ABB MMCO-2 Manual

Instruction
Leaflet
JL
llll
Mil
*
ABB
Power
T
&
D
Company
Inc
.
Relay
Division
Allentown
,
PA
18106
I
.
L
.
41
-
121.2
Type
MMCO
Multi
-
Phase
Overcurrent
Relay
Effective
:
August
,
1996
Supersedes
Preliminary
I
.
L
.
41
-
121.1
Dated
June
,
1993
must
be
practiced
when
handling
printed
cir
-
cuit
boards
and
components
.
Use
of
anti
-
static
handling
materials
and
grounding
pro
-
cedures
is
required
.
Before
putting
relay
into
service
,
remove
all
blocking
which
may
have
been
inserted
for
the
purpose
of
securing
the
parts
during
shipment
.
Operate
the
relay
to
check
the
set
-
tings
and
electrical
contacts
.
The
operation
of
this
relay
is
based
on
ABB
proprietary
software
,
resident
-
in
-
memory
components
.
Purchase
of
this
relay
includes
a
restrictive
license
for
the
use
of
any
and
all
programs
solely
as
part
of
the
protective
functions
.
ABB
reserves
the
right
to
request
return
of
the
memory
components
should
the
relay
no
longer
be
used
as
a
protective
device
.
The
programs
may
not
be
copied
,
transferred
or
applied
to
any
other
device
.
TABLE
OF
CONTENTS
Page
Section
1
Application
2
Construction
3
Characteristics
4
Settings
5
Operation
6
Circuit
Description
..
..
7
Acceptance
Test
8
Adjustments
9
Installation
10
Maintenance
and
Repair
11
Renewal
Parts
-
List
of
Figures
-
Catalog
Numbers
1
2
4
7
8
11
13
14
14
15
15
16
.
42
1
.
APPLICATION
CAUTION
The
MMCO
is
a
multi
-
phase
(
2
or
3
phase
)
and
ground
,
time
and
instantaneous
ac
overcurrent
relay
(
see
Block
Diagram
,
Figure
1
)
.
It
is
used
to
sense
a
current
level
above
a
particular
setting
and
to
trip
a
circuit
breaker
to
clear
faults
.
A
wide
range
of
time
-
current
characteristics
permit
applications
involving
fuses
,
reclosers
,
cold
-
load
pickup
,
and
motor
start
-
ing
,
in
addition
to
essentially
fixed
-
time
applications
.
Typical
applications
of
the
MMCO
relay
are
described
,
in
Table
1
,
with
respect
to
familiar
CO
or
IEC
equivalents
.
It
is
recommended
that
the
user
of
this
equip
-
ment
become
acquainted
with
the
information
in
this
instruction
leaflet
before
energizing
the
relay
.
Failure
to
do
so
may
result
in
injury
to
personnel
or
damage
to
the
equipment
,
and
may
affect
the
equipment
warranty
.
The
relay
contains
static
sensitive
components
.
Electrostatic
Discharge
(
ESD
)
precautions
All
possible
contingencies
which
may
arise
during
installation
,
operation
or
maintenance
,
and all
details
and
variations
of
this
equipment
do
not
purport
to
be
covered
by
these
instructions
.
If
further
information
is
desired
by
purchaser
regarding
this
particular
installation
,
operation
or
maintenance
of
this
equipment
,
the
local
ABB
Power
T
&
D
Company
Inc
.
representative
should
be
contacted
.
Courtesy of NationalSwitchgear.com

I
.
L
.
41
-
121.2
TABLE
1
:
MMCO
APPLICATIONS
RELATED
TO
INVERSE
TIME
CURVES
TYPICAL
APPLICATIONS
DESCRIPTION
CURVE
TYPE
1
)
Differential
protection
where
saturation
of
current
transformers
is
not
expected
,
or
where
insensitive
setting
and
delayed
tripping
is
permissible
.
2
)
Overcurrent
protection
,
phase
or
ground
,
where
coordination
with
downstream
devices
is
not
involved
and
2
to
60
cycle
trip
-
ping
is
allowable
.
MMCO
-
2
Short
Motor
-
locked
rotor
protection
where
allowable
locked
rotor
time
is
approximately
between
10
and
70
seconds
.
MMCO
-
5
Long
Overcurrent
protection
where
coordination
with
downstream
devices
is
not
involved
and
MMCO
-
2
is
too
fast
.
The
operating
time
of
this
relay
does
not
vary
greatly
as
current
level
varies
.
