Eaton Power Xpert PXR 20 User manual

Power Xpert® Release trip unit for Magnum PXR circuit breakers
PXR 20/25 user manual
MN013015EN
PXR 20 PXR 25

ii POWER XPERT® RELEASE TRIP UNIT FOR MAGNUM PXR CIRCUIT BREAKERS MN013015EN January 2022 www.eaton.com
DISCLAIMER OF WARRANTIES AND LIMITATION OF LIABILITY
The information, recommendations, descriptions, and safety notations in this document are based on Eaton Corporation’s
(“Eaton”) experience and judgment and may not cover all contingencies. If further information is required, an Eaton sales
office should be consulted. Sale of the product shown in this literature is subject to the terms and conditions outlined in
appropriate Eaton selling policies or other contractual agreement between Eaton and the purchaser.
THERE ARE NO UNDERSTANDINGS, AGREEMENTS, WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING WARRANTIES
OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY, OTHER THAN THOSE SPECIFICALLY SET OUT IN ANY
EXISTING CONTRACT BETWEEN THE PARTIES. ANY SUCH CONTRACT STATES THE ENTIRE OBLIGATION OF EATON.
THE CONTENTS OF THIS DOCUMENT SHALL NOT BECOME PART OF OR MODIFY ANY CONTRACT BETWEEN THE
PARTIES.
In no event will Eaton be responsible to the purchaser or user in contract, in tort (including negligence), strict liability, or
other-wise for any special, indirect, incidental or consequential damage or loss whatsoever, including but not limited to
damage or loss of use of equipment, plant or power system, cost of capital, loss of power, additional expenses in the use of
existing power facilities, or claims against the purchaser or user by its customers resulting from the use of the information,
recommendations and descriptions contained herein. The information contained in this manual is subject to change without
notice.

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MN013015EN
POWER XPERT® RELEASE TRIP UNIT FOR MAGNUM PXR CIRCUIT BREAKERS MN013015EN January 2022 www.eaton.com
Contents
1. THE POWER XPERT RELEASE TRIP UNIT .............................1
1.1 System overview ...................................................1
1.2 Catalog numbering and styles .........................................1
1.3 Primary protection features ...........................................2
1.4 Enhanced protection features .........................................3
1.5 Current, voltage, frequency, power and energy data .......................3
2. TRIP UNIT DESCRIPTION ..........................................5
2.1 Status indicator ....................................................5
2.2 Display and menu navigation buttons ...................................5
2.3 Cause-of-Trip indicators ..............................................6
2.4 PXR 20 – Configure using rotary switches ...............................6
2.5 PXR 25 – Configure using the display...................................7
2.6 Maintenance mode switch ...........................................7
2.7 Reset button ......................................................7
2.8 Tamper proof cover .................................................7
2.9 Test and configuration port ...........................................7
2.10 Battery ..........................................................7
2.11 Breaker continuous current rating .....................................7
2.12 Real-time clock ...................................................7
2.13 Operating temperature .............................................8
2.14 Trip unit, frame, and voltage modules within the trip unit...................8
2.15 End user license agreement .........................................9
3. PROTECTION FUNCTIONS ........................................10
3.1 Password security .................................................10
3.2 Overload/long delay settings .........................................10
3.3 Short circuit settings ...............................................11
3.4 Instantaneous protection setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.5 High instantaneous (withstand) trip ...................................11
3.6 Ground fault settings...............................................11
3.7 Enhanced protection settings ........................................13
3.8 Maintenance mode ................................................14
3.9 Zone selective interlocking (ZSI) ......................................15
3.10 Making current release (MCR) ......................................16
4. COMPLEMENTARY FEATURES.....................................17
4.1 Neutral sensors ...................................................17
4.2 Configurable relays ................................................17
4.3 Integrated Modbus RTU ............................................19
4.4 Communications adapter modules (CAMs) .............................19
4.5 Auxiliary control power .............................................20
4.6 Secondary wiring terminals for Magnum PXR ...........................20

