21/07/2010
10
MRAR 01/96 C
4.2.4 Push buttons
The front panel contains five push buttons used for setting, measuring and other user functions.
The individual setting and measuring values can be selected in turn by pressing the
<SELECT> /
<RESET>
push button. This button also resets the relay if pressed for approximately 3 seconds.
The
<UP>
and
<DOWN>
push buttons are for incrementing and decrementing any selected parameter.
Continuous pressing of these push buttons will cause the parameter to change at an increased rate.
The
<ENTER>
push button is used to transfer the indicated value to the internal parameter memory. An
unintended or unauthorised change of the selected parameter can be avoided through the password
protection facility.
The
<TRIP>
push button is used to test the output relay circuits, both for tripping and signalling. This
operation is also password protected.
4.3 Code jumpers
Behind the front panel of the
MRAR
are three code jumpers used to preset the following functions:
•
•
•
•
Password programming
•
•
•
•
Alarm and Trip relay functions
The following figure shows the position and designation of the code jumpers
J3
J2
J1
Code Jumper ON
Code Jumper OFF
Front Board
Code Jumper
