Protective. Devices; Time Delay Undervoltage Tripping Device - GE AK-1-15 Instructions Manual

Air Circuit Breakers
Type
AK... l-15 and AK-1-25 GEH..;1807
3. RelDove four screwa(7) which attach lower
pa~,t of magnet to upper part of magnet.
4. Remove two screws which attach upper
part of .magnet to the two side frames of
the operating mechanism.
5. Ins.tall new closing solenoid in reverse
order.
CoU (8), Fig. 10
1. Remove
low~er
member of magnet, (see
"Closing Solenoid" under "Replacements",
items 1 to
3).
2. Remove wiririg to coU(8) and remove coU.
3. Remove brass coU guides.
4. Install new coU in reverse order.
PROTECTIVE DEVIC,ES
19
fig. 86 TIllie Delay I.Indervoltage Trlpplnt Device
>----16
~----23
19..
Lucld.DC fiire
2Q'.
AdjulIt!nw Berna
21. lIIount.lol Ie....
22. Trip Paddle
1&
Cl8IIIIP
23.
S'upPOIl'UOI
Bll'adl:et
)L_---.::~~---15
'-----14
14.• Ihpet
15. Coil
16. Berns
1'1. Pm
18. MjulIUq Screw
ADJUSTMENTS, FIG. 16
An
adjusting screw (20) in the trip lever
is
used to allow from 1/32 to 1/16 inch overtravel
after' tripping the breaker.
Adjusting screw (2) is used to adjust the arma-
ture sO that it will pick-up at
80%
of normal voltage
and drop out between 30% and
60%
of normal
voltage.
Adjusting nut
(8)
on connecting rod
(11)
is in-
tended for a minimum amount of adjustment of. the
time delay setting. From 1/4 to 3/8 inch of oU
should be maintained in the cylinder at all tiQ).es.
In order to make an inspection of the oU, the cylinder
Qlay be unscrewed from the cap. G. E. silicone oU
9981LT40NV or simUar grade should be used in the
cylinder.
1!:::::=---22
:--'''--1+---21
~~k==20
_ _ _ _ _ _ _ r1'-_--"'o--Ln..:>.,
f""'
19
"""'--'---18
~~~~-~'17
----r-r-:~S
10·. Cylinder
a.ConnectiOn
Rpd
12.
Pluncer
13. C18l11P
S. Shading
RiiJg
6. Pm
1. Clevis
B. MjulIUitg
Nut .
9.'CIp
A
2
010
020 3
030
4
040
5
010
0 2 0
6
030
7
8
F~i
40-
~-rr==:n--
9
50
-n----'
10 -
'~
__ Lr-
06 0
II
I
B
12
B5~4
13
J
U.V
1. Bracket
2. Adjulltine
Screw
1&
Nut
3. Analore
4. Spring
This device is mounted to a bracket On the
right side of the operating mechanism (looking
from .the front). The purpose of this device is to
trip the breaker for undervoltage. For rated voltag~t
the armature
(3)
is attracted by magnet (14). n
the voltage falls below a predetermined value the
magnet (14) releases the arQlature
(3).
Spring (4)
then pulls armature (3) upward. against the restrain-
ing force of the oil in cylinder
(19);
this action
causes a minimum time delay of 3 seconds.
When
the spring. overcomes the' restraining force of the
oU the armature engages screw (20) thus rotating
the trip shaft and opening the breaker. (For parts
reference refer
to
Fig. 16.) ,
TIME DELAY UNDERVOLTAGE
TRIPPING ,DEVICE