Symptom
Probable Cause
Possible Solution(s)
References
Breaker trips with orange (not red) LED
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 circuit
on the cause of trip LEDs
Replace battery
See Section 9: Trip unit battery for
battery check
LCD display is not energized
No auxiliary power
(24 Vdc) on terminals 21 and 22
Check voltage input terminals
Refer to Section 5: Principles of
operation for power supply operation
Status LED is red continuously or
flashing red
Circuit breaker MCR auxiliary switch not
indicating proper state
Check auxiliary switch for continuity
Refer to Section 5: Display Module
Interface
Circuit breaker mechanism not properly
closing
Check with your Eaton representative for
factory assistance.
Trip actuator coil not connected (coil
supervisor alarm)
Check coil connector R5 and check coil
resistance
Internal memory problem
Replace Digitrip unit
Circuit breaker tripping and orange LED (not
red) illuminated next to SHORT text.
Circuit breaker MCR auxiliary switch not
indicating proper state
Check MCR switch or check with your Eaton
representative for factory assistance.
Refer to Section 5: Display Module
Interface
Circuit breaker mechanism not closing
properly
Check with your Eaton representative for
factory assistance.
Refer to Section 11: Maintenance Mode
feature for diagnostics
Maintenance Mode
will not shut off
Faulty remote switch or
local switch
Verify remote switch or
local switch is not on
Refer to Section 11: Maintenance
Mode feature and TD 01301014E for
maintenance mode wiring connections
Maintenance mode was initially enabled by
communications and communications link is
not available.
Restore communications link if possible and
check for possible wiring errors.
Enter programming mode and change
setting to disable Maintenance Mode
When View Set Comm Settings is selected
display message reads “Timed Out Press
Escape”
No CAM module is connected
Without a CAM module Communications
settings are not applicable.
CAM module is connected
Check to see if +24 Vdc supply is connected
to CAM module and within regulation.
Check all wiring to CAM module
When View Set Time is selected display
message reads “Time Not Valid”
Real Time Clock is not programed
Go in to the program settings menu and set
the clock
When View Set PGM Transfer is selected
display message reads “CAM Upload”
and “CAM Download” in a light gray and
neither can be selected.
No CAM module is connected
Without a CAM module Downloading or
Uploading of setpoints is not possible.
CAM module is connected
Check to see if +24 Vdc supply is connected
to CAM module and within regulation.
Check all wiring to CAM module
Display shows “Diagnostic Warning #x
Alarm” There are several x numbers
corresponding to different diagnostic
checks.
Internal trip unit check may have detected
excessive noise, EMC interference,
harmonics or one of the diagnostic checks
did not pass.
Press and hold Reset button on front of trip
unit for 2 seconds. If display is cleared
and does not return after 5 minutes the
issue was transient. If the display message
returns after reset, check with your Eaton
representative for factory assistance.
Effective September 2013
Instructional Leaflet IL01301064E
Operating Manual for Series NRX
Digitrip Trip Units 1150 / 1150i
41
EATON
www.eaton.com
