.2.8.1.3 Dialog entry: “With Preliminary Test” (only with Unistat)
In some complex applications, the “Fast Identification” of the control circuit may not yet lead to
optimum control. This can happen, in particular, if the hydraulic build-up cannot be adjusted to the
necessary circulation volumes. Further information on this is provided on page 30 in the Section »To
be noted when planning the test« .
A further optimization of control behavior can be achieved if you select the control parameterization
“With Preliminary Test”. With this, the control parameters within the set limits of the minimum and
maximum setpoint are determined. Temperature control is then also carried out to the setpoint
limits in some circumstances.
Before starting the automatic controller parameterization, verify the correct setting of the mini-
mum and maximum setpoint. A limitation to the actually used operating temperaturerange is
advantageous. Do not make any changes to the temperature control unit and to the application
(temperature control unit / external application) after your system has been started. Changes
include e.g. filling / draining process chamber, changing the mixerspeed, change of position of
Pt100 process sensor etc.
Since the working temperature range can sometimes be very large, finding the parameters takes
correspondingly longer in this mode. The control defines up to three temperature setpoints and
automatically processes them one after another. One of these is below room temperature, one
roughly at room temperature and one above room temperature, if the setpoint limits allow this.
PROCEDURE

Before setting the control parameters, make sure that the temperature control unit has reached
the set setpoint and has been controlling the temperature at this setpoint for a few minutes. Do
not stop the temperature control.

Do not make any changes to the temperature control unit and the application during parameter
determination.

Go to the “Categories Menu”.

Tap on the category “Temperature Control”.

Tap on the category “TAC/Manual”.

Tap on the sub-category “Configuration auto”.

Tap on the sub-category “Find parameters”.

Tap on the dialog entry “With Preliminary Test”.

Confirm your choice by tapping on “OK”.

Read the message displayed and confirm it by tapping on “OK”.

Select the thermal fluid used from the list.

Confirm your choice by tapping on “OK”.

Choose between the dialog entries “Internal” and “Process (Cascade)”.

Confirm your choice by tapping on “OK”. Setting the control parameters using “With Preliminary
Test” starts and a message appears on the touchscreen after a while.

Read the message displayed and confirm it by tapping on “OK”.
4.2.8.2 Sub-category: “Control Dynamics”
You can choose between a faster tuning performance with a possible and accepted small tempera-
ture overshoot and a tuning performance without temperature overshoot. The default setting is
“Fast, small overshoot” .
The overshoot always refers to the leading temperature. Example: The process temperature, if
activated, is the leading temperature. In contrast, the bath or flow temperature must always be
leading the process temperature. In order to achieve the best possible energy transfer, the greatest
possible temperature difference between the bath or flow temperature and the process tempera-
ture is necessary (see figure " »Representation of an optimum process temperature control« from
page 46 in section »Temperature control to process temperature« ). This always requires the maxi-
mum possible thermal fluid flow rate. In the setting “Faster, small overshoot” , the combination of
high thermal fluid flow rate and the superbly designed control electronics hardly ever results in an
overshoot of the process temperature, while reaching the setpoint as quickly as possible. The oppo-
site to the mode “Faster, small overshoot” is available in the setting “Without overshoot”. The
target temperature is approached more cautiously and thus aperiodic. It takes longer to adjust to
the selected setpoint. The statement “without overshooting” is only valid with little external dis-