Eaton Cutler-Hammer Digitrip RMS 510 - Circuit Breaker Checkout and Bench Test

AD 33-855-4
8.8
Circuit
Breaker Checkout
and
Bench
Test
Before
the Breaker
is returned
to the Switchgear
for
placement into service,
the
Retrofit
Kit
installa-
tion must
be
checked
out
and
tested' Check
all
Breaker
Retrofit
wiring
paths
to be sure
that
they
are
properly routed
and free
from
potential
inteder-
ence
with
moving
pads
within
the
Breaker.
Confirm
that
all
Wiring
Harness
terminations
are
secure.
Perform
several
Breaker
Manual
Close
and
Overcurrent
Trip Operations.
This
test can be
per4ormed using
any
of the
above
described
test
methods.
An
effective
installation
checkout
and
test
procedure should
include
the
following.
1. Select
and
set
the
proper,
user
determined
Overcurrent
Trip
Settings
for
the
Digitrip
RMS
Trip Unit.
Verify the
Trip Unit
is
in calibration
by
seiecting
and
testing several
trip
points
(as
applicable)
on
the Long
Delay,
Shod
Delay,
lnstantaneous,
and
Ground
Fault
Time
podions
of
the Digitrip
RMS
Trip Curve'
Record
the
Trip
Unit settings
for
permanent record
and
future
reference.
Reset
the Trip
Unit
after
testing
or
the Rating
Plug
battery
will discharge.
Verify the
Direct
Trip
Actuator
(DTA)
properly
resets.
The
Breaker
will
not close
unless
the
DTA
resets.
For Breakers
equipped
with
Overcurrent
Trip
Switches
(OTS),
confirm
the
proper
operation
of
the OTS.
When
the Breaker
trips
on an
overcurrent
condition,
the OTS
must
latch and
its contacts
change
state.
lf not, adjust
the
OTS as
detailed
in OTS
Adjustment
Procedures
in
manufacturer's
original
instructions
that accompanied
the
Breaker
or
Switchgear.
Manually
reset
the OTS
after each
trip
through
the
push
button
on
the Breaker
Faceplate
or
electrically,
if applicable,
by energizing
the OTS
Beset
Coil.
Before
returning
the
Breaker
to
the Switchgear
after
Breaker
bench
testing
has
been
completed,
lever the
Breaker
element
levering
mechanism
from
the
"TEST"
position
to
the
"DISCONNECT"
posi-
tion.
Confirm
the
Breaker
position
indicator
reads
"OPEN"
and
the spring
charged
indicator
reads
"DISCHARGED",
J.
ElT.il
Effective
9/01