Siemens 3ZX1812-0WL00-0AN2, Operating Instructions Manual

Page: 54 / 364

6 – 13
6.9 Troubleshooting
1)
Safety feature!
This remedy action amounts to a reversal (disabling) of a safety
precaution installed earlier. Please do ensure that such dis-
abling is now permissible / authorized!
Fixed-
mounted cir-
cuit- breaker
Draw-out
circuit-
breaker
Disturbance Cause Remedy
X X Circuit-breaker cannot be closed
and circuit-breaker not ready to
close.
Ready-to-close indicator shows:
1. Spring not charged Charge spring
X X 2. Undervoltage release not
energized
Energize undervoltage release
X X 3. Mechanical reclosing lock-out
effective
Rectify cause of overcurrent trip-
ping and press reset button
X X 4. Electrical closing interlock
effective
Switch off control voltage for inter-
locking
1)
X X 5. "OFF" locked off by cylinder
lock
(accessories)
Unlock
1)
X X 6. "OFF" locked off by
padlocks
(accessories)
Remove padlocks
1)
X X 7. "Mechanical OFF" button
locked off
(accessories)
Unlock the "Mechanical OFF"
button
1)
X X 8. "EMERGENCY OFF" button
engaged in operating position
(accessories)
Release "EMERGENCY OFF"
button
1)
by rotating it
X X 9. Lockout against closing with
cubicle door open effective
(accessories)
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 overcurrent release
(trip unit) missing or incorrectly
installed
Fit electronic overcurrent release
properly
X X 12. Shunt trip energized De-energize shunt trip
X X 13. Closing coil energized Closing coil has to be de-energized
shortly for reclosing
X 14. Racking handle withdrawn Rack circuit-breaker into discon-
nected, test or connected position,
unlatch crank and push it fully in