Eaton Digitrip RMS 910 User manual

Cutler
-
Hammer
I
.
L
.
29
-
889
A
Instructions
for
Digitrip
RMS
910
Trip
Unit
Table
of
Contents
Page
Information
Communicated
by
Digitrip
RMS
910
.
..
27
Waveform
Capture
Remote
CLOSing
and
TRIPping
of
Breakers
Remote
Resetting
of
the
Trip
Unit
References
Digitrip
RMS
Trip
Assemblies
Type
DS
Low
-
Voltage
AC
Power
Circuit
Breakers
.
.
28
Type
SPB
Systems
Pow
-
R
Series
C
®
R
-
Frame
Molded
Case
Ckt
.
Breakers
.
.
.
29
Assemblies
Electronic
Monitors
INCOM
®
and
IMPACC
®
Communications
Lists
of
Figures
,
Tables
,
and
Appendices
5.6
5.7
27
1.0
General
Description
-
RMS
910
Trip
Unit
System
.
.
.
2
1.1
Basic
RMS
910
Trip
Unit
1.1
.
1
Operational
Status
and
TRIP
Indicators
1.1
.
2
General
Over
-
Current
Protection
1.1
.
3
Discriminator
(
Making
Current
Release
)
1.1
.
4
OverRIDe
(
Fixed
Instantaneous
)
TRIP
1.1
.
5
Zone
Interlocking
1.2
Four
-
Character
Information
Display
Window
..
.
1.2
.
1
Values
Displayed
During
Normal
Service
1.2
.
1.1
Instrumentation
-
Current
Values
1.2
.
1.2
Instrumentation
-
Voltage
Values
1.2
.
1.3
Instrumentation
-
Power
,
Power
Factor
and
Energy
Values
1.2
.
1.4
Harmonics
[
THD
]
1.2
.
2
Messages
Displayed
After
ALARM
or
TRIP
.
..
.
1.2
.
2.1
ROM
Error
See
I
.
L
1.3
Frame
Rating
,
Sensor
Rating
(
where
applicable
)
and
Rating
Plugs
1.4
Power
/
Relay
Module
1.5
Potential
Transformer
Module
1.6
Auxiliary
Power
Module
2.0
UL
Listed
Devices
3.0
Protection
Settings
3.1
General
3.2
Long
Delay
Current
Setting
3.3
Long
Delay
Time
Setting
3.4
Short
Delay
Current
Setting
3.5
Short
Delay
Time
Setting
3.6
Instantaneous
Current
Setting
3.7
NO
Instantaneous
Current
Setting
3.8
Ground
Fault
Current
Setting
3.9
Ground
Fault
Time
Delay
Setting
4.0
Test
Procedures
4.1
General
4.2
When
to
Test
4.3
Testing
Provisions
4.4
Conducting
Tests
4.4
.
1
Not
Tripping
the
Breaker
4.4
.
2
Tripping
the
Breaker
4.5
Testing
the
Back
-
up
Battery
-
Inside
the
Rating
Plug
22
4.5
.
1
Back
-
up
Battery
Check
4.5
.
2
Replacing
the
Back
-
up
Battery
5.0
Communications
5.1
Trip
Unit
Address
and
Baud
Rate
5.2
Remote
Master
Computer
5.3
Assemblies
Electronic
Monitor
(
AEM
)
.
.
5.4
Both
Remote
Master
Computer
and
AEM
5.5
INCOM
®
Network
Interconnections
5.8
27
2
5.9
28
2
6.0
28
4
6.1
28
4
6.2
7
6.3
29
7
6.4
7
6.5
29
7
6.6
29
8
29
8
9
WARNING
11
12
13
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
INC
.
IS
NOT
LIABLE
FOR
THE
MISAPPLICATION
OR
MISIN
-
STALLATION
OF
ITS
PRODUCTS
.
13
14
15
16
16
17
17
17
17
18
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
all
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
.
Send
to
Telephone
FAX
Number
Number
-
(
442
)
^
037
6020
-
-
-
(
4
t
2
y
937
-
6396
(
44
2
)
037
-
6029
-
'
'
-
(
412
)
937
-
6396
-
(
44
-
2
^
93
^
6490
-
.
~
-
18
18
18
18
18
19
19
19
20
20
21
21
Circuit
Breaker
Type
DS
/
DSL
SPB
Series
C
R
-
Frame
Call
22
22
22
23
26
26
(
412
)
937
-
6010
27
27
E
:
T
'
N
Effective
May
1997
Courtesy of store.ips.us

I
.
L
.
29
-
889
A
Page
2
1.0
GENERAL
DESCRIPTION
-
DIGITRIP
RMS
910
TRIP
UNIT
carrying
current
.
These
signals
develop
analog
voltages
across
the
appropriate
sensing
resistors
including
:
1
)
Phase
currents
2
)
Ground
current
or
Neutral
current
(
when
supplied
)
3
)
Rating
plug
4
)
Phase
Voltages
The
resulting
analog
voltages
are
digitized
by
the
custom
designed
integrated
circuits
.
The
micro
-
computer
,
in
cyclic
fashion
,
repeatedly
scans
the
voltage
values
across
each
sensing
resistor
and
enters
these
values
into
its
Random
Access
Memory
(
RAM
)
.
These
data
are
used
to
calculate
true
RMS
current
values
,
which
are
then
repeatedly
compared
with
the
protection
function
settings
and
other
operating
data
stored
in
the
memory
.
The
soft
-
ware
program
then
determines
whether
to
initiate
protec
-
tion
functions
,
including
tripping
the
breaker
through
the
low
energy
trip
device
(
Flux
Transfer
Shunt
Trip
or
Direct
Trip
Actuator
)
in
the
circuit
breaker
.
1.1
Basic
Digitrip
RMS
910
Trip
Unit
The
Digitrip
RMS
910
,
illustrated
in
Fig
.
1
,
is
a
Trip
Unit
,
suitable
for
use
in
types
DS
and
DSL
Low
-
Voltage
AC
power
circuit
breakers
and
type
SPB
Systems
Pow
-
R
cir
-
cuit
breakers
and
Series
C
R
-
Frame
molded
case
circuit
breakers
.
The
Digitrip
RMS
910
Trip
Unit
provides
five
basic
functions
:
Function
Protection
Information
Monitors
:
Current
Voltage
Power
,
Power
Factor
and
Energy
Harmonics
and
[
THD
]
Testing
Communications
Remote
CLOSE
/
OPEN
Control
5.8
Digitrip
RMS
910
provides
true
RMS
current
sensing
for
proper
correlation
with
thermal
characteristics
of
conduc
-
tors
and
equipment
.
Interchangeable
rating
plugs
are
provided
to
establish
the
continuous
current
rating
of
each
circuit
breaker
.
The
Digitrip
RMS
910
Trip
Unit
is
designed
for
use
in
industrial
circuit
breaker
environ
-
ments
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
910
microcomputer
chip
has
a
built
-
in
over
-
temperature
protection
feature
,
factory
set
to
trip
the
breaker
if
the
chip
temperature
exceeds
95
C
.
If
over
-
temperature
is
the
reason
for
the
trip
,
the
Long
Delay
Time
LED
will
light
“
RED
"
,
and
the
word
“
TEMP
”
will
appear
in
the
display
window
.
The
Trip
Unit
employs
the
Cutler
-
Hammer
Inc
.
custom
designed
integrated
circuit
SpRE
+
chip
,
which
includes
a
micro
-
computer
to
perform
its
numeric
and
logic
functions
.
The
principle
of
operation
is
described
by
the
block
diagram
shown
in
Fig
.
2
.
In
the
Digitrip
RMS
910
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
protector
functions
,
as
well
as
tripping
power
,
whenever
the
circuit
breaker
is
Section
1.1
.
2
-
1.1
.
5
and
3
1.1
.
1
and
1.2
1.2
.
1
1.2
.
1.1
1.2
.
1.2
1.2
.
1.3
1.2
.
1.4
and
5.7
4
1.4
and
5
1.1
.
1
Operational
Status
and
Protection
TRIP
Indicators
The
“
Green
”
Light
Emitting
Diode
(
LED
)
in
the
lower
right
corner
of
the
Trip
Unit
(
Fig
.
1
)
“
blinks
”
once
each
second
to
indicate
the
Trip
Unit
is
operating
normally
.
Note
:
If
the
LED
is
steadily
“
GREEN
”
,
i
.
e
.
not
blink
-
ing
,
the
Trip
Unit
is
not
ready
.
Check
the
120
VAC
control
power
to
the
Power
/
Relay
Module
,
if
the
LED
is
not
blinking
.
(
See
Section
1.4
.
)
The
LEDs
,
shown
in
Figs
.
1
and
3.1
thru
3.6
on
the
face
of
the
Trip
Unit
,
light
“
RED
”
to
indicate
the
reason
for
any
automatic
trip
operation
.
As
indicated
in
Figs
.
3.1
-
3.6
,
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
”
,
is
also
identified
on
the
Display
.
Following
an
automatic
pro
-
tection
trip
operation
,
the
external
control
power
to
the
Power
/
Relay
Module
(
see
Section
1.4
)
will
maintain
the
LED
“
RED
”
and
will
continue
to
send
a
TRIP
signal
to
LOCKOUT
the
circuit
breaker
until
the
Trip
Unit
is
RESET
.
The
Digitrip
RMS
910
Trip
Unit
can
be
RESET
in
two
ways
:
•
either
press
and
release
the
“
TRIP
RESET
”
button
(
See
Fig
.
1
lower
right
corner
just
above
the
“
UNIT
STATUS
”
LED
.
)
,
or
•
by
the
“
Trip
Reset
”
remote
communications
function
.
(
See
Section
5.9
.
)
E
^
T
*
N
Effective
May
1997
Courtesy of store.ips.us

I
.
L
.
29
-
889
A
Page
3
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Fig
.
2
RMS
Digitrip
910
Trip
Unit
-
Block
Diagram
FiT
-
N
Effective
May
1997
Courtesy of store.ips.us

