Eaton Cutler-Hammer Digitrip RMS 510 User manual

Cutler
-
Hammer
I
.
L
.
29
-
885
B
Instructions
for
Digitrip
RMS
510
Trip
Unit
Table
of Contents
1.0
General
Description
Protection
Information
1.3
Testing
2.0
UL Listed Devices
3.0
Principle
of
Operation
General
3.2
Trip
and
Operation
Indicators
3.3
Test Provisions
Discriminator
(
Making
Current
Release
)
.
3.5
OVERRIDE
(
Fixed Instantaneous
)
3.6
Zone
Interlocking
4.0
Protection
Settings
General
Long Delay
Current
Settings
4.3
Long Delay
Time
Settings
Short
Delay
Current
Settings
4.5
Short
Delay
Time
Settings
4.6
Instantaneous
Current
Settings
NO
Instantaneous
Current
Settings
Ground
Fault
Current
Settings
4.9
Ground
Fault Time
Delay
Settings
5.0
Test Procedure
General
5.2
When To Test
5.3
Test Provision
5.4
Conducting
Tests
5.4
.
1
Control
Power
5.4
.
2
Not
Tripping
the Breaker
5.4
.
3
Tripping
the Breaker
6.0
Battery
(
Inside the
Rating Plug
)
6.1
General
Battery
Check
6.3
Battery
Replacement
7.0
Auxiliary
Power Module
8.0
Frame
Ratings
,
(
where
applicable
,
Sensor
Ratings
)
and
Rating Plugs
9.0
References
Digitrip
RMS
Trip
Assemblies
9.2
Type
DS
Low
Voltage
AC
Power
Circuit
Breakers
9.3
Type
SPB
Systems
Pow
-
R
Breakers
. . . .
9.4
Series C
%
®
R
-
Frame Molded
Case Circuit
Breakers
Appendix
A
Zone
Interlocking
-
Example
Page
WARNING
1
1.1
1
DO NOT
ATTEMPT
TO
INSTALL
OR PERFORM
MAIN
-
TENANCE
ON
EQUIPMENT
WHILE IT
IS
ENERGIZED
.
DEATH
OR
SEVERE PERSONAL
INJURY
CAN
RESULT
FROM CONTACT
WITH
ENERGIZED
EQUIP
-
MENT
.
ALWAYS
VERIFY THAT
NO VOLTAGE
IS
PRESENT
BEFORE PROCEEDING
WITH THE
TASK
,
AND
ALWAYS
FOLLOW GENERALLY
ACCEPTED
SAFETY PROCEDURES
.
CUTLER
-
HAMMER
IS
NOT
LIABLE
FOR
THE
MISAPPLICATION
OR
MISINSTAL
-
LATION OF
ITS PRODUCTS
.
It
is
strongly urged
that the
user
observe all
recommen
-
dations
,
warnings
and cautions
relating
to
the
safety
of
personnel
and
equipment
,
as
well
as
general
and local
health and
safety
laws
,
codes
,
and
procedures
.
The
recommendations and
information
contained
herein
are
based
on
experience
and
judgment
,
but should
not
be considered
to
be all
-
inclusive
or
covering
every
appli
-
cation
or
circumstance which
may
arise
.
If
you
have
any
questions
or
need
further information
or
instructions
,
please
contact
your
local
representative
,
or
the
Customer
Support
Center for
the
type
of
circuit breaker
you
have
:
1.2 2
4
4
4
3.1
4
5
5
3.4
5
6
6
6
4.1
6
4.2
7
7
8
4.4
8
8
4.7
8
4.8
8
9
10
5.1 10
11
Circuit
Breaker
Type
Call Send
to
FAX
Number
11
Telephone
Number
11
DS
/
DSL
(
412
)
937
-
6029
(
412
)
937
-
6029
(
412
)
937
-
6490
(
412
)
937
-
6396
(
412
)
937
-
6396
(
412
)
937
-
6010
11
SPB
Series C
®
R
-
Frame
12
12
12
1.0
GENERAL
DESCRIPTION
12
6.2
12
1.1
Protection
The
Digitrip
RMS
510
,
illustrated
in
Fig
.
1
,
is
a
custom
application
specific
integrated
circuit based
trip
unit suit
-
able
for
use
in
types
DS
and
DSL
low
voltage
AC
power
circuit breakers and
type
SPB
Systems
Pow
-
R
circuit
breakers and
Series C
®
R
-
Frame molded
case
circuit
breakers
.
The
Digitrip
RMS
510
provides
true
RMS
current
sensing
for
proper
correlation
with
thermal characteristics
of
con
-
ductors and
equipment
.
Interchangeable rating plugs
are
provided
to
establish the continuous
current
rating
of
each circuit breaker
.
12
14
14
15
9.1 15
15
15
15
15
FAT
'
N
Effective
May
1997
,
Supersedes
I
.
L
.
29
-
885
A
dated
Septem
-
Courtesy of NationalSwitchgear.com

I
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L
.
29
-
885
B
Page
2
The
Digitrip
RMS
510
Trip
Unit is
completely
self
-
con
-
tained and when the circuit breaker is closed
,
requires
no
external control
power
to
operate
its
protection
sys
-
tems
.
It
operates
from
current
signal
levels and control
power
derived
through
current
sensors
integrally
mounted
in
the circuit breaker
.