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MN013015EN
POWER XPERT® RELEASE TRIP UNIT FOR MAGNUM PXR CIRCUIT BREAKERS MN013015EN January 2022 www.eaton.com
5. POWER XPERT PROTECTION MANAGER SOFTWARE .................22
5.1 Setpoint configuration ..............................................22
5.2 Device settings ...................................................22
5.3 Test mode .......................................................22
5.4 Breaker information ................................................23
5.5 Real time data ....................................................23
5.6 Event summaries .................................................23
5.7 Reports .........................................................23
5.8 Application settings ................................................23
5.9 PXPM feature licenses .............................................23
6. MONITORING AND TESTING ......................................24
6.1 Monitoring from a supervisory system.................................24
6.2 Event recording and waveform capture ................................24
6.3 Health monitor....................................................26
6.4 Testing the circuit breaker and trip unit .................................26
6.5 Testing for ground fault trip units – primary injection ......................28
6.6 Testing within the switchgear ........................................28
7. MAINTAINING THE PXR TRIP UNIT .................................30
7.1 Troubleshooting ...................................................30
7.2 Replacing the trip unit ..............................................31
7.3 Replacing the battery ...............................................31
7.4 Changing the breaker rating..........................................32
8. DOCUMENTATION CROSS REFERENCE .............................33
9. MODBUS REGISTER MAP ........................................34
9.1 Modbus configuration ..............................................34
9.2 Real-time breaker status ............................................35
9.3 Real-time data registers ............................................35
9.4 Setpoint registers .................................................40
9.5 Remote control commands..........................................45
9.6 Date and time ....................................................46
9.7 Event registers ...................................................46
10. RECORDS AND FORMS..........................................49

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MN013015EN
POWER XPERT® RELEASE TRIP UNIT FOR MAGNUM PXR CIRCUIT BREAKERS MN013015EN January 2022 www.eaton.com

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MN013015EN
POWER XPERT® RELEASE TRIP UNIT FOR MAGNUM PXR CIRCUIT BREAKERS MN013015EN January 2022 www.eaton.com
WARNING
Dangerous electrical voltage!
Do not attempt to install or perform maintenance on
equipment while it is energized. Death or severe injury
can result from contact with energized equipment.
Always verify that no voltage is present before proceed-
ing. Always follow safety procedures. Eaton is not liable
for misapplication or misinstallation of its products.
Observe all recommendations, notes, cautions, and
warnings related to the safety of personnel and equip-
ment. Observe and comply with all general and local
health and safety laws, codes, and procedures.
WARNING
Do not attempt to install, test, or perform maintenance
on equipment while it is energized. Death or severe
personal injury can result from contact with energized
equipment. De-energize the circuit and disconnect the
circuit breaker before performing maintenance or tests.
Any tripping operation will cause disruption of service
and possible personal injury, resulting in the unneces-
sary switching of connected equipment. Testing a circuit
breaker while it is in-service and carrying load current
is not recommended. Testing of a circuit breaker that
results in the tripping of the circuit breaker should be
done only with the circuit breaker in the test or discon-
nected cell positions or while the circuit breaker is on a
test bench.
WARNING
Electrical shock or burn injury can occur when working
on power systems. Always turn off the main power that
is supplying the circuit breaker before conducting tests.
Test out of the cell, if possible.
CAUTION
Exercise care when replacing the battery to ensure that it is
installed correctly. Accidentally installing the battery in the
reverse direction will not harm the trip unit nor the battery,
but will defeat the function of the battery.
IMPORTANT
Auxiliary power is not required to provide current protection
features. Protection is active well below any overload. The
trip unit begins to power-up at very low levels of current at
approximately 40 A.
SUPPORT
Eaton provides technical support for the Magnum PXR
circuit breakers and trip units. You can contact us via several
methods. This link: www.eaton.com/eatoncare will take you
to the on-line portal where you can contact Technical Support
via phone, e-mail, or view FAQs.
For support via phone, you can call Eaton-Care and navigate
the menu by:
• Call 877-ETN-CARE (877-386-2273)
• Option 2 for the Technical Resource Center
• Option 2 for Circuit Protection Products
• Option 3 for Low-voltage and Medium-voltage Power
Circuit Breakers