I
.
L
.
29
-
889
A
Page
4
In
the
event
that
control
power
is
lost
,
the
back
-
up
battery
in
the
Rating
Plug
(
see
Section
1.3
and
Figs
.
1
and
4
)
continues
to
supply
power
to
the
LEDs
.
To
check
the
sta
-
tus
of
the
battery
,
see
Section
4.5
.
Note
:
The
Digitrip
RMS
910
performs
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
.
Press
and
release
the
“
TRIP
RESET
”
push
-
button
shown
in
Fig
.
1
,
to
turn
“
Off
”
the
LEDs
following
a
trip
operation
.
TROL
POWER
REMAINS
AVAILABLE
TO
THE
POWER
/
RELAY
MODULE
.
THE
TRIP
UNIT
MUST
BE
RESET
.
BEFORE
THE
CIRCUIT
BREAKER
CAN
BE
CLOSED
AGAIN
.
THE
RESET
CAN
BE
ACCOM
-
PLISHED
EITHER
LOCALLY
BY
PRESSING
AND
RELEASING
THE
"
TRIPRESET
’
PUSH
BUTTON
(
SEE
FIG
.
1
)
,
OR
REMOTELY
BY
THE
IMPACC
SYSTEM
.
(
SEE
SECTION
5.9
.
)
After
an
over
-
current
trip
operation
,
the
following
informa
-
tion
is
stored
in
the
Trip
Unit
memory
:
•
the
cause
of
trip
,
•
the
values
of
currents
at
time
of
trip
,
•
the
time
when
the
trip
operation
occurred
,
•
the
total
number
of
times
the
Trip
Unit
has
tripped
the
breaker
electronically
,
(
does
not
count
shunt
trip
or
manual
operations
)
If
the
120
VAC
control
power
remains
available
to
the
Power
/
Relay
Module
,
this
information
can
be
viewed
by
INCOM
®
/
IMPACC
®
.
(
See
Section
5.6
.
)
Therefore
,
users
may
want
to
use
an
uninterruptable
power
supply
for
the
control
power
to
the
power
relay
module
.
1.1
.
2
General
Over
-
Current
Protection
The
Digitrip
RMS
910
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
.
The
Digitrip
RMS
910
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
)
settings
(
see
Section
3
)
to
meet
specific
application
requirements
.
The
protection
available
for
each
type
is
summarized
in
Table
1
,
and
illustrated
in
Figures
3.1
through
3.6
:
Protection
Functions
Long
Time
/
Instantaneous
Long
Time
/
Short
Time
Long
Time
/
Short
Time
/
Instantaneous
LSI
*
3.3
Long
Time
/
Instantaneous
/
Ground
Long
Time
/
Short
Time
/
Ground
Long
Time
/
Short
Time
/
Instantaneous
/
Ground
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
PROTECTION
.
Refer
to
the
National
Electric
Code
for
appropriate
application
of
4
-
pole
breakers
.
1.1
.
3
Discriminator
(
High
Initial
Current
Release
)
(
For
Types
LS
and
LSG
Trip
Units
only
)
When
the
Digitrip
RMS
910
Trip
Unit
is
not
equipped
with
an
adjustable
instantaneous
protection
setting
,
i
.
e
.
types
LS
or
LSG
,
a
Discriminator
circuit
(
or
high
initial
current
release
)
is
provided
.
The
non
-
adjustable
release
is
pre
-
set
at
eleven
(
11
)
times
the
installed
rating
plug
cur
-
rent
(
ln
)
.
The
Discriminator
is
enabled
for
approximately
ten
(
10
)
cycles
following
the
initial
current
flow
through
the
circuit
breaker
,
provided
the
load
current
exceeds
approximately
10
%
of
the
circuit
breaker
frame
(
or
cur
-
rent
sensor
)
rating
.
Whenever
the
load
current
falls
below
10
%
the
discriminator
is
rearmed
.
The
release
,
once
rearmed
will
remain
enabled
until
the
load
current
pass
-
ing
through
the
circuit
breaker
has
exceeded
the
10
%
value
for
10
cycles
.
Whenever
the
Discriminator
trips
the
circuit
breaker
,
the
“
OVERRIDE
/
DIS
”
LED
will
light
“
RED
”
,
and
the
Display
will
read
“
DISC
”
.
In
the
event
the
breaker
is
not
intended
to
trip
out
on
a
circuit
whose
current
could
initially
be
higher
than
1 1
x
1
it
is
possible
to
make
the
Discriminator
inactive
.
Type
Figure
LI
*
3.1
LS
*
3.2
LIG
3.4
LSG
3.5
LSIG
3.6
NOTICE
AFTER
EACH
TRIP
OPERATION
(
WHETHER
DUE
TO
OVERCURRENT
PROTECTION
OR
REMOTE
CON
-
TROL
)
THE
AUTOMATIC
LOC
/
COU
7
-
AFTER
-
TRIP
FEATURE
OF
THE
DIGITRIP
RMS
910
TRIP
UNIT
MAINTAINS
THE
CIRCUIT
BREAKER
IN
A
“
TRIP
-
FREE
”
CONDITION
,
PROVIDED
120
VAC
CON
-
rv
F
:
T
"
N
Effective
May
1997
Courtesy of store.ips.us

11.29
-
889
A
Page
5
TABLE
1
-
DIGITRIP
RMS
910
PROTECTION
FUNCTIONS
RMS
DIGITRIP
910
Trip
Unit
TYPE
S
SS
999
2
3
3
3
3
L
L
L
I
S
S
s
s
s
9
9
9
5
6
3
3
3
L
L
L
S
S
4
1
Refer
to
I
.
L
.
Section
Number
Catalog
Number
I
GG
G
Suffix
Number
91
92
93
94
95
96
Instruction
Leaflet
No
.
I
.
L
.
29
-
889
Long
-
Time
Delay
Protection
Adj
.
Current
Setting
(
Pick
-
up
)
Adj
.
Time
Delay
Setting
Long
Time
Memory
XXX
XXX
XXX
XXX
XXX
XXX
3.2
3.3
3.3
High
Load
Alarm
ALARM
Indication
a t
Trip
Unit
Remote
ALARM
Signal
Contacts
Table
3
XXX
XXX
XXX
XXX
1.3
Short
-
Time
Delay
Protection
Ad
|
.
Current
Setting
(
Pick
-
up
)
Adj
Time
Delay
Setting
Opt
"
I
squared
T
'
Curve
Shape
Opt
.
Zone
Interlocking
XX
XX
XX
XX
X
X
X
X
X
X
X
X
3.4
3.5
3.5
1.1
.
5
Instantaneous
Protection
Adj
.
Current
Setting
(
Pick
-
up
)
DISCnminator
(
11
x
)
IN
or
OUT
OverRIDe
(
>
short
time
current
rating
)
XX
X
X
3.6
XX
1.1
.
3
1.1
.
4
1
1
1
1
1
1
Neutral
Current
Protection
1.1
.
1
n
n
n
Ground
Fault
Protection
Adj
Current
Setting
(
Pick
-
up
)
Adj
.
Time
Delay
Setting
Opt
"
I
squared
T
Curve
Shape
Opt
.
Zone
Interlocking
Ground
Fault
Time
Memory
XXX
XXX
XXX
XXX
XXX
3.8
3.9
3.9
1.1
.
5
3.9
XXX
Trip
Unit
Over
-
Temp
.
TRIP
XXX
1.1
Auto
Lock
-
Out
after
TRIP
1.1
.
2
c
.
r
c
,
r
c
.
r
c
,
r
c
,
r
c
,
r
LED
Indicators
on
TRIP
Unit
:
Trip
Unit
Status
(
OK
=
Blinking
)
Long
-
Time
Delay
TRIP
Short
-
Time
Delay
TRIP
XXX
XXX
X
X
XXX
XXX
X
X
1.1
.
2
1.1
.
2
1.1
.
2
X
1.1
.
2
1.1
.
2
1.1
.
2
INStantaneous
TRIP
OverRIDe
/
DISCriminator
TRIP
Ground
Fault
TRIP
X
X
X
XX
XXX
XXX
4.5
Rating
Plug
Back
-
up
Battery
Status
XXX
XXX
4
Integral
Test
Provision
XXX
POWER
/
RELAY
MODULE
Output
Signal
Contacts
:
XXX
XXX
1.4
XXX
XXX
Long
-
Time
Delay
TRIP
1.4
XXX
Short
-
Circuit
TRIP
(
includes
any
of
:
)
•
Short
-
Time
Delay
TRIP
•
INStantaneous
TRIP
•
OverRIDe
/
DISCriminator
TRIP
XXX
1.4
XXX
1.4
Ground
Fault
TRIP
Neutral
Current
ALARM
High
LoaD
ALARM
XXX
XXX
1.4
XXX
1.4
LEGEND
:
x
=
Function
included
for
this
trip
unit
c
=
120
VAC
Control
Power
required
to
maintain
Lockout
n
=
Circuit
Breaker
must
be
equipped
for
Neutral
Protection
r
=
Trip
Unit
can
be
re
-
set
Remotely
via
INCOM
/
IMPACC
*
=
“
DISCriminator
”
is
also
called
“
Making
Current
Release
”
1
=
n
/
a
for
Type
DS
Breakers
“
blank
"
=
Function
n
/
a
for
this
trip
unit
Fig
.
3.2
Digitrip
RMS
910
Type
LS
F
;
T
*
N
Effective
May
1997
Courtesy of store.ips.us

I
.
L
.
29
-
889
A
Page
6
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ins
*
Fig
.
3.5
Digitrip
RMS
910
Type
LSG
Fig
.
3.3
Digitrip
RMS
910
Type
LSI
Fig
.
3.6
Digitrip
RMS
910
Type
LSIG
Fig
.
3.4
Digitrip
RMS
910
Type
LIG
F
:
T
>
N
Effective
May
1997
Courtesy of store.ips.us

I
.
L
.
29
-
889
A
Page
7
This
signal
requires
that
only
a
single
pair
of
wires
be
connected
from
the
interlock
output
terminals
of
the
downstream
breaker
’
s
Trip
Unit
,
to
the
interlock
input
ter
-
minals
of
the
upstream
breaker
’
s
Trip
Unit
.
For
specific
instructions
see
the
applicable
connection
diagrams
for
your
breaker
listed
in
Section
6
.
Note
:
If
a
breaker
(
M
)
receives
a
Zone
Interlocking
signal
from
another
breaker
(
F
)
that
is
tripping
,
but
the
fault
current
level
is
less
than
the
setting
for
breaker
(
M
)
,
the
presence
of
the
Zone
Interlocking
signal
from
the
other
breaker
(
F
)
can
not
cause
breaker
(
M
)
to
trip
.
If
a
circuit
breaker
would
close
onto
a
high
short
-
circuit
current
,
when
the
Discriminator
is
inactive
,
type
LS
or
LSG
Trip
Units
will
rely
on
the
short
-
time
delay
function
before
tripping
.
If
the
fault
current
exceeds
the
short
-
time
withstand
current
capability
of
the
circuit
breaker
,
the
OverRIDe
protection
function
will
trip
the
breaker
without
delay
.
(
See
Section
1.1
.
4
.
)
Also
,
please
see
Section
1.1
.
5
for
other
exceptions
when
Zone
Interlocking
is
employed
.
The
Discriminator
(
high
initial
current
release
)
can
be
made
inactive
by
turning
the
“
OVERRIDE
/
”
setting
switch
(
nearest
the
bottom
edge
of
the
Trip
Unit
)
from
the
“
DIS
”
position
,
to
the
“
[
blank
]
”
position
.
(
See
Figs
.
3.2
and
3.5
)
Notes
:
This
switch
has
eight
(
8
)
positions
,
and
seven
(
7
)
of
the
positions
show
“
DIS
”
in
the
window
,
ONLY
ONE
position
shows
“
[
blank
]
”
.
When
the
“
OVERRIDE
/
”
window
shows
“
[
blank
]
”
,
the
only
fast
-
acting
high
short
-
circuit
protection
avail
-
able
is
the
OVERRIDE
(
Fixed
Instantaneous
)
.
(
See
Section
1.1
.
4
.
)
1.1
.
4
OVERRIDE
(
Fixed
Instantaneous
)
Each
Digitrip
RMS
910
Trip
Unit
has
a
Fixed
Instanta
-
neous
“
Override
"
analog
trip
circuit
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
6
,
for
the
values
applicable
to
your
breaker
.
If
breaker
trips
due
to
high
instantaneous
current
,
the
“
OVERRIDE
/
”
LED
will
light
“
RED
”
,
and
the
display
will
read
“
ORID
”
.
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
6
)
,
SO
THE
TIME
-
DELAY
SETTINGS
WILL
PROVIDE
THE
INTENDED
COORDINATION
.
For
examples
of
how
Zone
Selective
Interlocking
may
be
used
,
See
Appendix
A
.
1.2
Four
Character
Information
Display
Window
The
four
-
digit
alpha
-
numeric
display
window
,
illustrated
in
Figs
.
1
and
2
,
serves
two
basic
purposes
:
instrumenta
-
tion
and
mode
of
trip
and
trouble
indication
.
The
informa
-
tion
displayed
in
the
window
is
listed
in
Tables
2
and
3
.
1.2
.
1
Values
Displayed
During
Normal
Service
The
alpha
-
numeric
display
window
provides
informational
values
under
normal
service
conditions
and
coded
mes
-
sages
after
an
alarm
condition
or
after
an
over
-
current
trip
operation
.
The
twelve
Green
LEDs
below
the
display
window
indicate
which
value
of
current
,
voltage
,
power
,
power
factor
,
energy
,
or
Total
Harmonic
Distortion
(
THD
)
is
being
displayed
.
The
value
in
the
display
window
indi
-
cates
the
present
value
of
the
parameter
whose
LED
is
lighted
“
Green
"
.
In
Fig
.
1
,
the
first
four
“
Green
”
LEDs
identify
which
current
(
kA
)
value
is
being
displayed
,
i
.
e
.
phase
A
current
(
lA
)
,
phase
B
current
(
lB
)
,
phase
C
cur
-
rent
(
lc
)
,
ground
current
(
lG
)
,
or
current
in
the
fourth
pole
(
neutral
)(
lD
)
.
The
press
and
release
operation
of
the
“
Step
”
push
-
button
will
step
next
to
the
Green
LEDs
that
identify
the
breaker
’
s
phase
to
phase
voltages
being
dis
-
played
;
i
.
e
.
,
(
VAB
)
,
(
VBC
)
,
(
VCA
)
.
Values
are
in
volts
RMS
.
1.1
.
5
Zone
Interlocking
Zone
Selective
Interlocking
(
or
Zone
Interlocking
)
is
avail
-
able
(
see
Fig
.
2
)
for
Digitrip
RMS
Trip
Units
having
Short
Delay
and
/
or
Ground
Fault
protection
.
Zone
Selective
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
Trip
Unit
to
:
•
Trip
the
affected
breaker
instantaneously
,
and
•
Send
a
signal
to
upstream
RMS
Digitrip
Trip
Units
to
restrain
from
tripping
immediately
.
The
restraining
signal
causes
the
upstream
breakers
to
follow
their
set
coordination
times
,
so
that
only
the
minimum
ser
-
vice
is
disrupted
,
while
the
fault
is
cleared
in
the
shortest
time
possible
.
E
:
T
*
N
Effective
May
1997
Courtesy of store.ips.us