Note
*
:
RMS
Digitrip Type
LI
,
LS
,
and
LSI
trip
units
can
be
applied
on
3
-
pole
or
4
-
pole
circuit breakers
for
protection
of
the neutral circuit
,
IF
the circuit
breaker is wired and
MARKED
for
NEUTRAL
PRO
-
TECTION
.
Refer
to
the
National
Electric
Code for
appropriate application
of
4
-
pole
breakers
.
The
Digitrip
RMS
510
Trip
Unit is available
in
six
different
types
.
Each
trip
unit
may
be
equipped
with
a
maximum
of
five
phase
and
two
ground
(
time
-
current
)
adjustments
to
meet
specific
application requirements
.
The
types
of
pro
-
tection available
for
each model include the
following
,
which
are
illustrated
in
Figures
2.1
through
2.6
:
Types
1.2
Information
Light Emitting
Diodes
(
LED
'
s
)
on
the
face of
the
trip
unit
light
“
Red
”
to
indicate the
reason
for
an
automatic
trip
operation
.
The
battery
in
the
rating plug
maintains the
reason
for
trip
indication
following
an
automatic
trip
oper
-
ation
,
until the
“
TRIP
RESET
”
button is
pushed
.
The
“
Green
”
LED in
the lower
right
corner
“
blinks
”
to
indi
-
cate
the
trip
unit is
operating normally
.
The
battery
in
the
rating plug
is
“
OK
”
if
the
LED
lights
“
Green
”
when the
“
battery
check
”
button
next to
it
is
pushed
.
(
See
Section
6
.
)
.
Note
:
The
Digitrip
RMS
510
provides
all
of
its
protec
-
tion
functions
regardless
of
the
status
of
the
battery
.
The
battery
serves
only
to
maintain the indication
of
the
reason
for
automatic
trip
.
Refer
to
Figure
Protection
Long
Time
/
Instantaneous
Long
Time
/
Short
Time
Long
Time
/
Short
Time
/
Instantaneous
Long
Time
/
Instantaneous
/
Ground
Long
Time
/ Short
Time
/ Ground
Long
Time
/ Short
Time
/
Instantaneous
/
Ground
LI
*
2.1
LS
*
2.2
LSI
*
2.3
LIG
2.4
LSG
2.5
LSIG
2.6
Fig
.
1
Digitrip
RMS
510
Trip
Unit
Model
LSIG
with
Rating Plug
Effective
May
1997
Courtesy of NationalSwitchgear.com

I
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L
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29
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Page
3
Fig
.
2.1
Long
Time
/
Instantaneous Protection
(
LI
)
Fig
.
2.3
Long
Time
/ Short
Time
/
Instantaneous
Protection
(
LSI
)
Fig
.
2.2
Long
Time
/ Short
Time Protection
(
LS
)
Fig
.
2.4
Long
Time
/
lnstantaneous
/
Ground
Protection
(
LIG
)
F
:
T
'
N
Effective
May
1997
Courtesy of NationalSwitchgear.com

I
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L
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29
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885
B
Page
4
Fig
.
2.5
Long
Time
/
Short
Time
/
Ground
/
Protection
(
LSG
)
Fig
.
2.6
Long
Time
/
Short
Time
/
Instantaneous
/
Ground
Protection
(
LSIG
)
The
Digitrip
RMS
510
Trip
unit
provides
three basic
func
-
tions
:
Protection
,
Information
and
Testing
.
Atypical
trip
unit and
rating plug
are
illustrated
in
Fig
.
1
.
Individual
product
instruction
leaflets referenced
in
Section
9.0
illus
-
trate
typical Digitrip
RMS
Trip
Units
installed
in
specific
breakers
.
The
trip
unit
employs
the
Cutler
-
Hammer Inc
.
custom
designed integrated
circuit
S
|
.
iRE
+
chip
,
which includes
a
microcomputer
to
perform
its numeric and
logic
func
-
tions
.
The
principle
of
operation
is described
by
the block
diagram
shown
in
Fig
.
3
.
In
the
Digitrip
RMS
510
Trip
Unit
,
all
required
sensing
and
tripping
power
to
operate
its
protection
function
is
derived
from
the
current
sensors
in
the circuit breaker
.
The
secondary
currents
from
these
sensors
provide
the
correct
input
information for
the
protection
functions
,
as
well
as
tripping
power
,
whenever the circuit breaker is
carrying
current
.
These
current
signals
develop
analog
voltages
across
the
appropriate
calibrating
resistors
including
:
1
)
Phase
currents
2
)
Ground
current
(
when
supplied
)
3
)
Rating plug
The
resulting analog voltages
are
digitized by
the
custom
designed integrated
circuits
.
1.3
Testing
To
test
the
trip
unit
,
use
the
integral
test
panel
.
(
See Sec
-
tion
5.0
.
)
2.0
UL
LISTED DEVICES
Digitrip
RMS
510
Trip
Units
are
“
Listed
”
by
the Underwrit
-
ers
Laboratories
,
Inc
.
®
Under UL File
E
7819
,
for
use
in
types
DS
,
DSL
,
SPB
and
Series C
®
R
-
Frame circuit
breakers
.
3.0
PRINCIPLES
OF OPERATION
3.1
General
The
Digitrip
RMS
510
trip
unit is
designed
for
use
in
industrial circuit breaker environments where the ambient
temperatures
can
range
from
-
20
C
to
+
85
C
and
rarely
exceed
70
to
75
C
.
