4 | Description of project
Page 16 of 104 CIRUS
®
UPT-6400 VERSION 1 | EN-US
Note
The application report is needed to position and determine the essential components.
4.5.2 Heating element
DANGER
Fire hazard due to overheating of heating element
A defect in the control loop can cause the heating element to overheat and compo-
nents to catch fire.
Install a contactor Kb in the control loop.
Install a temperature monitor at the sealing bar.
DANGER
Fire hazard due to unsuitable heating element
An unsuitable heating element can overheat and cause components to catch fire. The
heating element can burn through, creating an arc in a certain limited space.
Install touch protection.
Use only heating elements intended specifically for this purpose.
Comply with the application report.
Unsuitable heating
elements
For operation with the temperature controller CIRUS
®
UPT-6400, only CIRUS
®
heating
elements may be used.
Notes
• A suitable temperature coefficient (TCR) of the heating element is essential to the
measurement principle.
• If the temperature coefficient of the heating element is greater than the set value,
the actual temperature is lower than the displayed temperature. But if the tempera-
ture coefficient of the heating element is less than the set value, the actual temper-
ature is higher than the displayed temperature.
• The resistance value rises as the heating element gets warmer. If the temperature
coefficient of the heating element is below the permitted range, the control loop
can fluctuate or the heating element can overheat.
AUTOCAL
• Due to its design, the base resistance of the heating elements increases steadily
during operation. For this reason, AUTOCAL has to be performed again after
about 100,000 sealing cycles to prevent measurement errors.
4.5.3 Pulse transformer
DANGER
Danger, high voltage and overheating
Incorrect assembly and installation of the pulse transformer impair electrical safety.
Install touch protection.
Select the proper cable cross-section.
Comply with the application report.
The pulse transformer is a component of the control loop. It is attached between the
temperature controller and the voltage supply connection to the heating element. The
pulse transformer supples the voltage required by the heating element and is de-
signed for the individual application; refer to the application report.
The following requirements have to be met:
To Next Page