I
.
L
.
29
-
889
A
Page
8
A
repeat
press
and
release
of
“
Step
”
pushbutton
will
pro
-
ceed
to
the
four
Green
LEDs
that
identify
Peak
Power
Demand
(
MW
)
,
Present
Power
Demand
(
MW
)
,
Energy
Demand
(
MWh
)
,
and
Power
Factor
(
PF
)
.
The
next
press
and
release
of
“
Step
”
push
-
button
will
show
the
(
THD
)
for
phase
(
lA
)
current
.
Notice
that
both
the
green
LEDs
(
THD
)
and
(
lA
)
are
illuminated
.
Repeating
“
Step
”
push
-
button
operation
will
show
(
THD
)
values
for
(
lB
)
and
(
lc
)
currents
.
Repeating
press
and
release
one
more
time
will
sequence
back
from
the
(
THD
)
of
(
lc
)
to
the
(
kA
)
cur
-
rent
of
(
lA
)
.
See
Section
1.2
.
1.4
for
displaying
per
har
-
monic
data
.
TABLE
2
-
DIGITRIP
RMS
910
INFORMATION
FUNCTIONS
Trip
Unit
TYPE
RMS
DIGITRIP
910
SS
S
9
99
2
3
3
3
3
LLL
I
S
S
ss
s
9
9
9
4
5
6
3
3
3
LLL
I
S
S
G
G
l
1
Refer
to
I
.
L
Section
Number
Catalog
Number
i
G
Suffix
Number
91
92
93
94
95
96
Instruction
Leaflet
No
.
I
.
L
29
-
889
4
-
Character
LED
Display
XXX
XXX
12
Current
Values
:
1.2
.
1.1
Phase
A
Current
[
la
]
(
kA
)
Phase
B
Current
[
lb
]
(
kA
)
Phase
C
Current
[
lc
]
(
kA
)
XXX
XXX
XXX
XXX
XXX
XXX
Ground
Current
[
Ig
]
(
kA
)
Neutral
Current
[
Id
]
(
kA
)
XXX
1.2
.
1.1
Instrumentation
-
Current
Values
During
the
normal
service
conditions
,
with
the
circuit
breaker
closed
,
the
Digitrip
910
serves
as
an
ammeter
,
displaying
the
individual
phase
currents
(
lA
,
lB
,
lc
)
and
ground
current
(
lG
)
or
the
fourth
pole
(
neutral
)
current
(
lD
)
,
provided
the
circuit
breaker
is
set
up
for
ground
or
fourth
pole
protection
.
Current
values
are
displayed
in
kA
.
The
value
displayed
is
current
in
the
pole
(
or
ground
)
indi
-
cated
by
the
“
Green
”
LED
that
is
turned
“
On
”
.
Press
and
release
the
(
Black
)
“
STEP
”
push
-
button
to
view
the
val
-
ues
of
current
in
the
other
phases
.
(
See
Fig
.
1
.
)
The
range
,
accuracy
and
wave
shape
parameters
for
current
values
displayed
are
:
RANGE
:
0
to
9.999
kA
if
ln
x
<
1000
A
Oto
99.99
kA
if
ln
>
1000
A
ASSUMES
:
5
%
<
Current
<
100
%
of
Frame
Rating
for
Series
C
®
R
-
Frame
or
Type
SPB
circuit
breaker
.
or
5
%
<
Current
<
100
%
of
[
Current
]
Sensor
Rating
for
Type
DS
circuit
breaker
.
ACCURACY
:
±
±
2
%
of
Frame
Rating
for
Series
C
®
R
-
Frame
or
Type
SPB
circuit
breakers
,
or
±
±
2
%
of
[
Current
]
Sensor
Rating
for
Type
DS
circuit
breaker
.
1.2
1.1
n
n
n
1.2
.
1.2
Voltage
Values
:
Phase
[
VAB
]
(
volts
)
Phase
[
VBC
]
(
volts
)
Phase
[
VCA
]
(
volts
)
XXX
XXX
XXX
XXX
XXX
XXX
Power
.
Power
Factor
and
Energy
Values
:
1
2.1
.
3
XXX
XXX
XXX
XXX
XXX
XXX
Peak
Power
Demand
(
MW
)
Present
Power
Demand
(
MW
)
Reverse
Power
Flow
XXX
XXX
1
2.1
3
Power
Factor
XXX
XXX
XXX
XXX
Energy
Consumption
(
MWh
)
Reverse
Energy
Consumption
1.2
.
1
3
Harmonic
Currents
:
1.2
1
4
Total
Harmonic
Distortion
[
THD
]
Per
Harmonic
XXX
XXX
XXX
XXX
TABLE
3
Local
Messages
:
DISC
=
Discriminator
Trip
EXTT
=
EXTernal
Trip
GNDT
=
GrouND
Trip
X
X
XXX
XXX
XXX
XXX
X
X
XXX
XXX
HILD
=
High
LoaD
Alarm
INST
=
INStantaneous
Trip
LDPU
=
Long
-
Time
Delay
Pick
-
U p
X
X
XXX
XXX
XXX
XXX
XXX
LDT
=
Long
-
Time
Delay
Trip
NPOW
=
Negative
POWer
flow
ORID
=
OverRIDe
Trip
11
1
11
1
XXX
XXX
XX
XXX
XXX
XX
ORNG
=
OverRaNGe
Trip
PLUG
=
Rating
PLUG
Problem
SDT
=
Short
-
Time
Delay
Trip
XXX
XXX
TEMP
=
OverTEMPerature
Trip
TEST
=
TEST
ready
t o
begin
XXX
XXX
TABLE
3
LEGEND
:
X
=
Function
Included
n
=
Circuit
Breaker
must
be
equipped
for
Neutral
Protection
1
=
n
/
a
for
Type
DS
Breakers
1.2
.
1.2
Instrumentation
-
Voltage
Values
During
the
normal
service
conditions
,
with
the
circuit
breaker
closed
,
the
Digitrip
910
serves
as
a
voltmeter
displaying
the
breaker
’
s
phase
to
phase
voltages
(
VAB
)
,
(
VBC
)
,
and
(
VCA
)
.
The
range
and
accuracy
for
the
voltage
values
displayed
are
:
RANGE
:
100
to
600
VAC
RMS
-
3
Phase
ACCURACY
:
±
2
%
of
Full
Range
Volts
Effective
May
1997
Courtesy of store.ips.us