If
,
however
,
temperatures
in
the
neighborhood
of
the
trip
unit do exceed this
range
,
the
trip
unit
performance
may
be
degraded
.
In
order
to
insure
that the
tripping
function
is
not
compromised
due
to
an
over
-
temperature
condition
,
the
Digitrip
RMS
510
micro
-
computer
chip
has
a
built
-
in
over
-
temperature
protection
feature
,
factory
set to
trip
the breaker
if
the
chip
tempera
-
ture
exceeds
95
C
.
If
over
-
temperature
is the
reason
for
the
trip
,
the
Long Delay
Time
LED will
light
“
RED
”
.
Effective
May
1997
Courtesy of NationalSwitchgear.com

I
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29
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B
Page
5
[
LINE
/
UPPER
)
r
«
r
~
s
Flux
Transfer Shunt
Trip
(
FTST
)
T
)
°
r
JL
/
Direct
Trip
Actuator
IDTA
)
Input
Protection Function
Setting
By
Switches
and Pushbuttons
See Section
4
.
I
JL JL JL
t t
t
> >
>
•
i
Ana
log
Override
Trip
Circuit
See Section
3.5
.
FET
I
It
Lighted
RED
,
Indicates
Cause
Of
TRIP
[
Located
On
Front Panel
)
See Section
1.2
.
J
A
Trip
Unit
Operating
Indicator
(
Flashing
GREEN
Indicates
OK
)
See Section
3.2
.
Status
Integral
Test
Panel
See Section
5
.
S
3
«
4
I
4
bit
Current
Sensors
See
Section
8
.
r
*
i
4
*
HalU
-
ruO
Latch
Bridge
Circuits
Aux
CTs
Chip
/
Push Button
,
Lights
GREEN
If
Battery
OK
See Secti
F
Internal
Power
Supply
"
Custom
Designed
-
L
+
BatteryO
I
<
14
on
6
.
\
&
\
£
[
>
Raring Plug
^
1
Section
8
.
\
)
/
V
TTT
T
*
\
Integrated
Circuit
Rating
Plug
Connectors
Zone
Interlock
Circuitry
Section
(
LOAD
/
LOWER
I
Typical
Phase
Or
Ground
A
Sp
.
RE
+
Chip
T
IN
_
»
~
7
—
W
Calibration
Resistor
3.6
.
Auxilia
(
When
ry
Power Modu
Used
)
See Sec
jle
Input
tion
7
.
OUT
S
7
Digitrip
RMS
510
Block
Diagram
with
Breaker
Interface
Fig
.
3
The
microcomputer
,
in
cyclic
fashion
,
repeatedly
scans
the
voltage
values
across
each
calibrating
resistor and
enters
these values into its Random Access
Memory
(
RAM
)
.
These data
are
used
to
calculate
true
RMS
cur
-
rent
values
,
which
are
then
repeatedly
compared
with
the
protection
function
settings
and other
operating
data
stored
in
the Read
Only
Memory
(
ROM
)
.
The
software
program
then determines whether
to
initiate
protection
functions
,
including tripping
the breaker
through
the low
energy
trip
device
(
Flux
Transfer
Shunt
Trip
or
Direct
Trip
Actuator
)
in
the circuit breaker
.
3.3
Test Provisions
(
See Section
5.0
)
3.4
Discriminator
(
Making
Current
Release
)
(
For
Types
LS
and
LSG
trip
units
only
.
)
When the
Digitrip
RMS
510
Trip
Unit is
not
equipped
with
an
adjustable
instantaneous
protection
setting
,
i
.
e
.
,
types
LS
or
LSG
,
a
making
current
release
(
or
Discriminator
)
circuit is
provided
.
This circuit
will
prevent
the circuit
breaker
from
being
closed and latched
-
in
on a
faulted
cir
-
cuit
.
The
non
-
adjustable
release is
pre
-
set at
eleven
(
11
)
times the installed
rating plug
current
(
ln
)
.
The
making
current
release is enabled
only
for
the
first
ten
(
10
)
cycles
following
an
initial circuit breaker
closing
operation
,
provided
the load
current
exceeds
approxi
-
mately
10
%
of
the circuit breaker
frame
(
or
current
sen
-
sor
)
rating
.
Should
the load
current
through
the circuit
breaker
drop
to
less than the
10
%
value
,
the release
will
reset
.
The release
,
once
reset
,
will
remain enabled until
the load
current
passing through
the circuit breaker has
exceeded the
10
%
value
for
10
cycles
.
The
making
cur
-
rent
release
will
trip
the circuit breaker
instantaneously
.
In
the
event
the breaker is intended
to
close
(
but
not to
trip
out
again
)
into
a
circuit whose
current
could
initially
be
higher
than
11
x
ln
,
it
is
possible
to
make the Discrim
-
inator inactive
.
If
the breaker does close
onto
a
fully
rated
fault
current
,
when the
Discriminator
is
inactive
,
the
breaker
will
wait
for
the
full
short
-
time
delay setting
before
it
trips
.
The
Discriminator
(
making
current
release
)
can
be made inactive
by turning
the
“
OVER
-
RIDE
/
”
setting
switch
(
nearest
the bottom
edge
of
the
trip
unit
)
from
the
“
DIS
”
position
,
to
the
“
[
BLANK
]
”
position
.
