Setup mode
OPERATION MANUAL
Chapter 4
Unichiller®
V2.3.0en/07.06.19//17.12
52
4.2.4
Delta T limiter
The Delta T limiter is a part of the temperature control which protects the system or the process.
The Delta T limiter is given a limit value. The Delta T limiter then reacts when the limit value is
reached during heating or cooling.
The temperature control mode “Process (Cascade)” evaluates the temperature difference between
the flow temperature and the process temperature. The default setting of the limit value is 100 K. If
the limit value and the temperature sensor are set properly, the load limits, e.g. from a glass appa-
ratus, are not exceeded. As the limit value is approached, the cooling or heating capacity is adjusted.
The DeltaT limiter is
not
a safety device.
4.2.5
Monitoring the Pt100 temperature sensors
The Pt100 temperature sensors are constantly monitored for their electrical status. If the status
“Sensor faulty” occurs during temperature control, the temperature control process is stopped
immediately and a device message is displayed. This applies for all temperature sensors connected
within the temperature control unit.
4.2.6
Optimum control parameters for optimum temperature control
If the adjustment of the temperature does not correspond to the quality of the illustrations shown
above, you can adjust the control parameters. With Huber temperature control units, there are
various ways of finding the optimum control parameters. Depending on the facilities of the tempera-
ture control unit, you can choose the following processes:
▪
Use ex-factory parameters
(standard)
▪
Estimate Control Parameters
(only useful for bath thermostats with E-grade Basic and
internal control)
▪
Fast Identification
(from E-grade Exclusive)
▪
With Preliminary Test
(from E-grade Exclusive)
4.2.7
Sub-category: “Select auto/expert mode”.
Use of the “Expert mode” without a thorough knowledge of I&C technology.
MATERIAL DAMAGE TO THE APPLICATION
Only use this mode if you have a thorough knowledge of I&C technology.
Here you can select whether the control parameters are set in the “Automatic mode” or in the
“Expert mode”. To enter settings in “Expert mode” requires in-depth knowledge of process measur-
ing and control technology. Incorrect or insufficient settings can severely impair the function of the
temperature control unit.
In “Expert mode”, “Configuration auto” is deactivated and only “Configuration manual” is possible.
Representation of an
optimum process
temperature control
