P341/EN O/B11 Operation Guide
CHAPTER 1 Introduction
Page 14/22 MiCOM P341
Note: *May vary according to relay type/model
Press clear to
reset alarms
To clear all alarm messages press ; to return to the alarms/faults present display
and leave the alarms uncleared, press
. Depending on the password
configuration settings, it may be necessary to enter a password before the alarm
messages can be cleared (see section on password entry). When the alarms have
been cleared the yellow alarm LED will extinguish, as will the red trip LED if it was
illuminated following a trip.
Alternatively it is possible to accelerate the procedure, once the alarm viewer has
been entered using the
key, the key can be pressed, this will move the display
straight to the fault record. Pressing
again will move straight to the alarm reset
prompt where pressing
once more will clear all alarms.
3.6.5 Setting changes
To change the value of a setting, first navigate the menu to display the relevant cell.
To change the cell value press the enter key
#, which will bring up a flashing cursor
on the LCD to indicate that the value can be changed. This will only happen if the
appropriate password has been entered, otherwise the prompt to enter a password
will appear. The setting value can then be changed by pressing the 6 keys. If the
setting to be changed is a binary value or a text string, the required bit or character to
be changed must first be selected using the /and 6 keys. When the desired new
value has been reached it is confirmed as the new setting value by pressing
#. Alternatively, the new value will be discarded either if the clear button is
pressed or if the menu time-out occurs.
For protection group settings and disturbance recorder settings, the changes must be
confirmed before they are used by the relay. To do this, when all required changes
have been entered, return to the column heading level and press the key. Prior to
returning to the default display the following prompt will be given:
Update settings?
Enter or clear
Pressing # will result in the new settings being adopted, pressing will cause the
relay to discard the newly entered values. It should be noted that, the setting values
will also be discarded if the menu time out occurs before the setting changes have
been confirmed. Control and support settings will be updated immediately after they
are entered, without ‘Update settings?’ prompt.
3.7 Front communication port user interface
The front communication port is provided by a 9-pin female D-type connector located
under the bottom hinged cover. It provides RS232 serial data communication and is
intended for use with a PC locally to the relay (up to 15m distance) as shown in
Figure 5. This port supports the Courier communication protocol only. Courier is the
communication language developed by ALSTOM T&D Protection & Control to allow
communication with its range of protection relays. The front port is particularly
designed for use with the relay settings program MiCOM S1 which is a Windows NT
based software package.
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