(
See
Figs
.
2.2
and
2.5
.
)
3.2
Trip
and
Operation
Indicators
The LEDs
,
shown
in
Figs
.
1
and
2.1
-
2.6
,
on
the
face of
the
trip
unit
,
light
“
RED
”
to
indicate the
reason
for
any
automatic
trip operation
.
As indicated
in
Figs
.
2.1
-
2.6
,
each
LED
is
strategically
located
in
the related
segment
of
the time
-
current
curve
depicted
on
the
face of
the
trip
unit
.
The
reason
for
trip
is
identified
by
the
segment
of
the
time
-
current
curve
where the
LED
is
lighted
“
RED
”
.
Fol
-
lowing
an
automatic
trip operation
,
the back
-
up
battery
,
continues
to
supply
power
to
the LEDs
as
indicated
in
Figs
.
3
and
6
.
To check the
status
of
the
battery
,
see
Section
6
.
Push the
“
Trip
Reset
”
button shown
in
Fig
.
1
,
to turn
“
Off
’
the LEDs
following
a
trip operation
.
A
green
colored
LED
,
as
shown
in
Fig
.
1
,
indicates the
operational
status
of
the
trip
unit
.
Once
the load
current
through
the circuit breaker exceeds
approximately
10
%
of
the
frame
/
current
sensor
rating
,
the
green
LED will
flash
“
On
”
and
“
Off
’
once
each second
,
to
indicate the
trip
unit is
energized
and
operating properly
.
Note
:
If
the
LED
is
steadily
“
GREEN
”
,
i
.
e
.
not
flash
-
ing
,
the
trip
unit is
not
ready
.
FAT
'
N
Effective
May
1997
Courtesy of NationalSwitchgear.com

I
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L
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29
-
885
B
Page
6
Note
:
If
a
breaker
(
M
)
receives
a
Zone
Interlocking
signal
from
another breaker
(
F
)
,
but the
fault
current
level is less than the
trip
unit
setting
for
breaker
(
M
)
,
the
signal
from
the other breaker
(
F
)
will
not
cause
breaker
(
M
)
to
trip
.
Notes
:
1
This switch has
eight
(
8
)
positions
,
and
seven
(
7
)
of
them show
“
D
/
S
”
in
the window
,
while
ONLY
ONE
position
shows
“
[
BLANK
]
”
.
2
When the
"
OVERRIDE
/
”
window shows
“
[
BLANK
]
”
,
the
only
fast
-
acting high
short
-
circuit
protection
available is the
OVERRIDE
[
Fixed
Instantaneous
]
.
(
See
3.5
below
.
)
CAUTION
IF
ZONE INTERLOCKING
IS
NOT TO
BE
USED
(
I
.
E
.
STANDARD
TIME
-
DELAY
COORDINATION ONLY
IS
INTENDED
)
,
THE
ZONE INTERLOCKING
TERMINALS
MUST
BE
CONNECTED
WITH
JUMPER
WIRES
,
AS
SPECIFIED
ON
THE
CONNECTION
DIAGRAMS
FOR
YOUR
BREAKER
(
SEE SECTION
9.0
)
,
SO
THE TIME
-
DELAY
SETTINGS
WILL
PROVIDE
THE INTENDED
COORDINATION
.
For
an
example
of
how Zone
Selective
Interlocking
may
be used
,
See
Appendix
A
.
3.5
OVERRIDE
(
Fixed Instantaneous
)
(
For
Types
LS
And
LSG
Trip
Units
Only
)
When the
Digitrip
RMS
510
Trip
Unit is
not
equipped
with
an
adjustable
instantaneous
setting
,
i
.
e
.
,
types
LS
or
LSG
,
the Fixed Instantaneous
“
Override
”
analog
trip
cir
-
cuit is
automatically
pre
-
set to
a
value
no
greater
than the
short
-
time withstand
current
rating
of
the circuit breaker
in
which the
trip
unit is installed
.
Since
the
specific
values
vary
for different
circuit breaker
types
and
ratings
,
refer
to
time
-
current
curves
,
listed
in
Section
9
,
for
the values
applicable
to
your
breaker
.
If
breaker
trips
due
to
high
instantaneous
current
,
the
“
OVERRIDE
”
LED will
light
“
RED
”
.
4.0
PROTECTION
SETTINGS
4.1
General
Prior
to
placing
circuit breaker
in
operation
,
each
trip
unit
protection
setting
must
be
set to
the values
specified
by
the
engineer
responsible
for
the installation
.
The number
of
settings
that
must
be made is determined
by
the
pro
-
tector
model
supplied
as
illustrated
in
Figs
.
2.1
through
2.6
.
Each
setting
is made
with
a
rotary
switch
,
using
a
small screwdriver
.
The selected
setting
for
each
adjust
-
ment
appears
in
its
respective
rectangular viewing
win
-
dow
as
illustrated
in
Fig
.
1
.
The installed
rating plug
establishes the maximum
con
-
tinuous
current
rating
of
the circuit breaker
(
ln
)
.
Instanta
-
neous
and
ground
current
settings
are
defined
in
multiples
of
(
ln
)
.
To illustrate the
effect of
each
protection
curve
setting
,
simulated Time
-
Current
curves are
pictured
on
the
face
of
the
trip
unit
.
The
rotary
switch
to
make each
setting
is
located
nearest
that
portion
of
the simulated Time
-
Cur
-
rent
curve
it
controls
.
