Eaton 520, Руководство по эксплуатации

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29
Instruction Leaflet IL01301051E
effective September 2013
Operating Manual for Series NRX
Trip Units - Digitrip™ 520/520M
EATON www.eaton.com
Appendix B: Troubleshooting
Symptom Probable Cause Possible Solution(s) References
Unit Status LED is
not blinking
Current through breaker is <100A
(single-phase) or 35A (three-phase)
No problem. Status LED will not operate
with breaker currents <<100A (single-
phase) or 35A (three-phase)
Trip unit is malfunctioning Replace trip unit
Unit Status LED is
steadily on
Light loading No problem. Status LED will not flash
until
above 35A
See Section 2 note for trip and operational indicators
Trip unit is malfunctioning Replace trip unit
When current starts flowing through
the breaker, it trips. The orange (not
red) instantaneous trip LED lights
Rating plug is not installed or is
loose
Install rating plug and/or check for loose
connections
Rating plug is open internally Replace rating plug
LED does not light when Battery
Check button
is pressed
Battery installed backwards Install correctly See Section 5
Dead battery Replace battery
Fram module is malfunctioning Contact Eaton
Breaker trips on
ground fault
There actually is a
ground fault
Find location of the fault
On three-pole, four-wire residual
systems, the neutral current sensor
may not have the correct ratio or be
properly connected
Check connections at terminals 15 and
16. Check that the connections from the
neutral current sensor to the breaker are
not reversed. Check terminal 19 and 20
for correct programming of jumper
See Section 2 notes for ground fault protection
See Table 5-8
High inrush phase currents may
cause fictitious ground pickup
momentarily
If zone interlocking function is employed,
connect Zout to Zin jumper to provide
some time delay
Refer to Appendix A for zone selective interlocking
Trip unit is malfunctioning Replace trip unit
Breaker trips too rapidly on ground
fault or short delay
Zone interlock signal is not present Check wiring connections Refer to Appendix A and Section 2 zone selective
interlocking
Trip unit settings are
not correct
Change settings
Trip unit is malfunctioning Replace trip unit
Breaker trips too rapidly on long
delay
Long Time Memory selected Turn off Long Time Memory Refer to Section 3 for Long Delay Time setting
Trip unit settings are
not correct
Change settings. Long Time Delay setting
is based on 6 × I
R
Breaker trips with orange (not red)
LED above
long verbiage
High temperature Trip encountered Check application connections, venting,
etc.
Cause of Trip LEDs flashing and
breaker is closed
Trip unit was not reset from previous
event or test
Depress Reset pushbutton to clear LED
flashing
See below
Battery voltage too low to reset latch
chip and LEDs
Replace battery See Section 5 for battery check
A Cause of Trip LED
keeps retriggering in
the application
Digitrip memory buffer not
completely reset
Need to reset Digitrip unit when Status
LED is operational. Possibly do this by
temporarily (or permanently) adding
auxiliary power and then depress Reset
pushbutton to fully clear trip buffer
See Section 2 mode of trip and status information
Status LED is red continuously or
flashing red
Circuit breaker MCR (b) auxiliary
switch not indicating proper state
Check auxiliary switch for continuity Refer to Appendix E or F master connection diagram
Circuit breaker mechanism not
properly closing
Check with factory
Trip actuator coil not connected (coil
supervisor alarm)
Check coil connector R5 and check coil
resistance
Internal memory problem Replace Digitrip unit