6 – 19
6.10
Troubleshooting
Draw-out
breaker
Disturbance
Possible Cause(s)
Remedy
X
Circuit breaker cannot be
closed.
Circuit breaker
not
ready to
close.
Ready-to-close indicator
shows:
1.
Spring not charged
Charge spring
X
2.
Undervoltage release not
energized.
Energize undervoltage release
X
3.
Mechanical open fuse lock-out
effective
For fused circuit breakers:
Replace defective fuses and press
reset button
X
4.
Key lock engaged
(optional accessory)
Unlock
X
5.
Padlocks installed
Remove padlocks
X
6.
"EMERGENCY OPEN"
button engaged in operating
position (accessories)
Release "EMERGENCY OPEN"
button by rotating it
X
7.
Lockout effective against closing
when cubicle door is open
(accessories)
Close cubicle door
X
8.
Electronic
trip unit
missing or
incorrectly installed
Install electronic
trip unit
properly
X
9.
Racking handle withdrawn
Rack circuit breaker into disconnected,
test or connect position, unlatch crank
and push crank fully in
X
10. Mutual mechanical circuit breaker
interlocks effective (accessories)
Open second circuit breaker or rack
into disconnected position
Summary of Contents for UL 1066
Page 56: ...7 5 7 2 Frame size II fused ...
Page 58: ...7 7 ...
Page 63: ...7 12 8 27 210 0 8 27 210 0 8 27 210 0 3 75 95 2 ...
Page 64: ...7 13 ...
Page 65: ...7 14 7 7 Frame size III fuse carriage ...
Page 66: ...7 15 ...
Page 69: ...7 18 7 9 External sensor for neutral conductor WLNCT2 ...
Page 70: ...7 19 WLNCT3 ...
Page 85: ...9 5 I tripping Ground fault tripping ...
Page 231: ...15 12 Pre assembling the locking module Installing 0767 1 2 3 4 6 5 ...
Page 232: ...15 13 1 Socket head cap screw M5 with washer and nut 7 8 Size 4 5 Nm 45 lb in ...
Page 289: ...23 7 23 3 3 Installing arc chutes 1 2 6 5 PH 2 0043 02 3 4 5 6 For frame size III 3 PH 2 ...
Page 298: ...23 16 6 7 8 9 5 2 1 Size 5 mm ...
Page 333: ......