Measurement With Up To 6 Channels - Siemens SINAMICS S120 Function Manual

Monitoring functions and protective functions
10.2 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.
– For switching temperature sensors, such as PTC and bimetallic NC contact, two limit
– r4105[0...11] = ‑50° C: The actual temperature value is below the rated response
– r4105[0...11] = +250° C: The actual temperature value is above the rated response
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 10-6
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.
10.2.7.1

Measurement with up to 6 channels

Temperature measurement with a 2-wire sensor
With p4108[0...5] = 0, you evaluate a sensor in a 2-wire system at a 4-wire connection at
terminals 1 and 2. Terminals 3 and 4 remain open.
616
values are displayed symbolically:
temperature.
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, 06/2019, 6SL3097-5AB00-0BP2
Drive functions