Should
an
automatic
“
trip
”
occur
(
as
a
result
of
the
current
exceeding
the
pre
-
selected value
)
,
the
LED in
the
appropriate
segment
of
the simulated
Time
-
Current
curve
will
light
“
RED
”
indicating
the
reason
for
“
trip
”
.
The available
settings
,
along
with
the illustrated
effect of
changing
the
settings
,
are
given
in
Figs
.
4.1
through
4.7
.
3.6
Zone
Interlocking
Zone
Selective
Interlocking
(
or
Zone
Interlocking
)
is
available
(
see
Fig
.
3
)
for
Digitrip
RMS
Trip
Units
having
Short
Delay
and
/
or
Ground
Fault
protection
.
Zone
Selec
-
tive
Interlocking
provides
the
fastest
possible
tripping
for
faults
within
the breaker
’
s zone
of
protection
,
and
yet
also
provides positive
coordination
among
all breakers
in
the
system
(
mains
,
ties
,
feeders
and downstream breakers
)
to
limit
the
outage
to
the
affected
part
of
the
system
only
.
When Zone
Interlocking
is enabled
,
a
fault
within
the
breaker
’
s zone
of
protection
will
cause
the
RMS DIG
-
ITRIP
trip
unit
to
:
Trip
the
affected
breaker
instantaneously
,
and
at
the
same
time
Send
a
signal
to
upstream
RMS DIGITRIP
trip
units
to
restrain
from
tripping
immedi
-
ately
.
The
restraining signal
causes
the
upstream
breakers
to
follow
their
set
coor
-
dination times
,
so
that
only
the minimum
service is
disrupted
,
while the
fault
is
cleared
in
the shortest time
possible
.
(
This
signal
requires
only
a
single
pair
of
wires
from
the
output
terminals
of
the downstream breaker
’
s
trip
unit
to
the
input
terminals
of
the
upstream
breaker
’
s
trip
unit
.
For
specific
instructions
see
the
applicable
connection dia
-
grams
for
your
breaker listed
in
Section
9.0
.
)
a
)
b
)
F
:
T
*
N
Effective
May
1997
Courtesy of NationalSwitchgear.com

I
.
L
.
29
-
885
B
Page
7
4.2
Long
Delay
Current
Setting
There
are
eight
(
8
)
available
Long Delay
Settings
,
as
illustrated
in
Fig
.
4.1
.
Each
setting
,
called
7
r
”
is
expressed
as a
multiple
(
ranging
from
.
5
to
1
)
of
the
rat
-
ing plug
current
(
ln
)
.
Note
:
“
lr
”
is also the basis
for
the
Short
-
Delay
Cur
-
rent
Setting
.
(
See Section
4.4
.
)
allow
for
the
fact
that the load circuit
temperature
is
already higher
than normal
,
due
to
the
prior
overload
condition
.
Each
time
an
overload condi
-
tion is
repeated
,
the
LTM
causes
the breaker
to
trip
in
a
time
progressively
earlier than the
“
Long
Delay
Time
Setting
”
.
When the load
current
returns to
normal
,
the
LTM
begins
to reset
;
and
after
about
10
minutes it has
reset
fully
,
so
that
next
Long
Delay
trip
time
will
again
be the
“
Set
-
ting
”
value
.
In
certain
applications
it
may
be desirable
to
dis
-
able the
LTM
function
.
The
LTM
function
can
be
disabled
by
(
first
opening
the
breaker
and
then
)
removing
the
Rating Plug
(
See
Figures
1
and
6
)
,
and
lastly moving
the
LTM
jumper
(
inside the
rat
-
ing plug cavity
,
See
figure
4.2
.
1
)
to
its
“
INAC
-
TIVE
”
connection
.
(
You
can
enable the
LTM
function
again
any
time
you
wish
by moving
the
LTM
jumper
back
to
its
original
“
ACTIVE
”
con
-
nection
.
)
'
r
Ir
Available
Settings
Long Delay
Setting
fr
CDx
in
2
.
5
,
.
6
,
.
7
,
.
8
,
.
85
,
.
9
,
.
95
,
1
=
'
r
0
In
Multiples
of
Rating Plug
Amperes
(
ln
)
Fig
.
4.1
Long
Delay
Current
Settings
4.3
Long
Delay
Time
Setting
There
are
eight
(
8
)
available
Long Delay
Time
Settings
,
as
illustrated
in
Fig
.
4.2
,
ranging
from
2
to
24
seconds
.
These
settings
are
the total
clearing
times when the
cur
-
rent
value
equals
six
(
6
)
times
lr
Rating
Plug
Cavity
Rating
Plug
Cavity
—
rvj
w
K
iOQ
©
0
V
0
00
N
.
\
0
©
0
©
V
©
©
@
8
CK
3
SCK
3
o
-
©
©
5
CK
2
SCK
2
o
-
SCK
1
:
$
KI
E
E
A
{
/
"
1
1
/
1
"
LTM
Inactive
"
Standard
from
Factory
"
LTM
Active
"
Fig
.
4.2
.
1
Long
Time
Memory
“
LTM
”
Jumper
The action
of
the
LTM
is
a
factor
to
consider
in
performing
multiple
Long
Delay
Time
tests
.
(
See
Section
5.4
.
