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Breaker Display Unit
Alarm
Log Cause and Parameters Displayed
Alarm
Cause
Message
Associated
Measured
Parameters
Overcurrent
Over Ground Current
Over Neutral Current
Current
Unbaiance
OVER
I
OVER
lg
OVER
In
I
UNBAL
la,
lO,
lc, and
il
option
present
lg,
ln
Communications
Command
REIV]OTE
OPENED
or
CLOSED
Over Voltage
Undervoltage
Voltage Unbalance
OVER V
UNDER
V
V UNBAL
Vab,
VOc,
Vca,
V*;i:
Reverse Power
Over Power
FEVRS
KW
OVER
KW
Over kW Demand
OVER
KWT)
KWD
Over kVA
OVER
KVA
Over
kVAR
OVEB
KQ
KQ
Over/Under
PF
PWR FCTR
PF
Over Frequency
Under Frequency
OVER
Hz
UNDER Hz
Hz
Trip
Log Cause and Parameters Displayed
Trip Cause
Message
Associated
Measured
Parameters
Overload
Short Time
I
nstantaneous
Ground
Fault
OVERLOAD
SHORT
SHORT
GROUND
la. lb, lc, and
if
option
present
lg,
ln
Shadow
SHADOW
Current
Unbalance-
I
UNBAL
Communications Command
REMOTE
Over Voltage*
Under
Voltage.
Vo
tage Unbalance-
OVER V
UNDER
V
V UNBAL
Vab, Vbc
VCa,
V*)K
Reverse Power*
REVRS
KW
KW, KVA.
KQ
Over
Frequency.
Under Frequency
OVER
Hz
UNDER
Hz
Hz, Vab, Vbc
Vca,
Vx*
lf
the BDU
is
connected
to the
trip
unit
when the alarm relay
is
activated,
the event
ls
immediately displayed.
The
"ALRM
LOG"
flashes
on
and
off several
times at 1-second
intervals.
The BDU
then automatically
starts
displaying the cause
and
associated measured
parameters. This
sequence
of flashing
ALRN4
LOG
and displaying
alarm log values
continues
until
any key is pressed, returning the display
to
manual
control.
Note
that the alarm log has
not
been erased when returning to
manual control and can again
be
read
by
manually scrolling to
the "ALRM LOG"
window
Reading
the
Trip
Log
-
From
the
"TRIP
LOG" window,
the
most recent
trip
log event can be read by pressing
Read
to
display the cause of the trip, followed by
Read
(or
Down) to
display
the
associated
measured parameters,
The
display
will
return
to
the
"fRlP
LOG"
window when the
Read (or
Down) key
is
pressed
after
the
last
parameter
is
displayed,
Pressing
Down
or
Up
f
rom
the
'TRIP
LOG" window scrolls the display to
the next
window
in
the
sequence.
The cause
and
associated
measured parameters
displayed are given in the
following
table, The
message "No Log" will be displayed
if
there
is
no
tripping
information available from the
trip
unit.
Read
Read
Read (or Down)
Reading the Trip
Log
Note:
'
indicates "X'
option
tripping
functions
lf
the BDU
is
connected
to
the
trip
unit
when
the
circuit
breaker
is
tripped,
the
event
is
immediately displayed,
The "TRIP LOG
flasheson
and
off
severaltimesat
1-second intervals.
The BDU
then automatically starts
displaying
the
cause and associated
measured parameters. This sequence
of
f
lashing
"TRIP
LOG"
and displaying alarm log
values continues until
the
circuit
breaker
is
closed
or until any key
is
pressed. Closing
the
circuit
breaker restarts the automatic data
scrolling
through the real-
time measured values; pressing a key
returns
the display
to
manual control.
Note
that the
trip
log automatic flashing
se-
quence takes priority over the alarm log automatic sequence.
Program
Mode
-
The set-points for the alarms,
thresholds,
and delays
are set
in
the program
mode. They
are protected
with
a
password
to
prevent unauthorized changes.
The
password
is
not required to view the configuration and
set-
points. There is
no
automatic scrolling sequence
in
the
pro-
gram
mode.
However,
if
no key has been
pressed
for
five
minutes, the display will revert to Data mode and start
its
auto
scrolling of
real-time metered values,
Entering
the
Password
-
After entering the program
mode
and
moving down
(or up) in the
scrolling sequence,
the
'PASSWORD"
message
is
displayed.
If
the Down (or Up) key
is
pressed again,
the
display
moves
to
the
next
message
in
the
main
scrolling
sequence,
but the
configuration
parameters
and set-points cannot
be
changed;
they
can
only be viewed.
lf
the
Enter (or Read) key is
pressed,
the
four-digit
password
may
be
entered.
This
will
allow
the
user
to
view and change the
conf
iguration
and
set-points.
The
password
is
entered starting
with the
right-most
digit,
Flashing
acts as
a
cursor
to
indicate the active
digit
(this
manual will use an underline symbol to signify the
digit
which
would
be flashing). The Up
and
Down keys are used to scroll
the
numbers
from
0
through
9.
When
the
correct
digit
is
displayed,
pressing
the
Enter
key
enters
the
number
and
indexes the cursor to the next
left
digit.
The
digits not
being
activated
are
displayed
as
X's,
Afterthe
last
digit
is
entered, the
word "Correct"
or
"lncorrect"
will be
brief
ly
displayed.
The BDU
38
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