MMCO
-
6
Definite
1
)
Overcurrent
protection
where
coordination
with
other
devices
is
required
,
and
generation
varies
.
2
)
Backup
protection
for
relays
on
other
circuits
.
MMCO
-
7
(
IEC
-
A
)
Moderately
MMCO
-
8
Inverse
MMCO
-
9
(
IEC
-
B
)
Very
Inverse
Motor
protection
where
allowable
locked
rotor
time
is
less
than
10
seconds
.
Overcurrent
protection
where
coordination
with
fuses
and
reclos
-
ers
is
involved
,
or
where
cold
-
load
pickup
or
transformer
inrush
are
factors
.
MMCO
-
11
(
IEC
-
C
)
Extremely
Inverse
display
•
Read
data
for
pervious
16
fault
cases
(
tar
-
gets
)
.
•
Make
all
settings
using
password
entry
.
The
following
types
of
INCOM
devices
are
available
:
Options
are
provided
for
a
real
-
time
clock
and
exter
-
nal
directional
control
.
An
external
3
-
phase
device
(
e
.
g
.
,
KD
-
10
or
H
3
)
is
required
to
supervise
phase
tripping
,
and
a
single
ground
directional
unit
(
e
.
g
.
,
KRC
,
KRP
or
KRD
)
is
required
to
supervise
ground
tripping
.
When this
option
is
included
and
selected
as
being
operative
,
timing
will
not
start
until
the
external
contact
closes
.
An
alternate
option
allows
resetting
to
be
accomplished
externally
(
without
using
the
com
-
munication
channel
)
,
but
only
when
directional
con
-
trol
is
not
supplied
.
Options
for
current
are
as
follows
:
•
INCOM
PONI
(
to
access
MMCO
relay
through
INCOM
network
)
•
RS
-
232
PONI
(
to
access
MMCO
relay
through
RS
-
232
lines
)
2
.
CONSTRUCTION
•
3
PH
Ground
•
3
PH
No
Ground
•
2
PH
Ground
The
MMCO
is
a
microprocessor
-
based
relay
consist
-
ing
of
5
printed
circuit
modules
which
are
packaged
in
a
standard
FT
-
22
flexitest
case
(
see
Figure
2
)
.
Refer
to
I
.
L
.
41
-
076
for
detailed
information
on
the
FT
-
22
case
.
The
5
modules
are
as
follows
(
see
Section
6
CIRCUIT
DESCRIPTIONS
)
:
An
INCOM
communications
device
may
be
pur
-
chased
separately
to
allow
for
access
to
the
MMCO
relay
,
using
an
access
code
.
•
Power
Supply
•
Current
Transformer
(
ct
)
•
Microprocessor
•
Display
The
following
remote
operations
may
be
performed
using
an
INCOM
communications
device
:
•
Read
all
information
available
on
front
panel
2
Courtesy of NationalSwitchgear.com

I
.
L
.
41
-
121.2
2.5
.
DISPLAY
MODULE
•
Input
/
Output
(
I
/
O
)
The
Display
module includes
(
see
Figure
3
)
:
2.1
.
POWER
SUPPLY
The
Power
Supply
is
available
in
two
versions
:
48
to
125
Vdc
or
250
Vdc
.
The Power
Supply
module
con
-
tains
components
of
a
dc
/
dc
converter
,
an
ABB
cus
-
tom
linear
IC
,
a
+
5
Volt
reference
and
adjustment
potentiometers
for
the
+
5
V
reference
,
dc
/
dc
con
-
verter
converts
48
-
125
Vdc
or
250
Vdc
to
21
Vdc
and
5
Vdc
.
A
16
x
2
character
alphanumeric
LCD
for
display
of
the last
four
trip
targets
,
settings
,
metering
,
relay
cat
-
alog
number
,
software
versions
,
and time
and date
(
optional
)
.
A
red
“
TRIP
”
LED
which blinks
when
input
current
is
above time
-
delay
pickup
level
;
is
steady
for
time
-
delay
or
instantaneous
trip
;
and seals
-
in
when
breaker
trip
current
flow
is
detected
.
2.2
.
CURRENT
TRANSFORMER
(
CT
)
The
ct
module
contains
a
current
transformer for
each
phase
and
ground
input
,
as
well
as
input
wave
-
form
conditioning
and
surge
protection
.
Ct
module
outputs
are
sent
to
the
Microprocessor
module
.
An
amber
“
MONITOR
”
LED
which is
“
ON
”
during
nor
-
mal
relay
operation
,
for
power
-
on
and
self
-
check
indi
-
cation
.
