Forming Groups Of Temperature Sensors; Evaluating Temperature Channels - Siemens SINAMICS S120 Function Manual

Monitoring functions and protective functions
9.5 Thermal motor protection
9.5.7.3

Forming groups of temperature sensors

You can combine the temperature channels to form groups using parameter p4111[0...2].
For each group, the following calculated values are provided from the temperature actual
values (r4105[0...11]):
● Maximum: r4112[0...2], (index 0,1,2 = group 0,1,2)
● Minimum: r4113[0...2]
● Average value: r4114[0...2]
Example:
The temperature actual value from channels 0, 3, 7, and 9 should be combined in group 1:
● p4111[1].0 = 1
● p4111[1].3 = 1
● p4111[1].7 = 1
● p4111[1].9 = 1
The calculated values from group 1 are available in the following parameters for
interconnection:
● r4112[1] = maximum
● r4113[1] = minimum
● r4114[1] = average value
Note
Forming groups of temperature channels
Only form groups of continuously measuring temperature sensors. The switching
temperature sensors PTC and bimetallic NC contacts are only assigned two temperatures -
50° C and +250° C, depending on the state. Within a group with continuous temperature
actual values, the calculation of the maximum/minimum/average value temperature is
significantly falsified by taking into account switching temperature sensors.
9.5.7.4

Evaluating temperature channels

For each of the individual 12 temperature channels, an alarm threshold and a fault threshold
can be set in p4102[0...23]. The even parameter indices contain the alarm threshold and the
uneven parameter indices, the fault threshold. The temperature thresholds can be set
between -99°C and +251°C for each channel.
If the evaluation of the temperature actual value from p4105[0...11] exceeds the alarm
threshold set in p4102[0...23], then an alarm is output at r4104.0...23. Timer p4103[0...11] is
started at the same time.
If, after the timer has expired, the temperature actual value is still above the alarm threshold,
then an appropriate fault is output. This fault can be acknowledged as soon as the
temperature actual value is again below the alarm threshold.
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Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions