Seg MRD1-T, Manual

Page: 23 / 64

TB MRD1-T 10.01 E 23
5.1.5 VIEW mode / EDIT mode
There are two modes for selecting PARAMETER
pages:
A short press on the PARA-key activates the VIEW-
mode. The EDIT-mode can be selected by pressing
the PARA-key for approx. 2 s (long press).
•
VIEW mode (viewing)
On pressing the key this mode only allows viewing
the active parameters
•
EDIT mode (processing)
Unlike in mode VIEW, in EDIT mode one of the
four parameter sets can be selected. That parame-
ter set is then copied automatically into the EDIT
memory and can be viewed there. At the first at-
tempt of changing a parameter, the password is
requested. After entering the password (LED EDIT
lights up if the password was correct), the parame-
ter can be changed. For any further change of pa-
rameter(s) the password is not requested again. In
case the user does not know the password, the
password entering mode can be cancelled and
still parameter sets be viewed but as explained
above, they cannot be changed.
It is not necessary to acknowledge any change
separately by pressing the ENTER key since at first
everything is processed in the EDIT memory only.
Each of the changes can be cancelled again. LED
MODIFIED indicates that the parameter displayed
was changed. If it should be set back to the initial
value, only brief actuation of key RESET (cancel
function) is needed. If the process is closed (with:
ENTER, long), all the changes can be rejected
again or be accepted. (Checkback: ARE YOU
SURE?). Before the parameter set ist finally stored
an internal plausibility check is performed to ensure
that all settings are conclusive. If the check routine
detects a irresolute combination of settings, the
user will be informed and the settings are not
stored. e.g. an unsuitable combination of trans-
former rated current (which is calculated from rated
voltage and power capacity setting) an the setted
CT primary rated current.
The protection program executed in the MRD1 at the
time is not effected by this procedure. Values of the
active parameter sets filed in the PARAMETER mem-
ory are still being used until the complete EDIT mem-
ory is recopied into the respective PARAMETER
memory. Only then all changes made taking effect
together in the protection program.
!
Note
Note Note
Note
If during processing the aux. voltage fails, the com-
plete EDIT memory is erased. After aux. voltage has
returned, the protection program starts with those set-
tings which were stored in the PARAMETER memory
before the last processing operations. By this it is en-
sured that the protection program does not work with
incompletely changed data or meaningless data.
If due to the continously running check-sum test data
error or loss of parameter memory is noted during
start-up of the relay or during operation, a default
parameter is loaded automatically. In such case the
relay changes to the Offline mode (see next chapter)
and the self-supervision relay de-energizes.
The EDIT-mode is left automatically if there is no input
longer than 10 minutes (time out). Changed parame-
ters wil not be stored.