This
LED will
be
“
OFF
”
if
there
is
a
relay
hardware
failure
or
alarm condition
.
2.3
.
MICROPROCESSOR
The
Microprocessor
module
contains
a
microcom
-
puter
chip
which includes
an
analog
to
digital
(
A
/
D
)
converter
,
input
and
output ports
and
timers
.
The
module also
includes
memory
,
a
real
-
time
clock
(
optional
)
.
Relay
pickup
calibration
is
part
of
this
module
,
as
well
as
a
trimmer
capacitor
for
adjust
-
ment
of
the
optional
real
-
time
clock
.
There
are
five
keypad
push
-
buttons
as
follows
:
1
)
“
SELECT
”
button
(
SW
1
)
.
Selects
between
the
settings
mode
,
targets
dis
-
play
,
time
setting
and
metering display
.
2
)
“
SCROLL
”
button
(
SW
2
)
.
Accesses
the
different
categories
within
each
mode
.
3
&
4
)
“
RAISE
”
(
SW
3
)
and
“
LOWER
”
(
SW
4
)
buttons
.
Select
the
actual value
of
the
parameter
in
the
settings
mode
.
When
“
RAISE
”
or
“
LOWER
”
has
been
pushed
,
it
is
not
possible
to
“
SELECT
”
or
“
SCROLL
”
new
parameters
without
pushing
“
ENTER
”
first
.
2.4
.
INPUT
/ OUTPUT
The INPUT
/
OUTPUT
module
contains
contact
clo
-
sure
outputs
and
optically
isolated
inputs
.
A
reed
relay
detects the
trip
current
flow
through
trip
con
-
tacts
.
2.4
.
1
.
Contact
Closure
Outputs
(
See Section
6.6
)
(
TDTRIP
)
(
ITRIP
)
(
TDANUNLO
)
(
IANUNLO
)
(
ALARMLO
)
5
)
“
ENTER
”
button
(
SW
8
)
.
Relay
accepts
the
setting
which is shown
on
the
alphanumeric
display
.
In
addition
,
there
are
three other external buttons
that
are
activated
as
follows
:
Time
Delay
Trip
Instantaneous
Trip
Time
Delay
Annunciator
Instantaneous
Annunciator
Alarm
Output
2.4
.
2
.
Optically
-
Isolated
Inputs
(
w
/
Directional
Control
Option
)
Phase Directional
Control
Ground
Directional
Control
“
EXTERNAL
SCROLL
”
button
(
SW
7
)
.
Can
be
pushed
without
opening
the
relay
case
.
This button scrolls the
display
.
“
TARGET RESET
button
(
SW
6
)
.
Can
be
reset
without
opening
the
relay
case
.
This button
resets
the
trip
LED
if
the
trip
LED
has
been
sealed
-
in
by
breaker
trip
current
flow
.
All
target
information
(
16
targets
stored
in
the
relay
)
1
.
(
TCP
)
(
TCG
)
2
.
2.4
.
3
.
Optically
-
isolated
Inputs
(
w
/
Remote
Reset
Option
)
Remote Reset
(
RR
)
3
Courtesy of NationalSwitchgear.com

I
.
L
.
41
-
121.2
outputs
except
the
Alarm
output
(
2.4
above
)
.
A
pen
or
other
slender
object
is
required
to
push
this
button
(
prevents
accidental
activation
)
.
may
be
erased
by
pushing
this
button
for
6
sec
-
onds
.
3
.
“
TRIP
TEST
”
button
(
SW
5
)
.
This
button
causes
the
relay
to
trip
,
activating
all
3
.
CHARACTERISTICS
Meets
all
applicable
ANSI
C
37.90
and
IEC
255
stds
.
Standards
-
20
to
+
55
deg
.
C
(
operating
)
-
40
to
+
70
deg
.
C
(
storage
)
Temperature
Range
50
Hz
or
60
Hz
(
selectable
)
Frequency
Time
Delay
Pickup
Settings
5
Amp
ct
0.5
Amps
to
12
Amps
in
1
.
Amp
steps
01
Amps
to
2.4
Amps
in
.
01
Amp
steps
1
Amp
ct
5
%
for
TD
setting
5
%
for
IT
setting
Pickup
Accuracy
Seven
sets
of
time
curves
from
CO
-
2
to
CO
-
11
.
Each
set
includes
63
curves
.
(
See
Table
2
and
Figures
4
thru
10
)
inverse
Curves
(
U
.
S
.