)
2
)
There is
a
condition under which the
Long
Delay
Trip
LED
can
erroneously
indicate
a
LDT
has
occurred
,
even
though
the breaker is still closed
.
This
can
happen
when
an
overload
current
momentarily
exceeds the
Long
Delay
Current
Setting
,
lr
,
so
that the
Long
Delay
LED
flashes
“
RED
”
to
indicate the overload condition
.
Then
if
,
at
the
very
moment
when the
LED
is
“
ON
”
,
the
load
current
would then
suddenly
drop
to
a
value
less than
10
%
of
the breaker
frame
(
or
current
sensor
)
rating
,
the
trip
unit
stops
functioning
while the
“
4
bit Latch
Chip
”
(
See
Fig
.
3
)
is
set
and
the
LED
remains
Lighted
.
If
the
current
would
again
increase
to
a
value above the
Long
Delay
Current
Setting
,
lr
,
and then
return to
normal
,
the
Fig
.
4.2
Long
Delay
Time
Settings
Notes
:
1
)
In
addition
to
the standard
Long
Delay
Protection
Element
,
the
Digitrip
RMS
510
trip
unit also has
a
Long
Time
Memory
function
(
LTM
)
,
which
serves
to
protect
load circuits
from
the
effects of
repeated
overload conditions
.
If
a
breaker is
reclosed
soon
after
a
Long
Delay
Trip
,
and the
current
again
exceeds the
Long
Delay
Setting
,
ln
the
LTM
automatically
reduces the time
to
trip
,
to
FAT
'
N
Effective
May
1997
Courtesy of NationalSwitchgear.com

I
.
L
.
29
-
885
B
Page
8
LDT will
reset
itself
.
You
can
of
course
,
manually
clear the
LDT
(
or
any
other
trip
indication
)
at
any
time
,
by pushing
the
“
PUSH
to
RESET
”
button
.
(
See
Figure
1
.
)
range
from
2
to
6
times
(
ln
)
the
rating plug
value
,
and the
other
two
settings
are
“
M
1
”
or
“
M
2
”
times
(
ln
)
.
The values
that
“
M
1
”
and
“
M
2
”
have
depend
upon
the
type
of
circuit
breaker
,
and
are
specified
both
on
the
rating plug
label
(
see
Fig
.
6
)
,
and
on
the
applicable
Time
-
Current Curves
referenced
in
Section
9.0
.
4.4
Short
Delay
Current
Setting
There
are
eight
(
8
)
available
Short
Delay
Current Set
-
tings
,
as
illustrated
in
Fig
.
4.3
.
Six
settings
are
in
the
range
from
2
to
6
times
lr
and the other
two
settings
are
“
S
1
”
or
“
S
2
”
times
lr
.
(
REMEMBER
:
lr
is the
Long Delay
Current
Setting
)
.
The values that
“
S
1
”
and
“
S
2
”
have
depend
upon
the
type
of
circuit breaker
,
and
are
speci
-
fied
both
on
the
rating plug
label
(
see
Fig
.
6
)
,
and
on
the
applicable
Time
-
Current Curves referenced
in
Section
9.0
.
4.7
NO
Instantaneous
Current
Setting
For
types
LS
and
LSG
trip
units
,
please
see
Sections
3.4
Discriminator
(
Making
Current
Release
)
and
3.5
OVER
-
RIDE
(
Fixed Instantaneous
)
,
for
available
fast
-
acting high
short
-
circuit
protection
.
4.8
Ground
Fault
Current
Setting
The
eight
(
8
)
Ground
Fault
Current
Settings
are
labeled
with
the code letters
“
A
”
through
“
K
”
(
except
there
are no
“
G
”
or
“
I
”
settings
)
,
as
illustrated
in
Fig
.
4.6
.
In
general
,
the
specific
current
settings
range
from
0.25
to
1.0
times
(
ln
)
,
the
rating plug
value
,
but
cannot
exceed
1200
A
.
The
specific
Ground Current
Settings
for
each letter
are
listed
in
Table
1
and
on
the
applicable
Time
-
Current
curve
for
the breaker
.
4.5
Short
Delay
Time
Setting
As illustrated
in
Fig
.
4.4
,
there
are
two
different Short
Delay
curve
shapes
,
i
.
e
.
,
fixed
time
(
flat
)
or
l
2
t
response
.
The
shape
selected
depends
on
the
type
of
selective
coordination chosen
.
The
l
2
t
response
will
provide
a
longer
time
delay
in
the low
-
end
of
the short
delay
current
range
than
will
the
flat
response
.
[
i
\
i
.
A
Pl
\
N
Available
Settings
Sho
.
*
Delay
Time
I
i
0
Sec
.
0
-
1
n
2
,
2.5
,
3
.
4
,
5
,
6
,
S
,
,
S
2
In
Multiples
of
Long
Delay
Setting
Short
Delay
Setting
[
I
]
r
-
l
rl
1
PL
.
*
1
_
*
Or
)
PS
t
— —
i
— —
— —
J
Availabi
'
Settings
I
St
and
S
2
Values
are
Specified
on
Rating
Plug
1
,
.
2
.
.
3
,
.
*
.
5
m
l
"
}
•
i
LIT
:
Seconds
wi
h
Flat
Respom
e
Fig
.
4.3
Short
Delay
Current
Settings
Five
flat
(
.
1
,
.
2
,
.
3
,
.
4
,
.
5
sec
.
)
and three
l
2
t
(
.
