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1 User Information
The uncertainty of operational measurements of the measurands is defined as per IEC 62586-1 product
standard, class S (leading standard), the IEC 61000-4-30 power quality standard, and the IEC 61557-12
standard.
For detailed information on measurands and measurements, see Chapter 4.2 and the technical data in
Chapter 13.1.
Functionality of the Recorders in SICAM P850
The recorders are capable of recording both measurands and events in parameterizable time intervals. The
following recorder types are used in SICAM P850:
•
Measurement recorder: recording parameterized periods, for example, 10-second frequency, aggregation
of current, power etc.
•
Fault recorder: Recording of sampled values of voltage and current using programmable triggers.
The device features a 2-GB memory for storing the recorder data.
Functionality of the Recorders in SICAM P855
The recorders are capable of recording both measurands and events in parameterizable time intervals. The
following recorder types are used in SICAM P855:
•
Measurement recorder: recording of PQ measurands (acc. to IEC 61000-4-30) and non-PQ measurands
over parameterized periods, for example, 10-second frequency, aggregation of voltage, current, power
etc.
•
Trend recorder: long-term recording and monitoring of the voltage change history over a parameterized
period of time in programmable tolerance ranges; 1/2 RMS values
•
Fault recorder: Recording of sampled values of voltage and current using programmable triggers.
•
Event recorder: recording of voltage events, frequency events, and voltage unbalance events
The device features a 2-GB memory for storing the recorder data.
Communication
To communicate with the systems control and other process automation equipment, the device features an
Ethernet interface and optionally an RS485 interface.
Ethernet supports the device parameterization, the transmission of measured data, counter values and
indications/events, and the time synchronization via NTP. The communication protocols are HTTP,
Modbus TCP and IEC 61850.
The RS485 interface supports the transmission of the measured data, counter values and indications, and the
time synchronization. Depending on the device version, you can use either the Modbus RTU or the
IEC 60870-5-103 communication protocol.
Time Synchronization
During operation SICAM P850/P855 needs the date and time for all time-relevant processes. This ensures that
a common time basis exists when communicating with peripheral devices and enables time stamping of the
process data. The following types of time synchronization can be executed:
•
External time synchronization via Ethernet NTP (preferred)
•
External time synchronization via fieldbus using the Modbus RTU or the IEC 60870-5-103 communication
protocol
•
Internal time synchronization via RTC (if external time synchronization is not available)
Parameterization
Parameters are set using an internal Web browser with HTML pages from the connected PC or notebook.
Internet Explorer 6 (or higher) is required for this purpose. Devices featuring a display offer a limited
parameterization function using the front softkeys.
16
SICAM P850/P855, 7KG85xx, Device Manual
E50417-H1040-C482-A6, Edition 10.2018
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