20
TB MRI(K)3-C 03.02 E
4.7
Control functions
4.7.1 Introduction
The controlling of the conected circuit breaker take
place by the means of the output relays. The CB posi-
tion as well as the CB ready message are supervise
by digital inputs.. The status of the CB and the position
are indicated by on LED on the front plate of the relay
MRI(K)3-C. The local operation take place by the
maens of the push buttoms on the front plate. Further-
more the position of the CB are signalize to a scada
system via the serial interface and Modbsu RTU proto-
col.
4.7.2 Interlocking / Password for control
mode
The local operation of the CB is protected via a sepa-
rate password. The standard setting of this password
is four times minus (‘ - - - - ‘).The password can be
changed as described in Chapter 4.4 of the of the
description "MR – general" and via the jumper J2.
During local operation all remote operation via digital
inputs or serial interface are blocked.
To change from local to remote or back are only pos-
sible from the front plate of the relay.
4.7.3 Operating assignment of C.B. control
In case of local operation, remote mode via the digital
inputs or via the serial interface is no longer possible.
Switching-over between local operation (LCAL on the
display) and remote mode (RMOT on the display) can
only be done via the front plate.
Display shows “LCAL”
The digital input functions:
t0 = Ext. tripping immediately
t1 = Ext. tripping delayed
ON = Ext. start
t2 = Trip/restore function
are blocked (see chapter 5.11.5)
Switching on and off via the serial interface are also
blocked.
Display
Display
Display
Display
„RMOT“
Switching on and off function via the front panel is
blocked.
4.7.4 Changing the operating assignment
Changing the operating assignment requires the fol-
lowing procedure:
Simultaneous operation of the keys <ENTER> and
<+> will take you to the control mode. The display
shows “LCAL” or “RMOT”. If the function is to be main-
tained, you can move to the next menu item with the
<SELECT/RESET> key. The function can be changed
with either the <+> or the <-> key.
4.7.5 Saving the operating assignment
If the changed function is to be saved, the <ENTER>
key must be operated. The display shows “SAV?”. If
the <ENTER> key is pressed again, you are asked for
the password. The display shows ”PSW?”. Pressing
the next four keys will enter the password. On the dis-
play the entry is accompanied by an “X” for every en-
tered character. The standard password for the control
functions is 4x <->. If the password has been entered
correctly, the display will show “SAV”. Now the
<ENTER> key must be pressed again and kept de-
pressed (3s) until the function to be set reappears in
the display. If the entry is incorrect, the password is
requested again. The display will show “PSW?” once
more. A detailed description of entering and changing
the password is provided in the description MR – gen-
eral in Chapter 4.4 and in this description in Chapter
3.2.
4.7.6 Remote switching on and off of
the C.B.
If the operating assignment of the C.B. control was set
to remote (RMOT), the C.B. control via the front panel
is blocked. By operating the <SELECT/RESET> key
you will leave the operating assignment again. The
display will show “|SEG”.
The digital input functions:
t0 = Ext. tripping immediately
t1 = Ext. tripping delayed
ON = Ext. start
t2 = Trip/restore Function
are released.
Switching on and off via the serial interface are also
released.