Allis-Chalmers LA-1600, Instruction Book

Page: 96 / 100

•
A
AWS-CI-tALMERS
1401. A I R POT
1402. SOLENOID
140�.
UhiK
1404. TIME DeLAY ADJ USTING SCREW
140� BRACKET
l406. COVER
14 0 '1
ARM
1408. ADJUS T I NG SCRE W
(
,-- ··- --- - ­
,•
I
I
r ·--
L.-------
--
DE TAIL "A"
(SHOWN
FROio!
RIGHT·HANO 510[
OF BRE A K E R )
1409. LOC KNUT
1410. TRIP BAR
14 1 1. PICK·
UP 8
DROP OUT
ADJUSTING SCREW
14 1 2 LOCK NU T
141 �
SPR I NG
1414. T R I P
SHAFT
14 1 � TRIP A R M
14 1 E> P L AT E
FIG. I 4
TYPICAL UNDERVOLTAGE DEVICE
f�ARCH 3, 1967 71- 24·0 - 615-402
Tile undervol tage t r i p
dev i ce automa t i ca l l y t r i ps t h e
b reeker when the
vol tage d rops be f ow
a p r ede t e rm i ned va l ue . E i t h e r i ns tan taneous
or
t i me ­
d
e l a
y
ope ra t i on can be s u pp l i ed .
Adj us t i ng sc rew ( 1408)
s hou l d
be s e t t o
p r ov i de an a i r ga p
of
. 2
5
1 1 be tween
the
s o l eno i d po l e head
and
a rma t u r e
w i th the
dev i ce!
de-ene rg i zed as sho\vn
I n t h e f ro n t v i ew .
A
. 06 1 1 gap
s hou l d be
ma i n t a i ned
be tween
t r i p a rm
(
1
4
1 5 )
and
t
r i
p
ba r ( J I� J O) whe n
the
dev i ce i s
e ne rg i zed w i t h t h e
b reaker c l osed
a s
s h own i n
Oe ta i
1 1 1A1 1 •
P i ck-up
and d r op - o u t adj us t i n g s c rew ( 1 4 1 1 ) s h ou l d
be
s e t s o
t h � t t he
dev i ce p i c k s u p a t a v o l t a ge o f
80% o
r
more o f rated
v
a
l
u e
a nd d rops ou t
be
tween
30%
.:md
60%
o f t h e r a t ed
va I ue .
O n
dcv i ce s
equ i pped
w i t h t i me
de l ay
a i r po t
( 1 40 1 ) , a dj u s t i ng
s c rew ( 1 404)
c a n
be
s e t
to
p rov i de
a
range
o f
t i me de l ay be tween 0 . 5 and 4 . 5 seconds .
T i gh t en i ng
t l1e
s
c
r
e
w
i nc reases
t i me de l ay .