I
.
L
.
29
-
889
A
Page
9
TABLE
3
-
DIGITRIP
RMS
910
TRIP
UNIT
MESSAGE
CODES
AND
THEIR
MEANINGS
MESSAGE
MEANING
COMMENT
SEC
.
DISC
Discriminator
Trip
!
(
High
initial
Current
Release
)
EXTernal
Trip
Breaker
tripped
because
phase
current
exceeded
11
x
rating
plug
current
ln
Value
1
1 3
EXTT
Breaker
tripped
due
to
external
communications
control
signal
-
for
example
5.8
from
IMPACC
'
M
GNDT
GrouND
-
fault
Jrip
-
S
Breaker
tripped
because
ground
current
exceeded
Ground
Fault
protection
settings
Phase
current
has
exceeded
85
%
of
Long
-
Time
Current
Setting
for
more
than
40
seconds
3
8
3
9
HILD
High
LoaD
Alarm
ALARM
:
Nearing
Overload
Condition
App
'
x
B
Casef
INST
INStantaneous
TripaT
Breaker
tripped
instantaneously
because
phase
current
exceeded
Instantaneous
protection
setting
Phase
current
has
exceeded
Long
-
Time
current
setting
.
Trip
unit
is
timing
to
trip
breaker
.
3.6
Long
-
Time
Delay
Pick
-
Up
ALARM
:
Overload
Condition
in
Progress
Long
-
Time
Delay
Iripv
4
(
Overload
Trip
)
Negative
POWer
flow
LDPU
3.2
LDT
Breaker
tripped
because
phase
current
exceeded
Long
-
Time
protection
settings
Power
is
flowing
into
“
load
”
side
(
bottom
)
of
breaker
,
and
out
from
“
line
"
side
(
top
)
of
the
breaker
.
Breaker
tripped
instantaneously
because
phase
current
exceeded
short
-
time
rating
of
circuit
breaker
Value
of
current
exceeds
display
capability
3
2
,
3
3
NPOW
1 2
1 3
OverRIDe
Trip
X
.
3
ORID
1.1
4
Qver
RaNGe
Trip
£
3
.
(
Current
too
high
to
measure
.
)
Rating
PLUG
Problem
1.2
.
2
ORNG
Rating
Plug
is
missing
,
damaged
,
or
not
well
connected
.
If
breaker
is
closed
,
it
will
trip
,
and
the
instantaneous
/
override
LED
will
light
.
If
breaker
is
open
,
it
will
not
close
.
Protection
functions
still
operate
,
but
may
be
up
to
12
%
out
-
of
-
tolerance
.
Replace
trip
unit
at
first
opportunity
.
Breaker
tripped
because
phase
current
exceeded
Short
-
Time
Delay
protection
settings
Breaker
tripped
because
ambient
temperature
of
SURE
+
chip
exceeded
95
degrees
C
A
trip
test
will
begin
as
soon
as
you
release
the
push
to
test
button
and
'
‘
TEST
'
message
will
disappear
.
The
breaker
will
trip
,
and
the
cause
of
trip
is
displayed
.
A
No
Trip
Unit
test
will
begin
as
soon
as
you
release
push
to
test
button
,
and
the
display
shows
the
elapsed
time
of
test
.
1.3
PLUG
1
22
1
Nonfatal
memory
error
ROM
ERROR
..
.
3
4
.
3.5
Short
-
Time
Delay
Tip
*
SDT
Ove
rTE
M
Perat
u
re
Trip
1.1
TEMP
4
0
TEST
and
trip
breaker
is
ready
to
begin
TEST
40
Test
(
without
tripping
breaker
)
is
ready
to
begin
[
blank
]
or
1
4
Control
power
is
not
available
,
or
wrong
potential
applied
Trip
Unit
does
not
calculate
THD
values
because
of
a
protection
related
activity
.
Trip
unit
not
“
ON
"
1 2
1 4
Aborted
THD
Calculation
NOTES
:
1
In
the
case
of
a
high
-
level
fault
condition
,
the
Trip
Unit
will
operate
whenever
a
complete
RMS
current
value
exceeds
the
trip
level
.
For
this
reason
,
the
displayed
value
may
be
less
than
the
actual
RMS
fault
current
.
2
In
the
case
of
a
very
high
fault
current
,
the
message
“
ORNG
”
(
indicating
over
range
)
appears
because
the
Trip
Unit
cannot
display
the
actual
value
of
the
fault
current
.
^
OverRIDe
(
Fixed
Instantaneous
)
Trip
is
for
type
LS
and
LSG
Trip
Units
(
no
Instantaneous
element
)
,
on
circuit
breakers
whose
Short
-
Circuit
current
interrupting
capability
exceeds
their
Short
-
Time
Current
withstand
capability
.
(
See
Section
1.1
.
4
)
4
The
values
of
the
currents
displayed
after
a
TRIP
event
,
are
the
values
at
the
time
the
TRIP
operation
was
initiated
.
Although
the
magnitude
of
a
fault
current
,
for
example
,
can
continue
to
increase
after
the
TRIP
operation
is
initiated
,
those
values
of
current
occurring
after
the
TRIP
operation
is
initiated
,
are
not
displayed
.
REVERSE
FED
IN
APPLICATION
.
THEREFORE
DO
NOT
RELY
UPON
THE
VOLTAGE
READOUT
AS
A
SOLE
INDICATOR
OF
THE
BREAKER
’
S
OA
/
/
OFFSTA
-
TUS
OR
BREAKER
’
S
VOLTAGE
STATUS
.
£
^
CAUTION
WHEN
THE
CIRCUIT
BREAKER
’
S
CONTACTS
ARE
OPEN
IT
MAY
OR
MAY
NOT
DISPLAY
THE
BREAKER
’
S
PHASE
TO
PHASE
VOLTAGES
.
THIS
DEPENDS
ON
THE
TYPE
BREAKER
.
THE
TYPE
DS
BREAKERS
PICK
UP
THE
PT
MODULE
’
S
CONNEC
-
TIONS
ON
THE
TOP
SIDE
WHILE
THE
TYPES
SPB
AND
RD
BREAKERS
PT
MODULE
IS
CONNECTED
TO
THE
BOTTOM
SIDE
-
SEE
FIG
2
.
A
SECOND
FAC
-
TOR
TO
CONSIDER
IS
WHETHER
THE
BREAKER
IS
1.2
.
1.3
Instrumentation
-
Power
,
Power
Factor
and
Energy
values
The
Digitrip
RMS
910
Trip
Unit
displays
power
and
energy
values
.
By
using
the
circuit
breaker
current
sen
-
sors
and
an
integrally
mounted
Potential
Transformer
Module
shown
in
Fig
.
6
,
power
and
energy
values
are
F
:
T
’
N
Effective
May
1997
Courtesy of store.ips.us

I
.
L
.
29
-
889
A
Page
10
computed
and
displayed
in
the
four
-
digit
display
window
on
the
face
of
the
Trip
Unit
.
The
power
,
power
factor
and
energy
parameter
values
displayed
in
the
window
on
the
face
of
the
Trip
Unit
include
:
•
Peak
Demand
in
MW
(
Megawatts
)
•
Present
Demand
in
MW
(
Megawatts
)
•
Energy
(
Consumed
)
in
MWh
(
Megawatt
-
hours
)
•
Power
Factor
Four
“
Green
”
LEDs
as
shown
in
Fig
.
1
are
provided
to
indicate
which
value
is
displayed
.
The
same
“
STEP
”
push
-
button
pressed
and
released
to
view
the
different
values
of
current
and
voltage
is
also
pressed
and
released
to
view
the
power
,
power
factor
and
energy
val
-
ues
.
The
Peak
Demand
parameter
is
based
on
a
sampling
window
of
fifteen
(
15
)
minutes
.
Power
is
repeatedly
aver
-
aged
over
this
interval
and
the
maximum
average
is
dis
-
played
as
Peak
Demand
.
The
demand
window
is
not
a
“
sliding
window
”
.
It
is
more
like
a
“
jumping
window
”
.
When
the
Trip
Unit
is
first
energized
,
there
is
a
delay
of
15
minutes
before
the
first
non
-
zero
value
is
displayed
.
To
reset
the
peak
demand
value
shown
in
the
display
win
-
dow
back
to
zero
,
press
and
release
the
(
Black
)
“
Demand
Reset
”
push
-
button
,
shown
adjacent
to
the
“
Peak
Demand
”
label
in
Fig
.
1
.
Note
:
The
peak
demand
function
requires
that
120
VAC
control
power
be
supplied
to
the
Power
/
Relay
Module
.
The
Present
Demand
is
a
power
value
averaged
over
approximately
one
second
.
To
view
the
“
Present
Demand
”
value
in
the
display
window
,
press
and
release
the
“
STEP
”
push
-
button
several
times
until
the
LED
next
to
“
Present
MW
”
is
lighted
.
The
range
,
assumptions
and
accuracy
parameters
for
peak
and
present
power
demand
values
displayed
are
:
RANGE
:
0
to
9.999
MW
ASSUMES
:
5
%
<
Current
<
175
%
of
the
Plug
Rating
ln
SAMPLING
WINDOW
:
15
min
.
for
Peak
Demand
,
-
1
sec
.
for
Present
Demand
ACCURACY
:
range
assumptions
and
accuracy
for
the
system
power
factor
function
values
are
:
from
0.5
(
lagging
)
to
0.5
(
leading
)
balanced
three
-
phase
load
,
per
ANSI
Std
.
C
12.1
-
1988
>
20
%
of
Frame
Rating
for
Series
C
“
R
-
Frame
or
Type
SPB
circuit
breakers
.
>
20
%
of
[
Current
]
Sensor
Rating
for
Type
DS
circuit
breakers
.
±
0.02
The
Energy
parameter
is
the
summation
of
the
average
power
over
time
and
it
is
expressed
in
megawatt
-
hours
(
MWh
)
.
The
value
is
updated
approximately
once
a
sec
-
ond
.
The
value
cannot
be
reset
locally
.
After
the
maxi
-
mum
value
is
reached
,
the
display
automatically
rolls
over
to
zero
.
The
range
and
accuracy
parameters
for
energy
demand
values
displayed
are
:
RANGE
:
RANGE
:
ASSUMES
:
CURRENT
:
CURRENT
:
ACCURACY
:
Oto
999.9
MWh
if
ln
<
1000
A
Oto
9999
MWh
if
ln
>
1000
A
5
%
<
Current
<
175
%
of
the
Plug
Rating
ln
±
5
%
of
(
Frame
Rating
x
600
V
x
time
)
for
Series
C
®
R
-
Frame
or
Type
SPB
circuit
breakers
,
±
5
%
of
(
Current
Sensor
Rating
x
600
V
x
time
)
for
Type
DS
circuit
breakers
.
The
energy
value
is
stored
in
the
Trip
Unit
memory
.
As
long
as
the
120
VAC
control
power
is
maintained
to
the
Power
/
Relay
Module
,
it
can
be
viewed
.
If
the
120
VAC
control
power
is
lost
and
then
is
restored
,
the
Energy
value
is
restored
too
.
The
Digitrip
RMS
910
Trip
Unit
presumes
that
power
is
flowing
into
the
“
top
”
and
out
of
the
bottom
of
the
circuit
breaker
(
positive
flow
of
power
)
.
If
the
power
flows
in
the
opposite
direction
,
i
.
e
.
,
bottom
to
top
,
the
value
of
power
will
not
be
displayed
continuously
.
Instead
,
the
power
value
in
the
display
window
will
alternate
with
the
coded
message
“
NPOW
”
.
This
message
,
alternating
with
the
value
,
indicates
power
flowing
out
of
the
top
of
the
circuit
breaker
.
This
condition
will
occur
when
a
Main
circuit
breaker
is
“
reverse
fed
”
and
can
frequently
occur
for
three
breaker
schemes
that
involve
a
“
tie
”
breaker
.
The
“
NPOW
”
message
can
be
defeated
on
type
DS
and
type
SPB
breakers
only
by
inserting
an
appropriate
"
jumper
”
.
(
See
wiring
diagram
for
your
type
of
circuit
breaker
listed
in
Section
6
.
)
ASSUMES
:
ACCURACY
:
or
±
4
%
of
(
Frame
Rating
x
600
V
)
for
Series
C
®
R
-
Frame
or
Type
SPB
circuit
breakers
,
±
4
%
of
(
Current
Sensor
Rating
x
600
V
)
for
Type
DS
circuit
breakers
.
The
System
Power
Factor
(
PF
)
is
a
unitless
parameter
that
is
displayed
locally
on
the
Digitrip
RMS
910
.
The
or
FiT
-
N
Effective
May
1997
Courtesy of store.ips.us

