Temperature Inputs (Temp) - Siemens 7SR105 Rho User Manual

4.7

Temperature Inputs (TEMP)

Temperature inputs (Six RTDs) can be selected from the following types:
• Pt100
• Pt250
• Pt1000
• Ni100
• Ni120
• Ni250
•
Cu10
Each monitored input can be independently programmed to provide alarm and trip thresholds giving
instantaneous outputs. Outputs can be assigned to each of the temperature inputs. The value returned by each
temperature input can be displayed.
Temperature Input n Enable setting
Up to Six Temperature Inputs (RTD) can be monitored.
Temp Input n Alarm setting
An alarm output is available where the measured temperature exceeds the alarm setting.
Temp Input n Trip setting
A trip output is available where the measured temperature exceeds the trip setting.
Temp Input n Gating setting
Further security is provided by allowing each temperature input to be AND gated with other input(s). If this feature
is selected then no trip will be issued unless all gated inputs detect temperature above the trip setting. The
temperature input alarm outputs are not gated.
Temp Input Fail Protection
Each active temperature input can be internally monitored for short circuit, open circuit failure and out of limit. A
temperature input fail alarm output is generated by a failure condition and the failed input is identified in
the Instruments Menu. No trip or alarm output is given by a failed input.
Temp Input Scaling factor
Each Temperature input can be multiplied by different scaling factors. The scaling factor is applied in the
temperature input values and the Temp Trip & Alarm functions will operate on the basis of scaled input. If the
scaling factor is less than 1, then the Maximum Trip and Alarm settings also will get reduced. (For example,for
scaling factor 0.5, the maximum Trip & Alarm settings will be 0.5 x 260°= 130°).
©2018 Siemens Protection Devices
Gn Temp Input n Enable
Gn Temp Input n Alarm
Gn Temp Input n Trip
Gn Temp Input n Gating
Gn Temp Input n Scaling Factor
Temp input
>
1
2
3
4
&
5
6
Figure 4-7 Logic Diagram: Temperature Inputs (TEMP)
7SR105 Rho Description of Operation
Temp n Alarm
Temp n Trip
Temp n Fail
Chapter 1 Page 43 of 57