ABB MMCO-2 - Page 9

I
.
L
.
41
-
121.2
ues
to
keep
time when
power
has been removed
from
the
relay
although
the
display
goes
blank
.
communications
network
.
If
the
communications
option
is
not
being
used
,
the
INCOM
key
setting
should be
ignored
.
5.5
.
TRIP
TEST
FUNCTION
The
“
TRIP
TEST
”
push
-
button switch
is located
in
the
upper
right
corner
of
the
front
panel
.
It
is
used
to test
the
trip
and
annunciator
outputs
to
the
relay
.
When
this switch
is
pushed
,
the
time
delay
and instanta
-
neous
trip
and
annunciator
output
contacts
close and
the
trip
LED
goes
on
.
The
test
trip
data is saved
and
displayed
as
“
T
1
”
in
the
same manner as
an overcur
-
rent
trip
The
TRIP LED will
remain
on
(
Seal
in
)
if
there
was
current
flow
through
the
trip
contacts
.
A
slender
object
such
as
a
pen
is
required
to
push
the
“
TRIP
TEST
”
switch
.
This
prevents
accidental
trip
-
ping
of
the
MMCO
relay
.
5.3
.
TARGETS
MODE
(
“
T
”
IN
UPPER
LEFT
CORNER
OF
DISPLAY
)
The
Targets
(
trip
data
)
for
the
previous
four faults
(
“
T
1
”
to
“
T
4
”
)
can
be
displayed by
pushing
the
“
SELECT
”
push
-
button
.
Data
for
the
previous
16
faults
can
be read
remotely
if
the
communications
option
is
used
.
The
“
SCROLL
”
button
is used
to
scroll
through
the
data
for
each
target
,
displaying
the
following
informa
-
tion
:
Type
of
trip
:
Phase
or
Grnd
.
&
Inst
,
or
Time
Delay
5.6
.
TARGET
RESET
FUNCTION
The
“
TARGET RESET
”
push
-
button
switch is located
in
the lower
right
corner
of
the
relay
front
panel
.
An
external
lever makes
the
“
TARGET
RESET
”
switch
accessible
when
relay
case
is closed
.
When breaker
trip
current
flow
is detected
by
the
MMCO
,
the
“
TRIP
”
LED
is sealed
in
(
remains
on
after
overcurrent
is
removed
)
.
The
sealed
in LED
is
extinguished by
pushing
the
‘
TARGET RESET
”
switch
.
If
this switch
is
held
in
the
on
position
for
6
seconds
,
all
target
information
(
T
1
-
T
16
)
is erased
.
•
Current
at
trip
time
:
IA
,
IB
,
IC
,
I
0
•
Time
of
trip
(
option
)
:
Day
,
Date
,
Time
If
the
relay
is
not
in
the
settings
mode
,
the
display
will
jump
to
the
most
recent
trip
data
(
T
1
)
when
a
trip
occurs
.
In
order
to
ensure
proper
fault
cur
-
rent
target
data
,
the
fault
current
must
remain
for
a
minimum
of
three
cycles
and
at
least
1
cycle
after
trip
.
For
times less than
this
,
the
fault
current
level
displayed
will
be lower
than the
actual
.
NOTE
:
With
the
remote
reset
option
,
the sealed
in
trip
LED
may
be
reset
(
extinguished
)
remotely
.
To
reset
the
trip
LED
remotely
,
battery
positive
voltage
must
be
applied
to
relay
terminal
18
and
battery
negative
volt
-
age
to
terminal
20
(
Figure
17
)
.
The
remote
reset
will
not
reset
relay
target
information
available
on
the
LCD
display
.
5.4
.
SET
TIME
MODE
(
ONLY
WITH
OPTIONAL
REAL
-
TIME
CLOCK
)
(
“
ST
”
in
upper
left
corner
of
display
.
)
5.7
.
EXTERNAL
SCROLL
FUNCTION
The
“
EXTERNAL
SCROLL
”
push
-
button switch is
located
in
the lower
left
corner
of
the
relay
front
panel
.
An
eternal
lever makes the
“
EXTERNAL
SCROLL
”
switch
accessible when
relay
case
is
closed
.
When held
in
the
on
position
,
this switch
scrolls the
display
through
all
relay
information
(
Soft
-
ware
Version
Number
,
Settings
,
Relay
Style
Number
,
Target
Information
,
Metering
,
Time
)
.
When the
“
EXTERNAL
SCROLL
”
switch is released
,
the
relay
The
Set
Time mode
can
be
accessed
by pushing
the
“
SELECT
”
button
.
Once
in
this mode
,
the
“
SCROLL
’
button is used
to
select which
parameter
is
to
be
changed
:
day
of
week
,
month
,
day
,
year
,
hour
(
24
hour
clock
)
,
minute
,
second
.
The value
of
each
parameter
is
changed using
the
“
RAISE
”
or
“
LOWER
”
button
to start
it
running
.
When
the
“
ENTER
”
button has
been
pushed
the
relay display
goes
to
the
metering
Mode
,
displaying
the clock
infor
-
mation
(
Day
,
Date
,
Time
)
.
The real
-
time clock contin
-
9
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