I
.
L
.
29
-
889
A
Page
11
Press
and
release
the
“
Step
”
push
-
button
until
the
Green
pointer
LED
has
stopped
at
the
[
PF
]
location
.
The
next
press
and
release
of
the
“
Step
”
push
-
button
will
initiate
a
3
-
phase
waveform
capture
internally
in
the
Digitrip
and
in
turn
calculate
all
THD
and
individual
values
.
Notice
that
two
Green
LEDs
[
THD
]
and
[
lA
]
are
now
illuminated
showing
the
THD
percentage
for
phase
A
current
.
If
the
“
Step
”
push
-
button
is
now
pressed
and
held
for
about
2
seconds
,
the
individual
harmonic
currents
that
make
up
the
THD
value
are
displayed
in
percentage
of
the
funda
-
mental
.
The
“
Step
”
push
-
button
may
now
be
released
.
The
display
format
is
that
the
left
two
digits
show
the
har
-
monic
number
(
up
to
the
27
th
harmonic
)
and
the
right
two
digit
positions
show
the
percentage
of
fundamental
for
the
waveform
that
was
captured
.
Each
value
is
displayed
for
about
two
seconds
.
This
sequence
will
continue
in
a
wrap
around
mode
until
the
“
Step
”
push
-
button
is
again
pressed
and
released
in
which
case
the
next
phase
THD
value
is
displayed
.
Again
if
the
“
Step
”
push
-
button
is
pressed
and
held
for
2
seconds
and
its
individual
har
-
monic
content
data
for
lB
will
similarly
be
displayed
.
A
waveform
capture
event
and
harmonic
data
calculation
is
accomplished
by
locally
stepping
to
the
[
THD
]
Green
LED
from
the
[
PF
]
LED
.
The
second
way
is
to
remotely
trigger
the
waveform
capture
via
a
IMPACC
communica
-
tion
command
.
IMPACC
Series
III
software
screens
are
available
to
show
waveform
capture
oscillographs
of
each
phase
as
well
as
bar
graphs
of
the
magnitudes
and
individual
harmonic
that
make
up
the
three
-
phase
cur
-
rents
.
See
Section
5.7
Fig
.
4
Rating
Plug
1.2
.
1.4
Harmonics
[
THD
]
The
Digitrip
RMS
910
provides
capabilities
to
calculate
and
display
the
THD
(
total
Harmonic
Distortion
)
for
phase
currents
[
la
]
,
[
lb
]
and
[
lc
]
.
The
term
THD
is
used
to
define
in
percentage
of
the
power
frequency
current
,
the
amount
of
harmonic
current
that
the
breaker
is
seeing
or
the
sys
-
tem
is
experiencing
.
This
can
be
useful
in
troubleshooting
to
detect
individual
breaker
current
loads
that
could
lead
to
system
problems
and
early
equipment
failure
.
The
equation
used
for
calculating
is
:
l
2
rms
-
if
THD
=
x
100
%
If
where
Irms
is
the
rms
current
of
the
waveform
and
^
is
the
rms
current
of
the
fundamental
frequency
For
example
the
THD
calculation
for
a
load
having
an
equal
rms
value
of
fundamental
and
third
harmonic
cur
-
rent
would
have
a
THD
value
of
100
percent
.
This
would
be
a
large
value
THD
and
would
not
be
typical
.
Besides
individually
displaying
the
THD
for
lA
,
lB
and
lc
,
the
Digitrip
910
will
also
display
the
individual
harmonic
currents
up
to
the
27
th
harmonic
for
lA
,
lB
and
lc
.
The
local
operation
on
the
Digitrip
to
observe
this
data
is
done
using
the
“
Step
”
push
-
button
on
the
front
panel
of
the
Digitrip
.
F
:
T
*
N
Effective
May
1997
Courtesy of store.ips.us

I
.
L
.
29
-
889
A
Page
12
Power
/
Relay
Module
The
range
,
assumptions
and
accuracy
parameters
for
[
THD
]
and
per
harmonic values
displayed
are
:
THD
RANGE
:
ASSUMES
:
Fig
.
5
Fig
.
6
Following
a
circuit
breaker
TRIP
operation
,
the
display
window
indicates the
reason
for
trip
,
using
coded
mes
-
sages
such
as
,
INST
(
Instantaneous
Trip
)
,
LDT
(
Long
Delay
Trip
)
etc
.
As
with
the
ALARM
function
,
press
and
release the
“
STEP
”
push
-
button
to
delete the
reason
for
trip
message
and
the
display
window
will
then show
the
values
of
current at
the time
of
trip
.
(
See
notes
(
1
)
,
(
2
)
and
(
3
)
under
Table
3
.
)
The values remain
in
memory
,
and the
“
red
”
reason
for
Trip
LED
(
See
Figs
.
1
and
3.1
-
3.6
)
remains
lighted
,
until
the
Trip
Unit is
reset
by
press
-
ing
and
releasing
the
“
TRIP
RESET
’
push
-
button
in
the
lower
right
corner
of
the
Trip
Unit
.
(
See
Fig
.
1
.
)
Note
:
After
a
trip
condition
,
RECORD
all
Values
of
interest
and
note
which
“
RED
”
LEDs
are
lighted
.
Cor
-
rect
the
cause
of
the
overload
or
fault
BEFORE
YOU
RESET
the
Trip
Unit
to
avoid
repeated
tripping
.
The
LOCKOUT
after
trip
feature
requires
the
Trip
Unit
to
be
reset
before
the breaker
can
be closed
again
.
For
examples
of
how
to
interpret
the
display
after
an
overload and
after
a
short
-
circuit
,
see
Appendix
B
.
Potential
Transfer
Module
Oto
100
%
50
%
ln
<
Current
<
Long
Delay
Pickup
ACCURACY
:
±
2
%
Using
IEC
947
-
2
Appendix
F
Harmonic
Waveforms
(
Secondary
Injection
)
Per
Harmonic
RANGE
:
2
to
27
harmonic
0
to
99
%
50
%
ln
<
Current
<
Long Delay
Pickup
±
2
%
Using
IEC
947
-
2
Appendix
F
Harmonic
Waveforms
(
Secondary
Injection
)
1.2
.
2
Messages
Displayed
After
ALARM
or
TRIP
During
an
ALARM
condition
or
after
a
circuit
breaker
TRIP
operation
,
one
of
the coded
messages
listed
in
Table
3
will
appear
in
the
display
window
,
provided
con
-
trol
power
is still available
for
the Power
/
Relay
Module
(
See Section
1.4
)
.
If
the
“
STEP
”
push
-
button
is
pressed
the
message
will
be deleted
so
that
menu
values
of
cur
-
rents
(
kA
)
etc
.
can
be viewed
.
Note
:
The
user
should view all
of
the
currents
.
The
first
value
you
see
may
not
be
the
greatest
.
ASSUMES
:
ACCURACY
:
F
:
T
»
N
Effective
May
1997
Courtesy of store.ips.us

11.29
-
889
A
Page
13
Auxiliary
Power
Module
1.2
.
2.1
ROM
Error
...
See
I
.
L
.
If
the
message
,
“
ROM
Error
.
.
.
See
I
.
L
.
”
,
scrolls
across
the
display
window
,
it
means
that
a
non
-
fatal
error
has
been
detected
somewhere
in
the
Trip
Unit
'
s
non
-
volatile
memory
.
The
Trip
Unit
will
still
function
to
protect
the
cir
-
cuit
,
but
the
calibration
may
be
degraded
by
a
few
per
-
cent
.
The
scrolling
message
will
not
remain
in
the
window
constantly
but
is
repeated
periodically
to
remind
you
to
replace
the
Trip
Unit
.
1.3
Frame
Rating
,
Sensor
Rating
(
where
applicable
)
and
Rating
Plugs
The
Frame
Rating
of
a
circuit
breaker
is
the
maximum
RMS
current
it
can
carry
continuously
.
The
maximum
Short
-
Circuit
Current
Ratings
of
the
circuit
breaker
are
usually
related
to
the
Frame
Rating
as
well
.
It
is
often
times
desirable
to
be
able
to
choose
a
current
value
(
ln
)
,
less
than
the
full
frame
rating
,
to
be
the
basis
for
the
circuit
breaker
’
s
protection
functions
,
without
affecting
its
short
-
circuit
current
capability
.
For
the
Digitrip
RMS
910
Trip
Unit
the
maximum
continuous
current
(
ln
)
is
set
by
the
Rating
Plug
(
and
/
or
Current
Sensors
,
where
applicable
)
-
see
Section
6
for
specific
instructions
for
your
circuit
breaker
type
.
The
(
Current
)
Sensor
Rating
(
where
applicable
)
is
the
maximum
RMS
current
the
circuit
breaker
can
carry
with
the
specified
current
sensors
installed
.
The
Sensor
Rat
-
ing
can
be
the
same
or
less
than
the
Frame
Rating
,
but
not
greater
.
The
Rating
Plug
(
see
Fig
.
4
)
fits
into
a
special
cavity
to
complete
the
Trip
Unit
(
see
Fig
.
1
)
.
Fig
.
7
CAUTION
BEFORE
YOU
FIT
THE
RATING
PLUG
INTO
THE
TRIP
UNIT
,
BE
SURE
TO
CHECK
THAT
THE
BREAKER
TYPE
AND
FRAME
RATING
(
OR
SENSOR
RATING
IF
APPLICABLE
)
,
MATCH
THOSE
PRINTED
ON
THE
RATING
PLUG
COVER
.
INSTALLING
A
RATING
PLUG
THAT
DOES
NOT
MATCH
THE
BREAKER
TYPE
AND
FRAME
RATING
(
OR
SENSOR
RATING
,
IF
APPLICA
-
BLE
)
,
CAN
PRODUCE
SERIOUS
MISCOORDINATION
AND
/
OR
FAILURE
OF
THE
PROTECTION
SYSTEM
.
After
installing
the
Rating
Plug
,
press
and
release
the
‘
TRIP
RESET
"
push
-
button
to
turn
off
any
illuminated
LEDs
.
The
purpose
of
the
rating
plug
is
to
set
the
value
of
ln
,
the
basis
for
the
Trip
Unit
protection
function
current
settings
.
(
See
Section
3
for
details
.
)
Each
circuit
breaker
frame
rating
represents
the
maximum
current
it
can
carry
continuously
.
However
for
proper
coordination
of
over
-
current
protection
,
it
is
often
desirable
to
choose
dif
-
ferent
levels
of
ln
for
different
circuit
breakers
of
the
same
frame
rating
.
An
assortment
of
rating
plugs
with
different
ln
values
is
available
for
each
breaker
frame
rating
(
See
circuit
breaker
instruction
leaflet
supplements
listed
in
Section
6
)
to
give
the
user
flexibility
to
change
the
value
of
ln
without
having
to
change
the
primary
current
sen
-
sors
on
the
breaker
.
By
changing
the
rating
plug
,
the
user
can
easily
change
the
range
of
current
protection
settings
without
having
to
remove
the
circuit
breaker
from
its
enclosure
.
For
example
,
if
one
expects
a
circuit
to
carry
600
A
ini
-
tially
,
but
then
increase
to
1400
A
in
the
future
,
one
could
initially
install
1600
A
cables
and
a
1600
A
breaker
frame
with
the
Trip
Unit
rating
plug
whose
ln
=
800
A
.
Then
later
on
when
the
additional
load
is
ready
to
come
on
line
,
the
rating
plug
could
be
exchanged
for
one
with
ln
=
1600
A
,
F
;
T
*
N
Effective
May
1997
Courtesy of store.ips.us

