Siemens SINAMICS S120 Function Manual page 550

Monitoring and protective functions
8.5 Thermal motor protection
Selecting the sensor types
● p4100[0...11] sets the sensor type for the respective temperature channel.
● r4105[0...11] indicates the actual value of the temperature channel.
Note
For PTC and bimetallic NC contact the following applies:
What is shown in r4105[0...11] does not correspond to the actual temperature value.
Table 8- 6
Value of p4100[0...11]
Measuring the cable resistances
When using 2-wire sensors, to increase the measuring accuracy, the cable resistance can
be measured and saved. To do this, short-circuit the sensor cable as close as possible to the
sensor. The procedure is described in the SINAMICS S120/150 List Manual under
p4109[0...11]. The measured cable resistance is then taken into account when evaluating
the temperature. The cable resistance value is saved in p4110[0...11].
Line filter
A line filter is activated to suppress noise radiated from the line supply. Using p4121, the
filter can be set to a 50 Hz or 60 Hz line frequency.
548
– For switching temperature sensors, such as e.g. PTC and bimetallic NC contact,
symbolically two limit values are displayed:
– r4105[0...11] = -50° C: The actual temperature value is below the rated response
temperature.
– r4105[0...11] = +250° C: The actual temperature value is above the rated response
temperature.
Selecting the sensor types
Temperature sensor
0 Evaluation disabled
1 PTC thermistor
2 KTY84
4 Bimetallic NC contact
5 PT100
6 PT1000
Temperature display range r4105[0...11]
-
-50° C or +250° C
-99° C to +250° C
-50° C or +250° C
-99° C to +250° C
-99° C to +250° C
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Drive functions