CET Electric Technology
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4.3.16 RMS Change Detection
The PMC-690 is capable of detecting Voltage and Current RMS Change which can help monitoring
parameter changes and quick response to improve maintenance. RMS Changes are stored as events in
the SOE Log.
The RMS Change Detection can be programmed via the Front Panel or through communications and
have the following setup parameters:
Setup Parameter
Definition
Options/Default*
Voltage Enable
Specify if Voltage RMS Change detection is enabled.
Disabled */ Enabled
Voltage Threshold
Specify the range that Voltage must exceed for the Voltage RMS
Change would be detected.
0~999,999,999 (x0.01V)
Default=1000
Current Enable
Specify if Current RMS Change detection is enabled.
Disabled */ Enabled
Current Threshold
De Specify fines the range that current must exceed for the Current
RMS Change would be detected.
0~999,999,999 (x0.01A)
Default=100
RMS Change Trigger
Specify what action can take when the RMS Change is detected.
WFR
Table 4-20 RMS Change Setup Parameters
Bit
Action
Bit0~Bit26
Reserved
Bit27
DWR
Bit28
WFR
Bit29
RMS Recorder
Bit30~Bit31
Reserved
Table 4-21 RMS Change Triggers
4.4 Data Logging
4.4.1 Device Log and SOE Log
The PMC-690’s
Device Log
and
SOE Log
can store up to 1024 events in its non-volatile memory. The
Device Log
consists of such events as power-on, power-off, sites management and setup changes for
the device, as well as system operations, while
SOE Log
consists of setpoints, WFR and RMS Recorder
Dip/Swell, Transient, Inrush Current, Rapid Voltage Changes and Mains Signaling Voltages for
monitoring sites. For detailed event and log description, please refer to
Appendix B
. Each event record
includes the event classification, its relevant parameter values and a timestamp in 1ms resolution.
All events can be retrieved via communications. If there are more than 1024 events, the newest event
will replace the oldest event on a FIFO basis.
4.4.2 Statistical Data Recorder (SDR)
The PMC-690 provides a comprehensive
SDR
for IEC 61000-4-30 parameters that is un-matched by
other PQ devices. The
SDR
records the Min., Max., Avg. (also known as Demand) and CP95 for each
parameter. There are 5
SDR
s
of 64 parameters each that can be individually programmed to record
different parameters at different time intervals, which may vary from 1 to 60 minutes. The PMC-690 can
retain the SDR Logs for 450 days when the recording interval is set to 15 minutes. The recorded data is
stored in non-volatile memory and will not suffer any loss in the event of a power failure. If storage is
full, the newest log will replace the oldest on a first-in-first-out basis.
The programming of the
SDR
is only supported over communications. Each SDR provides the following
setup parameters:
Setup Parameters
Value/Option
Default
Recording Interval
1 to 60 minutes, (0 = inactive)
3
Recording Mode
0=Stop-When-Full / 1=First-In-First-Out
1
Содержание PMC-690
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Страница 21: ...CET Electric Technology 21 Energy Demand Harmonics Spectrum Table Power...
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