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Note
Forming groups of temperature channels
Only form groups of continuously measuring temperature sensors. Only the two
temperatures -50 °C and +250 °C are assigned to switching temperature sensors PTC and
bimetallic NC contact, depending on the switch status.
Within a group including continuously measuring temperature sensors, the calculated
maximum/minimum/mean values is significantly falsified by inclusion of switching
temperature sensors.
9.5.6.5
Evaluation of temperature channels
One alarm threshold and one fault threshold can be set for each of the 12 temperature
channels via p4102[0...23] (even parameter indices: warning 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], a hysteresis for the fault/alarm thresholds can be set in p4102[0...23] for
each channel.
The following applies to the warning thresholds:
● If the actual temperature value associated with a channel exceeds the specified warning
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 actual temperature value (r4105[x]) has reached or fallen
below the alarm threshold (p4102[2x]) - hysteresis (p4118[x]).
● If, after the timer has expired, the actual temperature value is still above the alarm
threshold, then the corresponding fault is output.
The following applies to the fault thresholds:
● If the actual temperature value associated with a channel exceeds the specified fault
threshold (r4105[x] > p4102[2x+1]), the corresponding fault is output.
● The fault remains until the actual temperature 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], a filter for smoothing the temperature signal can be activated for each
channel.
The time constant of the filter depends on the number of active temperature channels and
can be read off in r4120.
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: In the event of a failed sensor, the value 300 °C is output for the maximum
value, minimum value, and the mean value of the group.
Converter cabinet units
Operating Instructions, 11/2017, A5E36652151A
Functions, monitoring and protective functions
9.5 Monitoring functions and protective functions
687
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