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

Monitoring and protective functions
8.5 Thermal motor protection
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 filters
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.
8.5.11.1

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.
Temperature measurement with a 3-wire sensor
With p4108[0...5] = 2, you evaluate a sensor in a 3-wire system at a 4-wire connection at
terminals 3 and 4. The measuring cable is connected to terminal 1. You must short-circuit
terminals 2 and 4.
Temperature measurement with a 4-wire sensor
With p4108[0...5] = 3, you evaluate a sensor in a 4-wire system at a 4-wire connection at
terminals 3 and 4. The measuring cable is connected to terminals 1 and 2.
You can find additional information in function diagram 9626 in the SINAMICS S120/S150
List Manual.
444
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), 01/2012, 6SL3097-4AB00-0BP2
Drive functions