Siemens SICAM 7KG85X, Manual, Page: 104 / 281

Historical Load-Profile Data
The device records the following measurands:
Table 5-1 Historical Load-Profile Data
Measurement Cumulated Power
Values Arithmetic Average
Power Values Maximum Values Minimum Values
P
Import
x x ±x ±x
P
Export
x x
Q
Import
x x ±x ±x
Q
Export
x x
S x x x x
Storage of Load-Profile Data
The load-profile data are stored in a ring buffer with up to 4000 datasets. If the ring buffer is full every new
dataset overwrites the oldest dataset. Every dataset contains the average power values, minimum/maximum
values, a time stamp, and status information for a completed subperiod.
The traceability of the load profile depends on the length of the subperiod:
•
Fixed-block method: length of the measuring period = 15 min
•
Rolling-block method: length of the subperiod = 15 min
On the condition that all periods correspond to the configured period length, the recording period is longer
than 40 days.
Current Load-Profile Data at the Communication Interfaces and on the Web Pages
The load-profile data of the current and last completed periods are output at the communication interfaces.
For information on the data transmission via the communication protocols Modbus TCP, Modbus RTU, and
IEC 61850, refer to the Communication manual.
On the Web pages, the load-profile data are displayed in the tab Value view→ Load profile.
Types of Synchronization
At the beginning of every subperiod, the device expects a synchronization signal which can either be supplied
externally or created internally.
External supply of the synchronization signal:
•
Via the communication interfaces
Creation of the internal synchronization signal:
•
Creation through the internal clock of the device
Synchronization with External Synchronization Pulses
Synchronization via communication interface
The device checks whether there is a deviation from the set time or whether there are no synchronization
pulses. If a set tolerance is exceeded or if the value falls below this tolerance, the measuring period is short-
ened and marked accordingly.
If the time grid of the incoming pulses is shifted, the device adapts to the changed time grid automatically.
Particularities in the synchronization via communication interface
The synchronization telegram transmitted via Modbus TCP or Modbus RTU contains, among other things, the
length of the subperiods in minutes.
If the set length of the subperiods in the device does not correspond to the length in the telegram, the
synchronization pulse is ignored. Load-profile data are still recorded though based on the internal clock of the
device.
Energy Management
5.1 Load Profile
SICAM, SICAM P850/P855 7KG85X, Manual 103
E50417-H1040-C482-A9, Edition 03.2022