Special Consideration For Ground Fault Test; Maintenance Mode Protection - Eaton Power Xpert Release PXR 10 Manual

3 Protection setting description
Ground (earth) sensing method
Residual
Source ground / zero sequence

3.5 Special consideration for ground fault test

3.5.1 NEC requirements and UL standards
The National Electric Code (NEC) under Article 230-95-C requires that any ground-fault
protection system be performance tested when first installed. UL Standard 489 amd 1053
specify that instructions for ground fault testing accompany each ground fault protection
system. Please consult Instruction leaflet number IL012125EN available at www.eaton.com/
powerdefense to aid you in ground fault testing the Power Defense circuit breaker.

3.6 Maintenance mode protection

The PXR trip units support Eaton's Arc Flash Reduction Maintenance System (ARMS), also
known as maintenance mode. When maintenance is being performed and the ARMS is
enabled, the trip unit will trip the breaker with no intentional delay whenever the configured
pickup level is exceeded. The maintenance mode protection overlays the LSI protection
functions and operates in parallel. If maintenance mode causes the circuit breaker to trip,
the "INST" indicator will be illuminated and the "Maintenance Mode Trip" message will be
displayed if the style of trip unit has a display.
The maintenance mode pickup level setting is configured using the UI or PXPM software.
They range from 2.5 (most protective) to 10, expressed as a multiplier of In. The adjustable
current settings allow for different levels of protection. A higher level may be needed when,
for example, another load fed from the ARMS protected breaker may contain motors that
are being started and create large inrush currents over the lowest trip current level. The
selection of one of the reduction settings should be determined and selected by a person
who is experienced in power system analysis.
3.6.1 Actuating and indicating maintenance mode protection
There are three ways to actuate the maintenance mode function, locally, remotely using a
contact, or remotely using communications. A blue LED on the trip unit always illuminates
to confirm when the function is enabled.
12
PXR tRiP units foR PoweR Defense molDeD case ciRcuit bReakeRs MN012007EN June 2018 www.eaton.com
frame
PD2 – up to 100 A w/o bus-bar
PD2 – 100 to 225 A w/o bus-bar
PD2 – up to 100 A
PD2 – 100 to 225 A
PD3
PD4
PD5
PD6
All
sensor catalog #
PDG2XNCTD0100
PDG2XNCTD0225
PDG2XNCTB0100
PDG2XNCTB0225
PDG3XNCTB0600
PDG4XNCTB0800
PDG5XNCTB1200
PDG6XNCTB2500
Tbd