Evaluating Temperature Channels - Siemens SINAMICS G150 Operating Instructions Manual

Note
Forming groups of temperature channels
Only form groups of continuously measuring temperature sensors. Depending on the status,
the switching temperature sensors PTC and bimetal NC contacts are only assigned two
temperatures - 50 °C and +250 °C.
Within a group with continuously measuring temperature sensors, the calculation of the
maximum/minimum/average values, is significantly falsified when taking into account
switching temperature sensors.
9.4.6.5

Evaluating temperature channels

For each of the individual 12 temperature channels, using p4102[0...23] an alarm threshold
and a fault threshold can be set (straight parameter indices: Alarm thresholds, odd
parameter indices: Fault thresholds). The temperature thresholds can be set for each
channel from -99 °C to +251 °C. For p4102[0...23] = 251, the evaluation of the corresponding
threshold is deactivated.
Using p4118[0...11], for each channel a hysteresis for the fault/alarm thresholds can be set
in p4102[0...23].
The following applies for the alarm thresholds:
● If the temperature actual value associated with a channel exceeds the set alarm threshold
(r4105[x] > p4102[2x]), the corresponding alarm is output. Timer p4103[0...11] is started
at the same time.
● The alarm remains until the temperature actual value (r4105[x]) has reached or fallen
below the alarm threshold (p4102 [2x]) - hysteresis (p4118 [x]).
● If, after the timer has expired, the temperature actual value is still above the alarm
threshold, then the appropriate fault is output.
The following applies for the fault thresholds:
● If the temperature actual value associated with a channel exceeds the set fault threshold
(r4105[x] > p4102[2x+1]), the corresponding fault is output.
● The fault remains until the temperature actual value (r4105[x]) has reached or fallen
below the fault threshold (p4102 [2x+1]) - hysteresis (p4118 [x]) and the fault has been
acknowledged.
Using p4119[0...11], for each channel, a filter can be activated to smooth the temperature
signal.
The time constant of the filter depends on the number of active temperature channels and
can be read in r4120.
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A
Functions, monitoring, and protective functions
9.4 Monitoring and protective functions
591