1
1. The Power Xpert Release trip unit
POWER XPERT® RELEASE TRIP UNIT FOR MAGNUM PXR CIRCUIT BREAKERS MN013015EN January 2022 www.eaton.com
1. The Power Xpert Release trip unit
1.1 System overview
Power Xpert Release®(PXR) trip unit has features and flexi-
bility that allow configuration for a wide variety of protection
applications. The PXR is available in multiple models for the
Magnum PXR circuit breaker family. The models range from
simple current protection devices though more complex
protection, metering, and communication functionality.
Communication options support integration into a variety of
systems to monitor performance. Advanced metering of
currents, voltages, power, and energy allows evaluation of
real time energy use.
The PXR trip unit, along with sensors and a trip actuator,
provides the protective function. The PXR analyzes signals
from the sensors; if current level and time delay settings are
exceeded then the PXR trip unit will send a signal and trip
the circuit breaker. The automatic overload and short circuit
tripping characteristics for a specific circuit breaker are
determined by the current rating and user selected protec-
tion settings.
The internal current sensors consist of two coils; as current
begins to flow through the circuit breaker, the iron core
coil generates the energy which powers the trip unit. At
the same time, the air core coil provides signals which
are processed to determine the magnitude of current the
breaker is carrying. Auxiliary control power is not required
for current protection functions.
The mechanical action required to initiate tripping of the
circuit breaker is provided by a trip actuator, an integral part
of the circuit breaker mechanism, which also includes a
charging lever and mechanical trip button. The trip actuator
is automatically reset by the mechanism.
The master connection diagrams show how certain
functions of the trip unit are connected to external
circuits. All wiring is landed on the secondary connection
system directly above the circuit breaker. See Section 8
Documentation Cross Reference for the master connection
diagram document number and other related documents.
The PXR trip units are listed by Underwriters Laboratories
Inc. (UL) for use in Magnum PXR circuit breakers.
For more information on Magnum PXR low voltage power
breakers, please visit: www.eaton.com/magnumpxr.
Power Xpert Protection Manager (PXPM) software for the
PXR 20/25 provides cost savings and advanced functional-
ity. This intuitive user interface allows for simple trip unit
configuration, testing, and real time reporting of operating
conditions, including current, voltage, power, and energy.
The software also provides waveform captures, post event
logs, as well as the ability to check critical health perfor-
mance metrics.
Each PXR trip unit has embedded secondary injection and
testing features which run using a personal computer.
These unique features offer savings through labor hour
reduction and avoids the need for expensive proprietary
testing kits. PXPM’s extensive reporting features allow
saving configuration files and generating reports in PDF
format for sharing as well as in off-line configuration files for
use in restoring or replicating trip unit configuration.
For more information on Power Xpert Protection Manager
(PXPM) software, please visit: www.eaton.com/pxpm.
Power Xpert Dashboard (PXDB) provides a user-friendly
interface for interaction with multiple PXR 20/25s, legacy
trip units, meters, starters, and drives. Installed in your
switchboards, switchgear, and motor control centers, it is
the engine that produces the Power Xpert Dashboard user
interface. You can view the screens locally using an HMI
mounted in or near the switchgear or remotely by using a
standard web browser.
The PXDB control features allow you to safely monitor
and operate the PXR 20/25, as well as enable Arc Flash
Reduction Maintenance System™ (ARMS or Maintenance
Mode) remotely, increasing safety for all personnel.
For more information on Power Xpert Dashboard (PXDB),
please visit: www.Eaton.com/PXDashboard.
1.2 Catalog numbering and styles
This user manual applies to the following trip unit catalog
numbers (see Table 1).
Table 1. Catalog styles.
Trip unit Trip unit catalog
number Breaker catalog digit 13, 14 Protection ARMs Communication Metering
PXR 20 PXR20VN30LNNC 2A LSI NAdapter module (CAM) Current
PXR20VN30LGNC 2C LSIG NAdapter module (CAM) Current
PXR20VN30LNAM 2H LSI YModbus RTU & CAM Current
PXR20VN30LGAM 2F LSIG YModbus RTU & CAM Current
PXR 25 PXR25VN30LNAM 2Q LSI YModbus RTU & CAM Current, voltage, power, energy
PXR25VN30LGAM 2S LSIG YModbus RTU & CAM Current, voltage, power, energy
Note:
LSI = Long, short, and instantaneous protection are available.
LSIG = Long, short, instantaneous, and ground protection are available.
CAM = Communication adapter module, see Section 4.4 Communications adapter modules (CAMs).