A
.
version
)
Three
sets
of
time
curves
,
IEC
-
A
,
IEC
-
B
and
IEC
-
C
.
Each
set
includes
63
curves
.
(
See
Table
3
and
Figures
11
thru
13
.
)
Inverse
Curves
(
IEC
version
)
At
5
times
pickup
10
%
or
3
cycles
whichever
is
greater
A
At
20
times
pickup
10
%
or
3
cycles
whichever
is
greater
A
A
NOTE
:
10
ms
pickup
time
must
be
added
to
curves
for
TDTRIP
output
relay
.
Timing
Accuracy
Dropout
Ratio
(
Time
delay
&
Inst
,
contacts
)
98
%
Min
.
TRIP
Reset
Time
2.5
cycles
typical
3.5
cycles
max
.
.
5
A
dc
current
minimum
required
thru
TRIP
contact
circuits
to
Seal
-
in
TRIP
con
-
tacts
and
TRIP
LED
TRIP
Seal
-
In
Current
Pickup
(
with
5
Amp
ct
)
:
1
Amp
to
127
Amps
in
1
Amp
steps
.
Instantaneous
Unit
Pickup
(
with
1
Amp
ct
)
:
0.2
Amps
to
25.5
Amps
in
.
1
Amp
steps
.
Pickup
Settings
Maximum
Pickup
time
:
1.5
cycles
@
current
=
3
x
pickup
2
cycles
@
current
=
2
x
instantaneous
setting
4
cycles
@
current
=
1.2
x
instantaneous
setting
Trip
Contacts
N
.
O
.
contact
for
time
delay
trip
N
.
O
.
contact
for
instantaneous
trip
N
.
C
.
contact
(
contact
closed
if
loss
of
power
or
self
-
check
failure
)
Alarm
Contact
Annunciator
Contacts
N
.
O
.
contact
for
time
delay
trip
N
.
O
.
contact
for
instantaneous
trip
4
Courtesy of NationalSwitchgear.com

I
.
L
.
41
-
121.2
CHARACTERISTICS
,
cont
’
d
.
Make
:
30
Amp
at
250
Vdc
for
1
sec
(
one
shot
)
Break
:
50
W
Resistive
up
to
250
Vdc
Contact
Rating
One
input
requires
battery voltage
to
enable
phase
tripping
.
Second
input requires
battery voltage
to
enable
ground tripping
.
Directional control
can
be
enabled
or
bypassed
on
any
combination
of
the
four
Trip
Units
(
<
J
>
-
TC
,
<
|
)
-
!
NST
,
GRND
-
TOC
,
GRND
-
INST
)
via
settings
with
this
option
.
Directional
Control
(
Option
)
Input
which
causes
reset
of
sealed
-
in
trip
LED
when
battery voltage
is
applied
to
it
.
Remote
Reset
(
Option
)
Targets
are
dated and time
-
tagged
.
Current
date and time
can
also be read
.
(
Uses
lithium
battery
backup
.
)
Real
-
time
Clock
(
Option
)
DC
Power
Drain
8
Watts
max
.
10
Watts
max
.
Operating
Voltage
38
-
140
Vdc
200
-
280
Vdc
Nominal
Voltage
DC
Power
Supply
48
/
125
Vdc
250
Vdc
1
Second
Rating
200
Amps
100
Amps
OHMIC
Burden
Continuous
Rating
16
Amps
5
Amps
ct
Type
5
A
ct
1
Act
AC
Ratings
.
005
O
.
025 0
.
Table
3
:
IEC
(
CO
)
TYPE
TIME
CURVE
CALIBRATION
POINTS
Table
2
:
USA
(
CO
)
TYPE
TIME
CURVE
CALIBRATION
POINTS
OPERATING
TIME
CURVE
TYPE
TIME
CURRENT
APPLIED
TIMES
P
/
U VALUE
OPERATING
TIME
CURVE
TYPE
TIME
CURRENT
APPLIED
TIMES
P
/
U
VALUE
DIAL
DIAL
IN
IN
SECONDS
SECONDS
A
30
5
x
2.038
1.080
MMCO
-
2
5
X
0.352
0.188
30
20
x
20
X
B
5
X
1.607
0.338
5
X
14.693
12.186
30
MMCO
-
5
30
20
X
10
X
C
5
X
5
X
30
1.587
0.095
MMCO
-
6
1.201
1.025
30
20
X
10
X
NOTE
:
10
milliseconds
pickup
time
for
the
TD
relay
must
be
added
to
the above
operate
times
for
total
operate
time
of
the
MMCO
relay
.
