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Effective 10/2004
Page 45
I.L. 70C1036H05
Appendix B Troubleshooting Guide
Symptom
Probable Cause
Possible Solution(s)
Comments
No auxiliary power input.
LED display is not energized.
Wrong auxiliary power
voltage.
Check voltage input terminals A14-A15.
Refer to Section 1.6.1.
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.
As soon as current starts to
flow through the circuit
breaker, it trips and the
Instantaneous trip LED
comes on.
Trip unit is malfunctioning.
Replace trip unit.
Battery installed backwards. Install correctly.
Dead battery.
Replace battery.
LED does not come on when
battery check button is
pressed.
Trip unit is malfunctioning.
Replace trip unit.
There actually is a ground
fault.
Find location of the fault.
On 4-wire residual systems,
the neutral current sensor
may not have the correct
ratio or be properly
connected.
Check connections at terminals B4 and
B5. Check that the neutral current
sensor ratio matches the breaker. Check
that the connections from the neutral
current sensor to the circuit breaker are
not reversed. Check B6, B7 for correct
programming of jumper.
See Section 2.3,
Notes.
Circuit breaker trips on
ground fault.
Trip unit is malfunctioning.
Replace trip unit.
Connection from Zout to Zin
is missing.
Make connections B8 to B9.
Refer to Appendix A.
Trip unit settings are not
correct.
Change settings.
Circuit breaker trips too
rapidly on ground fault or
short delay (Zone Selective
Interlocking not used).
Trip unit is malfunctioning.
Replace trip unit.
Circuit breaker trips too
rapidly on long delay.
Long Time Memory
selected.
Trip unit settings are not
correct.
Disable Long Memory.
Change settings. Long Time Delay
setting is based on 6x
I
r
Circuit breaker trips longer
than time setting on Short
Delay and Ground Fault
The SLOPE setting is set
for I
2
T response (instead of
FLAT)
Determine whether I
2
T or FLAT is
desired. Check curve for correct time
delay if I2T SLOPE is desired.
See Figures 4.5, 4.8 or
curve
Test Method
1. Apply Aux Power to circuit breaker
and repeat test
See also NOTE inI.L.
29-885B Section 4.8
Circuit breaker trips higher
than ground fault setting
when field testing using
primary injection method
2. Connect circuit breaker poles in
series and repeat test
See Fig 5.4
EEROM
ALARM
Non fatal memory error
Note settings via view settings screen.
Then enter Program Settings and SAVE
CURRENT curve. If setpoint download
is successful press Reset. Re-verify
settings that you desire.
If alarm reappears
after trying the
possible solution,
replace trip unit at first
opportunity.