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CB / CB-UL, CBF / CBF-UL (E7) 07/2021 Page 109/197
12.2.1 Safety controller modes
You can select between “Limit (absolute)” and “Offset (relative)” safety controller mode
• Limit: Absolute maximum permitted temperature value
This setting offers high safety as a defined temperature limit will not be exceeded. It is important to adapt
the safety controller set-point after each modification of the temperature set-point. Otherwise, the limit
could be too high to ensure efficient protection, or, in the opposite case, it could prevent the controller
from reaching an entered set-point outside the limit range.
• Offset: Maximum overtemperature above any active temperature set point. The maximum temperature
changes internally and automatically with every set-point change.
This setting is recommended for program operation. It is important to check the safety controller set-
point and safety controller mode occasionally, as it does not offer a fix, independent limit temperature
value, which would never be exceeded.
Example: Desired temperature value: 37 °C, desired safety controller value: 39 °C.
Possible settings for this example:
Temperature set point Safety controller mode Safety controller set-point
37 °C
Limit (absolute) 39 °C
Offset (relative) 2 °C
12.2.2 Setting the safety controller
Press the Setpoint setting icon to access the “Setpoint” setting menu from Normal display.
“Setpoints” menu.
Select the field “Safety controller” to access the
settings.
•
In the field “Mode” select the desired setting
“Limit” or “Offset”.
• Select the corresponding field “Limit” or “Offset” according to the selected mode and enter the desired
safety controller setpoint. Confirm entry with Confirm icon.
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