TB MRU3-1 12.00 E
11
5.3.4
Display of the activation storage
If after an activation the existing current drops again
below the pickup value, e.g. U<, without a trip has
been initiated, LED U< signals that an activation has
occured by flashing fast. The LED keeps flashing until it
is reset again (push button <RESET>). Flashing can be
suppressed when the parameter is set to NOFL.
5.3.5
Parameter switch/external
triggering for the fault recorder
By means of the parameter-change-over switches it is
possible to activate two different parameter sets.
Switching over of the parameter sets can either be
done by means of software or via the external inputs
RESET or blocking input. Alternatively, the external in-
puts can be used for Reset or blocking of the triggering
of the fault recorder.
Software-
parameter
Blocking input
used as
RESET input
used as
SET1
Blocking input
RESET input
SET2
Blocking input
RESET input
B_S2
Parameter switch RESET input
R_S2
Blocking input
Parameter switch
B_FR
External trigger-
ing of the fault
recorder
Reset input
R_FR
Blocking input
External trigger-
ing of the fault
recorder
S2_FR
Parameter switch External trigger-
ing of the fault
recorder
With the settings SET1 or SET2 the parameter set is
activated by software. Terminals C8/D8 and D8/E8
are then available as external reset input or blocking
input.
With the setting B_S2 the blocking input (D8, E8) is
used as parameter-set change-over switch. With the
setting R_S2 the reset input (D8, E8) is used as pa-
rameter-set change-over switch. With the setting B_FR
the fault recorder is activated immediately by using the
blocking input. On the front plate the LED FR will then
light up for the duration of the recording. With the set-
ting R_FR the fault recorder is activated via the reset
input.
With the setting S2_FR parameter set 2 can be acti-
vated via the blocking input and/or the fault recorder
via the reset input.
The relevant function is then activated by applying the
auxiliary voltage to one of the external inputs.
Important note:
When functioning as parameter change over facility,
the external input RESET is not available for resetting.
When using the external input BLOCKING the protec-
tion functions must be deactivated by software block-
ing separately (refer to chapter 5.9.1).
5.4
Protection parameters
5.4.1
1-phase or 3-phase U</U>-
tripping
Switching-over of the parameter permits selection be-
tween 1-phase and 3-phase tripping of the U</U>
steps.
Keys <+> or <-> are used to change the value and
<ENTER> to store it.
Note
When the
MRU3-1
is to be used for measuring the re-
sidual voltage in systems with isolated or compensated
neutral or as generator earth fault protection, the
measuring voltage has to be applied to terminals
A3-A4. Undervoltage functions U< and U<< have to
be set to "EXIT" and overvoltage functions U> and U>>
have to be adjusted to the required pickup values.
The frequency must be set to 50 or 60 Hz. The pa-
rameter 1-phase or 3-phase tripping mut be set to
U<>1 (1-phase tripping).
Содержание MRU3-1
Страница 1: ...MRU3 1 AC voltage relay...