11
.
29
-
889
A
Page
14
without
having
to
remove
the
breaker
from
its
enclosure
.
The
available
settings
would
give
the
following
choices
:
Long
Delay
Setting
lr
=
ln
x
:
.
5
.
6
.
7
.
8
.
85
.
9
.
95
1.0
Plug
ln
=
800
A
LDPU
lr
=
:
400
480
560
640
680
720
760
800
A
Plug
ln
=
1600
A
LDPU
lr
~
.
800
960
1120 1280
1360
1440
1520 1600
A
Note
:
Rating
plugs
from
Digitrip
models
500
/
600
/
700
/
800
CANNOT
be
used
with
model
910
Trip
Units
.
The
connection
pins
are
located
in
different
posi
-
tions
,
so
one
cannot
accidentally
use
the
incorrect
type
of
plug
.
Rating
Plugs
for
the
Digitrip
RMS
910
Trip
Units
are
marked
for
,
and
may
be
applied
on
both
50
and
60
Hz
systems
.
Rating
plugs
have
two
current
ratings
listed
on
their
cov
-
ers
(
See
Fig
.
4
)
.
As
indicated
in
Figs
.
2
and
4
,
a
back
-
up
battery
is
pro
-
vided
to
maintain
the
mode
of
trip
LED
indication
in
the
Digitrip
RMS
910
Trip
Unit
when
external
control
power
to
the
Power
/
Relay
module
is
not
available
.
The
back
-
up
battery
is
located
in
the
rating
plug
along
with
a
battery
check
push
-
button
and
a
green
battery
check
LED
.
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
4.5
.
)
Note
:
The
battery
is
used
only
to
maintain
the
cause
of
TRIP
LED
indication
.
It
has
NO
part
in
the
PRO
-
TECTION
FUNCTION
of
the
Trip
Unit
,
and
,
it
does
NOT
light
the
display
window
.
1.4
Power
/
Relay
Module
The
Power
/
Relay
Module
(
PRM
)(
see
Fig
.
5
)
is
separate
from
the
RMS
Digitrip
910
Trip
Unit
itself
,
and
is
not
required
for
the
Trip
Unit
to
perform
its
protection
func
-
tions
.
The
Power
/
Relay
Module
performs
two
functions
.
First
,
it
uses
available
external
control
power
(
120
V
50
/
60
Hz
ac
,
6
VA
)
to
operate
the
display
window
,
communica
-
tions
circuitry
and
reason
for
trip
LED
indicators
.
Second
,
it
provides
relay
contacts
for
use
by
other
devices
remote
from
the
circuit
breaker
.
•
the
“
Must
Use
With
Frame
Rated
”
current
value
(
or
“
Sensor
Rated
”
,
if
applicable
)
,
and
•
“
ln
(
rated
l
)
=
”
current
value
.
This
latter
value
(
ln
)
is
the
basis
for
the
Trip
Unit
current
settings
:
•
The
instantaneous
and
Ground
Current
Settings
(
if
applicable
)
are
multiples
of
(
ln
)
(
See
Sections
3.6
and
3.8
.
)
•
The
Long
Delay
Current
Setting
,
lr
,
is
a
multiple
of
(
ln
)
.
Long
Delay
Current
Setting
=
lr
=
LD
x
(
ln
)
.
(
See
Section
3.2
.
)
•
The
Short
Delay
Current
Setting
(
if
provided
)
is
a
multiple
of
lr
,
which
in
turn
is
a
multiple
of
(
ln
)
.
Short
Delay
Current
Setting
=
SD
x
lr
=
SD
x
LD
x
(
ln
)
(
See
Section
3.4
.
)
If
the
rating
plug
is
missing
or
not
well
connected
,
then
the
display
will
show
“
PLUG
”
and
the
instantaneous
/
over
-
ride
LED
will
be
lighted
.
If
the
circuit
breaker
is
closed
,
it
will
trip
;
if
it
is
open
,
it
will
remain
trip
-
free
,
as
long
as
120
VAC
control
power
is
available
to
the
Power
/
Relay
Mod
-
ule
.
Even
if
control
power
is
lost
,
and
the
rating
plug
con
-
dition
is
not
corrected
,
as
soon
as
the
three
-
phase
current
through
the
curcuit
breaker
reaches
20
%
(
40
%
if
single
-
phase
current
)
of
the
frame
/
current
sensor
rating
,
the
Trip
Unit
will
trip
the
breaker
again
.
NOTICE
THE
POWER
/
RELAY
MODULE
HAS
120
V
50
/
60
HZ
AC
INPUT
AS
STANDARD
FOR
ALL
BREAKER
TYPES
.
THERE
IS
AVAILABLE
FOR
CERTAIN
BREAKER
TYPES
A
230
V
50
/
60
INPUT
VOLTAGE
RATING
.
BEFORE
ENERGIZING
THIS
CONTROL
VOLTAGE
PLEASE
VERIFY
CORRECT
VOLTAGE
RATING
IS
EMPLOYED
.
THE
DISPLAY
,
COMMUNICATION
OR
TRIP
RELAY
ALARMS
MAY
BE
ERRATIC
OR
NON
-
FUNCTIONAL
IF
WRONG
VOLTAGE
IS
USED
.
lr
lr
Available
Settings
Long
Delay
Setting
lr
0
x
ln
=
lr
.
5
,
.
6
,
.
7
,
.
8
,
.
85
,
.
9
,
.
95
,
1
0
In
Multiples
of
Rating
Plug
Amperes
(
In
)
Fig
.
8.1
Long
Delay
Current
Settings
F
:
T
'
N
Effective
May
1997
Courtesy of store.ips.us

I
.
L
.
29
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Page
15
The
relays
operate
when
the
Trip
Unit
detects
the
follow
-
ing
conditions
:
Available
Settings
2
,
2.5
,
3
,
4
.
5
,
6
,
Si
,
S
2
id
Short
Delay
Setting
U
]
x
/
r
•
Short
-
Circuit
Trip
Alarm
•
High
Load
Alarm
•
Long
Delay
Trip
Alarm
•
Ground
fault
Trip
Alarm
(
types
LIG
,
LSG
,
LSIG
)
or
Neutral
Over
-
Current
Alarm
(
types
LI
,
LS
LSI
)
•
In
addition
,
the
Power
/
Relay
Module
also
contains
the
INCOM
®
COMMUNICATIONS
CLOSE
contact
,
which
operates
the
circuit
breaker
’
s
closing
release
,
on
command
from
INCOM
/
IMPACC
®
.
(
See
Section
5.8
.
)
as
shown
in
Fig
.
2
.
Each
relay
contact
is
rated
for
120
V
,
50
/
60
Hz
ac
,
1.0
Ampere
.
The
High
Load
Alarm
contact
operates
after
the
load
current
has
exceeded
85
%
of
the
long
delay
current
setting
,
lr
for
40
seconds
.
The
40
-
second
delay
allows
the
system
to
“
ride
through
”
momentary
high
load
condi
-
tions
and
avoid
nuisance
alarms
.
The
Long
Delay
Trip
Alarm
contact
operates
after
the
breaker
TRIPS
due
to
over
-
load
conditions
which
exceeded
the
Long
Delay
Trip
settings
.
For
Type
LSG
,
LIG
and
LSIG
Trip
Units
,
the
ground
Fault
Trip
Alarm
contact
operates
after
the
breaker
TRIPS
due
to
conditions
which
exceed
the
Ground
Fault
protection
settings
.
For
Type
LS
,
LI
and
LSI
Trip
Units
,
the
Neutral
Current
Alarm
contact
operates
when
the
neutral
current
exceeds
the
Long
Delay
Current
protection
setting
,
lr
In
Multiples
of
Long
Delay
Setting
*
X
©
Ur
)
Si
and
S
2
Values
are
Specified
on
Rating
Plug
Fig
.
8.3
Short
Delay
Current
Settings
The
Short
-
Circuit
Trip
Alarm
contact
operates
after
the
breaker
TRIPS
due
to
an
INSTantaneous
trip
,
Short
-
Delay
Trip
,
Discriminator
trip
,
a
Fixed
Instantaneous
OverRIDe
trip
,
or
a
Rating
PLUG
trip
as
applicable
.
Even
without
available
external
control
power
,
once
the
load
current
through
the
circuit
breaker
exceeds
approxi
-
mately
20
%
(
40
%
if
single
phase
)
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
,
and
all
protection
functions
are
func
-
tioning
.
However
,
the
display
window
will
remain
dark
.
Note
:
If
120
VAC
control
power
is
lost
to
the
Power
/
Relay
Module
,
the
LOCKOUT
after
trip
will
reset
and
the
breaker
can
be
closed
again
.
However
the
cause
of
trip
bit
will
remain
set
in
the
Digitrip
’
s
non
volatile
memory
and
a
cause
of
trip
message
will
reappear
when
control
power
returns
.
A
complete
clearing
of
cause
of
trip
bistory
may
be
accomplished
by
depressing
the
reset
push
-
button
when
the
Digitrip
unit
is
powered
up
.
(
Indicated
by
the
Unit
Status
flashing
)
1.5
Potential
Transformer
Module
The
Potential
Transformer
Module
(
PTM
)
(
see
Fig
.
6
)
is
also
separate
from
the
RMS
910
Trip
Unit
and
is
not
required
for
the
Trip
Unit
to
perform
its
protection
func
-
tions
.
The
Potential
Transformer
Module
provides
three
-
phase
primary
voltage
information
necessary
for
the
Trip
Unit
to
calculate
power
and
energy
values
.
(
See
Fig
.
2
.
)
The
Potential
Transformer
Module
primary
terminals
are
suitable
for
all
system
voltage
ratings
up
through
600
V
,
50
/
60
Hz
,
and
are
connected
to
the
primary
phase
con
-
ductors
inside
the
breaker
,
providing
stepped
down
volt
-
age
signals
to
input
terminals
VA
,
VB
,
Vc
and
VNon
the
rear
of
the
Digitrip
910
Trip
Unit
housing
.
Long
Delay
Fime
Available
Settings
2
,
4
,
7
.
10
,
12
,
15
,
20
,
24
Seconds
at
6
Times
Long
Delay
Setting
(
M
Fig
.
8.2
Long
Delay
Time
Settings
E
:
T
'
N
Effective
May
1997
Courtesy of store.ips.us

