Display And Export Of Daily Trends - Siemens SENTRON 7KN POWERCENTER 3000 Manual

5.4

Display and export of daily trends

Recording and exporting of daily trends
The recording of certain values of the connected devices can be activated in the
7KN Powercenter 3000.
Average values 1 of the devices can be used to track the trend of the respective measured
variable over a period of 24 hours at a cycle duration of 10 seconds.
Benefits:
The trend can be used as a basis for analyzing the development and thus the possible causes
of a fault.
It can be determined, for example, whether an overload trip has resulted from a slow rise or
a transient overload. Appropriate countermeasures can then be chosen.
• The variables measured (average values 1) every 10 seconds are stored for 24 hours.
• The archiving function for all variables measured every 10 seconds can be started via the
web user interface "Settings → General → Communication: Autostart archive service" and
tested via the "Service overview" toolbar.
• In the archive chart widget, it is possible to choose which value will be displayed and
exported.
• The 10-second values (= average values 1) are selected via the right point below the time
axis.
More than 8000 entries are provided for average values 1 in each case. With a 10-second
interval, this yields a period of 24 hours.
Note
Average values for the 7KN Powercenter 3000
• Average values 1, formed in a cycle of default 10 seconds, and
• Average values 2, formed in a cycle of default 900 seconds (= 15 minutes).
On many SENTRON devices, the cycle can be varied between 3 seconds and 31536000
seconds (= one year).
The 7KN Powercenter 3000 uses the cycle of the device that is really set for archiving,
provided that this set value can be read from the device.
On devices on which the cycle cannot be read, the 7KN Powercenter 3000 uses the
default setting for the cycle stated above.
• On devices that do not support average values, only the energy counters and, where they
are available, the universal counters are processed.
• On devices that have time keeping, the average values and energy values are provided
with the time stamp of the device. → Ensure that the devices are provided with the
correct time of day. See chapter Time synchronization (Page 88).
• For devices that do not have time keeping, the energy values are time-stamped with the
preceding 1/4-hour change on arrival in the 7KN Powercenter 3000.
7KN POWERCENTER 3000
Equipment Manual, 07/2020, L1V30579222003-03
5.4 Display and export of daily trends
Functions
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