Siemens WL Series, Operating Instructions Manual

Page: 61 / 362

6 – 13
6.9 Troubleshooting
1)
Safety feature!
This remedy action amounts to a reversal (disabling) 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
close.
Ready-to-close indicator
shows:
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
effective For fused circuit breakers:
Replace defective fuses and press
reset 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
engaged in
operating position
(accessories)
Release "EMERGENCY OPEN" but-
ton
1)
by
rotating it
X X
9. Lockout effective against closing
when cubicle door is open (acces-
sories)
Close cubicle door
X X
10. Mutual mechanical circuit breaker
interlocks 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
shortly for reclosing
X
14. Racking handle withdrawn Rack circuit breaker into disconnected,
test or connect position, unlatch crank
and push crank fully in