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1. The Power Xpert Release trip unit
POWER XPERT® RELEASE TRIP UNIT FOR MAGNUM PXR CIRCUIT BREAKERS MN013015EN January 2022 www.eaton.com
1.3 Primary protection features
The Time-Current Curves (TCC) for the PXR 20/25, when
used in Magnum PXR circuit breakers, are found in
document TD013172EN. All protection settings shall be
made by following the recommendations of the specifying
engineer in charge of the installation.
Table 2. Primary protection features.
Protection PXR 20 PXR 25
Overload
protection
(long delay)
(L) ANSI 51P
Long delay pickup x (In)0.4, 0.5, 0.6, 0.7, 0.75, 0.8, 0.9,
0.95, 0.98, 1.0
0.4 to 1.0 in steps of 0.01
Long delay time @ 6 x (Ir) Seconds 0.5, 1, 2, 4, 7, 10, 12, 15, 20, 24 0.5 to 24in steps of 0.1
Long delay thermal memory Enable/disable
High load alarm 1 % x (Ir)OFF or 50% to < high load alarm 2 in steps of 1.0%
High load alarm 2 % x (Ir)OFF or > high load alarm 1 to 120% steps of 1.0%
Short circuit
protection (S)
ANSI 50TD
ZSI ANSI 68
Short delay slope Flat, I2tFlat, I2t
Short delay pickup x (Ir)1.5, 2, 2.5, 3, 4, 5, 6, 7, 8, 10 1.5 to 10 in steps of 0.1
Short delay time I2t @ 8 x (Ir)Seconds 0.1, 0.3, 0.4, 0.5 0.05 to 0.5 in steps of 0.01
Short delay time flat Seconds 0.05, 0.1, 0.2, 0.3, 0.4, 0.5 0.05 to 0.5 in steps of 0.01
Short delay zone interlock Enable/disable
Neutral
protection
ANSI 50N
ANSI 51N
4th pole or external neutral % x (Ir)OFF, 60, 100 OFF, 60, 100
Instantaneous
protection (I)
ANSI 50P
Instantaneous pickup x (In)OFF, 2, 4, 5, 6, 7, 8, 10, 12, 15 OFF, 2 to 15 in steps of 0.1
Making current release level
determined by frame
A Y
Ground
(earth) fault
protection (G)
ANSI 51G
ZSI
ANSI 68
Ground protection Residual/source ground or zero sequence
Ground fault pickupb- trip (Ig) x (In)0.2, 0.4, 0.6, 0.8, 1.0 0.2 to 1.0 in steps of 0.01
Ground fault pickupb- alarm x (In)OFF, 0.2, 0.4, 0.6, 1.0 OFF, 0.2 to 1.0 in steps of
0.01
Ground fault delay I2t @
0.625 x (In)
Seconds 0.1, 0.2, 0.3, 0.5, 1.0 0.1 to 1 in steps of 0.01
Ground fault delay flat Seconds 0.05, 0.2, 0.3, 0.5, 1.0 0.05 to 1 in steps of 0.01
Ground fault zone interlock Enabled with ground fault pickup
Ground fault thermal memory Enable/disable
Ground fault pre-alarm %50 to 100 of Ig in steps of 1.0
Maintenance
mode
protection
(ARMS) (A)
ANSI 50
Switch positions ON or remote
LED lights when enabled
Maintenance mode pickupcx (In)1.5, 2.5, 4.0, 6.0, 8.0, 10.0
Relay contact for remote
indication of mode
Y
Notes:
If I4T slope is selected not all times are available, consult time-current curves.
bGround fault pickup is limited to a maximum of 1200 A for ANSI/UL/CSA versions to comply NEC® standards. See Section 3.6 - Ground fault settings for a
complete description of the settings.
cMaintenance mode pickup maximum setting may be limited based on rating In.