5
X
MMCO
-
7
30
1.585
0.859 20
X
MMCO
-
8
5
X
1.979
0.872
30
20
X
MMCO
-
9
5
X
30
1.331
0.572 20
X
MMCO
-
11
5
X
1.226
0.195
30
20
X
NOTE
:
10
msec
pickup
time
,
for
the
TD
relay
,
must
be
added
to
the above
operate
times
for
total
MMCO
relay
operate
time
.
5
Courtesy of NationalSwitchgear.com

I
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L
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41
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121.2
1
.
Transformer
inrush
2
.
Capacitor
inrush
3
.
Faults
having
magnitudes
associated
with
loca
-
tions
at
or
beyond
the
next
protective
device
.
Consideration
must
be
given
to
the
added
effect
of
dc
offset
in
the
phenomenon
listed
.
In
general
,
a
setting
of
120
%
of
the
symmetrical
current
(
no
dc
offset
present
)
will
provide
adequate
security
.
4
.
SETTINGS
4.1
.
TIME
OVERCURRENT
FUNCTION
The
level
and
time
settings
are
dictated
by
those
nor
-
mal
system
phenomena
which
must
be
ignored
,
and
by
the
minimum
current
the
system
is
expected
to
deliver
to
a
fault
in
the
protected
zone
of
the
relay
.
For
the
phase
units
,
pick
up
and
time
settings
must
be
chosen
with
due
consideration
given
to
such
long
or
moderate
time
phenomena
as
:
4.3
.
INVERSE
TIME
CURVES
The
MMCO
relay
simulates
the
traditional
inverse
curve
sets
(
USA
or
IEC
version
)
,
which
are
perma
-
nently
stored
in
memory
.
1
.
Maximum
load
2
.
Cold
-
load
pickup
3
.
Motor
starting
Pickup
and
time
settings
above
any
of
these
influenc
-
ing
factors
must
be
chosen
.
Coordination
with
other
devices
must
also
be
achieved
.
A
time
of
0.3
sec
-
onds
plus
breaker
time
is
generally
recommended
as
a
coordinating
time
interval
(
CTI
)
between
adjacent
relays
being
coordinated
.
With
careful
evaluation
of
current
transformer
errors
,
setting
accuracy
and
worst
case
relay
errors
,
a
lower
CTI
may
be
used
.
4.3
.
1
.
USA
Version
/
CO
Curves
There
are
seven
families
of
CO
curves
:
1
.
MMCO
-
2
-
Short
Inverse
2
.
MMCO
-
5
-
Long
Inverse
3
.
MMCO
-
6
-
Definite
Inverse
4
.
MMCO
-
7
-
Moderate
Inverse
5
.
MMCO
-
8
-
Standard
Inverse
6
.
MMCO
-
9
-
Very
Inverse
7
.
MMCO
-
11
-
Extreme
Inverse
Where
a
ground
setting
is
chosen
,
attention
should
be
given
to
:
Each
family
contains
63
curves
determined
by
the
time
dial
setting
(
see
Figures
4
thru
10
)
.
The
expres
-
sions
for
the
CO
curves
are
shown
in
equation
(
1
)
for
l
/
IO
greater
than
1.5
per
unit
,
and
equation
(
2
)
for
l
/
IO
between
1.0
and
1.5
per
unit
.
1
.
Maximum
residual
load
unbalance
2
.
Loss
of
largest
single
-
phase
load
(
for
example
,
as
a
result
of
fuse
-
blowing
)
Pickup
for
ground
sensing
should
be
set
at
a
current
level
above
these
conditions
.
Time
delay
for
ground
tripping
should
be
set
to
coordinate
with
other
devices
.
T
=
[
To
+
K
/
(
l
/
IO
-
C
)
P
]
x
D
/
24
,
000
T
=
[
R
/
(
1
/
10
-
1.0
)
]
x
D
/
24
,
000
trip
time
in
seconds
definite
time
term
input
current
pickup
current
settings
scale
factor
for
the
basic
inverse
time
a
constant
a
constant
an
exponent
determining
the
inversions
time
dial
setting
from
1
to
63
(
1
)
(
2
)
where
T
To
I
Curve
shapes
may
be
chosen
independently
for
the
phase
and
ground
functions
.
A
single
setting
estab
-
lishes
the
curve
shape
for
the
2
(
or
3
)
phases
.
•
o
=
K
C
4.2
.