I
.
L
29
-
889
A
Page
16
THE
TRIP
UNIT
.
FOLLOW
THE
INSTRUCTIONS
GIVEN
IN
SECTION
4.1
FOR
REMOVING
THE
VOLT
-
AGE
DISCONNECT
PLUG
TO
ISOLATE
THE
TRIP
UNIT
BEFORE
PERFORMING
DIELECTRIC
TESTS
ON
THE
CIRCUIT
BREAKER
.
SEE
ALSO
THE
SPECIFIC
DIELECTRIC
TEST
PROCEDURES
IN
THE
APPLICA
-
BLE
CIRCUIT
BREAKER
INSTRUCTION
LEAFLET
,
LISTED
IN
SECTION
6
.
Short
Delay
Time
[
~
4
~
|
Sec
0
1.6
Auxiliary
Power
Module
The
Auxiliary
Power
Module
or
APM
(
Cat
.
No
.
PRTAAPM
)
,
illustrated
in
Fig
.
7
,
is
an
encapsulated
power
supply
that
requires
a
120
VAC
input
at
either
50
or
60
Hz
.
It
provides
an
output
of
32
Vdc
(
nominal
40
Vdc
open
circuit
)
which
is
used
during
testing
of
the
Digitrip
RMS
910
Trip
Unit
,
whenever
120
VAC
control
power
is
not
available
to
the
Power
/
Relay
Module
.
(
See
Section
1.4
.
)
When
a
drawout
circuit
breaker
is
equipped
with
a
Digitrip
RMS
910
Trip
Unit
,
it
can
be
conveniently
set
and
tested
while
the
circuit
breaker
is
either
out
of
its
cell
or
in
its
cell
in
the
“
Test
”
,
“
Disconnect
”
or
“
Withdrawn
”
posi
-
tions
by
using
the
Auxiliary
Power
Module
.
.
The
Auxiliary
Power
Module
is
equipped
with
a
unique
plug
-
in
connector
suitable
only
for
plugging
in
to
the
keyed
receptacle
in
the
upper
right
corner
of
a
Digitrip
RMS
Trip
Unit
as
shown
in
Fig
.
1
.
This
avoids
the
inad
-
vertent
use
of
an
incorrect
type
power
module
.
The
APM
is
suitable
for
use
with
older
Digitrip
RMS
500
,
600
,
700
,
800
,
as
well
as
newer
RMS
510
,
610
,
810
and
910
Models
.
Available
Settings
1
,
.
2
,
.
3
,
.
4
,
.
5
,
Seconds
with
Flat
Response
r
~
i
.
.
'
I
2
t
Shape
Returns
to
Flat
Response
at
Currents
Higher
than
8
x
lr
.
1
*
.
.
3
»
,
.
5
*
Seconds
with
l
2
t
Shape
In
Viewing
Window
Indicates
l
2
t
Shape
Fig
.
8.4
Short
Delay
Time
Settings
Available
Settings
*
2
,
2.5
,
3
,
4
,
5
,
6
,
Ml
,
M
2
*
Setting
Inst
.
I
•
(
Tjxln
;
In
Multiples
of
Rating
Plug
Amperes
On
)
2.0
UL
Listed
Devices
Digitrip
RMS
910
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
.
0
0
M
1
and
M
2
Values
are
Specified
on
Rating
Plug
Fig
.
8.5
Instantaneous
Current
Settings
The
primary
voltage
connection
to
the
Potential
Trans
-
former
Module
is
made
through
a
disconnecting
plug
(
see
Figs
.
2
)
that
can
be
located
either
on
the
module
(
as
shown
in
Fig
.
6
)
or
on
the
side
of
the
circuit
breaker
,
as
indicated
in
the
applicable
circuit
breaker
instruction
leaf
-
let
.
(
See
Section
6
.
)
Available
Settings
ifTTru
Gnd
-
Fault
Setting
filx
ln
A
,
B
,
C
,
D
,
E
,
F
,
H
.
K
©
Specific
Values
Given
on
Circuit
Breaker
Time
-
Current
Curve
and
in
Table
1
CAUTION
APPLYING
VOLTAGES
GREATER
THEN
600
VAC
TO
THE
PRIMARY
CONDUCTORS
OF
THE
CIRCUIT
BREAKER
,
SUCH
AS
FOR
DIELECTRIC
WITHSTAND
TESTING
,
CAN
POSSIBLY
DAMAGE
THE
PTM
OR
Fig
.
8.6
Ground
Fault
Current
Settings
"
N
Effective
May
1997
Courtesy of store.ips.us

I
.
L
.
29
-
889
A
Page
17
TABLE
4
-
GROUND
FAULT
CURRENT
SETTINGS
%
GROUND
FAULT
CURRENT
SETTINGS
(
AM
PERES
)
,
?
*
4
Grid
Fault
Time
|
~
3
]
Sec
.
A
B
C
D
E
F
H
K
100
25
30
35
40
50
60
100
75
200
50
60
70
80
100 120
150
200
O
0
250
63
75
88
100
125
150
188
250
•
CN
-
£
300
£
600
75
90
105
120
150
180
225
300
100 120
140
160
200 240
300
400
150 180
210
240
300
360
450
600
CL
^
630
^
800
189
221
158
252
315
378
473
630
Available
Settings
200 240
280
320
400 480
600
800
O
.
1
,
.
2
,
.
3
,
.
4
.
.
5
J
i
D
1000
CL
1200
°
1250
250
300
350
400
500
600
750
1000
300
360
420
480
600
720
900
1200
Seconds
with
Flat
Response
i
312
375
438
500
625
750
1200
938
2
1600
01
2000
400
480
560
640
800
960
1200
1200
]
500
600
700
800
1000
1200
1200
1200
ILI
2400
600
720
840
960
1200
1200
1200
1200
^
2500
625
750
875
1000
1200 1200
1200
1200
C
/
D
3000
/
3150
750
900
1050
1200
1200
1200
1200
1200
l
2
t
Shape
Returns
to
Flat
Responses
at
Approximately
0.625
ln
2
:
3200
960
800
1120
1200
1200
1200
1200
1200
4000
1000
1200
1200
1200
1200 1200
1200
1200
5000
1200
1200 1200
1200
1200 1200
1200
1200
i
T
"
i
*
i
:
Tolerances
on
settings
are
±
10
%
of
values
shown
.
Refer
to
Type
DS
.
Type
SPB
or
Series
C
R
-
Frame
supplemental
instruction
leaflets
given
in
Section
6
for
list
of
available
rating
plugs
for
each
type
circuit
breaker
.
t
.
1
\
.
3
*
,
.
5
*
i
I
%
Seconds
With
’
r
l
2
t
Shape
I
In
Viewing
Window
Indicates
l
2
t
Shape
3.0
PROTECTION
SETTINGS
Fig
.
8.7
Ground
Fault
Time
Delay
Setting
The
available
settings
,
along
with
the
illustrated
effect
of
changing
the
settings
are
given
in
Figs
.
8.1
through
8.7
.
3.2
Long
Delay
Current
Setting
There
are
eight
(
8
)
available
Long
Delay
“
Pick
-
up
"
Cur
-
rent
Settings
,
as
illustrated
in
Fig
.
8.1
.
Each
setting
,
called
is
expressed
as
a
multiple
(
ranging
from
.
5
to
1
)
of
the
rating
plug
current
(
ln
)
.
Note
:
“
/
r
”
is
also
the
basis
for
the
Short
-
Delay
Cur
-
rent
Setting
.
(
See
Section
3.4
.
)
3.1
General
Prior
to
placing
any
circuit
breaker
in
operation
,
each
Trip
Unit
protection
setting
must
be
set
to
the
values
specified
by
the
person
responsible
for
the
installation
.
The
number
of
settings
that
must
be
made
is
determined
by
the
pro
-
tection
supplied
as
illustrated
in
Figs
.
8.1
through
8.7
.
Each
setting
is
made
with
a
rotary
switch
,
using
a
small
screwdriver
.
The
selected
setting
for
each
adjustment
appears
in
its
respective
rectangular
viewing
window
as
illustrated
in
Fig
.
1
.
The
installed
rating
plug
establishes
the
maximum
con
-
tinuous
current
rating
(
ln
)
,
up
to
,
but
not
exceeding
the
Frame
Rating
of
the
circuit
breaker
.
Instantaneous
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
used
to
make
each
set
-
ting
is
located
nearest
that
portion
of
the
simulated
Time
-
Current
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
”
,
indi
-
cating
the
reason
for
the
'
TRIP
”
.
3.3
Long
Delay
Time
Setting
There
are
eight
(
8
)
available
Long
Delay
Time
Settings
as
illustrated
in
Fig
.
8.2
,
ranging
from
2
to
24
seconds
.
These
settings
are
the
total
clearing
times
in
seconds
,
when
the
current
value
equals
six
(
6
)
times
lr
.
The
(
LS
)
Time
-
Current
Curve
applicable
for
your
circuit
breaker
gives
complete
details
.
(
See
Section
6
.
)
Note
:
In
addition
to
the
standard
Long
Delay
Protec
-
tion
Element
,
the
Digitrip
RMS
910
Trip
Unit
also
has
a
Long
Time
Memory
(
LTM
)
function
,
which
serves
to
protect
load
circuits
from
the
effects
of
repeated
overload
conditions
.
If
a
breaker
is
re
-
closed
soon
t
F
:
T
'
N
Effective
May
1997
Courtesy of store.ips.us

I
.
L
.
29
-
889
A
Page
18
after
a
Long
Delay
Trip
,
and
the
current
again
exceeds
the
Long
Delay
Current
Setting
,
lr
,
the
LTM
automatically
reduces
the
time
to
trip
,
to
allow
for
the
fact
that
the
load
circuit
temperature
is
already
higher
than
normal
,
due
to
the
prior
overload
condi
-
tion
.
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
“
Setting
”
value
.
To
reset
the
LTM
quickly
,
see
Section
4.4
,
item
3
.
label
(
see
Fig
.
4
)
,
and
on
the
applicable
(
I
)
Time
-
Current
Curve
referenced
in
Section
6
.
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
ln
=
Phase
Current
Test
-
NO
breaker
TRIP
;
"
GFT
"
=
Ground
Current
Test
and
TRIPS
breaker
;
"
GF
"
=
Ground
Current
Test
-
NO
breaker
TRIP
.
See
Section
4.4
.
2
for
inser
-
vice
test
trip
limitations
.
Test
Amps
3
-
’
!
x
In
0
0
Test
3
)
O
Trip
n
Reset
®
w
3.4
Short
Delay
Current
Setting
There
are
eight
(
8
)
available
Short
Delay
“
Pick
-
up
”
Cur
-
rent
Settings
,
as
illustrated
in
Fig
.
8.3
.
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
specified
both
on
the
rating
plug
label
(
see
Fig
.
4
)
and
on
the
applicable
(
LS
)
Time
-
Current
Curve
referenced
in
Section
6
.
&
Push
,
then
release
button
to
reset
Trip
Unit
.
Required
following
all
automatic
trip
and
test
operations
.
'
%
Push
,
then
release
button
to
test
.
Test
operation
begins
with
release
of
pushbutton
.
Unit
O
Status
Fig
.
9
Integral
Test
Panel
(
Lower
Right
Corner
of
Trip
Unit
)
3.7
NO
Instantaneous
Current
Setting
For
types
LS
and
LSG
Trip
Units
,
please
see
Sections
1.1
.
3
Discriminator
(
High
initial
Current
Release
)
and
1.1
.
4
OVERRIDE
(
Fixed
Instantaneous
)
,
for
available
fast
-
acting
high
short
-
circuit
protection
.
3.8
Ground
Fault
Current
Setting
The
eight
(
8
)
Ground
Fault
“
Pick
-
up
”
Current
Settings
are
labeled
with
the
code
letters
“
A
”
through
“
K
”
(
except
there
are
no
“
G
”
or
“
I
”
settings
)
,
as
illustrated
in
Fig
.
8.6
.
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
4
and
on
the
(
G
)
Time
-
Current
Curve
applicable
for
the
circuit
breaker
(
see
Section
6
)
.
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
Section
1.6
and
Fig
.
7
)
.
3.9
Ground
Fault
Time
Delay
Setting
As
illustrated
in
Fig
.
8.7
,
there
are
two
different
Ground
Fault
curve
shapes
,
i
.
e
.
,
fixed
time
(
flat
)
and
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
.
3.5
Short
Delay
Time
Setting
As
illustrated
in
Fig
.
8.4
,
there
are
two
different
Short
Delay
curve
shapes
,
i
.
e
.
,
fixed
time
(
flat
)
and
l
2
t
response
.
The
shape
selected
depends
on
the
type
of
selective
coordination
chosen
.
The
l
2
t
response
will
pro
-
vide
a
longer
time
delay
in
the
low
-
end
of
the
short
delay
current
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
eight
(
8
)
times
lr
,
the
Long
Delay
Setting
.
For
currents
greater
than
8
times
lr
,
the
l
2
t
response
reverts
to
the
flat
response
.
Note
:
See
also
Section
1.1
.
5
,
Zone
Interlocking
,
above
.
3.6
Instantaneous
Current
Setting
There
are
eight
(
8
)
available
Instantaneous
Current
Set
-
tings
,
as
illustrated
in
Fig
.
8.5
.
Six
settings
are
in
the
range
from
2
to
6
times
the
rating
plug
value
(
ln
)
,
and
the
other
two
settings
are
“
M
1
”
and
“
M
2
”
times
(
ln
)
.
The
val
-
ues
that
“
M
1
”
and
“
M
2
”
have
depend
upon
the
type
of
cir
-
cuit
breaker
,
and
are
specified
both
on
the
rating
plug
E
;
T
’
N
Effective
May
1997
Courtesy of store.ips.us