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1. The Power Xpert Release trip unit
POWER XPERT® RELEASE TRIP UNIT FOR MAGNUM PXR CIRCUIT BREAKERS MN013015EN January 2022 www.eaton.com
1.4 Enhanced protection features
Table 3. Enhanced protection features.
Enhanced protection (PXR 25 only) Units Settings
ANSI 59 Voltage protection Over voltage pickup Volts 180 to 720 in steps of 1 Three modes of operation are
selectable for these protection
functions:
OFF, Alarm, or Trip.
Over voltage delay Seconds 1 to 300 in steps of 1
ANSI 27 Under voltage pickup Volts 60 to 670 in steps of 1
Under voltage delay Seconds 1 to 300 in steps of 1
ANSI 47 Voltage unbalance pickup % volts 5 to 25 in steps of 1
Voltage unbalance delay Seconds 1 to 300 in steps of 1
ANSI 46 Current protection Current unbalance pickup % Amps 5 to 25 in steps of 1
Current unbalance time Seconds 1 to 300 in steps of 1
ANSI 78V Phase loss pickup % amps 75
Phase loss delay Seconds 1 to 240 in steps of 1
ANSI 32R Power protection Reverse power pickup kW 1 to 65,500 in steps of 1
Reverse power delay Seconds 1 to 300 in steps of 1
1.5 Current, voltage, frequency, power and
energy data
Both the PXR 20 and PXR 25 provide real time metering
information regarding the loads being protected. The
PXR 25 includes monitoring of voltage and phase angle to
support power and energy data. All accuracy requires
control power (AUX) to the trip unit and is specified for a
3-phase balanced load.
Table 4. Metering data (continued).
Current metering in the PXR 20 & PXR 25 Units Accuracy
IA, IB, IC, INa, IG Amperes ± 0.5% of reading
Over the range of 10% to 120% x Inat 25°C (77°F).
Minimum IA, IB, IC, IN, IG Amperes
Maximum IA, IB, IC, IN, IG Amperes
THD for IA, IB, IC, IN %
Demand IA, IB, IC, IN, IG Amperes
Demand Max. IA, IB, IC, IN, IG Amperes
Voltage metering in the PXR 25 Units Accuracy
VAB, VBC, VCA (line to line) Volts ± 0.5% of reading
Over the range of 102 to 690 Vac line-to-line at 25°C
(77°F).
Minimum VAB, VBC, VCA Volts
Maximum VAB, VBC, VCA Volts
THD for VAB, VBC, VCA %
VAN, VBN, VCN (line to neutral) Volts
Minimum VAN, VBN, VCN Volts
Maximum VAN, VBN, VCN Volts
.

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1. The Power Xpert Release trip unit
POWER XPERT® RELEASE TRIP UNIT FOR MAGNUM PXR CIRCUIT BREAKERS MN013015EN January 2022 www.eaton.com
Table 4. Metering data (continued).
Power metering in the PXR 25 Units Accuracy
Real kW ± 1% of reading
Over the range of 20% to 120% x In, 102 to 690 Vac
line-to-line PF: 0.8 leading to 0.5 lagging at 25°C
(77°F).
Apparent kVA
Reactive kvar
Real demand kW
Apparent demand kVA
Reactive demand kvar
Real demand (peak) kW
Apparent demand (peak) kVA
Reactive demand (peak) kvar
Energy metering in the PXR 25 Units
Real total (forward + reverse) kWh
Real net (forward – reverse) kWh
Real forward (delivered by source to load) kWh
Real reverse (delivered by load to source) kWh
Apparent energy kVAh
Reactive received (in quadrant 3 & 4) kvarh
Reactive delivered (in quadrant 1 & 2) kvarh
Reactive total (delivered + received) kvarh
Reactive net (delivered – received) kvarh
Note:
aNeutral current accuracy for internal sensor (4 pole) breakers.
Please note that maximum and minimum values are held
until reset using PXPM or the display. Demand values
are on a configurable fixed or sliding window of 5 to 60
minutes.
The power and energy metering and the protection func-
tions are calculated with the convention that power flow is
from line to load through the circuit breaker. This assumes
the top side conductor to be the line side. If the distribution
system is configured such that the bottom side is the line
side, the power values will indicate reverse power. This
can be changed by using the display and navigation button.
Navigate to the Edit Settings menu and under Power Feed,
select Forward or Reverse.