24
TB MRIK3 12.00 E
5.7
Additional functions
5.7.1
Blocking the protection functions,
assignment of the output relays and
AR - functions
Blocking of the protective functions:
The
MRIK3
is equipped with a blocking function that
can be parameterized arbitrary. Connecting supply
voltage to terminals D8/E8 blocking of those functions
which were selected by the user takes place.
It is possible to choose between two types of protective
blocking:
1.
Blocking of the individual protection stages. The
excitation of the blocked protection stage is
blocked..
2.
Blocking of the individual tripping stages. The indi-
vidual protection stages are excited and the set
tripping time expires. Tripping only takes place
when:
a)
the voltage at the blocking input D8/E8 is re-
duced;
b)
the voltage at the blocking input D8/E8 is
applied, the tripping time and the blocking
time have expired. (refer to Chapter 5.4.16)
Parameter setting is to be carried out as follows:
•
After the <ENTER> and <TRIP> keys have been ac-
tuated simultaneously, the display shows the text
"PR_B" (the protection stages are blocked) or "TR_B"
(the tripping stages are blocked).
•
The settings can be changed by actuating the keys
<+> or <->. In this procedure, the LEDs I>; I>>;
IE>; IE>> are simultaneously alight in case of pro-
tective blocking "PR_B" and LEDs tI>; tI>>; tIE>,
tIE>> simultaneously emit light in case of trip block-
ing "TR_B".
•
Actuation of the <ENTER> key with a one-time en-
try of the password will store the set function.
•
After this actuate the <SELECT/RESET> key to call
up the first blockable protection function.
•
The display will show the text "BLOC" (the respec-
tive function is blocked) or "NO_B" (the respective
function is not blocked.
•
Actuation of the <ENTER> key will store the set
function.
•
By pressing the <SELECT/RESET> pushbutton, all
further protective function that can be blocked are
called one after the other.
•
After selection of the last blocking function renewed
pressing of the <SELECT/RESET> pushbutton
switches to the assignment mode of the output relays.
Function
Display
LED/Colour
I>
Overcurrent
(Low set)
NO_B
I> green
I>>
Overcurrent
(High set)
BLOC
I>> green
I
E>
Earth current
1. element
NO_B
I
E>
green
I
E>>
Earth current
2. element
NO_B
I
E>>
green
CBFP
Circuit breaker
failure protec.
NO_B
CB yellow
Table 5.2: Default settings for both parameter sets
Assignment of the output relays:
Unit
MRIK3
has five output relays. The fifth output relay,
provided as permanent alarm relay for self supervision
is normally on. Output relays 1 - 4 are normally off and
can be assigned as alarm or tripping relays to the cur-
rent functions which can either be done by using the
push buttons on the front plate or via serial interface
RS485. The assignment of the output relays is similar to
the setting of parameters, however, only in the
assign-
ment 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.
Definition:
Alarm relays
are activated at pickup.
Tripping relays
are only activated after elapse of the
tripping delay.
The relays are assigned as follows:
•
LEDs I>, I>>, I
E>
, I
E>>
are two-coloured and light up
green
when the output relays are assigned as
alarm
relays
and
red
as
tripping relays
.
•
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 relays for frequency element 1 are indicated
on the display.
•
Indication "1_ _ _" means that output relay 1 is as-
signed to this current element. When the display
shows "_ _ _ _", no alarm relay is assigned to this
current 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 subsequent input of the password.
