ABB MMCO-2 - Page 13

I
.
L
.
41
-
121.2
the
relay
style
matches
the
required
dc
battery
volt
-
age
and
ct
type
.
7.3
.
TIME
CURVE
Time
curve
calibration
points
are
shown
in
Tables
2
and
3
.
With
time
dial
set
to
the
indicated
position
,
apply
currents
specified
in
Table
2
or
3
,
and
measure
the
operating
time
of
the
relay
.
The
operating
times
should
equal
those
of
Table
2
or
3
,
within
10
%
or
3
cycles
,
whichever
is
larger
.
a
.
Adjust
R
29
on
Power
Supply
Board
so
that
+
5.0
Vdc
appears
between
VA
REF
(
TP
2
,
red
test
jack
)
and
ground
(
TP
1
,
black
test
jack
)
,
on
Dis
-
play
PC
Board
.
b
.
Set
the
phase
and
ground
time
pickup
to
5
amps
.
Set
the
phase
and
ground
instantaneous
pickup
to
20
amps
.
Set
the
phase
and
ground
curves
to
MMCO
-
11
with
time
dial
of
63
.
7.4
.
INSTANTANEOUS
TRIP
a
.
Set
the
phase
and
ground
pickup
to
4.5
amps
(
0.9
Amps
for
1
Amp
ct
)
.
Set
the
phase
and
ground
instantaneous
pickup
to
5
Amps
(
1
Amp
for
1
Amp
ct
)
.
Set
the
phase
and
ground
curve
to
CO
-
11
and
time
dial
to
63
.
b
.
Apply
5.1
Amps
(
1.1
Amps
for
a
1
Amp
ct
)
to
the
ground
ct
input
of
the
relay
.
An
instanta
-
neous
trip
should
occur
.
Verify
by
reading
the
most
recent
target
(
T
1
)
information
.
c
.
Turn
off
the
ac
and
dc
sources
and
then
apply
dc
supply
only
.
The
trip
LED
should
be
on
again
.
Reset
the
LED
.
d
.
Repeat
steps
b
and
c
(
above
)
with
current
applied
to
each
of
the
remaining
inputs
.
e
.
This
completes
the
acceptance
test
;
return
all
settings
to
the
desired
position
.
c
.
Apply
5.0
Amps
to
phase
A
terminals
.
Adjust
P
1
so
that
IA
=
5.0
Amps
appears
on
the
display
.
d
.
Vary
the
phase
A
current
and
verify
that
the
trip
light
begins
to
blink
when
the
current
applied
to
phase
A
is
between
4.75
Amps
and
5.25
Amps
.
If
not
,
adjust
P
1
so
that
the
trip
LED
begins
to
blink
when
5
Amps
is
applied
to
phase
A
.
8.2
.
DISPLAY
ADJUSTMENT
The
LCD
display
is
factory
adjusted
for
general
pur
-
pose
viewing
.
The
display
adjustment
on
the
upper
-
left
hand
corner
of
the
front
panel
can
be
used
to
optimize
the
display
readability
for
the
particular
light
-
ing
and
viewing
angle
conditions
in
which
the
relay
is
situated
.
With
the
relay
in
the
lighting
conditions
and
location
in
which
it
is
used
,
turn
the
display
adjust
potentiometer
until
the
display
may
be
read
easily
.
8
.
ADJUSTMENTS
The
proper
adjustments
to
insure
correct
operation
of
this
relay
have
been
made
at
the
factory
.
Upon
receipt
of
the
relay
,
no
customer
adjustments
other
than
those
covered
under
SETTINGS
should
be
required
.
Under
unusual
lighting
conditions
or
large
viewing
angles
,
the
LCD
display
may
be
adjusted
for
better
contrast
as
described
in
the
“
Display
Adjust
-
ment
”
portion
of
this
section
(
8.2
)
.
8.3
.
ADJUSTMENT
FOR
OPTIONAL
REAL
-
TIME
CLOCK
The
real
-
time
clock
adjustment
is
made
in
the
factory
.
It
is
not
recom
-
mended
that
the
customer
attempt
this
adjustment
because
it
involves
removing
the
Microprocessor
mod
-
ule
.
To
adjust
the
real
-
time
clock
,
connect
a
frequency
counter
(
with
at
least
6
decimal
places
of
resolution
)
between
digital
ground
and
the
“
time
”
test
point
on
the
Microprocessor
module
.
Apply
dc
power
to
the
relay
.
Adjust
trimmer
capacitor
(
C
18
)
on
the
Micro
-
processor
PC
Board
so
that
the
measured
frequency
is
as
close
to
1.000000
Hertz
as
possible
.
If
a
period
is
measured
,
it
should
be
as
close
as
possible
to
1.000000
second
.
NOTE
:
8.1
.
CALIBRATION
The
relay
has
been
calibrated
in
the
factory
by
using
potentiometers
(
P
1
on
the
Microprocessor
PC
Board
and
R
29
on
Power
Supply
Board
)
.
Further
adjust
-
ment
is
unnecessary
unless
the
relay
is
found
to
be
out
of
calibration
on
the
Acceptance
Test
.
Before
performing
relay
calibration
,
check
that
the
relay
has
been
set
for
the
rated
frequency
,
and
that
13
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