Table of Contents
Advertisement
3 Line protection setting description
2.5 PXR 10 motor protection simplified rotary switches
The PXR 10 motor protection trip curve configuration is simple, using the switches on the
front panel. MLSI trip units have three rotary switches. The yellow color rotary switch sets
the full load amps FLA I
(A) and the red switches trip profile and Instantaneous l
(X le).
e
sd
Details regarding the available protection settings for each frame are found in Section 9:
Available protection settings.
3 Line protection setting description
The PXR trip unit protection settings are easily customized to any application. Settings
for long delay pickup, long delay time, short delay pickup, short delay time, instantaneous
pickup, ground fault pickup, and ground fault time are all configurable. These functions are
set using PXPM software, or rotary switches or the UI on the front of the trip unit.
Maximum and minimum settings will vary by trip unit style and breaker frame. A summary
of the available settings by PXR model and breaker frame is shown in Section 1.1, please
consult the detailed tables within Section 9: Available protection settings.
Before placing any circuit breaker in operation, set each trip unit protection setting to the
values specified by the engineer responsible for the installation.
3.1 Long delay pickup and time setting
The PXR trip unit offers a wide range of settings for long delay pickup (LDPU or I
). The
r
actual pickup value for long delay will be 110% of the set point value with a +/- 5% tolerance
to ensure that the circuit breaker can carry the full rating of (I
), without tripping.
r
The long delay time setting value represents the clearing times when the current value
equals six times (I
). All times are referenced from the top of the tolerance band, ensuring
r
that the time never exceeds that maximum setting.
I
is also the base for the short delay current setting.
r
10
PXR tRiP units foR PoweR Defense molDeD case ciRcuit bReakeRs MN012007EN March 2019 www.eaton.com
Hide quick links:
Advertisement
Table of Contents
