Seg HighTECH MRU3-2, Руководство пользователя

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16 TB MRU3-2 12.00 E
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 set change-over
switch/external trigger for the
fault recorder
By means of the parameter-change-over switches it is
possible to activate two different parameter sets. Swit-
ching 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 inputs 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 Externe Trig-
gerung des Stör-
schreibers Reset input
R_FR Blocking input External trigger-
ing for the fault
recorder
S2_FR Parameter switch External trigger-
ing for 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 para-
meter-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 activa-
ted 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
MRU3-2
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).