Westinghouse KC-4, Инструкция по установке, эксплуатации и обслуживанию

Страница: 16 / 178

"FY P E S SC, SC-1, SV AND SV-1
4
COtHACT$
•
EITHEII
MAn
OR
dii:E.U
AS REQUIRED
IMTEIIIIAl SCitWTIC
ARRAiiiiENEI'IT OF U NITS
TYPE Of UiiiT
SAM£ TYPE
IWT
D
.C
. &
A.C.
LOCATIO.. OF UCII UNIT
IT
UJIIT
o.c.
A.C.
TESTSIIIITCn
TERMINAL
182A857
Fig. 5. Internal Schematic o f the Double Unit Typ e S V or
SV-1 Relay in the Type F T32 Case.
its center section machined off so that the shaft is
exposed at this point and can be prevented from turn­
ing by gripping shaft and bushing with a pair of long­
nose pliers while removing the set screw and nut.
Then by pressing down with the fingers on the upp er
end of the shaft, the lower split sleeve which retains
the lower bearing will be forced out of the threaded
tube , the bearing will drop out freely, and the upper
split sleeve will be forced out far enough to permit
grasping it for removal. The shaft and plunger as­
sembly then can be removed.
The shaft and plunger assembly should be hand­
led carefully to avoid bending the shaft or damaging
the bearing surfaces. The shaft should never be grip­
ped on its upper bearing surface , below the spool­
shaped bushing, when loosening the nut and setscrew,
as this would almost certainly damage the bearing
surface. The shaft bearing surfaces should not be
cleaned or polished with any abrasive material, as
the abrasive p articles might become imbedded in the
shaft and cause difficulty later. The plunger shaft
and bearings may be cleaned by wiping them care­
fully with a clean , lint-less cloth. This may be mois­
tened with benzene or some other cleaning solvent if
necessary. Use no lubricant on the plunger shaft or
bearings when re- ass embling the relay, since this
will eventually become gummy and prevent proper
operation. It is recommended that the shaft be clean-
tGii[lCfS
•
EITIIEI
MAI(E
OR IlEAl AS
IHOUIIfD
IIOJf:
COJLS.
UPI'fD
FDI: l TO 2i IATIO
.....
TOP
L.h.
�·�r
(fiOIT
�
Ia!)
CHASS IS
011£14 JIO
ltiOifllli IWilC..
TESTSI'JTCIII
�CUIIEWT niT"""
183Al93
Fig.
6.
Internal Schematic o f the Three Unit Type SC or
SC-1 R el ay in th e Type F T32 Case.
ed at intervals of approximately two years. When re­
placing the lower bearing and the split sleeves, the
shorter sleeve (assembled below the bearing) should
be pushed in until it is flush with the end of the
threaded tube.
The mounting holes in the operation indicator
screen are slotted so that its position can be adjusted.
For r elays in which the moving contacts are not latch­
ed in the operated position, the screen should be so
located that the indicator positively enters the
screen opening when the contacts barely touch. For
latch-type relays, the screen should be so located
that good contact is still obtained when the relay i s
de- energized. The pressure of t h e screen against the
indicator may be adj usted by bending the screen be­
tween its lower end and the large elongated hole.
This pressure should be such that the indicator will
be held at any further position to which it is moved
after entering the screen opening. However, the mini­
mum amount of pressure necessary to obtain this ad­
j ustment should not be exceeded appreci ably, since
the pick-up value, and consequently the ratio, will
be affected. The purpose of this pressure is to elim­
inate indicator rattle which might otherwise o ccur
under certain energized conditions.
The moving contact l ead s p ass through insulation
sleeves assembled on the shanks of the terminal clips
www
. ElectricalPartManuals
. com