Effective 7/1/2003
Page 36
I.L. 70C1037H04
Symptom
Probable Cause
Possible Solution(s)
References
Trip Unit was not reset from
previous event or test.
Depress Reset Pushbutton to
clear LED flashing
Cause of Trip LEDs flashing
and breaker is closed
Battery voltage too low to
reset latch chip and LEDs
Replace battery
See Section 6.2
A Cause of Trip LED keeps
retriggering in the application
(Digitrip 520M and 520MC)
Digitrip Memory Buffer not
completely reset
Need to reset Digitrip unit
when Status LED is
operational. Possibly do this
by temporarily ( or
permanently) adding Aux
Power and then depress
Reset pushbutton to fully clear
trip buffer.
See also Note in Section
5.3.2.2
Light load.
Check breaker ordering
information.
Refer to Sections 1.6 and
1.6.1
LCD Display is not energized.
No auxiliary power unit.
Check voltage input terminals
A14 – A15.
Refer to Sections 1.6 and
1.6.1
Wrong Address
Check Address
See Section 4.9
Check for Aux. Power – A14,
A15
No Power
Check Status LED and
Transmit LED
See Figure 1.1 and Refer to
Section 1.6
Check Communications
Wiring – B1, B2
See Appendix C
Circuit breaker containing
Digitrip 520MC* does not
communicate with PowerNet
or BIM.
* Only Digitrip 520MC styles
have communication features.
Hardware Problem
Missing Termination Resistor
See Figure 4.9
