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4.11.3
Functionality
The RTD based thermal protection function 38 is used as a general protection with many
possible application areas as it has flexible measuring and setting facilities. The function
can be used as an under- or overprotection with a settable absolute hysteresis limit. The
function operates with the definite time (DT) characteristics.
The function contains a blocking functionality. It is possible to block function outputs, the
definite timer or the function itself, if desired.
4.11.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The corresponding
parameter values are “Enable” and “Disable”.
The operation of MAP can be described using a module diagram. All the modules in the
diagram are explained in the next sections.
GUID-B9FE9FD4-3C86-4B1B-A377-8056B82639D3 V1 EN
Figure 383:
Functional module diagram
Level detector
The level detector compares
AI_VALUE
to the
Pickup value
setting. The
Operation mode
setting defines the direction of the level detector.
Table 660:
Operation mode types
Operation Mode
Description
"Under"
If the input signal
AI_VALUE
is lower than the set
value of the
Pickup value setting, the level detector
enables the timer module.
"Over"
If the input signal
AI_VALUE
exceeds the set value of
the
Pickup value setting, the level detector enables
the timer module.
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
763
Technical Manual
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