Eaton Cutler-Hammer Digitrip RMS 510 - Page 13

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Page 12
AD
33-855-4
The
Trip Unit
includes a female
type receptacle
provided
to accept a
Rating Plug,
which, in con-
ced
with the Current
Sensors,
determines
the
Continuous
Current
Rating
(ln)
of
the Breaker or
the Long
Delay
(lr)
Setting of
the Breaker.
Adjust-
able current
protective
settings
are
provided
for
the Long
Time
(L),
Shod Time
(S),
lnstantaneous
(l),
and Ground
Fault
(G)
Trip Functions
selected.
Short
Time
(S)
and Ground
Fault
(G)
Delays
are
equipped
with an adjustable
setting
for a flat or
an
l2t response.
The adjustable
settings are
step-type,
expressed
in terms of Continuous
Current
Rating
(ln)
the maximum
of the Breaker
or the
Long Delay
Setting
(lr)
of the
Breaker. LEDs
provide
Mode
of
Trip lndications
for the L, S,
l, and G
trip functions.
Digitrip
RMS Trip
Units are equipped
with
multi-pin
disconnect
plug
receptacles
which
permit
quick
connections
to the
Auxiliary CT Harness
and,
when
supplied,
the
External Harness.
The Power
Relay
Module
(ATR)
is
provided
in
Digitrip
RMS
Trip Unit Kits 61
0 through
91 0 only.
The ATR
provides
hard
contact
closures
for
remote
indication
of the
following
Trip Unit functions:
.
High Load
(HL)
Alarm
The HL contact closes
when the current
passing
through the
Breaker exceeds
85%
of
the Trip Unit
Long Delay
Pickup Setting
continuously
for
more than
40
seconds.
.
Long Delay
(LD)
Trip
.
Short
Circuit
(SC)
Trip
.
cround
Fault
(GF)
Trip
o
PowerNet
Remote Close
(CC1
and
CC2)
Contact
(RMS
810 & 910
Trip Units only)
All ATR contacts
are
rated 1 ampere
at 120
VAC or
1
ampere
at 28
VDC. These
contacts are
generally
used for
illuminating
indicator.lights
or
picking
up
slave
relays local
to or remote
from
the Breaker /
Switchgear.
A bridge
rectifier circuit
in the ATR
serves
to
power
up the
Trip
Unit,
the
Trip
Unit
Alphanumeric
Display,
and the
INCOM Communi-
cations,
when
a 120 VAC
source
is
supplied
to
ATR
terminals
AC120 and
ACCOM.
Digitrip
RMS
Trip Units are equipped
with a recep-
tacle, located
on
the front of the
Trip Unit,
to
receive
the Auxiliary
Power
Module
(APM).
The
APM is used
to supply
power
to the Trip Unit
self-
test
system
during
Circuit
Breaker
testing. Adjust-
able test settings
are
provided
which enable
the
unit
to be tested
with or
without tripping
the
Breaker.
Figures 3-2
though 3-4a & 3-4b
provide
the
pub-
lished Digitrip
RMS Characteristics
Curves
for
Retrofit Breakers.
Also
provided
are
the
available
Trip Unit settings
for all trip functions.
These
curves
are available
on onion
paper
as Applica-
tions Data
32-870.
F:T.il
Efiective 9/01