1
*
,
.
3
*
,
.
5
*
sec
.
)
response
time
delay settings
are
available
.
The
l
2
t
response
settings
are
identified
by
the
suffix
asterisk
(
*
)
that
appears
in
the
viewing
window
.
The
l
2
t
response
is
applicable
to currents
less than
eight
(
8
)
times
lr
,
the
Long Delay
Setting
.
For
currents
greater
than
8
times
ln
the
l
2
t
response
reverts to
the
flat
response
.
Note
:
See
also
Section
3.6
,
Zone
Interlocking
,
above
.
l
2
t
Shape
Returns
to
Flat
Response
at
Currc
its
Higher
than
8
x
/
r
r
~
i
.
1
*
,
.
3
*
,
.
5
*
'
I
L
>
J
Seconds
with
l
2
t
Shape
"
*
"
ln
Viewing
Window
Indicates
lzt
Shape
8
x
/
r
4.6
Instantaneous
Current
Setting
There
are
eight
(
8
)
available Instantaneous
Current Set
-
tings
,
as
illustrated
in
Fig
.
4.5
.
Six
settings
are
in
the
Fig
.
4.4
Short
Delay
Time
Settings
Effective
May
1997
Courtesy of NationalSwitchgear.com

I
.
L
.
29
-
885
B
Page
9
TABLE
1
-
GROUND
FAULT
CURRENT
SETTINGS
r
,
I
'
-
H
n
Available
Settings
i
i
GROUND
FAULT
CURRENT
SETTINGS
(
AMPERES
)
/
,
I
*
t
i
2
,
2.5
,
3
,
4
.
5
,
6
,
M
„
M
2
In
Multiples
of
Rating
Plug
Amperes
(
ln
)
I
I
Setting
Inst
.
jTjxIn
A B
C
D E F H K
I
100
25
30 35
40 50 60
75
100
200
50 60 70 80
100 120
150
200
0
250
63
75
88 100
125 150 188 250
300
75
90 105 120 150 180 225
300
M
1
and
M
2
Values
are
Specified
on
Rating Plug
C
/
3
400
100 120
140 160
200
240
300
400
LU
a
:
600 150 180
210
240
300 360
450 600
LU
Fig
.
4.5
Instantaneous
Current
Settings
Note
:
For
Testing
Purposes
Only
:
When
using
an
external
single
phase
current
source
to test
low
level
ground
fault
current
settings
,
it is advisable
to
use
the
Auxiliary
Power Module
(
APM
) (
See
Fig
.
7
)
.
Espe
-
cially
when the
single
phase
current
is low
,
without
the
APM
it
may
appear
as
if
the
trip
unit does
not
respond
until the
current
is well above the
set
value
,
leading
the
tester to
believe there is
an error
in
the
trip
unit when there is
none
.
The
reason
this
occurs
is
that the
single
phase
test current
is
not
a
good
simulation
of
the normal three
phase
circuit
.
If
three
phase
current
had been
flowing
,
the
trip
unit would
actually
have
performed
correctly
.
Use the
APM
for
correct
trip
unit
performance
whenever
single
phase
tests
are
made
.
Q
_
630
158 189
221
252
315 378 473 630
<
800
200
240 280
320
400 480 600 800
O
1000
250
300 350
400 500 600 750
1000
z
>
1200
300 360
420 480 600 720 900
1200
CL
O
1250
312 375 438
500 625 750
938
1200
Z
F
1600 400 480 560 640 800 960
1200 1200
<
DC
2000 500 600 700 800 1000 1200 1200 1200
o
2400 600 720 840 960
1200 1200 1200 1200
LU
2500 625 750 875
1000 1200 1200 1200 1200
<
3000
/
3150
750 900 1050 1200 1200 1200 1200 1200
cn
z
3200
800 960
1120 1200 1200 1200 1200 1200
4000
1000 1200 1200 1200 1200 1200 1200 1200
5000 1200 1200 1200 1200 1200 1200 1200 1200
l
Tolerances
on
settings
are
±
10
%
of
values shown
,
i
Refer
to
Type
DS
,
type
SPB
or
Series C
R
-
Frame
supplemental
instruction
leaflets
given
in
Section
9
for
list
of
available
rating plugs
for
each
type
circuit
breaker
.
4.9
Ground
Fault Time
Delay
Setting
As illustrated
in
Fig
.
4.7
,
there
are
two
different Ground
Fault
curve
shapes
,
i
.
e
.
,
fixed
time
(
flat
)
or
l
2
t
response
.
The
shape
selected
depends
on
the
type
of
selective
coordination chosen
.
The
l
2
t
response
will
provide
a
longer
time
delay
in
the low
-
end
of
the
ground
fault
cur
-
rent
range
than
will
the
flat
response
.
Five
flat
(
.
1
,
.
2
,
.
3
,
.
4
,
.
5
sec
.
)
and three
l
2
t
(
.
1
*
,
.
3
*
,
.
5
*
sec
.
)
response
time
delay settings
are
available
.
The
l
2
t
response
settings
are
identified
by
the
suffix
asterisk
(
*
)
that
appears
in
the
setting viewing
window
.
The
l
2
t
response
is
applicable
to currents
less than
0.625
times
the
ampere
rating
of
the installed
rating plug
(
ln
)
.
For
cur
-
rents
greater
than
0.625
x
ln
the
l
2
t
response
reverts to
the
flat
response
.
