Siemens SINAMICS S120 - Page 656

Monitoring functions and protective functions
9.5 Thermal motor protection
Drive functions
656 Function Manual, 11/2017, 6SL3097-4AB00-0BP5
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.
– For switching temperature sensors, such as PTC and bimetallic NC contact, two limit
values are displayed symbolically:
– 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.
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 9- 6 Selecting the sensor types
Value of p4100[0...11]
Temperature sensor
Temperature display range r4105[0...11]
0
Evaluation disabled
-
1
PTC thermistor
-50° C or +250° C
2
KTY84
-99° C to +250° C
4
Bimetallic NC contact
-50° C or +250° C
5
PT100
-99° C to +250° C
6
PT1000
-99° C to +250° C
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.