Instruments Mode; Hidden Instruments; Fault Data Mode; Default Instruments Screens - Siemens 7SG12 DAD-N Manual

through the available setting values or, pressing ►TEST/RESET moves right through the edit fields. Note
that all settings can be incremented or decremented using the ▲ READ UP or ▼  READ DOWN keys and
they all wraparound so that to go from a setting minimum value to the maximum value it is quicker to press
the ▼  READ DOWN key, rather than scroll through every setting. Also, to facilitate quicker setting changes
an acceleration feature is available which if ▲  READ UP or ▼  READ DOWN are depressed and held,
then the rate of scrolling through the setting values increases.
If ESCAPE/CANCEL is pressed during a setting change operation the original setting value is restored and
the display is returned to the normal view mode.
If changes are made to the setting value then pressing ENTER disables the flashing character mode and
displays the new setting value. This is immediately stored in non-volatile memory.
The next sections give a description of each setting in the relay. The actual setting ranges and default
values can be found in the Relay Settings section of this manual.

5.7 Instruments Mode

In INSTRUMENT MODE metering points can be displayed to aid with commissioning, the following meters
are available
Instrument
[ DIFF METERS
--> press down <--
Primary Currents
0.000 0.000 0.000 kA
Secondary Currents
0.000 0.000 0.000 A
Nominal Currents
0.00 0.00 0.00 xIn
[ MISC METERS
--> press down <--
Status Inputs 1-16
---- ---- ---- ----
Status Inputs 17-27
---
Output Relays 1-16
---- ---- ---- ----
Output Relays 17-29
---- -
Time & Date
13/08/2002 10:16:11
1) Display is different when fewer status inputs are fitted
2) Display is different when fewer output relays are fitted
Note that meters not designated as primary or secondary values are usually displayed as multiples of
nominal
i.e. x In, 1 Amp or 5 Amp.

5.7.1 Hidden Instruments

At the "INSTRUMENTS MODE" title screen, pressing ENTER and DOWN simultaneously reveals some
additional metering for calibration purposes. The reference channels as well as DC offsets may be
displayed along with the RMS values in raw ADC counts. The relationship between current and ADC
counts is 1 x In = 600 counts.

5.8 Fault Data Mode

In "FAULT DATA MODE", the time and date of relay operations are recorded together with a record of the
LED flag states.

5.9 Default Instruments Screens

The menu presentation of the various instruments allows the user to view a single screen at a time.
However, for in service use, it is desirable that a small number of high interest, user selectable screens are
presented automatically by default without user intervention. The instrument screens of interest to the user
e.g. those required to be presented to a visiting engineer for record purposes can be selected by the user
©2010 Siemens Protection Devices Limited
Description
] Start of Differential current meters
Differential Primary currents
Differential Secondary currents
Differential Nominal currents
] Start of miscellaneous meters
Displays the state of DC status inputs 1 to 16
Displays the state of DC status inputs 17 to 27
1
Displays the state of output relays 1 to 16
Displays the state of output relays 17 to 29
Time and Date
7SG12 DAD N Description of Operation
1
2
2
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