Functionality
USER MANUAL FPC 200 - 3/2017 59
Thermal switch protection – ANSI code 26
2.5.7.1 Description
Thermal switch protection is an external protection
device, mounted on the machine. Thermal switch
usually consists of two binary signals, by which one is
alarm temperature signal and another is trip
temperature signal. Protection consists of two instances
first dedicated to external trip signal and second to
external alarm signal.
It is recommended that external trip
temperature signal immediately trips CB
while external alarm temperature signal
acts as a warning that indicates overheating
of the machine.
2.5.7.2 Setting parameters
Enabling protection function.
Enabling protection function separately for each group level.
Time stabilization of fault detection. As a filter of short disturbances on
measuring circuits. Time before protection starts.
Time stabilization of pickup signal. Time when the monitored value is
outside the operating range, but the protection does not stop yet.
None
Variable 1
Variable 2
Variable 3
Variable 4
Source of blocking signal.
Table 51 Thermal switch function parameters.
2.5.7.3 Associated digital inputs
External trigger of Thermal switch 1 protection.
External trigger of Thermal switch 2 protection.
Table 52 Digital inputs associated with the function.
2.5.7.4 Counters
Total consecutive number of pickup signals.
Consecutive number of trip signals.
Table 53: Counters presented in thermal switch protection.
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