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7a
Breaker Display Unit
TRIP
SET
TRIP:YES
O
Pressing any other key than
Enter
will abort changes
and
automati-
cally advance to the next configuration window.
Changing the Trip Settings (Example shows
changing
I
UNBAL delay
from
l0
to
B
seconds).
Clearing
Min/Max and
kwhr/kVARhr
Values
-
The
m
i
n
i
m
um/
maximum
values for
all
real-time measured parameters
and
the accumulated kilowatt
and
kilovar hours
can be
cleared
after entering the
correct
password.
To
clear min/max values,
use
the
Up
or
Down keys to
scroll through the
main program
sequence
to
the
"CLR Mn/Mx"
window and press
Enter.
The
message "Enter?" will
appear
requesting confirmation. Press-
ing
Enter
again will reset the min/max log
in
the
trip
unit's non-
volatile memory
to the
present values
of
each
reallime
measured parameter,
and the
message "Executed"
will
be
briefly
displayed
before returning
to
the
"CLR
Mn/Mx" window.
Pressing any
other
key
will abort clearing
of
the
min/max
log
and
return
to
the "CLR
Mn/Mx" window
after
a
brief "Canceled"
message
is
displayed.
Resetting the kilowatt hour
and
kilovar
hour registers to zero is accomplished from
the
CLR
kWh'
window
in
the same
way.
Note
that
no
action can
be taken
from
these two program
windows
unless the
correct password
has
been entered.
LED
Display Brightness Control
-
The
LED
display
bright-
ness has been selected
to
meet
a wide
variety
of
ambient
lighting conditions,
and
should not require adjustment.
The
LED
brightness can be changed,
however,
to meet
extreme
lighting conditions
if
required.
To
vary the brightness,
select
the
"DIMMER"
window in
the
main program sequence
and
press
Read to
display the preset setting; shown
as
"Bright=2".
lf the
password has been entered,
the Up and
Down
keys
can be
used
to
select
brightness
from
0
(brightest)
to
6
(dimmest). The LED brightness
will
immediately change
as
different
numbers
are
selected.
When
the
desired
bright-
ness
is
found,
press
Enter
to return
to
the
'DIMMER" window.
Note
that the
new brightness number
is
stored
in
active
memory
in
the BDU and will automatically return
to
the default
value of
2
if
control power
is lost momentarily.
BDU
Self-Test Function
-
The BDU has
a
selttesting
feature
which
allows the operator to
check for proper operation
of
all
pixels (or
dots)
in
the
LED
display,
read the version numbers
of
the
BDU and
trip
unit software,
and
read the
catalog
suffix
number
of
the
trip
unit to indicate the metering
and
protective
relaying
function options which
are
installed,
The
self-test
function can also be used to
reset
the BDU
microprocessor
in
the
unlikely event
of
a
program execution
error.
The
self-test function
is
activated from
anywindow
by
pressing
the
Up
and Down
keys
at
the same
time and then holding them
down
as the
display
automatically
scrolls through
"Test?"
followed
bythe
LED
pixel
check
"::i::ri:i::il:l::::ir".
Releasing
the
keys
will
allow an automatic
scroll
indicating BDU RAM
memory
pass
or
fail
BDU
ROM
memory pass
or
fail, the BDU software
version number (shown as "BDU:2.10)
followed
by an indica-
tion of the installed metering and protection options and
trip
unit software version number (shown as
"CNPX
2.24")
and
an
automatic
return to the
top
of
the data mode
sequence.
42
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