Westinghouse KC-4, Installation, Operation & Maintenance Instructions Manual

Page: 19 / 178

TY P E S SC, SC-1, SV AND SY-1 R E L AYS
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i;
MA Jt ___ _
IiDlA
DRILL
(Z. IIot.CS)
:�tFEFt�o ,'
77-D- 418
Fig.
9.
O utline
&
Drilling P l an for Single Unit Relays in
Small Glass Projection Case.
the latter are 5/3 2 " above the de- energized position.
The moving contact s can be held in this position
while the adj ustment is being made by inserting a
5/3 2 " spacer between the shaft collar and the top of
the core. This dimension should be 3/ 16" on the SV-
1 relay for A-C. Both contacts should touch at the
same time when the plunger is raised. When the plun­
is moved upward against its stop , there should be a
slight deflection of the stationary contact stop springs ,
but this should not exceed 1 / 3 2 ' ' . When the stationary
contacts are reversed so that they are closed when
the relay is de-energized, they should be located so
that they j ust touch the moving contacts when the
latter are 1/32" above the de-energized position. On
some relays it may be found that when the contacts
are used in this position the relay may operate at
values a few p ercent below the scale markings. The
adjustments specified for the stationary contacts are
important. Failure to observe them may cause improper
relay operation, either directly or after a period of
service. Contact position should not be used as a
I.L . 41-766. 1 B
Fig. 10. View o f Type SC Relay Showing Correct Shaping
o f Movin g Con tact L eads.
means of altering the ratio of dropout to pickup.
R E N E W A L P A R T S
Repair work can be done most satisfactorily at the
factory. However, interchangeable p arts can be fur­
nished to the customers who are equipped for doing
repair work . When ordering parts, always give the com­
plete nameplate data.
7
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