Troubleshooting - Siemens UL 489 Operating Instructions Manual

6.9

Troubleshooting

Fixed- Draw-out
'mounted circuit
breaker breaker
X X
X X
X X
X X
X X
X X
X X
X X
X X
X
X X
X X
6 – 12
Disturbance
Circuit breaker cannot be
closed.
Circuit breaker not ready to
close.
"Ready-to-close" indicator
shows:
Possible cause(s)
1. Closing spring not charged
2. Undervoltage release not ener-
gized.
3. Electrical closing interlock 
effective
4. Key lock engaged 
(optional accessory)
5. Padlocks installed
6. "EMERGENCY OPEN" button
engaged in operating position
(accessories)
7. Lockout effective against closing
when cubicle door is open 
(accessories)
8. Electronic trip unit missing or
incorrectly installed
9. Shunt trip energized
10. Racking handle withdrawn
11. Closing coil energized
12. Mutual mechanical circuit breaker
interlocks effective (accessories)
Remedy
Charge closing spring
Energize undervoltage release
Switch off control voltage for 
interlocking
Unlock
Remove padlocks
Release "EMERGENCY OPEN"
button by rotating it
Close cubicle door
trip unit
Install electronic properly
De-energize shunt trip
Rack circuit breaker into discon-
nected, test or connected position,
unlatch crank and push it fully in
Closing coil has to be deenergized
shortly for reclosing
Open second circuit breaker or rack
into disconnected position