Circuit Breaker Checkout And Bench Test - Eaton Cutler-Hammer Digitrip RMS 510 Instructions Manual

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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