INSTANTANEOUS
OVERCURRENT
FUNC
-
TION
R
P
The
instantaneous
settings
must
be
chosen
to
be
above
:
D
6
Courtesy of NationalSwitchgear.com

I
.
L
.
41
-
121.2
5
.
OPERATION
Table
4
indicates
all
values
of
pre
-
determined
param
-
eters
(
To
,
K
,
C
,
P
and
R
)
in
the
program
for
each
curve
.
Parameters
l
0
and
D
are
user
-
selectable
via
pickup
setting
and
time
dial
switches
,
respectively
.
The
MMCO
relay
continually
executes
its
protective
functions
whenever
DC
power
is
applied
to
the
relay
.
Concurrently
with
this
protective
function
,
four
modes
may
be
selected
using
the
front
panel
keypad
switches
.
Table
4
:
TIME
CURVE
PARAMETERS
c
CURVE
K
P
R
To
The
modes
are
:
MMCO
-
2
MMCO
-
5
MMCO
-
6
MMCO
-
7
MMCO
-
8
MMCO
-
9
MMCO
-
11
735
0.675
1.130
1.190
0.800
1.270
1.350
0.500
1
510
112
13769
1
22705
8197
•
Metering
•
Settings
•
Targets
Set
Time
(
Only
with
optional
real
-
time
clock
)
671
1
1475
785
2491
3121
1
525
9200
478
4122
2756
17640
1
9342
310
1
110
2
8875
4.3
.
2
.
IEC
Curves
In
addition
to
the
keypad
switches
which
select
the
relay
modes
,
there
are
three
switches
accessible
from
the
front
panel
dedicated
to
special
functions
.
There
are
three
families
of
IEC
curves
;
IEC
-
A
,
IEC
-
B
,
IEC
-
C
.
Each
family
contains
63
curves
determined
by
the
time
dial
setting
(
see
Figures
11
thru
13
)
.
The
expression
for
the
IEC
curves
is
shown
in
the
equa
-
tion
(
3
)
below
:
These
functions
are
:
•
TRIP
TEST
•
TARGET
RESET
•
EXTERNAL
SCROLL
A
flow
chart
for
MMCO
relay
keypad
operation
is
included
(
Figure
16
)
for
reference
.
T
=
(
K
x
D
/
63
)
/
[
G
/
Gs
)
a
-
1
]
(
3
)
(
3
)
where
T
=
Theoretical
operating
time
(
seconds
)
K
=
constant
characterizing
the
relay
(
seconds
)
D
=
time
dial
setting
from
1
to
63
G
=
value
of
the
characteristic
quantity
(
i
.
e
.
,
current
through
relay
ct
)
.
Gs
=
setting
value
of
characteristic
quantity
(
i
.
e
.
,
pickup
setting
)
a
=
index
characterizing
the
algebraic
function
5.1
.
METERING
MODE
(
“
M
”
IN
UPPER
LEFT
CORNER
OF
DISPLAY
)
When
dc
power
is
applied
to
the
relay
it
displays
the
metering
mode
with
IA
,
IB
,
and
S
(
status
)
appearing
on
the
front
panel
.
When the
relay
is
not
in
the
Meter
-
ing
Mode
the
“
SELECT
”
button
can
be
used
to
go
to
this
mode
.
The
following
additional
information
can
be
displayed
using
the
scroll
button
:
IC
,
I
0
,
and
with
the
real
time
clock
option
:
day
,
date
and
time
.
The
following
values
are
used
for
a
and
K
:
When
in
the
Metering
Mode
,
the
status
,
“
S
”
,
appears
in
the
upper
right
hand
corner
of
the
display
.
When
there
is
an
internal
hardware
or
software
failure
in
the
relay
the
amber
MONITOR
LED
goes
out
and
the
value
of
the
status
indicates
the
cause
of
the
failure
.
The
meaning
of
the
status
coded
(
S
=
““
)
are
as
fol
-
lows
:
Very
Inverse
Time
(
B
)
Extreme
Inverse
Time
(
C
)
Standard
Inverse
Time
(
A
)
K
0.14
13.5
80.0
1.0
0.02
2.0
a
7
Courtesy of NationalSwitchgear.com

I
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L
.
41
-
121.2
The
available
curves
are
listed
in
Table
1
and
graphed
in
Figures
4
-
13
.
Time
dials
range
from
1
to
63
for
each
curve
type
.
The
available
time
and
instantaneous
pickup
settings
and
frequency
settings
are
listed
in
section
3
(
Characteristics
)
.
