GE AKR-30 Series Maintenance Manual page 26

SECTION 7-Breaker Maintenance (Cont.)
See ab
3.
Check resistance of the disconnected undervoltage
See
device. T le 5 for values.
instruction Sheet GEH-4545
mation, including schematic diagrams and circuit descrip­
tion.
The undervoltage device must be calibrated through the
time-delay unit after the device pick up has bee n adjusted.
.008
A
inch minimum closed g
mature and magnet as shown in Fig.
7 .8.3 24.
and Table
ELECTRIC LOCKOUT DEVICE
7.1 0
The electric lockout device utilizes an undervoltage
device to keep the breaker from resetting its mechanism if
the breaker is open and the undervoltage device coil is not
energized. The breaker thus cannot be closed unless
voltage is on the coli. Once the breaker is closed, loss of
voltage will not trip the breaker because, in the closed posi­
See
tion, a mechanical link is used to hold down the armature of
the device. Fig.
33.
means of electrically interlocking two breakers so that they
cannot be closed at the same time. Each undervoltage coil
may be wired in series with a
on the other breaker for cross-interlock purposes.
On each breaker having an electric lockout, an
will
ment is made which allow breaker closing with the coil
de-energized. This is provided to allow "start-up" on "dead"
34
systems. Figure shows this device. The push slide
shown is located in the opening in the lower part of the
escutcheon. This breaker door must be opened to gain
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access to it.
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.
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34 -
FIG. ELECTRIC LOCKOUT BY-PASS
26
for more detailed infor­
aiJ
must exist between the ar­
32C.
Refer to Section
This arrangement provides a
"B"
auxiliary switch contact
arran
MAIN SHAFT
CLOSED)
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.
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""' ·.
HOLD- IN . .
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'
33 -
FIG. ELECTRIC LOCKOUT DEVICE
BELL ALARM
7. 1 1
This device is used to give a remote indication of the
breaker's having tripped open through the action of one of
Its automatic protective devices. It will not be activated by
manual tripping or the action of the shunt trip.
mounted protective relay energizing the shunt trip will there­
fore not result in the remote alarm action.
The bell alarm circuit may be turned off by pushing in the
manual trip or by energizing the shunt trip. In the latter
a normally open contact of the bell alarm switch must be
wired in parallel with the
g e­
shunt-trip circuit Closing the breaker will also tum off the
alarm.
The bell alarm device may be equipped with a lockout
link which will lock the breaker open until the bell alam
device is reset.
The bell alarm is not a standard device and is supplied
only when specified on the breaker order.
OPERATION
7. 1 1 .1
Referring to Rg.
tivated by a crank which is asse m bled to the breaker's main
shaft. When the breaker opens, a pin attached to this crank
moves the alarm link against the switch
provided). This activates the switch contacts. It also
the locklever adjustment screw against the trip shaft padd l e
keeping the breaker trip free.
POINT
35 -
FIG.
"A"
auxiliary switch contact in the
35:
the bell alarm mechanism Is ac­
and
,40
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BELL ALARM DETAILS
A remotely
case,
moves
locklever Of