Eaton Cutler-Hammer Digitrip RMS 510 - Rms 810 & 910; Selection and Content

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27
AD
33-855-4
sEcTloN
7
DIGITRIP
RMS
810
&
910
RETROFIT
KITS
7.1
Digitrip
RMS
810
&
910
Retrofit
Kit
Selection
and
Content
The Dioitrio
RMS
810
&
910
Retrofit
Kit
series
are
tne top-of
ihe
line
of Betrofit
Kits'
The
Retrofit
Kits
are
available
with
the
applicable
Digitrip
RMS
Trip
Unit
Overcurrent
Trip
Functions,
(i.e.:
Long
Time
.
{L). Short
Time
(S),
instantaneous
(l).
and
Ground
Fault
Time
(G)
tjelays).
The
combinations
available
are
Ll,
LS,
LSl,
LlG,
LSG,
LSIG.
Dioitrio
RMS
810
&
910
Retrofit
Kits
feature
Communications
Capability
when
applied
with
the Cutler-Hammer
PowerNet
System'
The
RMS
810
&
910
Kits
have
essentially
the same
content,
except
for
the
Trip
Unit.
The
Communication,
Zone
lnterlocks,
and
Remote
Alarm
Signals
are
ex-
tracted
from
the
Trip Unit
by an
External
Harness'
The
External
Harness
includes
a
20-pin
plug,
which
connects
to
the
Cell
Harness
Assembly'
A
120
VAC
control
power source
is required
to
oower uD
the
Power
Relay
Module
(ATR)
remote
sionals.
ihe
local
mode
of
trip
indicators,
PowerNet
C6mmunications,
and
the
Trip
Unit
Alphanumeric
Digital
Display.
A
Potential
Transformer
(PT)
Mod-
ulJ orovides
fhe
distribution
system
voltage
input
to
the
Trip
Unit.
The
PT
Module
is
provided with.a
disconnect
plug which
is
to be
disconnected
in the
event
of
Breaker
dielectric
testing'
Figures
7-1
,
12-10,
and
12-14
provide the
Retrofit
Kit
wiring
connections
on
the
Breaker
and
in
the Switchgear
Cell.
All Retrofit
Kit
components
are
mounted
on
the
Breaket
except
the Cell
Harness
Assembly'
The
120
VAC
control
power
can
be supplied
externally,
via
wiring
in
the
cell,
or
it can
be
sup-
olied via
a Breaker
Mounted
Control
Power
Trans-
iormer
(CPT)
which
is
optional
with
the
Retrofit
Kit'
7.2
Digitrip
RMS
810
&
910
Retrofit
Kit
Features
Digitrip
RMS
810
& 91
O Trip
Units
have
the
follow-
inJ features
available
for
customer
use,
when
up."pti"a
in
Digitrip
RMS
Retrofit
Kits:
1.
Basic
(L,
S,
l, G)
Overcurrent
Protection,
as
selected;
2.
Defeatable
Discriminator
Capability,
if
instantaneous
function
is
not
provided;
3.
LTM
Memory
Function;
4.
Irue
RMS
Sensing;
5.
lntegral
TriP Unit
Testing;
6.
Unit
Status
lndicator;
7 . Local
Mode
of
TriP lndicators;
8.
Selectable
l2t
on Short
Time
and
Ground
Fault
Time
Delays
when
those
options
are
selected;
9.
Local
Four
Digit
Alphanumeric
Display;
1 0."
Zone
lnterlock
capabilities
of
the Breaker
Short
Time
and
Ground
Fault
Delay
Functions'
when
those
options
are
selected;
1
1 .. Remote
Relay
Contacts
for
high
load
and
mode
of
triP
indication;
12. For Powered
610,
810'
&
910
Trip
Units:
Once
an
overcurrent
has
occurred,
the
Trip Unit
sends
an
electrical
signal
to
the
Direct
Trip
Actuator
(DTA) which
will be
monitored
until
the
Trip
Unit
is reset,
keeping
the
Breaker
in
a
trip
free
condition;
.The
Zone
lnterlock
and
ATF
Relay
Contacts
are
available
on
g10
fsf
o
Kits
with
the
normal
Cell
Harness
A
popular option
i" to
"o""itu
tn"
gt"aker
Mounted
CPT
with
a simplified
Cell
iu.""".
tn tni"
ca"e,
the Zone
lnterlock
and
ATR contacts
are
"rittlJ"no
only
the
INCOIVN/
connections
are
required
in
the
Cell
(Figure
7-1).
fni" ooiion
-inirnizes
the Cell
work
required
to
iust
running
#e-P-JwerNet
twisted
pair
from
Cell
to
Cell isee
Section
10)'
Efiective
9/01
ElT.il