TB MRU3-1 12.00 E
15
5.9
Additional functions
5.9.1
Setting procedure for blocking the
protection functions
The blocking function of the
MRU3-1
can be set ac-
cording 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 allo-
cated to the first protection function U< 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 menu is left by pressing
<SELECT/RESET> again.
•
If the <SELECT/RESET> key is actuated again, the
blocking menu is left and the assignment mode is
accessed.
Function
Description
Display LED
U<
Undervoltage step 1 BLOC
green
U<<
Undervoltage step 2 BLOC
green
U>
Overvoltage step 1
NO_B
green
U>>
Overvoltage step 2
NO_B
green
Table 5.4: Blocking function for two parameter sets
Assignment of the output relays:
Unit
MRU3-1
has five output relays. The fifth output re-
lay is provided as permanent alarm relay for self su-
pervision is normally on. Output relays 1 - 4 are nor-
mally off and can be assigned as alarm or tripping re-
lays to the voltage functions which can either be done
by using the push buttons on the front plate or via se-
rial interface RS485. The assignment of the output re-
lays 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 U<, U<<, U>
and U>> are two-coloured and light up
green
when
the output relays are assigned as
alarm relays
and t
U<
,
t
U<<
, t
U>
, t
U>>
,
red
as
tripping relays
.
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 U< lights up green. Now one or several of the
four output relays can be assigned to under voltage
element U< as alarm relays. At the same time the se-
lected alarm relays for under voltage element 1 are
indicated on the display. Indication "1_ _ _" means
that output relay 1 is assigned to this under voltage
element. When the display shows "_ _ _ _", no alarm
relay is assigned to this under voltage element. The as-
signment of output relays 1 - 4 to the current elements
can be changed by pressing <+> and <-> push but-
tons. The selected assignment can be stored by press-
ing push button <ENTER> and subsequent input of the
password. By pressing push button <SELECT/RESET>,
LED U< lights up red. The output relays can now be
assigned to this voltage 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" does
not apply for
MRU3-1
. For relays without assign-
ment 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 setting
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 telephone queries.
Содержание MRU3-1
Страница 1: ...MRU3 1 AC voltage relay...