I
.
L
.
29
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889
A
Page
19
VERIFY
THAT
NO
VOLTAGE
IS
PRESENT
ON
THE
CIRCUIT
BREAKER
BEFORE
REMOVING
THE
VOLT
-
AGE
DISCONNECT
PLUG
.
(
SEE
FIG
.
6
.
)
REMOVE
THE
VOLTAGE
DISCONNECT
PLUG
TO
ISO
-
LATE
THE
POTENTIAL
TRANSFORMER
MODULE
(
FIG
.
6
)
BEFORE
PERFORMING
ANY
VOLTAGE
TESTS
ON
THE
CIRCUIT
BREAKER
.
REINSTALL
THE
PLUG
ONLY
AFTER
ALL
VOLTAGE
TESTS
HAVE
BEEN
COMPLETED
AND
CONFIRM
THAT
NO
VOLT
-
AGE
IS
PRESENT
ON
THE
CIRCUIT
BREAKER
.
REINSTALL
THE
VOLTAGE
DISCONNECT
PLUG
TO
RECONNECT
THE
POTENTIAL
TRANSFORMER
MODULE
BEFORE
PLACING
THE
BREAKER
BACK
INTO
SERVICE
.
REFER
TO
THE
APPLICABLE
CIR
-
CUIT
BREAKER
INSTRUCTION
LEAFLET
SUPPLE
-
MENT
(
LISTED
IN
SECTION
6
)
FOR
COMPLETE
INSTRUCTIONS
.
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
x
ln
(
The
ln
value
is
marked
on
the
installed
rating
plug
)
.
For
currents
greater
than
0.625
x
ln
,
the
l
2
t
response
reverts
to
the
flat
response
.
Note
:
See
also
Section
1.1
.
5
on
Zone
Interlocking
.
Note
:
In
addition
to
the
standard
Ground
Fault
pro
-
tection
,
the
Digitrip
RMS
910
Trip
Unit
also
has
a
GROUND
TIME
MEMORY
(
GTM
)
function
,
which
serves
to
protect
loads
in
the
event
of
a
sputtering
arc
to
ground
.
Without
the
GTM
function
,
the
Trip
Unit
would
normally
reset
each
time
the
arc
sput
-
tered
,
and
begin
to
time
-
out
all
over
again
,
so
that
a
sputtering
fault
may
not
have
been
detected
.
But
with
the
GTM
function
,
the
Trip
Unit
“
remembers
”
the
sputtering
ground
current
for
up
to
five
(
5
)
times
the
Ground
Fault
Time
Setting
.
After
that
time
,
it
does
reset
automatically
.
The
GTM
function
does
reset
rather
quickly
;
on
the
0.1
second
setting
,
for
exam
-
ple
,
it
will
reset
in
0.5
second
.
CAUTION
TESTING
A
CIRCUIT
BREAKER
UNDER
“
TRIP
CON
-
DITIONS
”
WHILE
IT
IS
IN
SERVICE
AND
CARRYING
LOAD
CURRENT
,
WHETHER
DONE
BY
LOCALLY
OR
BY
REMOTE
MEANS
,
IS
NOT
RECOMMENDED
.
ANY
TRIPPING
OPERATION
WILL
CAUSE
DISRUP
-
TION
OF
SERVICE
AND
POSSIBLE
PERSONAL
INJURY
RESULTING
FROM
UNNECESSARY
SWITCH
-
ING
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
.
4.0
TEST
PROCEDURES
4.1
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
EQUIP
-
MENT
.
DE
-
ENERGIZE
THE
CIRCUIT
AND
DISCONNECT
THE
CIRCUIT
BREAKER
BEFORE
PERFORMING
MAINTE
-
NANCE
OR
TESTS
.
DO
NOT
ATTEMPT
TO
PERFORM
DIELECTRIC
(
OR
HIGH
POT
OR
HIGH
VOLTAGE
)
WITHSTAND
TESTS
ON
THE
CIRCUIT
BREAKER
WHILE
THE
VOLTAGE
DISCONNECT
PLUG
TO
THE
POTENTIAL
TRANS
-
FORMER
MODULE
IS
INSTALLED
.
(
SEE
FIG
.
6
AND
INSTRUCTIONS
FOR
TESTING
YOUR
SPECIFIC
CIR
-
CUIT
BREAKER
LISTED
IN
SECTION
6
.
)
PTM
OR
TRIP
UNIT
DAMAGE
OR
FAILURE
CAN
RESULT
FROM
ENERGIZING
PTM
AT
MORE
THAN
600
VOLTS
.
4.2
When
To
Test
Tests
can
be
conducted
with
the
breaker
in
the
“
con
-
nected
”
cell
position
while
carrying
load
current
.
How
-
ever
,
as
stated
in
the
caution
note
in
Section
4.1
,
good
practice
will
limit
circuit
breaker
in
-
service
“
trip
tests
”
,
where
required
,
to
maintenance
periods
during
times
of
minimum
load
conditions
.
Testing
is
accomplished
with
the
breaker
out
of
its
cell
or
in
the
‘
Test
”
,
“
Disconnected
”
or
“
Withdrawn
”
(
or
Removed
)
cell
positions
.
Note
:
Since
time
-
current
settings
are
based
on
desired
system
coordination
and
protection
schemes
,
the
protection
settings
selected
and
preset
in
accordance
with
Section
3
above
should
not
be
altered
during
or
as
a
part
of
any
routine
test
sequence
.
F
:
T
'
N
Effective
May
1997
Courtesy of store.ips.us

I
.
L
29
-
889
A
Page
20
4.4
Conducting
Tests
To
preserve
the
primary
protection
function
of
the
Trip
Unit
,
all
in
-
service
testing
whether
under
‘
Trip
”
or
“
No
-
Trip
”
conditions
is
executed
ONLY
if
load
current
val
-
ues
are
no
greater
than
50
%
x
lr
(
lr
=
the
Long
Delay
Cur
-
rent
Setting
)
.
Any
attempt
to
conduct
in
-
service
testing
when
the
load
current
exceeds
50
%
of
/
r
,
will
NOT
be
executed
by
the
Trip
Unit
.
Since
the
Digitrip
RMS
910
Trip
Unit
is
designed
to
run
with
control
power
from
the
Power
/
Relay
Module
for
the
display
window
and
communications
functions
,
all
testing
should
be
conducted
with
the
control
power
available
,
either
through
the
Power
Relay
Module
or
,
when
the
breaker
is
outside
the
enclosure
,
through
the
Auxiliary
Power
Module
(
APM
)
(
See
Section
1.6
and
Fig
.
7
)
.
Although
the
Trip
Unit
is
designed
to
perform
all
of
its
Protection
Functions
without
the
external
control
power
,
and
without
the
display
and
communication
functions
available
,
results
of
the
tests
could
be
confusing
.
When
performing
a
single
-
phase
primary
current
injection
tests
,
for
example
,
especially
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
per
-
formed
correctly
.
Use
the
APM
for
correct
Trip
Unit
perfor
-
mance
whenever
single
-
phase
current
injection
tests
are
made
.
4.3
Testing
Provisions
As
illustrated
in
Figs
.
1
and
9
,
an
integral
test
panel
is
provided
to
test
the
Digitrip
RMS
910
Trip
Unit
.
While
the
Integral
Test
Panel
does
enable
one
to
check
the
performance
of
many
parts
of
the
trip
system
,
includ
-
ing
:
•
Microprocessor
Functions
•
Trip
Release
•
Trip
Settings
•
LEDs
•
Display
Panel
•
Zone
Interlocking
Function
•
Power
Relay
Module
•
Rating
Plug
•
Communications
Functions
there
are
some
parts
it
cannot
check
,
for
example
:
•
Current
Sensors
•
Auxiliary
Current
Transformers
•
Bridge
Circuits
•
Calibration
Resistors
•
Potential
Transformer
Module
•
Analog
Override
Circuit
and
the
functions
of
these
elements
are
best
verified
by
primary
current
injection
testing
.
As
indicated
in
Fig
.
9
,
note
1
,
six
different
“
Test
Amps
”
settings
(
1
,
2
,
3
,
6
T
,
8
and
10
x
ln
)
are
available
for
testing
the
phase
elements
of
the
Trip
Unit
,
and
two
settings
(
GF
and
GFT
)
are
provided
for
testing
the
ground
element
.
Before
starting
any
test
sequence
,
check
the
Unit
Status
(
Green
LED
)
in
the
lower
right
corner
of
the
Trip
Unit
(
See
Figs
.
1
and
9
)
to
be
sure
it
is
blinking
on
and
off
about
once
each
second
,
which
indicates
that
the
Trip
Unit
is
functioning
normally
.
In
the
event
the
Unit
Status
LED
is
not
blinking
,
install
an
Auxiliary
Power
Module
(
APM
)
(
See
Fig
.
7
)
,
or
if
you
have
already
installed
one
,
check
to
see
that
it
is
connected
correctly
.
(
See
Section
1.6
.
)
If
the
circuit
breaker
is
carrying
current
,
check
that
the
current
is
not
more
than
50
%
of
the
Long
Delay
Current
Setting
(
/
r
)
;
because
the
Trip
Unit
will
not
execute
your
test
instructions
when
it
senses
that
the
current
through
the
breaker
exceeds
the
50
%
level
.
If
the
current
through
the
circuit
breaker
increases
to
a
value
greater
than
50
%
of
the
Long
Delay
Current
Setting
,
/
r
,
the
Trip
Unit
will
automatically
abort
any
Trip
Unit
Test
that
may
be
in
progress
.
Should
an
1
)
^
CAUTION
A
SETTING
OF
EITHER
6
TOR
GFT
WILL
TRIP
THE
CIRCUIT
BREAKER
.
(
SEE
SECTIONS
4.1
AND
4.4
.
2
.
)
FOR
ANY
COMBINATION
OF
THE
PHASE
PROTEC
-
TION
SETTINGS
,
AN
APPROPRIATE
“
NO
TRIP
”
CON
-
DITION
CAN
BE
SET
TO
TEST
THE
LONG
TIME
,
SHORT
TIME
AND
INSTANTANEOUS
TRIP
SET
-
TINGS
WITHOUT
TRIPPING
THE
CIRCUIT
BREAKER
.
(
SEE
SECTION
4.4
.
1
.
)
IN
THE
“
GF
”
TEST
POSITION
,
THE
LEVEL
OF
TEST
CURRENT
,
BASED
ON
ln
,
IS
ADEQUATE
TO
DEMON
-
STRATE
THE
OPERATING
CONDITION
OF
THE
TRIP
UNIT
WITHOUT
TRIPPING
THE
CIRCUIT
BREAKER
.
THIS
IS
A
FUNCTIONAL
CHECK
ONLY
,
NOT
A
CALI
-
BRATION
.
2
)
EiTN
Effective
May
1997
Courtesy of store.ips.us