Siemens SINAMICS S150 NEMA, Operating Instructions Manual

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Functions, monitoring and protective functions
9.5 Monitoring functions and protective functions
Enclosed Drives
Operating Instructions, 12/2018, A5E36652151A
715
Failure of a sensor within a group
The response to the failure of a temperature sensor within a group can be set with parameter
p4117[0...2]:
● p4117[x] = 0: The failed sensor is not taken into account in the group.
● p4117[x] = 1: When a sensor fails, for the maximum value, minimum value and the
average value of the group, a value of -508 °F (-300 °C) is output.
Smoothing time for temperature channels
For long or unshielded temperature cables, interference can cause the TM150 to respond
and incorrectly shut down the drive. To avoid this, you can set an individual smoothing time
for every temperature channel in the TM150 for the respective temperature signal.
The smoothing is realized using a 1st order lowpass filter. The effective smoothing time
constant depends on the number of simultaneously active temperature channels, and is
indicated in parameter r4120 [0...11].
The smoothing time constant to be set is calculated using the following formula:
Smoothing time constant (p4122) ≥ 2 x active number of channels x 50 ms
Setting the smoothing time (using an example for sensor 5)
● Activate the smoothing time: p4119[5] = 1.
● Enter the smoothing time constant: p4122[5] = 1.
You can determine the smoothing time constants using the above mentioned formula. To
do this, you have to know for how many temperature channels you wish to configure a
smoothing time. The implemented smoothing time is displayed after the entry in p4122 for
the selected temperature channel (r4120[0...11]).
9.5.6.6 Function diagrams
FP 9625 TM150 - temperature evaluation structure (channel 0 ... 11)
FP 9626 TM150 - temperature evaluation 1x2, 3, 4-wire (channel 0 ... 5)
FP 9627 TM150 - temperature evaluation 2x2-wire (channel 0 ... 11)