Table 83. Line Protection Fault Definitions - Eaton Power Xpert C445 User Manual

Table 83. Line Protection Fault Definitions

Definition Source
Over Voltage
When the line voltage to the Poor line quality.
motor exceeds the specified
rating.
Under Voltage
When the line voltage to the Poor line quality.
motor is below the specified
rating.
Result
An over voltage condition leads to a
lower than rated current draw and a
poor power factor. A trip limit of 110%
of rated voltage is recommended. Over
voltage can also lead to exceeding
insulation ratings.
An under voltage condition leads to
excessive current draw. This increases
the heating of the motor windings and
can shorten insulation life. A trip limit
set to 90% of rated voltage is
recommended.
Power Xpert C445 Global Motor Management Relay MN042003EN—October 2016 www.eaton.com
Appendix B—Troubleshooting and Diagnostics
Power Xpert Protection
Monitors the maximum rms value of
the three-phase voltages. If the rms value rises
above the set threshold for the set length of time, a
fault is detected and the overload can trip the
starter or send and display an alarm of the
condition. All line-related faults have
an "alarm-no-trip" mode.
Monitors the minimum rms value of the three-phase
voltages. If the rms value drops below the set
threshold for the set length of time, a fault is
detected and the overload can trip the starter or
send and display an alarm of the condition. All
line-related faults have an "alarm-no-trip" mode.
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