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2 Functions
2.1.2
Device
The device requires some general information. This may be, for example, the type of
indication to be issued in the event a power system fault occurs.
2.1.2.1
Trip Dependent Indications
The recording of indications masked to local LEDs, and the maintenance of spontane-
ous indications, can be made dependent on whether the device has issued a trip
signal. This information is then not output if during a system disturbance one or more
protection functions have picked up, but no tripping by the 7ST6 resulted because the
fault was cleared by a different device (e.g. on another line). These indications are
then limited to faults in the line to be protected.
The figure below illustrates the creation of the reset command for stored indications.
When the relay drops out, stationary conditions (fault display Target on PU / Target on
TRIP; Trip / No Trip) decide whether the new fault will be stored or reset.
Figure 2-1
2.1.2.2
Spontaneous Indications on the Display
You can determine whether or not the most important data of a fault event is displayed
automatically after the fault has occurred (see also „Fault indications" in Section 2.19.1
„Auxiliary Functions").
2.1.2.3
Setting Notes
Fault Indications
Pickup of a new protective function generally turns off any previously lit LEDs, so that
only the latest fault is displayed at any time. It can be selected whether the stored LED
displays and the spontaneous indications on the display appear upon renewed pickup,
or only after a renewed trip signal is issued. In order to enter the desired type of dis-
play, select the submenu Device in the SETTINGS menu. At address 610
FltDisp.LED/LCD the two alternatives Target on PU and Target on TRIP („No
trip - no flag") are offered.
For devices with graphical display use parameter 615 Spont. FltDisp. to specify
whether or not a spontaneous indication will appear automatically on the display (YES)
or not (NO). For devices with text display such indications will appear after a system
fault by any means.
You can set at address 620 T Backlight on how long the display backlight will
remain on after an entry on the integrated keypad.
30
Creation of the reset command for the memory of LED and LCD displays
7ST6 Manual
E50417-G1176-C251-A3
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