Functions, monitoring, and protective functions
9.4 Monitoring and protective functions
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A
591
Note
Forming groups of temperature channels
Only form groups of continuously measuring temperature sensors. Depending on the status,
the switching temperature s
ensors PTC and bimetal NC contacts are only assigned two
- 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 a
ccount
switching temperature sensors.
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.
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