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Functions
2.17 Temperature Detection via RTD Box
Processing Temperatures
The evaluation of the temperatures measured via RTD box or the internal measuring function (temperature de-
tection via I/O 2 extension module) is identical.
The temperature raw data are converted into a temperature in degrees Celsius or Fahrenheit. The conversion
depends on the temperature sensor used.
For each temperature detector two threshold decisions can be performed which are available for further pro-
cessing. The user can make the corresponding allocations in the configuration matrix.
Each temperature sensor issues an alarm in case of a short-circuit or interruption of the sensor circuit or if a
sensor is configured but not assigned. Additionally, a group indication is formed across all temperature sensors
of the RTD box, or across all temperature sensors when measuring the temperature via the I/O 2 extension
module (14101 „Fail: RTD").
An error message is generated when the communication between RTD box and protection device is faulted or
in the event of an internal fault of the internal temperature measurement. Indication 264 „Fail: RTD-Box
1"( for RTD 1 through RTD 6) or 267 „Fail: RTD-Box 2" (for RTD 7 through RTD 12) for temperature de-
tection via RTD box, indication 208 „Fail: RTD int." for temperature detection via I/O 2 extension module.
Figure 2-94 shows the logic diagram of the temperature processing via RTD box. The manual supplied with the
RTD box contains a connection circuit diagram and a dimensioned drawing.
Figure 2-95 shows the logic diagram of the temperature processing via I/O 2 extension module.
Figure 2-94
Logic diagram of temperature processing for thermobox
246
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
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