Disk Activity Warning; Metering - Siemens 7SR12 Argus Manual

7SR11 & 7SR12 Description Of Operation
Setting either the Export Power (W) or Lag VAr (VAr) to be -ve, will reverse the Direction of the Energy transfer
for these quantities. So forward VAr will then be reported as Imported Reactive Energy, and forward Watts will be
reported as Exported Active Energy.
When the accumulated Energy quantities reach a set increment, the Relay issues a pulse to the binary outputs:
OUTPUT CONFIG/OUTPUT MATRIX> Active Exp Pulse, Active Imp Pulse, Reactive Exp Pulse and Reactive
Imp Pulse.
The Energy increments are set by the settings: DATA STORAGE/ENERGY STORAGE> Active Exp Energy
Unit, Active Imp Energy Unit, Reactive Exp Energy Unit and Reactive Imp Energy Unit. These setting also
define the resolution of the stored energy values reported by instruments and communications protocols. The
value is stored in the range 0-999999 which continues from zero automatically when 999999 is reached.
6.5.7 D A
ISK CTIVITY
The Data Storage facilities offered by the Relay involve archiving a huge amount of data to non-volatile memory.
Since such functionality is always secondary to the Protection functionality offered by the Relay, this means that
data transfers can take significant amounts of time; perhaps several minutes. If the Relay is power-cycled during
a storage cycle, some of the data will be lost. For this reason, the Relay can provide a visual warning (at the top-
right position of the LCD) that data storage is taking place:
The 'œ' disk symbol shows that the copying of Events, Waveform Records or Fault Records, to non volatile
disk storage, is currently in progress.
Whether this symbol is displayed or not is set by the SYS CONFIG > Disk Activity Symbol setting.
The 'A' symbol at the top-right position of the LCD indicates that new Events, Waveform Records or Fault
Records are currently being held in volatile RAM and the archiving, to non-volatile flash disk storage, is being
temporarily blocked.

6.6 Metering

The metering feature provides real-time data available from the relay fascia in the 'Instruments Mode' or via the
data communications interface.
The Primary values are calculated using the CT and VT ratios set in the CT/VT Config menu.
The text displayed in the relays 'Instruments Mode' associated with each value can be changed from the default
text using the Reydisp software tool.
The user can add the meters that are most commonly viewed to a 'Favourites' window by pressing 'ENTER' key
when viewing a meter.
Config/Favourite Meters Timer menu.
The energy storage meters can be reset from a binary input and have a user selectable setting for their
measurement in the Data Storage/Energy storage menu.
For a detailed description refer to Technical Manual Chapter 2 – Settings and Instruments.
Chapter 1 Page 84 of 88
W
ARNING
The relay will scroll through these meters at an interval set in the System
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