Scientific Development Corporation Minivac 601, Знакомство с устройством, Страница: 17 / 36

EXPERIMENT
0
^ T h is experim ent demonstrates the basic e le c tric a l
operation of a r e la y . Additions to the "manual
| re la y operation" c irc u it of Experiment
6
permit
- I the re la y to be operated e le c t ric a lly
through a pushbutton.
ELECTRICAL RELAY OPERATION
2
)
3 )
4)
The program for connecting the switch
contacts of re la y
1
as shown in
Experiment
6
is: 1+/1H 1 G /1 A
1 J/2 A 2 B /2 -
1 B / 1 -
The program for connecting the co il of
re la y
1
through the norm ally open
contact of pushbutton 1 is: 1+ /1Y
1 X /1 E
Turn power O N . Light 2 comes O N .
1 F /1 -
Press down pushbutton 1 and see the
re la y operate. The re la y makes a " c lic k "
as the coil is e n erg ized , and the re la y contacts
switch the lig h ts. Light 2 goes O F F and
light 1 comes O N . O perate the re la y several times
w ith pushbutton
1
and watch the movement of
the re la y co n tacts.
ght
5 J
N o w , connect the other set of re la y contacts
(1 K , 1 L , I N ) to two unused lights so one lij
comes O N when the re la y is O FF and the
other light comes O N when the re la y is
O N . Try this yo u rself.
£ ^ T o modify this program so that the coil in dicato r
lamp w ill lig h t when the coil of re la y
1
is
energized: remove connection 1)^/1 E
add connection D y l C
The c irc u it for this modified part of the program is:
1 2
1+
iy
—• -
I X
1C
0
I E I F
9
00000
f
I-
The dotted lin e in this c irc u it in dicates that
contacts 1 G , 1 H, and 1J are part of the re la y
switch controlled by the coil connected
between IE and I F .
P LA TE
The re la y is made w ith a small electro-m agnet c o il. When current flows through
the c o il, a magnetic force is produced w hich pulls on the small metal plate attached
to the p lastic crossbar to sw itch the co n tacts. In this experim ent, we have seen the
operation of the electro-m agnet and have operated the re la y to control a set of lig h ts.
We have also seen the re la y in dicato r lamp lig h t when the re la y was turned O N .