Undervoltage Lockout Device; Instantaneous Under-Voltage Tripping Device; Thermostat Wiring Diagram - GE AK-2-50 Maintenance Manual

relay of the "control box to instantaneously trip the
breaker through .a normally closed "Z" contact
in series with the undervoltage device mounted
on the breaker.
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Fig. 24 (102C3699) Thermotector Wiring
· ·Diagram
-
"Warning": Do not use bell set to check con-
. tinuity of bridge circuit in static time delay
box, only a volt-ohm meter or vacuum tube
volt meter should be used • .
In the· event the device · fails to _ pick-up, the
following checks are recommended to · determine
whether the magnetic device on the breaker or
the static time delay unit is the faulty component.
A. - ·check input vo1tag· e s ·across terminals 1
&
2 on static box. These voltages should be
B.
as follows: ·
1. - Device 177L316 G~12-208 or 230 volts
A.c • .
2. Device 177L316 G-14-125 volts D.C.
3. Device 177L316 G--15-250 volts D.C.
Check output voltages on terminals 4
&
5
with the under voltage device connected.
The approximate voltages are as follows:
1.
208 Volt A. C. . 177L316 G-12- 110
Volts D. C.
230VoltA.C. 177L316G-12-120D.·C.
Volts D. C.
2. 125 Volt D. C. 177L316 G-14 50 Volts
D. C.
3. 250 Volt D. C. 177L316 G-15- 100
Volts D. C • .
Low Voltage Power Circuit Breakers GEK-7303
.. c.
The resistance of the under voltage coils
are as follows: . ·
1.
6275081 G-59 - 1830 Ohms.
2:
6275081 G-61 -.440 Ohms.
REPLACEMENT
1. Disconnect coil leads.
2. Remove four mounting screws (21) and
remove device.
3. Install new device in reverse order.
Coil (ls)
1. Disconnect leads to coil.
..
2. Remove two screws (16).
3.
Re~ove magnet and coil assembly.
4. Straighten laminations around shading ring
·(5).
· 5. Remove shading ring and straighten lower
end of coil _ c lamp (13). .
6. ·Remove· coil. Install new coil in reverse
order. · ·
-
· INSTANTANEOUS UNDER-
VOLTAGE TRIPPING DEVICE
The instantaneous undervotage device is mounted
in the same location and manner as the static time-
delay_. d~vice . and . its construction is -similar.
.
.
The adjustments and re_place~ent of this device
are the same as those described above -for the
static time-delay undervoltage device.
UNDERVOLTAGE LOCKOUT DEVICE
(~ig. 25) . ·
The undervoltage lockout device holds an open
breaker trip-free when the coil of the device is de-
energized. · When the breaker is
in
the closed
position, ~inkage operated by the breaker mech-
anism cam positions -itself to mechanically hold ·
the undervoltage device armature
in
the closed
air gap position to prevent tripping the breaker
in the event the undervoltage device
coil
is cie-
energized. This feature when used in conjunction
with normally-closed. aux:Uiary contacts of an
alternate breaker presents a convenient method·
of mechanically interlocking two or more breakers
to assure that no two breakers may be closed
at the same time.
The undervoltage lockout device is mounted on
the right side of the mechanism frame (7) (looking
from the front). This device is identical to the
standard instantaneous unde~oltage trip device,