EEPROM
RAM
EPROM
A
/
D
S
=
00
S
=
01
S
=
02
S
=
03
S
=
04
S
=
05
S
=
06
S
=
07
S
=
08
S
=
09
S
=
10
S
=
11
S
=
12
S
=
13
S
=
14
S
=
15
pass
pass
pass
pass
pass
pass
pass
pass
pass
pass
pass
pass
pass
pass
pass
fail
fail
pass
fail fail
fail
pass
pass
pass
Directional
control
inputs
are
available
as
an
option
.
With
this
option
,
directional
control
inputs
for
phase
and
ground
instantaneous
and
time
delay
tripping
may
be
selected
using
the
settings
mode
.
For
exam
-
ple
,
when
phase
time
delay
directional
control
has
been
selected
,
battery
positive
voltage
must
be
applied
to
relay
terminal
18
and
battery
negative
volt
-
age
to
terminal
20
(
Figure
17
)
in
order
to
enable
phase
time
delay
tripping
.
When
ground
instanta
-
neous
directional
control
has
been
selected
,
battery
positive
voltage
must
be
applied
to
terminal
19
and
battery
negative
voltage
to
terminal
20
in
order
to
enable
ground
instantaneous
tripping
.
fail fail
fail
fail
pass
fail fail
fail
fail
pass
pass pass
pass
pass
pass
pass
fail
fail
fail
fail
pass
fail
fail
fail
fail
fail
pass
pass pass
fail
fail
fail
fail
fail
fail
pass
fail
fail
fail
fail
5.2
.
SETTINGS
MODE
(
“
S
”
IN
UPPER
LEFT
CORNER
OF
DISPLAY
)
This
mode
is
selected
by
pushing
the
“
SELECT
”
but
-
ton
.
Initially
the
software
“
Version
#
"
appears
on
the
display
.
Using
the
“
SCROLL
”
button
the
following
set
-
tings
may
be
selected
:
The
directional
control
option
settings
are
:
Directional
Control
Display
None
Grnd
.
T
.
D
.
Grnd
.
Inst
.
Grnd
.
Inst
.
&
T
.
D
.
Ph
.
T
.
D
.
Ph
.
Inst
.
Ph
.
Inst
.
&
T
.
D
.
Ph
.
Inst
.
&
Grnd
.
T
.
D
.
Ph
.
Inst
&
Grnd
.
Inst
.
Ph
.
Inst
&
Grnd
.
Inst
.
&
T
.
D
.
Ph
.
T
.
D
.
&
Grnd
.
T
.
D
.
Ph
.
T
.
D
.
&
Grnd
.
Inst
.
Ph
.
T
.
D
.
&
Grnd
.
Inst
.
&
T
.
D
.
Ph
.
Inst
.
&
T
.
D
.
&
Grnd
.
T
.
D
.
Ph
.
Inst
.
&
T
.
D
.
&
Grnd
.
Inst
.
Ph
.
Inst
.
&
T
.
D
.
&
Grnd
.
Inst
.
&
T
.
D
.
G
T
PHASE
PICKUP
GRND
PICKUP
PHASE
INST
.
GROUND
INST
.
PH
TIME
DIAL
GRND
TIME
DIAL
OPTION
(
not
changeable
)
PHASE
CURVE
GROUND
CURVE
FREQUENCY
DIR
CONTROL
(
only
with
directional
control
option
)
INCOM
KEY
(
for
use
with
INCOM
accessories
)
MMCO
RELAY
VERSION
#
Gl
GIT
P
T
PI
PIT
PI
_
G
_
T
PI
_
GI
_
PLGIT
P
_
TG
_
T
P
_
TGI
_
P
_
T
GIT
PIT
G
_
T
PIT
Gl
_
PIT
GIT
The
directional
control
settings
are
selected
using
the
raise
and
lower
buttons
when
in
the
“
DIR
CON
-
TROL
”
settings
mode
.
When
the
relay
is
in
one
of
the
above
setting
modes
,
the
value
of
the
setting
can
be
changed
using
the
raise
or
lower
buttons
.
Once
the
value
of
the
setting
has
been
changed
,
the
“
ENTER
”
button
must
be
pushed
before
the
relay
can
be
scrolled
to
the
next
setting
.
The
“
ENTER
”
button
also
causes
the
relay
to
accept
the
new
setting
.
The
INCOM
key
setting
allows
the
INCOM
key
num
-
ber
to
be
changed
to
an
integer
between
0
and
255
.
This
key
is
required
to
access
the
relay
through
a
8
Courtesy of NationalSwitchgear.com

I
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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
Courtesy of NationalSwitchgear.com

I
.