Available
Settings
Gnd
-
Fault
Setting
[
E
]
xln
A
,
B
,
C
,
D
,
E
.
F
,
H
,
K
©
Specific
Values
Given
on
Circuit
Breaker
Time
-
Current
Curve
and
in
Table
1
L
/
'
v
’
Fig
.
4.6
Ground
Fault
Current
Settings
FAT
'
N
Effective
May
1997
Courtesy of NationalSwitchgear.com

I
.
L
.
29
-
885
B
Page
10
Available
'
Test
Amps
"
Settings
Breaker
Trips
At
6
T
and
GFT
\
CD
"
6
T
"
=
Phase
Current
Test
at
6
xln
and
TRIPS
breaker
;
"
1
,
2
,
3
,
8
or
10
"
x
lp
=
Phase
Current
Test
-
NO
breaker
TRIP
;
"
GFT
"
=
Ground
Current
Test
and
TRIPS
breaker
;
"
GF
"
=
Ground
Current
Test
-
NO
breaker
TRIP
.
See Section
5.4
.
3
for
inser
-
vice
test
trip
limitations
.
©
Push
,
then release
Trip
Reset
button
to
reset
Trip
Unit
.
Required
following
all
automatic
trip
and
test
operations
.
®
Push
,
then release
Test
button
to test
.
Test
operation
begins
with
release
of
pushbutton
.
\
\
\
\
Test
Amps
[
ST
]
®
X
Gnd
Fault
Time
PI
Sec
.
\
\
0
0
Test
(
D
O
Trip
Reset
l
©
O
l
I
Available
Settings
Unit
Status
i
1
,
.
2
,
.
3
,
.
4
,
.
5
Seconds
with
Flat
Response
i
l
Vs
.
Fig
.
5
Integral
Test Panel
(
Lower
Right
Comer of
Trip
Unit
)
I
Ft
Shape
Returns
to
Flat
Response
at
Approximately
0.625
ln
.
1
»
,
.
3
*
,
.
5
*
Seconds
with
l
2
t
Shape
CAUTION
In
Viewing
Window
^
^
.
j
Indicates
'
l
2
t
Shape
TESTING
A
CIRCUIT
BREAKER
UNDER
“
TRIP
CON
-
DITIONS
”
WHILE IT
IS
IN
SERVICE
AND
CARRYING
LOAD CURRENT
,
WHETHER
DONE
BY INTERNAL
OR
EXTERNAL
MEANS
,
IS
NOJ
RECOMMENDED
.
ANY
TRIPPING OPERATION
WILL
CAUSE DISRUP
-
TION OF
SERVICE
AND
POSSIBLE PERSONAL
INJURY
RESULTING
FROM
UNNECESSARY
SWITCHING
OF CONNECTED
EQUIPMENT
.
TESTING
OF
A
CIRCUIT
BREAKER THAT
RESULTS
IN THE
TRIPPING OF
THE
CIRCUIT
BREAKER
SHOULD
BE
DONE ONLY
WITH THE
CIRCUIT
BREAKER IN THE
“
TEST
”
OR
“
DISCONNECTED
”
CELL
POSITIONS
OR
WHILE THE
CIRCUIT
BREAKER
IS
ON
A
TEST
BENCH
.
To
preserve
the
primary
protection
function of
the
trip
unit
,
all
in
-
service
testing
under
“
Trip
”
or
“
No
-
Trip
”
condi
-
tions
are
only
performed
at
load
current
values
no
greater
than
50
%
of
the
Long Delay
Current
Setting
,
lr
.
Any
attempt
to
conduct
in
-
service
testing
when the load
cur
-
rent
exceeds
50
%
of
lr
,
will
not
be executed
by
the
trip
unit
.
Since
the
Digitrip
RMS
510
Trip
Unit is
completely
self
-
powered
using
energy
derived
from
the
current
sensors
installed
in
the circuit breaker
,
all
in
-
service
tests
con
-
ducted should be conducted
with
the
auxiliary
control
power
module
,
shown
in
Fig
.
7
,
plugged
into the
trip
unit
.
This action
will
avoid
difficulties
caused
by
load
current
levels that
are
too
low
to
operate
the
trip
unit
.
V
Fig
.
4.7
Ground
Fault Time
Delay
Settings
Note
:
See
also
Section
3.6
on
Zone
Interlocking
.
5.0
TEST PROCEDURES
5.1
General
DANGER
DO NOT
ATTEMPT
TO
INSTALL
,
TEST
OR PERFORM
MAINTENANCE
ON
EQUIPMENT
WHILE IT
IS
ENER
-
GIZED
.
DEATH
OR
SEVERE PERSONAL
INJURY
CAN
RESULT
FROM CONTACT
WITH
ENERGIZED
EQUIPMENT
.
DE
-
ENERGIZE
THE
CIRCUIT
AND
DISCONNECT
THE
CIRCUIT
BREAKER
BEFORE PERFORMING
MAINTE
-
NANCE OR
TESTS
.
As illustrated
in
Figs
.
1
and
5
,
an
integral
test
panel
is
provided
to test
the
Digitrip
RMS
510
Trip
Unit
.
Several
no
-
trip
settings
are
provided
to
check the
trip
unit
operation
without
actually tripping
the circuit breaker
.
Effective
May
1997
Courtesy of NationalSwitchgear.com