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6.9 Troubleshooting
1)
Safety feature!
This remedy action amounts to a reversal (disab
ling) of a safety precaution
installed earlier. Please ensure that such disabling is now permissible / authori-
zed!
Fixed-moun-
ted breaker
Draw-out
breaker
Disturbance Possible Cause(s) Remedy
X X
Circuit breaker cannot be
closed.
Circuit breaker not ready to
cl
ose.
Ready-to-close indicator
sh
ows:
1. Spring not charged Charge spring
X X
2. Undervoltage release not ener-
gized.
Energize undervoltage release
X X
3. Mechanical open fuse lock-out
eff
ective
For fused circuit breakers:
Replace defective fuses and press
r
eset button
X X
4. Electrical closing interlock effective
Shut off control voltage for interlocking
1)
X X
5. "
Safety OPEN" locked with cylin-
der lock
(accessories)
Unlock
1)
X X
6. "
Safety OPEN" locked with pad-
locks
(accessories)
Remove padlocks
1)
X X
7. "OPEN" button locked off
(accessories)
Unlock the "OPEN" button
1)
X X
8. "EMERGENCY OPEN" button
enga
ged in
operating position
(accessories)
Release "EMERGENCY OPEN" but-
ton
1)
by
rotating it
X X
9. Lockout effective against closing
whe
n cubicle door is open (acces-
sories)
Close cubicle door
X X
10. Mutual mechanical circuit breaker
inter
locks effective (accessories)
Open second circuit breaker or rack
into disconnected position
1)
X X
11. Electronic
trip unit missing or
incorrectly installed
Install electronic
trip unit properly
X X
12. Shunt trip energized
Deenergize shunt trip
X X
13. Close coil energized
Closing coil has to be deenergized
shor
tly for reclosing
X
14. Racking handle withdrawn Rack circuit breaker into disconnected,
test or conne
ct position, unlatch crank
and push crank fully in
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