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AD 33-855-4
3.9 External Harness
The External Harness
is used to
extract
Zone
lnterlocking, Remote Alarm,
and PowerNet com-
munications
signals, as applicable, from the Trip
Unit and to connect the 120
VAC
power
required
on
RMS
610, 810, & 910 Kits. The External Har-
ness also has a large 20-pin
plug
that
plugs
into
the
Cell
Harness
Assembly which is mounted in
the Switchgear Cell. The External
Harness
pro-
vided with
RMS 510 Basic Kits
consists of
just
a
small
jumper
plug
that
shorts out the Zone lnter-
lock
connections on the Trip Unit.
3.10 Potential Transformer
(PT)
Module
A
Potential
Transformer
(PT)
Module is
supplied
with
each
RMS
81 0 & 910 Kit. The PT Module
passes
on Circuit Breaker
primary
voltage informa-
tion to the Trip
Unit
for
use
in
obtaining PowerNet
energy monitoring data. Three
(3)
600
Volt
jeads
are
provided
for
the PT Module
primary
connection
to the Breaker. These leads may
be connected to
either the Line
Side or Load Side of the Breaker.
The PT Module secondary terminates
to a 4-pin
female
plug
to
permit
connection to the Trip
Unit.
I
caulom
THE PT MODULE PRIMARY
DISCONNECT
PLUG MUST BE DISCONNECTED
WHEN
DIELECTRIC TESTING OF THE BREAKER
/
SWITCHGEAR ASSEMBLY
IS PERFORMED
OR
THE TRIP
UNIT AND / OR THE PT MODULE
MAY BE DAMAGED. DO NOT
DISCONNECT
THE PT
MODULE PLUG WHEN THE BREAKER
IS ENERGIZED OR IN THE
CONNECTED
POSITION. MOVE
THE BREAKER TO THE
TEST POSITION BEFORE PULLING
THE PT
MODULE PLUG.
3,1 1
Cell
Harness
Assembly
The
Cell Harness Assembly is
provided
on
all
Retrofit Kits,
except the RMS 510 Basic
series and
the 610 simplified kits with
the Breaker Mounted
Control Power Transformer
(CPT).
lts function
is to
extract the Zone lnterlocking,
Remote Alarm,
and
Communications
Signals from the Breaker
by
connection to the External Wiring
Harness, and
provide
terminations
for external customer
con-
nections. Use of the
Cell Harness Assembly re-
duces the time required
for Retrofit. lt
eliminates
the
need to completely rewire
the secondary
contacts
on
the
Circuit Breaker
and
in
the
Switchgear to accommodate the
added Digitrip
RMS
signals.
The Cell Harness Assembly
mounts in the
Breaker
compartment of the Switchgear. The
Cell Plug
receives
the Breaker External
Harness Plug,
pro-
viding
a disconnectable means
of extracting the
signals from the Breaker.
A Wiring Harness
brings
the
signal to terminal blocks for
customer external
connections in the
Switchgear. Depending
on
the
Retrofit
Kit selected, up to three
(3)
terminal blocks
OB1,
TB2, and TB3)
are
provided.
3.12 Breaker Mounted
Control Power
Transformer
(CPT)
Digitrip RMS
610, 810, & 910 Retrofit
Kits are
available with an
optional Breaker Mounted
Control
Power
Transformer
(CPT),
which
provides
the 120
VAC input to the ATR
by tapping the Line
Side of
the Breaker
and
transforming
that voltage
to 120
VAC.
This option is widely
used because it
elimi-
nates the
need
to
run 120 VAC
control
power
from
cell to cell in the Switchgear.
I
ceuror.r
ISOLATE THE BREAKER
MOUNTED
CPT WHEN
DIELECTRIC TESTING
OF
BREAKER
/
SWITCHGEAR ASSEMBLY
IS PERFORMED
OR
THE
CPT MAY BE DAMAGED.
ElT.il
Effective
g/01
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