TD_MRI1_06.05_GB
21
5.2.25 Blocking the protection functions
and assignment of the output
relays
Blocking the protection functions:
The blocking function of the
MRI1
can be set accord-
ing to requirement. By applying the aux. voltage to
D8/E8, the functions chosen by the user are blocked.
Setting of the parameter should be done as follows:
•
When pressing push buttons <ENTER> and <TRIP>
at the same time, message "BLOC" is displayed (i.e.
the respective function is blocked) or "NO_B"
(i.e. the respective function is not blocked). The LED
allocated to the first protection function I> lights red.
•
By pressing push buttons <+> <-> the value dis-
played can be changed.
•
The changed value is stored by pressing <ENTER>
and entering the password.
•
By pressing the <SELECT/RESET> push button, any
further protection function which can be blocked is
displayed.
•
Thereafter the blocking menu is left by pressing
<SELECT/RESET> again.
Function
Display LED/Colour
I> Overcurrent
(Low set)
NO_B I>
yellow
I>> Overcurrent
(High set)
BLOC I>>
yellow
I
E>
Earth current
1. element
NO_B I
E>
yellow
I
E>>
Earth current
2. element
NO_B I
E>>
yellow
tCBFPI
E>>
Switch failure
protection
NO_B
Table 5.2: Default settings of blocking functions
Assignment of the output relays:
Unit
MRI1
has five output relays. The fifth output relay
is provided as permanent alarm relay for self supervi-
sion is normally on. Output relays 1 - 4 are normally
off and can be assigned as alarm or tripping relays to
the current functions which can either be done by us-
ing the push buttons on the front plate or via serial in-
terface RS485. The assignment of the output relays is
similar to the setting of parameters, however, only in
the assignment mode. The assignment mode can be
reached only via the blocking mode.
By pressing push button <SELECT/RESET> in blocking
mode again, the assignment mode is selected.
The relays are assigned as follows: LEDs I>, I>>, I
E>
,
I
E>>
are two-coloured and light up
green
when the out-
put relays are assigned as
alarm relays
and
red
as
tripping relays
.
In addition, the LED
→←
also lights up with each ad-
justment. Green means advance and red reverse di-
rection.
Definition:
Alarm relays
are activated at pickup.
Tripping relays
are only activated after elapse of the
tripping delay.
After the assignment mode has been activated, first
LED I> lights up green. Now one or several of the four
output relays can be assigned to current element I> as
alarm relays. At the same time the selected alarm re-
lays for frequency element 1 are indicated on the dis-
play. Indication "1_ _ _" means that output relay 1 is
assigned to this current element. When the display
shows "_ _ _ _", no alarm relay is assigned to this cur-
rent element. The assignment of output relays 1 - 4 to
the current elements can be changed by pressing <+>
and <-> push buttons. The selected assignment can be
stored by pressing push button <ENTER> and subse-
quent input of the password. By pressing push button
<SELECT/RESET>, LED I> lights up red. The output re-
lays can now be assigned to this current element as
tripping relays.
Relays 1 - 4 are selected in the same way as de-
scribed before. By repeatedly pressing of the
<SELECT/RESET> push button and assignment of the
relays all elements can be assigned separately to the
relays. The assignment mode can be terminated at any
time by pressing the <SELECT/RESET> push button for
some time (abt. 3 s).
Note:
•
The function of jumper J2 described in general de-
scription "MR Digital Multifunctional Relays" has no
function. For relays without assignment mode this
jumper is used for parameter setting of alarm relays
(activation at pickup or tripping).
•
A form is attached to this description where the set-
ting requested by the customer can be filled-in. This
form is prepared for telefax transmission and can
be used for your own reference as well as for tele-
phone queries.