L
.
41
-
121.2
(
Power
Supply
Module Internal
Schematic
Figure
22
)
which is controlled
by
the
microprocessor
U
2
.
The
ranging
chip
multiplexes
the
phase
and
ground
inputs
.
Op
amp
U
1.2
,
and associated
resistors allow
for
calibration
of
the
high
level
input
voltage
to
the
microprocessor
.
The calibration
is made
by adjusting
potentiometer
P
1
so
that the
relay
pickup
and
meter
-
ing
are
correct
with
the
input
current set to
4
amps
or
greater
(
0.8
A
or
greater
with
the
1
A
ct
)
.
remains
in
the
display
mode
which
it
was
in
when the
“
EXTERNAL
SCROLL
"
switch
was
released
.
Settings
cannot
be
changed
using
the
“
EXTERNAL
SCROLL
”
button
.
6
.
CIRCUIT
DESCRIPTION
Documents
referenced
are
:
•
Current
Transformer
Module
Internal
Sche
-
matic
(
Figure
18
)
•
Microprocessor
Module
Internal
Schematic
(
Figure
20
)
•
Power
Supply
Module
Internal
Schematic
(
Figure
22
)
•
Display
Module
Internal
Schematic
(
Figure
Referring
to
Power
Supply
Module Internal
Sche
-
matic
,
Figure
22
:
A
5
-
volt
voltage
reference
for
the
A
/
D
converter
and
for
the
5
volt
power
supply
is
generated by voltage
reference
Z
6
,
Op
amp
U
2.1
and associated
discrete
components
.
24
)
•
I
/
O
Module
Internal
Schematic
(
Figure
26
)
6.1
.
CURRENT
INPUT
CIRCUITRY
Since
there
are
four
identical
sets
of
circuitry
for
phase
A
,
B
,
C
,
and
ground
only
the
circuitry
for
phase
A will
be
described
.
6.2
.
MICROPROCESSOR SUPPORT
CIRCUITRY
Referring
to
the
Microprocessor
Module
Internal
Schematic
,
Figure
20
:
Referring
to
the
ct
Module
Internal
Schematic
,
Figure
The
microprocessor
is
supported
by
chip
selector
U
11
,
address latch
U
5
,
32
K
bytes
of
EPROM
(
U
7
)
,
2
K
bytes
of
RAM
(
U
8
)
and
512
bytes
of
EEPROM
18
:
Current
is
input
to
the
relay
at
terminals
4
and
5
(
for
phase
A
)
,
stepped
down
by
current
transformer
T
1
and
full
wave
rectified
by
diode
bridge
BR
1
.
Resistors
R
1
and
R
10
convert
the
input
current
to
voltage
.
Diodes
D
1
,
D
5
and
CR
1
clamp
the
voltages
to
safe
values
.
Resistor
R
5
protects
the
microprocessor
input
(
U
2
,
on
Microprocessor
Schematic
,
Figure
20
)
.
For low level
current
inputs
,
up
to
3.75
Volts
across
resistor
R
1
,
the
input
voltage
is measured
directly by
the
analog
to
digital
(
A
/
D
)
converter
within
the micro
-
computer
chip
(
U
2
,
Microprocessor
Module
Sche
-
matic
,
Figure
20
)
.
(
U
6
)
.
A
real
-
time clock
chip
(
U
9
)
is accessed
by
the micro
-
processor
and
gives
date and time
information
.
For
relays
with
the
real
-
time clock
option
,
a
lithium
battery
(
BT
1
)
type
BR
2016
or
CR
2016
is
in
a
battery
holder
on
this
board
.
Diode
D
3
and resistor
R
44
are
in
series
with
the
battery
in
order
to
insure that the
battery
will
not
be
charged
.
Relays
without the real
-
time clock
option
do
not
have
a
battery
.
Referring
to
the
Microprocessor
Module
Internal
Schematic
,
Figure
20
:
WARNING
Each
phase
and
ground
go
to
different
pins
on
the
microprocessor
U
2
and
are
multiplexed
internally by
the
microprocessor
U
2
.
For
higher
level
signals
the
voltage
across
resistor
R
10
(
ct
Module Internal
Sche
-
matic
Figure
18
)
is scaled
by
a
ranging
chip
U
3
Replace
battery
with
ABB
Style
9648
a
03
h
01
only
.
Use
of
another
battery
may
present
the
risk
of fire
or
explosion
.
10
Courtesy of NationalSwitchgear.com