Siemens 7SK80 - Notes on Device Operation; Different Operation

Functions
2.22 Notes on Device Operation
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
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2.22 Notes on Device Operation
The operation of the 7SK80 slightly differs from the other SIPROTEC 4 devices. These differences are de-
scribed in the following. General information regarding the operation and configuration of SIPROTEC 4 devices
is set out in the SIPROTEC 4 System Description.
2.22.1 Different operation
Pushbuttons of the Control Panels
Entry of Negative Signs
Only a few parameters can reach a negative value, i.e. a negative sign can only be entered for these.
If a negative sign is permissible, the prompt -/+ --> v/^ appears in the bottom line when changing the parameter.
The sign can be determined via the scrolling keys: downward = negative sign, upward = positive sign.
Display
The SIPROTEC 4 System Description applies to devices with a 4-line ASCII display. Apart from that there are
devices with a graphical display and a size of 30 lines. The 7SK80 uses the outputs of the graphical display,
but with 6 lines. Therefore, the representation might differ from the representations in the System Description.
The basic differences of the device with regard to the representation are the following:
The current selection is indicated by inverse representation (not by the prefix >)
Figure 2-108 Inverse representation of the current selection
Pushbutton Function/meaning
Confirming entries and navigating forward in the menus
Navigating to the main menu (where necessary, press repeatedly),
navigating backwards in the menus,
discarding entries
Testing the LEDs
Resetting the LED memory and binary outputs
Function key Fn for displaying the assignment of the function keys. If several
function keys have been assigned, a second page is displayed for the assign-
ment when leafing through, if required.
Combined pushbutton with numeric keys for a faster navigation (e.g. Fn + 1 op-
erational messages)
Navigation to the main menu with Fn in combination with the numeric key 0.
For setting the contrast, keep the pushbutton pressed for about 5 seconds. Set
the contrast in the menu with the scrolling keys (downward: less contrast,
upward: more contrast).