45
User Manual
MN013016EN
Effective July 2022
Magnum PXR and Power Defense SB low
voltage power circuit breakers user manual
EATON
www.eaton.com
Electrical operation functional test
ote:
N
Breaker accessory voltages can vary within the same breaker . Be sure
to review the accessory voltage rating before energizing as damage may
occur .
This test procedure is based on the assumption that the breaker is
equipped with optional shunt trip (ST), undervoltage release (UVR),
and/or spring release (SR) accessories (
) . If one accessory
is missing, substitute the manual button or manual charge handle to
replace the accessory’s function . If equipped with a motor operator,
the voltage is listed on the breaker nameplate .
Figure 73. Accessory viewing windows
Procedure
1.
Charge the breaker mechanism springs using the motor operator,
then if equipped with a UVR, energize the UVR with the rated
voltage .
2.
Close the breaker by applying rated voltage to the spring release
accessory and verify closing by noting the state of the indicating
flag .
3.
Charge the breaker mechanism springs using the motor operator .
If using the motor operator, after charging, remove power to the
motor operator to prevent automatic recharging .
4.
Open the breaker by applying rated voltage to the shunt trip
accessory .
ote:
N
If UVR is not installed, proceed to step 7 .
5.
With UVR energized, close the breaker using the spring release
accessory . The breaker should now be closed .
6.
Open the breaker by removing power from the UVR . The breaker
should now be open .
7.
Repeat this entire described test procedure three times .
Trip unit overload functional test
An overload simulation for trip unit testing can be achieved by using
the Power Xpert Protection Manager (PXPM) software . Testing prior
to startup should always be done with the circuit breaker either in
a de-energized system, or in TEST or DISCONNECTED cassette
position, or WITHDRAWN from cell . Note that the circuit breaker
must be carrying less than 5% of In prior to the test .
Figure 74. Power Xpert Protection Manager (PXPM) software.
Procedure
1.
Charge the breaker mechanism springs either using the charging
handle or the motor operator .
2.
Close the breaker by applying rated voltage to the spring release
accessory and verify closing by noting the state of the indicating
flag .
3.
Charge the breaker mechanism springs either by using the
charging handle or the motor operator . If using the motor
operator, disconnect power to it to prevent automatic recharging .
4.
Check the state of the pop-out trip indicator (if so equipped) is
“out” and then reset it .
5.
Press the CLOSE pushbutton to manually close the breaker . If
the indicator is “out”, then reset it .
6.
PXPM initiates the functional testing using secondary injection .
Navigate using the “Test Mode” icon to the test screen and
select the appropriate test conditions . Enter the requested
current and initiate the test by clicking on the “Test” button
(note that the password will be required) . Secondary injection
will start, and the trip unit will open the breaker based on the
configured settings . Results will be shown within the PXPM
software .
Verify that the trip indicator pop-out button (if so equipped) is
“out” and then reset it by pressing the pop-out button . The trip
unit then needs to be reset by the Reset pushbutton on the front
of the trip unit
Accessory viewing windows
